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Sample records for tooth extraction

  1. Tooth extraction

    ... this page: //medlineplus.gov/ency/article/007630.htm Tooth extraction To use the sharing features on this page, please enable JavaScript. A tooth extraction is a procedure to remove a tooth from ...

  2. Pneumomediastinum after Tooth Extraction

    Ilhan Ocakcioglu; Serhat Koyuncu; Mustafa Kupeli; Oguzhan Bol

    2016-01-01

    Pneumomediastinum is defined as the presence of air in mediastinum. Pneumomediastinum can sometimes occur after surgery. Pneumomediastinum seen after dental procedures is rare. We presented the case of subcutaneous emphysema developed in the neck and upper chest after tooth extraction and discussed the possible mechanisms of pneumomediastinum.

  3. Autogenous tooth transplantation: an alternative to replace extracted tooth

    David B. Kamadjaja

    2015-09-01

    Full Text Available Background: The gold standard treatment to replace missing tooth is dental implants, however, in certain cases, such as in young patients its placement is contraindicated. Autogenous tooth transplantation, which has been widely done in Scandinavian countries for many years, may become a good alternative to overcome this problem. Purpose: This article attempted to provide information about the indication, treatment planning, surgical technique and the successful result of autogenous tooth transplantation. Case: A fifteen year old male patient presented with large caries and periapical disease of his lower left first molar, which was partially erupted and the roots was not fully formed in radiograph. Case management: Autogenous tooth transplantation procedure was performed consisting of extraction of #36, odontectomy of #38 followed by its implantation to socket #36 and fixation of the transplanted tooth to the adjacent teeth. Post operative evaluation was done on regular basis within 18 months period. There was no complaint, the tooth was clinically stable and no evidence of periodontal problem. Serial radiographs showed healing of alveolar bone and periodontal tissue, and the complete root formation was evident by 18 months post operatively. Conclusion: Autogenous tooth transplantation is a potential alternative to replace extracted tooth. Provided that the case be properly planned and operation carefully performed, successful result of this treatment can be achieved.

  4. Pediatric tooth extractions under sedoanalgesia

    Arpaci, Ayse Hande; Isik, Berrin

    2016-01-01

    Objective: The present study aims to evaluate intravenous ketamine and inhalation sedation in children, their unwanted side-effects and surgeon satisfaction. Methods: In this study, data of 922 children aged between 1-18 who underwent tooth extraction under sedoanalgesia in our department between September 2015-January 2016 were gathered and anesthesia approaches, unwanted side effects and surgical satisfaction was investigated. Postoperative recovery emergence agitation or delirium was evaluated with Watcha Behavior Scale (WBS). Results: Patients were grouped and compared according to acceptance of intravenous line placement (Group-1) or not (Group- 2). Group 1 received intravenous ketamine anesthesia (n=822), Group 2 received inhalation anesthesia with sevoflurane (n=100). Number of patients, age, weight and gender was significantly different in two groups. When side effects were investigated nausea was observed in 30 patients (3.6%), skin rashes were observed in 26 patients (3.2%) in Group-1 while skin rashes were observed in one patient (1%) in Group 2. 95% of surgeons reported intravenous anesthesia, 18% of surgeons reported inhalation anesthesia to be the anesthesia of choice. Emergence of postoperative recovery agitation (WBS≥3) was observed more frequent in Group 2 (p<0.05) than Group 1. Conclusion: Ketamine, which has analgesic, hypnotic and amnestic effects and which does not alter pharyngeal and laryngeal reflexes thus minimizes aspiration possibility, is a safe and effective anesthetic agent for tooth extractions of the pediatric population under sedoanalgesia. PMID:27882039

  5. Analysis of split tooth as an unstudied reason for tooth extraction

    Osaghae, Ifueko Patience; Azodo, Clement Chinedu

    2014-01-01

    Background Split tooth is an unstudied reason for tooth extraction. The purpose of this study was to determine and analyze split tooth as a reason for extraction in a dental clinic in Benin City. Methods The prospective study was carried out on 669 patients having tooth extraction between May, 2005 and December, 2012. Over the period of the study, diagnosis and tooth extraction were done by three dentists of more five years practice experience. The indications for tooth extraction were noted ...

  6. Iatrogenic traumatic brain injury during tooth extraction.

    Troxel, Mark

    2015-01-01

    An 8 yr old spayed female Yorkshire terrier was referred for evaluation of progressive neurological signs after a routine dental prophylaxis with tooth extractions. The patient was circling to the left and blind in the right eye with right hemiparesis. Neurolocalization was to the left forebrain. MRI revealed a linear tract extending from the caudal oropharynx, through the left retrobulbar space and frontal lobe, into the left parietal lobe. A small skull fracture was identified in the frontal bone through which the linear tract passed. Those findings were consistent with iatrogenic trauma from slippage of a dental elevator during extraction of tooth 210. The dog was treated empirically with clindamycin. The patient regained most of its normal neurological function within the first 4 mo after the initial injury. Although still not normal, the dog has a good quality of life. Traumatic brain injury is a rarely reported complication of extraction. Care must be taken while performing dental cleaning and tooth extraction, especially of the maxillary premolar and molar teeth to avoid iatrogenic damage to surrounding structures.

  7. Massive clot formation after tooth extraction

    Santosh Hunasgi

    2015-01-01

    Full Text Available Oral surgical procedures mainly tooth extraction can be related with an extended hemorrhage owed to the nature of the process resulting in an "open wound." The attempt of this paper is to present a case of massive postoperative clot formation after tooth extraction and highlight on the oral complications of surgical procedures. A 32-year-old male patient reported to the Dental Clinic for evaluation and extraction of grossly decayed 46. Clinical evaluation of 46 revealed root stumps. Extraction of the root stumps was performed, and it was uneventful. Hemostasis was achieved and postsurgical instructions were specified to the patient. The patient reported to the clinic, the very subsequent morning with a criticism of bleeding at the extraction site. On clinical examination, bleeding was noted from the socket in relation to 46. To control bleeding, oral hemostatic drugs Revici - E (Ethamsylate 500 mg was prescribed and bleeding was stopped in 2 h. However, a massive clot was formed at the extraction site. Further, this clot resolved on its own in 1-week time. Despite the fact that dental extraction is considered to be a minor surgical procedure, some cases may present with life-threatening complications including hemorrhage. Vigilant and significant history taking, physical and dental examinations prior to dental procedures are a must to avoid intraoperative and postoperative complications.

  8. Sonosurgery for atraumatic tooth extraction: a clinical report.

    Papadimitriou, Dimitrios E V; Geminiani, Alessandro; Zahavi, Thomas; Ercoli, Carlo

    2012-12-01

    The preservation of an intact labial plate during tooth extraction is a critical determinant of whether an immediate implant can be placed and is also an important predictor of the esthetic result. The purpose of this clinical report was to present a method for atraumatic tooth extraction by using an air-driven sonic instrument with specially designed inserts. This surgical technique provides the clinician with an efficient method for atraumatic tooth extraction and preservation of an intact labial plate.

  9. Effect of soybean extract after tooth extraction on osteoblast numbers

    Rosa Sharon Suhono

    2011-06-01

    Full Text Available Background: Many researches were done to find natural materials that may increase and promote bone healing processes after trauma and surgery. One of natural material that had been studied was soybean extract which contains phytoestrogen, a non-steroidal compounds found in plants that may binds to estrogen receptors and have estrogen-like activity. Purpose: The aim of this study was to investigate the effect of soybean extract feeding on the number of osteoblast cells in alveolar bone socket after mandibular tooth extraction. Methods: This study was studied on male Rattus norvegicus strain Wistar. Seventeen rats divided into three groups were used in this study. Group 1 fed with carboxy methyl cellulose (CMC solution 0,2% for seven days, and the left mandibular central incisivus was extracted; group 2 fed with soybean extract for seven days and the left mandibular central incisives was extracted; group 3 received the left mandibular central incisives extraction followed by soybean extract feeding for seven days after the extraction. All groups were sacrificed on the seventh day post-extraction, and the alveolar bone sockets were taken for histopathological observation. The tissues were processed and stained using hematoxylin and eosin to identify the amount of osteoblast cells. The number of osteoblast cells was counted using an Image Tool program. The data was analyzed statistically using the One-Way ANOVA test. Results: Significant differences were found on the number of osteoblast cells in alveolar bone after tooth extraction between groups. Group 2 (fed with soybean extract is higher than group 1 (fed with CMC and group 3 (fed with soybean extract after extraction. Conclusion: Soybean extract feeding that given for seven days pre-tooth extraction can increase the number of osteoblast cells compared with the group that were not given soybean extract feeding and also with the group that were given soybean extract feeding for seven days post-tooth

  10. Complications associated with cheek tooth extraction in the horse.

    Earley, Edward T; Rawlinson, Jennifer E; Baratt, Robert M

    2013-01-01

    Common indications for cheek tooth extraction in the horse include dental fracture, periodontal disease, severe decay/ caries, mandibular fracture with alveolar/tooth involvement, and periapical abscess. Complications secondary to extraction of cheek teeth are prevalent. Typical complications may include retained root tip(s), collateral damage of neighboring teeth and alveolar bone, mandibular fracture non-union or delayed union, cemental ankylosis, dilacerated root(s), oroantral/oronasal fistula, palatal deviation of cheek teeth, bone sequestration, sinus involvement, alveolar plug failure, and palatine artery laceration. This paper presents a series of cases that had complications following cheek tooth extraction. Anticipation of problematic extractions, recognition of complications, and appropriate treatment will aid the clinician in managing the inevitable cheek tooth extraction complication.

  11. Tooth extraction education at dental schools across Europe

    Brand, H.S.; van der Cammen, C.C.J.; Roorda, S.M.E.; Baart, J.A.

    2015-01-01

    Objectives/Aims: To explore students’ opinion about theoretical and clinical training in tooth extraction at different European dental schools. Materials and Methods: An online questionnaire, containing 36 dichotomous, multiple choice and Likert scale rating questions, was distributed among students

  12. Pain fiber anesthetic reduces brainstem Fos after tooth extraction.

    Badral, B; Davies, A J; Kim, Y H; Ahn, J S; Hong, S D; Chung, G; Kim, J S; Oh, S B

    2013-11-01

    We recently demonstrated that pain-sensing neurons in the trigeminal system can be selectively anesthetized by co-application of QX-314 with the TRPV1 receptor agonist, capsaicin (QX cocktail). Here we examined whether this new anesthetic strategy can block the neuronal changes in the brainstem following molar tooth extraction in the rat. Adult male Sprague-Dawley rats received infiltration injection of anesthetic 10 min prior to lower molar tooth extraction. Neuronal activation was determined by immunohistochemistry for the proto-oncogene protein c-Fos in transverse sections of the trigeminal subnucleus caudalis (Sp5C). After tooth extraction, c-Fos-like immunoreactivity (Fos-LI) detected in the dorsomedial region of bilateral Sp5C was highest at 2 hrs (p tooth extraction; reduced Fos-LI was also observed with the conventional local anesthetic lidocaine. Pulpal anesthesia by infiltration injection was confirmed by inhibition of the jaw-opening reflex in response to electrical tooth pulp stimulation. Our results suggest that the QX cocktail anesthetic is effective in reducing neuronal activation following tooth extraction. Thus, a selective pain fiber 'nociceptive anesthetic' strategy may provide an effective local anesthetic option for dental patients in the clinic.

  13. Computer-Assisted Technique for Surgical Tooth Extraction.

    Hamza, Hosamuddin

    2016-01-01

    Introduction. Surgical tooth extraction is a common procedure in dentistry. However, numerous extraction cases show a high level of difficulty in practice. This difficulty is usually related to inadequate visualization, improper instrumentation, or other factors related to the targeted tooth (e.g., ankyloses or presence of bony undercut). Methods. In this work, the author presents a new technique for surgical tooth extraction based on 3D imaging, computer planning, and a new concept of computer-assisted manufacturing. Results. The outcome of this work is a surgical guide made by 3D printing of plastics and CNC of metals (hybrid outcome). In addition, the conventional surgical cutting tools (surgical burs) are modified with a number of stoppers adjusted to avoid any excessive drilling that could harm bone or other vital structures. Conclusion. The present outcome could provide a minimally invasive technique to overcome the routine complications facing dental surgeons in surgical extraction procedures.

  14. Computer-Assisted Technique for Surgical Tooth Extraction

    Hosamuddin Hamza

    2016-01-01

    Full Text Available Introduction. Surgical tooth extraction is a common procedure in dentistry. However, numerous extraction cases show a high level of difficulty in practice. This difficulty is usually related to inadequate visualization, improper instrumentation, or other factors related to the targeted tooth (e.g., ankyloses or presence of bony undercut. Methods. In this work, the author presents a new technique for surgical tooth extraction based on 3D imaging, computer planning, and a new concept of computer-assisted manufacturing. Results. The outcome of this work is a surgical guide made by 3D printing of plastics and CNC of metals (hybrid outcome. In addition, the conventional surgical cutting tools (surgical burs are modified with a number of stoppers adjusted to avoid any excessive drilling that could harm bone or other vital structures. Conclusion. The present outcome could provide a minimally invasive technique to overcome the routine complications facing dental surgeons in surgical extraction procedures.

  15. Alveolar process reconstruction after tooth extraction by orthodontic indications

    Kovalev М.О.

    2013-09-01

    Full Text Available The objective of the study is to determine indications for alveolar bone reconstruction after tooth extraction according to orthodontic indications. Material and methods. 62 patients (first maturity level with dental arch asymmetry due to loss of a premolar on one side of the mouth were examined and treated. Frontal-diagonal coefficient of the dental arch was used to determine the correlation between tooth size and dental arch parameters. Results. It has been demonstrated that changes of the alveolar ridge following the extraction of the first premolars in patients of the experimental group were less significant as compared with the controls. Conclusion. It is reasonable to apply this method simultaneously with the removal of a tooth for orthodontic indications or when the alveolar ridge in the post-extraction socket leaves insufficient bone volume.

  16. Intra-oral PTH administration promotes tooth extraction socket healing.

    Kuroshima, S; Kovacic, B L; Kozloff, K M; McCauley, L K; Yamashita, J

    2013-06-01

    Intermittent parathyroid hormone (PTH) administration increases systemic and craniofacial bone mass. However, the effect of PTH therapy on healing of tooth extraction sites is unknown. The aims of this study were to determine the effect of PTH therapy on tooth extraction socket healing and to examine whether PTH intra-oral injection promotes healing. The mandibular first molars were extracted in rats, and subcutaneous PTH was administered intermittently for 7, 14, and 28 days. In a second study, maxillary second molars were extracted, and PTH was administered by either subcutaneous or intra-oral injection to determine the efficacy of intra-oral PTH administration. Healing was assessed by micro-computed tomography and histomorphometric analyses. PTH therapy accelerated the entire healing process and promoted both hard- and soft-tissue healing by increasing bone fill and connective tissue maturation. PTH therapy by intra-oral injection was as effective as subcutaneous injection in promoting tooth extraction socket healing. The findings suggest that PTH therapy promotes tooth extraction socket healing and that intra-oral injections can be used to administer PTH.

  17. [Guided tooth eruption via serial extraction].

    Luyten, C

    1995-01-01

    Crowding of teeth is the result of arch length discrepancy (ALD). Minimal crowding can be solved with slice-technique, more severe crowding (ALD > or = 5 mm) can be intercepted with a serial extraction procedure. In this paper a sequence of serial extraction will be explained and illustrated with case reports.

  18. The annual frequency of root fillings, tooth extractions and pulp-related procedures in Danish adults during 1977-2003

    Bjørndal, L.; Reit, C.

    2004-01-01

    endodontic epidemiology, frequency of root fillings, pulp capping, stepwise excavation, tooth extractions......endodontic epidemiology, frequency of root fillings, pulp capping, stepwise excavation, tooth extractions...

  19. Osseointegrated fixture placement with simultaneous tooth extraction.

    Schabes, G A; Sacks, H G; Kaufman, P S

    1992-03-01

    Three cases are presented that illustrate the potential for accelerating the healing phase with fixture-based treatment. Depending on the clinical circumstances, techniques may include radical alveolectomy, the use of fresh extraction sockets, and fixture placement in inter-radicular bone.

  20. Peptide-induced de novo bone formation after tooth extraction prevents alveolar bone loss in a murine tooth extraction model.

    Arai, Yuki; Aoki, Kazuhiro; Shimizu, Yasuhiro; Tabata, Yasuhiko; Ono, Takashi; Murali, Ramachandran; Mise-Omata, Setsuko; Wakabayashi, Noriyuki

    2016-07-05

    Tooth extraction causes bone resorption of the alveolar bone volume. Although recombinant human bone morphogenetic protein 2 (rhBMP-2) markedly promotes de novo bone formation after tooth extraction, the application of high-dose rhBMP-2 may induce side effects, such as swelling, seroma, and an increased cancer risk. Therefore, reduction of the necessary dose of rhBMP-2 which can still obtain sufficient bone mass is necessary by developing a new osteogenic reagent. Recently, we showed that the systemic administration of OP3-4 peptide, which was originally designed as a bone resorption inhibitor, had osteogenic ability both in vitro and in vivo. This study evaluated the ability of the local application of OP3-4 peptide to promote bone formation in a murine tooth extraction model with a very low-dose of BMP. The mandibular incisor was extracted from 10-week-old C57BL6/J male mice and a gelatin hydrogel containing rhBMP-2 with or without OP3-4 peptide (BMP/OP3-4) was applied to the socket of the incisor. Bone formation inside the socket was examined radiologically and histologically at 21 days after the extraction. The BMP/OP3-4-group showed significant bone formation inside the mandibular extraction socket compared to the gelatin-hydrogel-carrier-control group or rhBMP-2-applied group. The BMP/OP3-4-applied mice showed a lower reduction of alveolar bone and fewer osteoclast numbers, suggesting that the newly formed bone inside the socket may prevent resorption of the cortical bone around the extraction socket. Our data revealed that OP3-4 peptide promotes BMP-mediated bone formation inside the extraction socket of mandibular bone, resulting in preservation from the loss of alveolar bone.

  1. Pressure pain threshold of mucosa after tooth extraction under removable denture bases.

    Suzuki, Y; Katoh, M; Sato, J; Morokuma, M; Hosoi, M A; Ohkubo, C

    2011-12-01

    This study explored the pressure pain threshold (PPT) of the mucosa after tooth extraction. The PPTs of the wounded mucosa of eight volunteer subjects were observed at 7, 30, and 90 days after tooth extraction. The PPTs at 30 days and 90 days were approximately two and three times higher respectively, than those at 7 days. As time passed, the values for the PPTs after tooth extraction increased in all regions. At 90 days after tooth extraction, the PPTs are about 97% recovered compared to the PPTs of the contralateral points.

  2. Iatrogenic nasolacrimal duct obstruction following tooth extraction in a cat.

    Paiva, Sávia Calline C S; Froes, Tilde R; Lange, Rogério Ribas; Machado, Marcello; Pachaly, José Ricardo; Montiani-Ferreira, Fabiano

    2013-01-01

    A 10-year-old DSH cat was referred for a dental evaluation and extraction procedure. Subsequently, the animal developed an acute onset of ocular discharge. Ophthalmologic examination revealed presence of unilateral ocular mucoid discharge leading to a diagnosis of epiphora secondary to nasolacrimal duct obstruction. Dacryocystorhinography was performed and confirmed the presence of a nasolacrimal duct obstruction, presumably acquired after an invasive dental procedure. Additionally, a vinyl cast in situ study of the nasolacrymal apparatus was performed to demonstrate the route of the nasolacrimal duct in the cat and its relationship to oral dental structures. This report documents an unusual case in which excessive inflammation/edema following tooth extraction caused acute epiphora secondary to extraluminal compression of the distal nasolacrimal duct.

  3. [Application of micro-power system in the surgery of tooth extraction].

    Kaijin, Hu; Yongfeng, Li

    2015-02-01

    Tooth extraction is a common operation in oral surgery. Traditional-extraction instruments, such as bone chisel, elevator, and bone hammer, lead to not only severe trauma but also unnecessary complications, and patients easily become nervous and apprehensive if tooth extraction is performed using these violent instruments. In recent years, with the develop- ment of minimally invasive concept and technology, various micro-power instruments have been used for tooth extraction. This innovative technology can reduce the iatrogenic trauma and complications of tooth extraction. Additionally, this technology can greatly decrease the patient's physical and mental pressure. The new equipment compensates for the deficiency of traditional tooth extraction equipment and facilitates the gradual replacement of the latter. Diverse micro-power systems have distinct strengths and weaknesses, so some auxiliary instruments are still needed during tooth extraction. This paper focuses on the various micro-power systems for tooth extraction and tries to compare the advantages and disadvantages of these systems. Selection and usage of auxiliary equipment are also introduced. Thus, this paper provides reference for the proper application of the micro-power systems in tooth extraction.

  4. A 15-Year Time-series Study of Tooth Extraction in Brazil.

    Cunha, Maria Aparecida Goncalves de Melo; Lino, Patrícia Azevedo; Santos, Thiago Rezende Dos; Vasconcelos, Mara; Lucas, Simone Dutra; Abreu, Mauro Henrique Nogueira Guimarães de

    2015-11-01

    Tooth loss is considered to be a public health problem. Time-series studies that assess the influence of social conditions and access to health services on tooth loss are scarce.This study aimed to examine the time-series of permanent tooth extraction in Brazil between 1998 and 2012 and to compare these series in municipalities with different Human Development Index (HDI) scores and with different access to distinct primary and secondary care.The time-series study was performed between 1998 and 2012, using data from the Brazilian National Health Information System. Time-series study was performed between 1998 and 2012. Two annual rates of tooth extraction were calculated and evaluated separately according to 3 parameters: the HDI, the presence of a Dental Specialty Center, and coverage by Oral Health Teams. The time-series was analyzed using a linear regression model.An overall decrease in the tooth-loss tendencies during this period was observed, particularly in the tooth-extraction rate during primary care procedures. In the municipalities with an HDI that was lower than the median, the average tooth-loss rates were higher than in the municipalities with a higher HDI. The municipalities with lower rates of Oral Health Team coverage also showed lower extraction rates than the municipalities with higher coverage rates.In general, Brazil has shown a decrease in the trend to extract permanent teeth during these 15 years. Increased human development and access to dental services have influenced tooth-extraction rates.

  5. A case of recurrent neuro-Behçet's disease after tooth extraction.

    Choi, Seong-Min; Choi, Yun-Ju; Kim, Joon-Tae; Lee, Seung-Han; Park, Man-Seok; Kim, Byeong-Chae; Kim, Myeong-Kyu; Cho, Ki-Hyun

    2010-01-01

    We report a 39-yr-old man with neuro-Behçet's disease (NBD) in remission who developed left-sided ataxia with a sensory deficit about 10 days after tooth extraction. Several years ago, he experienced a similar episode of relapse after tooth extraction. Brain magnetic resonance imaging showed a newly developed right thalamic lesion. In cerebrospinal fluid, lymphocyte-dominant pleocytosis and mild elevation of IgG were found. Immunologic factors may be important in the pathogenesis of NBD because of the time delay between tooth extraction and relapse. Careful observation and prevention are needed before dental procedures in patients with NBD.

  6. Tooth extraction by orthodontic force after radiation therapy: report of case

    Rodu, B.; Filler, S.J.; Woodfin, G.K.

    1985-12-01

    This report presents a therapeutic approach to orthodontic tooth extraction in a patient at high risk for the development of osteoradionecrosis with conventional techniques. The rationale for this procedure is discussed in detail, combining principles of radiation biology, clinical radiation therapy, and biomechanics of tooth movement.

  7. Outcome of premolar extractions on Bolton's overall ratio and tooth size discrepancies in South India

    Varghese, Shaji T.; Yerasi, Purushothama R.; Jose, Lijo K.; Mohammed Haris, T. P.; Mathew, Tom; Ealla, Kranti K. R.

    2016-01-01

    Aims and Objectives: Attainment of ideal occlusion is often restricted by disproportionate sizes of individual teeth, which is otherwise termed as tooth size discrepancy (TSD). While extraction of teeth for orthodontic purposes is not uncommon, there is considerable resistance against this school of thought. The extraction of premolars, in particular, received considerable attention because of the potential TSD that could result following the extraction of premolars. The aim of the present study was to identify the consequence of premolar extractions on Bolton's overall ratios in South Indian population. Materials and Methods: One hundred participants were recruited into the study through purposive nonproportionate quota sampling. Pretreatment dental casts of the study participants were measured for mesiodistal tooth widths to determine Bolton's overall ratio before the hypothetical tooth extractions were performed. The hypothetical extractions were executed in four different combinations as follows: (a) Maxillary and mandibular first premolars, (b) maxillary first premolars and mandibular second premolars, (c) maxillary second premolars and mandibular first premolars, and (d) maxillary and mandibular second premolars. Bolton's overall ratios were calculated after the hypothetical tooth extractions were performed. Statistical analysis was done using the Statistical Package for the Social Sciences, version 20 software. Results: It was observed that extractions performed in any of the combinations followed in this study resulted in a decrease of overall Bolton's ratios. However, the discrepancy in tooth size was highest with the extraction of all first premolars, whereas least discrepancy was recorded with all second premolars extraction. It was also found that, based on the combination of teeth chosen for extraction, there was significant difference in Bolton's overall ratios between males and females. Conclusion: In formulating a treatment plan involving premolar

  8. Effect of serial extraction alone on crowding: relationships between tooth width, arch length, and crowding.

    Yoshihara, T; Matsumoto, Y; Suzuki, J; Sato, N; Oguchi, H

    1999-12-01

    In this study, we examined the effect of serial extraction alone on crowding. We also investigated the relationships between tooth width, arch length, and irregularity index. Maxillary dental casts from 32 subjects who had undergone only serial extraction were analyzed at 3 stages: before deciduous canines extraction, after first premolars extraction, and at the end of the observation period. The mean of the irregularity index decreased significantly as serial extraction proceeded and further decreased during the observation period. In cases where the width of the incisor was more than 2 standard deviations above the means for the control subjects, there was a significant correlation between tooth width of the lateral incisors and irregularity index before extraction as well as a significant correlation between the summation of tooth widths of the central and lateral incisors and irregularity index at that time. There was a significant negative correlation between arch length discrepancy and irregularity index before extraction and also a significant correlation between arch length discrepancy and correction of the irregularity index from before deciduous canines extraction to after first premolars extraction. These results suggest that tooth width and arch length discrepancy might preferentially affect the degree of anterior crowding in cases of severe crowding. There was no aggravation of the average crowding level during the observation period in the present study. The present study quantitatively suggested that serial extraction was useful for the purpose of correcting crowding in most cases.

  9. Osteopathic manipulative treatment to resolve head and neck pain after tooth extraction.

    Meyer, Patricia M; Gustowski, Sharon M

    2012-07-01

    Pain is a common occurrence after tooth extraction and is usually localized to the extraction site. However, clinical experience shows that patients may also have pain in the head or neck in the weeks after this procedure. The authors present a case representative of these findings. In the case, cranial and cervical somatic dysfunction in a patient who had undergone tooth extraction was resolved through the use of osteopathic manipulative treatment. This case emphasizes the need to include a dental history when evaluating head and neck pain as part of comprehensive osteopathic medical care. The case can also serve as a foundation for a detailed discussion regarding how to effectively incorporate osteopathic manipulative treatment into primary care practice for patients who present with head or neck pain after tooth extraction.

  10. Impact of Ellagic Acid in Bone Formation after Tooth Extraction: An Experimental Study on Diabetic Rats

    Mazen M. Jamil Al-Obaidi

    2014-01-01

    Full Text Available Objectives. To estimate the impact of ellagic acid (EA towards healing tooth socket in diabetic animals, after tooth extraction. Methods. Twenty-four Sprague Dawley male rats weighing 250–300 g were selected for this study. All animals were intraperitoneally injected with 45 mg/kg (b.w. of freshly prepared streptozotocin (STZ, to induce diabetic mellitus. Then, the animals were anesthetized, and the upper left central incisor was extracted and the whole extracted sockets were filled with Rosuvastatin (RSV. The rats were separated into three groups, comprising 8 rats each. The first group was considered as normal control group and orally treated with normal saline. The second group was regarded as diabetic control group and orally treated with normal saline, whereas the third group comprised diabetic rats, administrated with EA (50 mg/kg orally. The maxilla tissue stained by eosin and hematoxylin (H&E was used for histological examinations and immunohistochemical technique. Fibroblast growth factor (FGF-2 and alkaline phosphatase (ALP were used to evaluate the healing process in the extracted tooth socket by immunohistochemistry test. Results. The reactions of immunohistochemistry for FGF-2 and ALP presented stronger expression, predominantly in EA treated diabetic rat, than the untreated diabetic rat. Conclusion. These findings suggest that the administration of EA combined with RSV may have accelerated the healing process of the tooth socket of diabetic rats, after tooth extraction.

  11. Evaluation of success rates of immediate and delayed implants after tooth extraction

    Baris Simsek; Sebnem Simsek

    2003-01-01

    Objective To evaluate the success rates of immediate and delayed placement of implants with respect to the causes of tooth extraction and implant positions. Methods A total of 310 dental implants (immediate implants∶ delayed implants=76∶ 234) were inserted into 80 patients. The types, sizes and positions of the implants and the causes of tooth extraction were recorded. We then investigated the relationship of implant loss with the causes of tooth extraction and placement methods. Results A higher failure rate was found for the implants in the posterior region of the maxilla, and when periodontitis was cited as a reason for tooth extraction. The overall success rates were 93.4% and 95.7% in the immediate and delayed implant placement groups, respectively, after a 2-year follow-up. No obvious relationship of success rate was observed with the implant placement method, cause of tooth extaction, and implants' position. Conclusion The immediate placement of implants into fresh extraction sockets could offer advantages over the delayed implant placement. It seems to be a safe and predictable method for patients.

  12. Evaluation of extraction sites for evidence of retained tooth roots and periapical pathology.

    Moore, James I; Niemiec, Brook

    2014-01-01

    The objective of this retrospective clinical study was to determine the frequency and pathogenicity of unintentional retained tooth root fragments after extraction of the maxillary fourth premolar (108 and 208) and mandibular first molar teeth (309 and 409) in 74 canine and 42 feline client-owned patients. Radiographs of client-owned animals with historical evidence of extraction of teeth 309 and 409 were reviewed. All patients had dental extraction(s) for clinical reasons, and all extractions were deemed successful by the practitioners. Extraction sites were radiographed to identify tooth root fragments and pathology. Twenty-five canine and 25 feline patients that had extractions utilizing preoperative and postoperative radiography were also included. Sixty-one of 74 canine patients (82.4%; P retained tooth root fragments. In total, 100 of 116 cases (86.4%; P retained tooth root fragments, and periapical pathology was found in 66 of 116 (56.8%; P = 0.000000743) radiographs, including 39 of 74 canine cases (52.7%; P = 0.00002765) and 27 of 42 feline cases (64.3%; P = 0.01589). The control group had no evidence of retained root fragments. Further veterinary dental training and routine use of pre- and postoperative dental radiology are recommended.

  13. A Case of Simultaneous Ectopic Tooth Extraction and Removal of Migrated Dental Implant from Maxillary Sinus.

    Furuya, Yoshitaka; Norizuki, Yoshie; Yajima, Yasutomo

    2015-01-01

    When a dental implant migrates to the maxillary sinus it should be extracted immediately as it may cause sinusitis or further migrate to one of the other paranasal sinuses. Although usually detected due to symptoms such as nasal obstruction, nasal discharge, and nasal bleeding, an ectopic tooth in the maxillary sinus can sometimes be revealed incidentally on radiographic examination. Here, we report a case of simultaneous extraction of a dental implant that had migrated to the maxillary sinus and removal of an ectopic tooth that had arisen in the same location. The patient was a 73-year-old man who had received the implant to replace the first left maxillary molar at a local dental office. The implant had subsequently migrated to the left maxillary sinus and the patient was referred to us for its removal. On locating the implant on a CT scan at our hospital, an ectopic tooth was also observed at the base of the maxillary sinus. With patient consent, the decision was made to remove the ectopic tooth and extract the implant simultaneously. Excision of the lateral wall of the maxillary sinus allowed easy extraction of the implant. The ectopic tooth was removed by slightly expanding a fenestration in the sinus wall. Ectopic teeth in the maxillary sinus are sometimes put on follow-up if asymptomatic. Removal should be considered, however, if there is a risk of it becoming infected due to implantation-induced inflammation.

  14. Forensic interpretation of the maxillary tuberosity fracture caused by tooth extraction

    Puzović Dragana

    2010-01-01

    Full Text Available Background. Maxillary tuberosity during teeth extraction can occur in dental practice. The aim of this paper was to present a case of the maxillary tuberosity fracture occurred during tooth extraction, which was the subject of the forensic expertise. Case report. The maxillary tuberosity fracture created during the extraction of the upper molar was neither timely nor adequately managed by the doctor who started extraction. After the treatment at the specialist institution, the patient sued the doctor for the criminal offense of negligent treatment. The task of the expert was to give a professional answer to the question whether the doctor, who caused a maxillary tuberosity fracture during the tooth extraction, acted negligently and applied inadequate treatment. Conclusion. The maxillary tuberosity fracture during molar extraction may be its complication. If it is diagnosed promptly, immediately and adequately managed, there is no possibility for negligence action.

  15. Application of coenzyme Q10 for accelerating soft tissue wound healing after tooth extraction in rats.

    Yoneda, Toshiki; Tomofuji, Takaaki; Kawabata, Yuya; Ekuni, Daisuke; Azuma, Tetsuji; Kataoka, Kota; Kunitomo, Muneyoshi; Morita, Manabu

    2014-12-10

    Accelerating wound healing after tooth extraction is beneficial in dental treatment. Application of antioxidants, such as reduced coenzyme Q10 (rCoQ10), may promote wound healing after tooth extraction. In this study, we examined the effects of topical application of rCoQ10 on wound healing after tooth extraction in rats. After maxillary first molars were extracted, male Fischer 344 rats (8 weeks old) (n = 27) received topical application of ointment containing 5% rCoQ10 (experimental group) or control ointment (control group) to the sockets for 3 or 8 days (n = 6-7/group). At 3 days after extraction, the experimental group showed higher collagen density and lower numbers of polymorphonuclear leukocytes in the upper part of socket, as compared to the control group (p tooth extraction, there were no significant differences in collagen density, number of polymorphonuclear leukocytes and bone fill between the groups. Our results suggest that topical application of rCoQ10 promotes wound healing in the soft tissue of the alveolar socket, but that rCoQ10 has a limited effect on bone remodeling in rats.

  16. Application of Coenzyme Q10 for Accelerating Soft Tissue Wound Healing after Tooth Extraction in Rats

    Toshiki Yoneda

    2014-12-01

    Full Text Available Accelerating wound healing after tooth extraction is beneficial in dental treatment. Application of antioxidants, such as reduced coenzyme Q10 (rCoQ10, may promote wound healing after tooth extraction. In this study, we examined the effects of topical application of rCoQ10 on wound healing after tooth extraction in rats. After maxillary first molars were extracted, male Fischer 344 rats (8 weeks old (n = 27 received topical application of ointment containing 5% rCoQ10 (experimental group or control ointment (control group to the sockets for 3 or 8 days (n = 6–7/group. At 3 days after extraction, the experimental group showed higher collagen density and lower numbers of polymorphonuclear leukocytes in the upper part of socket, as compared to the control group (p < 0.05. Gene expression of interleukin-1β, tumor necrosis factor-α and nuclear factor-κB were also lower in the experimental group than in the control group (p < 0.05. At 8 days after tooth extraction, there were no significant differences in collagen density, number of polymorphonuclear leukocytes and bone fill between the groups. Our results suggest that topical application of rCoQ10 promotes wound healing in the soft tissue of the alveolar socket, but that rCoQ10 has a limited effect on bone remodeling in rats.

  17. Can tert-butylhydroquinone improve the healing of extracted tooth socket in rats?

    Tusi, Somayeh Khoramian; Manesh, Tahereh Eslam; Fathollahi, Mahmood Sheikh; Bagherian, Ali

    2017-01-01

    Background: Tooth extraction causes an open wound in the soft and hard tissues. During the inflammatory phase of the healing process, a large amount of free radicals are produced and cause oxidative stress, which leads to tissue damage and delayed wound healing. Thus, in this study, we evaluated the effect of tert-butylhydroquinone (TBHQ), as an antioxidant, on the healing process of tooth sockets in rats. Materials and Methods: To conduct this experimental study, male Wistar rats (n = 42) were divided into two groups. In each case, one upper second molar was extracted under general anesthesia. After the extraction, the tooth sockets of the experimental group were treated with a 0.02% TBHQ solution (0.1 ml) while the same volume of distilled water placed in the sockets of the control group. On days 3, 7, and 21 postoperatively, 7 rats from each group were euthanized, and histological slides were prepared from their tooth sockets. The prepared slides were examined histopathologically using a light microscope and compared using an independent two-sample t-test. The significance level was set at 0.05. Results: In the experimental group, a statistically significant (P = 0.003) increase in granulation tissue was observed on day 3, in comparison to the control group. The extent of bony trabeculation was also significantly higher in the TBHQ-treated group than in the control group on day 21 (P healing of the hard tissue in the tooth sockets.

  18. Immediate fixed partial denture after tooth extraction in patients with systemic diseases: A clinical report

    Kang, Hyun Sun; Lee, Su Young

    2016-01-01

    For patients with systemic diseases who face difficulties visiting dental clinics, wearing fixed partial denture in the anterior region on the same day of tooth extraction can reduce the total period of treatment and the number of visits, as well as post-treatment psychological effect on the patient.

  19. Immediate fixed partial denture after tooth extraction in patients with systemic diseases: A clinical report.

    Kang, Hyun Sun; Lee, Su Young

    2016-12-01

    For patients with systemic diseases who face difficulties visiting dental clinics, wearing fixed partial denture in the anterior region on the same day of tooth extraction can reduce the total period of treatment and the number of visits, as well as post-treatment psychological effect on the patient.

  20. Changes in oral microflora after full-mouth tooth extraction : A prospective cohort study

    de Waal, Yvonne C M; Winkel, Edwin G; Raangs, Gerwin C; van der Vusse, Marleen L; Rossen, John W A; van Winkelhoff, Arie Jan

    2014-01-01

    AIM: The aim of the study was to evaluate the effect of full-mouth tooth extraction on the oral microflora, with emphasis on the presence and load of Aggregatibacter actinomycetemcomitans and Porphyromonas gingivalis. MATERIAL AND METHODS: Adult patients (n = 30), with moderate to advanced periodont

  1. Immediate fixed partial denture after tooth extraction in patients with systemic diseases: A clinical report

    2016-01-01

    For patients with systemic diseases who face difficulties visiting dental clinics, wearing fixed partial denture in the anterior region on the same day of tooth extraction can reduce the total period of treatment and the number of visits, as well as post-treatment psychological effect on the patient. PMID:28018570

  2. On the use of prothrombin complex concentrate in patients with coagulopathy requiring tooth extraction.

    Morimoto, Yoshinari; Niwa, Hitoshi; Nakatani, Takeshi

    2010-12-01

    In patients on high-level anticoagulant therapy (prothrombin time-international normalized ratio [PT-INR] ≥ 4.5), surgical procedures can be carried out with bridging therapy using heparin. However, surgical treatment options are severely limited in patients on high-level anticoagulant therapy and who have heparin-induced thrombocytopenia (HIT), as heparin use is contraindicated. We performed tooth extraction using prothrombin complex concentrate (PCC) in 2 HIT patients on high-level anticoagulation therapy (PT-INR ≥ 4.5). Five hundred units of PCC were administered intravenously, and after 15 minutes, it was confirmed that PT-INR was less than 2.0. Tooth extraction was then performed and sufficient local hemostasis was achieved. At 3 hours after tooth extraction, PT-INR was 2.0 or higher and later increased to 4.0 or higher, but postoperative bleeding was mostly absent. When performing tooth extraction in HIT patients on high-level anticoagulant therapy, favorable hemostatic management was achieved through sufficient local hemostasis and transient warfarin reversal using PCC.

  3. Effectivity of Betel Leaf (Piper betle L. Gel Extract in Shortening Bleeding Time After Deciduous Tooth Extraction

    Regina Tedjasulaksana

    2017-01-01

    Full Text Available Background: As an Indonesian traditional medicine, betel leafis often used to stop nosebleed. Effective substances in betel leaves which serves to stop the bleeding is tannin. Objective: The aim of this study was to determine the effectiveness of the betel leaf ethanol extract gel shortened bleeding time after the revocation of deciduous teeth. Method: This research was conducted at the Department of Dental Nursing Clinic, Health Polytechnic Denpasar.This study is pure experimental research design with Completely Randomized Post Test Only Control Group Design. The total sample of 27 respondents were divided into a treatment group and two control groups. Anterior deciduous teeth on the physiological loose grade 3 or 4 is extracted, then the tooth socket is put pure gel for group 1 to group 2, epinephrine gel and gel ethanol extract of betel leaf for group 3. The bleeding time is calculated from the first moment the blood out until there is blood on filter paper that is placed on the tooth socket. Data were statistically analyzed with descriptive test and comparability test with One Way Anova. Result: The results showed bleeding time pure gel groups differ significantly with epinephrine group and the group of ethanol extract of betel leaf gel (p< 0.05. Bleeding time of epinephrine group did not differ significantly with betel leaf ethanol extract group (p>0.05. Conclusion: This means ethanol gel betel leaf extract can shorten bleeding after deciduous tooth extraction and it is suggested that the use of gel ethanol extract of betel leaves to cope with bleeding after tooth extraction.

  4. Effect of irradiation on wound healing after tooth extraction in the rachitic rats

    Kim, Mee Kyung; Hwang, Eui Hwan; Lee, Sang Rae [College of Dentistry, Kyung Hee University, Seoul (Korea, Republic of)

    2002-03-15

    To observe the histopathological changes following irradiation on the wound healing after tooth extraction in the rachitic rats. In order to carry out this study, the rats were divided into four groups: Group 1 (normal diet/non-irradiation group), Group 2 (normal diet/irradiation group), Group 3 (rachitogenic diet/non-irradiation group), and Group 4 (rachitogenic diet/irradiation group). Rachitic changes were induced with rachitogenic diet No. 2 (high calcium, low phosphorus, and Vitamin D deficient diet) for 5 weeks. After the extraction of both maxillary first molars of the rats in Group 2 and 4, the head and neck of the rats were irradiated with single absorbed dose of 10 Gy. The rats were sacrificed at the 1st, 5th, 10th, and 15th day after tooth extraction. The specimens including the extraction wound were sectioned, stained with the hematoxylin-eosin and Masson's trichrome method and examined under the light microscope. In the Group 2, the amount of newly formed bone trabeculae on the periphery of extraction socket and osteoblastic activity were reduced. In the Group 3, epithelial fusion was not revealed on the 5th day after toothe extraction and growth rate of osteoid formation was reduced. In the Group 4, necrotized tissue at the outer surface of extraction socket and destructive changes on the alveolar bones were noted on the 10th day. Epithelial fusion was not revealed and large amounts of osteoclast were noted on alveolar bone on the 15th day. The healing process of wound after tooth extraction was retarded by irradiation and especially in the rachitic rats.

  5. Immediate 3-dimensional ridge augmentation after extraction of periodontally hopeless tooth using chinblock graft

    Desai, Ankit; Thomas, Raison; Baron, Tarunkumar A.; Shah, Rucha; Mehta, Dhoom Singh

    2015-01-01

    Background The aim of the present study was to evaluate clinically and radiographically, the efficacy of immediate ridge augmentation to reconstruct the vertical and horizontal dimensions at extraction sites of periodontally hopeless tooth using an autogenous chin block graft. Material and Methods A total of 11 patients (7 male & 4 female) with localized advanced bone loss around single rooted teeth having hopeless prognosis and indicated for extraction were selected for the study. The teeth ...

  6. Alveolar Ridge Conservation by Early Bone Formation After Tooth Extraction in Rabbits. A Histomorphological Study

    Cantín, Mario; Olate, Sergio; Fuentes, Ramón; Vásquez, Bélgica

    2016-01-01

    SUMMARY Alveolar ridge volume loss is an irreversible process. To prevent this physiological event, which typically result in significant local anatomical changes in both the horizontal and the vertical dimension, some strategies are indicated to minimize the loss of ridge volume that typically follows tooth extraction. The purpose of this study was to evaluate if three different bone grafts could promote new bone formation in the alveolar socket following tooth extraction for the alveolar ridge conservation. First mandibular molars of male adults rabbits were extracted and the extraction sockets were randomly treated with three different bone grafts, one xenograft and two alloplastic grafts, and a group that received no treatment (blood clot). The extraction sockets of selected rabbits from each group were evaluated at 4, 6, or 8-week post-extraction. The results indicated that the extraction sockets treated with alloplastic graft (biphasic calcium phosphate) exhibited lamellar bone formation (6.5%) as early as four weeks after the extraction was performed. Moreover, the degree of new bone formation was significantly higher (P<0.05) in the extraction sockets treated with biphasic calcium phosphate at 8-week post-extraction than that in the other study groups. In this study, we demonstrated that the proposed animal model is useful to evaluate the bone formation after tooth extraction and the alveolar ridge conservation is feasible. The new bone formation and alveolar ridge preservation with bone graft after extraction of molar teeth, could result in the maintenance of sufficient bone volume to place an implant in an ideal restorative position without the need for ancillary implant site development procedures. PMID:27840551

  7. Evaluation of Amoxicillin & Cephalexin concentrations in dental alveolar sockets after tooth extraction

    Fakhraei AH.

    2005-06-01

    Full Text Available Statement of Problem: One of the most important complications after tooth extraction and oral and maxillofacial surgery is transient bacteraemia and prescription of prophylactic antibiotic is necessary to prevent postoperative infections in immunocompromised patients. Purpose: The aim of this study was the evaluation of cephalexin and amoxicillin concentrations in dental alveolar sockets following tooth extraction. Materials and Methods: In this interventional study, 80 healthy patients subjected to tooth extraction were divided into two groups. Each group received 1 gr amoxicillin or cephalexin and teeth were extracted 30-60-90-120-180 minutes after antibiotic intake. Blood sampling was performed immediately after extraction and concentrations of two antibiotics were measured in microbiology laboratory. ANOVA test and Post-hoc (Duncan test were used for statistical analysis with P<0.05 as the limit of significance. Results: The maximum serum concentration was 10.1006 μg/ml for amoxicillin at 120 minutes and 41.5467 μg/ml for cephalexin at 90 minutes after drug intake. The minimum inhibitory concentration (MIC of cephalexin and amoxicillin for Streptococcus sanguis was 2 μg/ml and 1 μg/ml respectively. Conclusion: The mean concentration for amoxicillin was 10 times and for cephalexin was 20 times higher than MIC.

  8. Patterns of and reasons for tooth extractions in general dental practice in Ontario, Canada.

    Murray, H; Locker, D; Kay, E J

    1996-06-01

    While substantial proportions of the population of Ontario, Canada continue to have teeth extracted, little is known about the reasons for this loss. In this survey of Ontario general dental practitioners, 128 dentists provided information on 6143 patients they saw during a reference week. Approximately one-in-seven of these patients had or were going to have one or more extractions as part of their current course of treatment. The mean number of extractions for patients having at least one tooth taken out was 2.3 (SD = 2.5). Emergency patients were more likely than regular patients to have at least one extraction but, on average, had fewer teeth taken out. Orthodontic considerations were the main reason for tooth loss in childhood, caries continued to be an important cause of tooth loss at all ages and periodontal disease accounted for more teeth lost after 40 years of age than caries. This study differs from almost all others in finding that, overall, more permanent teeth were extracted because of periodontal disease than because of caries. The former accounted for 35.9% of teeth lost and the latter for 28.9%. While this may be due to methodological differences between this and other studies, it is consistent with epidemiological data on periodontal disease in the Ontario population and data showing that Ontarians receive little in the way of periodontal care.

  9. Assessment of general pre and postoperative anxiety in patients undergoing tooth extraction: a prospective study.

    López-Jornet, Pia; Camacho-Alonso, Fabio; Sanchez-Siles, Mariano

    2014-01-01

    Our aim was to analyse the amount of anxiety and fear felt before, immediately after, and one week after, dental extraction. We studied 70 patients (35 men and 35 women (mean (SD) age 43 (±10) years), who were listed for dental extraction under local anaesthesia in a private clinic that specialised in oral surgery. Patients were evaluated on 3 consecutive occasions: immediately preoperatively, immediately postoperatively, and 7 days later. Each patient's anxiety was measured using Spielberger's State-Trait Anxiety Inventory (Spanish version), the Modified Corah Dental Anxiety Scale (MDAS) and the Dental Fear Survey. There were significant differences in the STAI-Trait scale between before and 7 days after extraction (p=0.04), and in the MDAS between before and immediately after extraction (p=0.02), and between immediately after and 7 days after extraction (p=tooth extraction may be influenced by operative techniques (type of anaesthesia, duration of operation, or position of tooth extracted), but anxiety at 7 days after extraction is not.

  10. Endophthalmitis after tooth extraction in a patient with previous perforating eye injury.

    Ogurel, Tevfik; Onaran, Zafer; Ogurel, Reyhan; Örnek, Kemal

    2015-01-01

    The aim of this stuty is to describe a case of endophthalmitis after tooth extraction in a patient with previous perforating eye injury. 50 years old male patient attempted to our clinic with complaints of sudden severe pain, reduced vision, light sensitivity and redness in the right eye. The patient stated that severe pain in his eye began approximately 12 hours following tooth extraction. The patient's ocular examination revealed a visual acuity of hand motion in the right eye. Anterior segment examination of the right eye showed intense conjunctival hyperemia, chemosis, a fine keraticprespitat and corneal edema. Dental procedures of the patients who had recently underwent ocular surgery or trauma should be done in a more controlled manner under anti -infective therapy or should be postponed in elective procedures.

  11. Examination of cardiovascular function variables in tooth extraction under local anesthesia

    Životić-Vanović Mirjana

    2006-01-01

    Full Text Available Background/Aim. Local anesthesia is the one of the most used procedures in surgical practice. It is used for toot extraction to produce analgesic and anesthetic effects. However, there is a question if it is equally safe to apply a local anesthetic combined with a vasoconstrictor (adrenaline in healthy persons, and in the patients with a certain cardiovascular system disease. The aim of this study was to determine whether there were differences in cardiovascular variables during tooth extraction in healthy persons, and in cardiovascular patients when an anesthetic was applyted with adrenaline, or without it. Methods. The examinees were divided into the group with cardiovascular diseases (CV, n = 57 of II and III type, according to the American Society of Anesthesiologists (ASA qualification, and healthy persons (H, n = 55. Both groups were randomly divided into two subgroups: CVa and Ha - where the anesthetic solution had the vasoconstrictor (3% lidocaine, and 1 : 100 000 adrenaline; CVb and Hb - where the anesthetic solution was without the vasoconstrictor (3% lidocaine. During the preparation for tooth extraction, the application of anesthetics, extraction and relaxation puls (fc, systolic (TAs and diastolic arterial blood pressure (TAd and ECG were registered. Results. The values of fc did not significantly differ among the groups in any measured term. The values of systolic and diastolic blood pressure in the groups CVa and CVb were significantly higher in all the terms of measuring (p < 0.05 from the values in the groups Ha and Hb. A significant increase of TAs was registered only in the phase of tooth extraction in the CVa and CVb group (< 0.05. The values of TAd did not significantly differ between the groups in all the measured terms. Extrasystolic beats were registered in 11 patients of the CV group and in 7 patients of the H group in the phase of anesthetic application or tooth extraction. Conclusion. This research shoved that tooth

  12. A Fatal Outcome of Rhino-orbito-cerebral Mucormycosis Following Tooth Extraction: A Case Report.

    Motaleb, Hesham Y Abdel; Mohamed, Mostafa S; Mobarak, Fahmy A

    2015-01-01

    Rhino-orbito-cerebral mucormycosis is an uncommon aggressive life-threatening opportunistic fungal infection that affects mainly the immunocompromised population with mortality rate up to 50%. Due to its aggressive nature, early detection and prompt management are of great importance for a good prognosis. Our report describes a fatal outcome of a case of rhino-orbito-cerebral mucormycosis following tooth extraction in an uncontrolled non-insulin-dependent diabetes mellitus patient after 14 days of admission.

  13. Octacalcium phosphate (OCP) collagen composites enhance bone healing in a dog tooth extraction socket model.

    Iibuchi, S; Matsui, K; Kawai, T; Sasaki, K; Suzuki, O; Kamakura, S; Echigo, S

    2010-02-01

    The authors have reported that a scaffold constructed of synthetic octacalcium phosphate (OCP) and porcine atelocollagen sponge (OCP/Col) enhanced bone regeneration more than sintered beta-tricalcium phosphate collagen composite or sintered hydroxyapatite collagen composite with a rat calvarial defect model. To aim for clinical application, the present study investigated whether OCP/Col would enhance bone healing in a dog tooth extraction socket model. Six adult, male, beagle dogs were used. The tooth extraction socket model was made by extracting bilateral third maxillary incisors and the subsequent removal of buccal bone. Disks of OCP/Col were implanted into one side of the model and the other side was untreated. The specimens were fixed 1 or 3 months after implantation. In radiographic analysis, the OCP/Col-treated group showed a wider range of radiopacity than the untreated control. Histologically, the OCP/Col-treated group showed more abundant newly formed bone than untreated control, and the implanted OCP was gradually resorbed. In morphometrical analysis, enlargement of the buccal alveolus in the OCP/Col group was significantly greater than in the untreated control. This study showed that implanted OCP/Col would be replaced by newly formed bone and OCP/Col implantation would enhance bone healing in a tooth socket model.

  14. Dry Socket following Tooth Extraction in an Iranian Dental Center: Incidence and Risk Factors Dry Socket following Tooth Extraction in an Iranian Dental Center: Incidence and Risk Factors

    Majid Eshghpour

    2013-07-01

    Full Text Available Introduction: Dry Socket (DS is a common post-surgical complication following extraction of permanent teeth. Various risk factors has been mentioned for this complication including gender, age, amount of trauma during extraction, difficulty of extraction, inappropriate irrigation, infection, smoking, and oral contraceptive use. The aim of this study was to evaluate the incidence of DS among permanent teeth extraction in an Iranian Oral and Maxillofacial clinic and also to identify risk factors. Methods: This cross-sectional study performed at Mashhad Faculty of Dentistry between January 2009 and June 2009. Total of 785 patients who underwent non-surgical extraction of permanent teeth included in this study. A questionnaire with two sections designed to collect demographic, medical, and extraction-related data along with data regarding cases returning with DS. Data were reported descriptively and analyzed using Chi-square test with 95% confidence interval. Results: Total of 1073 teeth included in this study. 46.11% of patients were male and 53.89% were female. The mean age of participants was 32.68 ± 17.63 years. Total of 31 patients (2.89% were diagnosed with dry socket. Smoking and oral contraceptives intake had significant association with incidence of DS. In contrast, age, gender, medical status, tooth location, number of anesthetic carpules, anesthetic technique, pre-extraction antibiotic consumption, and academic year of students had no significant association with the incidence of DS. All cases with DS treated and were followed until resolution of DS. Conclusion: it is recommended to identify high risk groups (smokers and oral contraceptive takers when performing extraction and to perform preventive measures in these group of patients to attenuate postoperative complications.

  15. Contour changes in human alveolar bone following tooth extraction of the maxillary central incisor.

    Li, Bei; Wang, Yao

    2014-12-01

    The purpose of this study was to apply cone-beam computed tomography (CBCT) to observe contour changes in human alveolar bone after tooth extraction of the maxillary central incisor and to provide original morphological evidence for aesthetic implant treatment in the maxillary anterior area. Forty patients were recruited into the study. Each patient had two CBCT scans (CBCT I and CBCT II), one taken before and one taken three months after tooth extraction of maxillary central incisor (test tooth T). A fixed anatomic reference point was used to orient the starting axial slice of the two scans. On three CBCT I axial slices, which represented the deep, middle, and shallow layers of the socket, labial and palatal alveolar bone widths of T were measured. The number of sagittal slices from the start point to the pulp centre of T was recorded. On three CBCT II axial slices, the pulp centres of extracted T were oriented according to the number of moved sagittal slices recorded in CBCT I. Labial and palatal alveolar bone widths at the oriented sites were measured. On the CBCT I axial slice which represented the middle layer of the socket, sagittal slices were reconstructed. Relevant distances of T on the sagittal slice were measured, as were the alveolar bone width and tooth length of the opposite central incisor. On the CBCT II axial slice, which represented the middle layer of the socket, relevant distances recorded in CBCT I were transferred on the sagittal slice. The height reduction of alveolar bone on labial and palatal sides was measured, as were the alveolar bone width and tooth length of the opposite central incisor at the oriented site. Intraobserver reliability assessed by intraclass correlation coefficients (ICCs) was high. Paired sample t-tests were performed. The alveolar bone width and tooth length of the opposite central incisor showed no statistical differences (P<0.05). The labial alveolar bone widths of T at the deep, middle, and shallow layers all showed

  16. 拔牙出血后的处理%Treatment of bleeding after tooth extraction

    万红艳

    2014-01-01

    The patients with hemorrhage after tooth extraction operation,is the clinical common complications of tooth extraction,there are a variety of pathological reasons.Comprehensive analysis,can be divided into two types,one is the systemic factors,one is the local factors.Systemic factors,is derived from the patient's physical condition,such as in patients with coagulation mechanism changes,such as women in menstrual period or in patients with blood.Local factors,from external factors,relations with operation the operator is bigger.After tooth extraction,for example,the doctor did not clean up inlfammatory granulation tissue,at the same time tooth cause soft tissue and gum tear.%本文写作的内容有拔牙后出血的原因、治疗方法以及预防措施。选取拔牙后出血患者70例,时间跨度为2012年4月~2014年4月,根据病患的临床总结,对治疗方法予以分析。治疗结果表明,患者就诊时所出现的状况均已消失。在临床上,若拔牙后出血情况未予以重视,并及时进行处理,可能会危及生命,预防措施采取得当,止血效果将会快而明显。

  17. 拔牙患儿的心理干预%Psychological Care in Children's Tooth Extraction

    张洁; 应艳; 陈潇卿

    2011-01-01

    目的:探讨心理干预在儿童拔牙手术中的作用,拟建立符合儿童拔牙的干预模式.方法:选拔牙患儿190例,分为2组,研究组和对照组各95例,研究组在医护人员心理干预下拔牙,对照组采用常规模式拔牙.结果:研究组满意率为95.8%,对照组满意率为80%.结论:心理干预能缓解患儿拔牙的紧张情绪,提高了拔牙的配合率和成功率.%Objective: To compare the psychological care in children's tooth extraction with/without care and to establish a nursing model.Methods: One hundred and ninety children required extraction were recruited in the study.95 of these cases were equally distributed into two groups: observation and control groups.The observation group was under all psychological care during tooth extraction, while the control group was under conventional extraction model.Results:Psychological care greatly reduced dental anxiety.The satisfaction proportion of the observation group was 95.8% while the control group was 80%.Conclusion: The implementation of psychological care in children's tooth extraction can effectively reduce dental anxiety and cause their high coordination and success rate.

  18. Effect of Alendronate on Bone Formation during Tooth Extraction Wound Healing.

    Tanoue, R; Koi, K; Yamashita, J

    2015-09-01

    Alendronate (ALN) is an antiresorptive agent widely used for the treatment of osteoporosis. Its suppressive effect on osteoclasts has been extensively studied. However, the effect of ALN on bone formation is not as clear as its effect on resorption. The objective was to determine the effect of short-term ALN on bone formation and tooth extraction wound healing. Molar tooth extractions were performed in mice. ALN, parathyroid hormone (PTH), or saline (vehicle control) was administered. PTH was used as the bone anabolic control. Mice were euthanized at 3, 5, 7, 10, and 21 d after extractions. Hard tissue healing was determined histomorphometrically. Neutrophils and lymphatic and blood vessels were quantified to evaluate soft tissue healing. Gene expression in the wounds was assessed at the RNA level. Furthermore, the vossicle bone transplant system was used to verify findings from extraction wound analysis. Alkaline phosphatase (ALP) was visualized in the vossicles to assess osteoblast activity. ALN exhibited no negative effect on bone formation. In intact tibiae, ALN increased bone mass significantly more than PTH did. Consistently, significantly elevated osteoblast numbers were noted. In the extraction sockets, bone fill in the ALN-treated mice was equivalent to the control. Genes associated with bone morphogenetic protein signaling, such as bmp2, nog, and dlx5, were activated in the extraction wounds of the ALN-treated animals. Bone formation in vossicles was significantly enhanced in the ALN versus PTH group. In agreement with this, ALN upregulated ALP activity considerably in vossicles. Neutrophil aggregation and suppressed lymphangiogenesis were evident in the soft tissue at 21 d after extraction, although gross healing of extraction wounds was uneventful. Bone formation was not impeded by short-term ALN treatment. Rather, short-term ALN treatment enhanced bone formation. ALN did not alter bone fill in extraction sockets.

  19. Hemodynamic response after injection of local anesthetics with or without adrenaline in adult Nigerian subjects undergoing simple tooth extraction

    Olutayo James

    2015-01-01

    Full Text Available Objective: This study was conducted to determine the changes in the blood pressure (BP and the pulse rate (PR of normotensive patients having dental extraction under the administration of 2% lignocaine local anesthetic with or without adrenaline. Materials and Methods: This prospective study was carried out on 325 consecutive normotensive patients who presented at the exodontia clinic of the Lagos University Teaching Hospital (LUTH, Lagos, Yoruba State, Nigeria from December 2004 to August 2005 for simple tooth extraction. The patients were randomly allocated into two groups according to the type of anesthetic solution employed. Group A had tooth extraction done under the administration of 2% lignocaine with adrenaline (1:80,000 while group B had tooth extraction done under the administration of 2% lignocaine local anesthetic without vasoconstrictor (plain lignocaine. Each patient had single tooth extracted. The following parameters were monitored in each of the surgical interventions: systolic blood pressure (SBP, diastolic blood pressure (DBP, and PR. Measurements were taken in the waiting room before surgery, during the surgery after local anesthesia, during tooth extraction, and 15 min after tooth extraction. Results: The sample consisted of 176 females and 149 males. Age range of the patients was 18-89 years with the mean age of 35.08 ± 15.60 years. The hemodynamic responses to lignocaine with adrenaline (1:80,000 and plain lignocaine essentially follow the same pattern in the study. There was no statistically significant difference between the measured parameters in the two groups after the administration of local anesthetics. Conclusion: This study, therefore, shows that there was no difference in the hemodynamic changes observed with the use of lignocaine with adrenaline or plain lignocaine during a simple tooth extraction in healthy adults.

  20. Effect of alveolar ridge preservation after tooth extraction: a systematic review and meta-analysis.

    Avila-Ortiz, G; Elangovan, S; Kramer, K W O; Blanchette, D; Dawson, D V

    2014-10-01

    Alveolar ridge preservation strategies are indicated to minimize the loss of ridge volume that typically follows tooth extraction. The aim of this systematic review was to determine the effect that socket filling with a bone grafting material has on the prevention of postextraction alveolar ridge volume loss as compared with tooth extraction alone in nonmolar teeth. Five electronic databases were searched to identify randomized clinical trials that fulfilled the eligibility criteria. Literature screening and article selection were conducted by 3 independent reviewers, while data extraction was performed by 2 independent reviewers. Outcome measures were mean horizontal ridge changes (buccolingual) and vertical ridge changes (midbuccal, midlingual, mesial, and distal). The influence of several variables of interest (i.e., flap elevation, membrane usage, and type of bone substitute employed) on the outcomes of ridge preservation therapy was explored via subgroup analyses. We found that alveolar ridge preservation is effective in limiting physiologic ridge reduction as compared with tooth extraction alone. The clinical magnitude of the effect was 1.89 mm (95% confidence interval [CI]: 1.41, 2.36; p < .001) in terms of buccolingual width, 2.07 mm (95% CI: 1.03, 3.12; p < .001) for midbuccal height, 1.18 mm (95% CI: 0.17, 2.19; p = .022) for midlingual height, 0.48 mm (95% CI: 0.18, 0.79; p = .002) for mesial height, and 0.24 mm (95% CI: -0.05, 0.53; p = .102) for distal height changes. Subgroup analyses revealed that flap elevation, the usage of a membrane, and the application of a xenograft or an allograft are associated with superior outcomes, particularly on midbuccal and midlingual height preservation.

  1. Factors determining tooth extraction anxiety and fear in adult dental patients: a systematic review.

    Astramskaitė, I; Poškevičius, L; Juodžbalys, G

    2016-12-01

    The aim of this study was to review previous studies and to identify reliable factors determining anxiety in adult patients undergoing tooth extraction procedures. An electronic literature search was conducted of the MEDLINE, ScienceDirect, SpringerLink, and Wiley Online Library databases covering the period January 2005 to May 2015. Sequential screening was performed at the title/abstract and full-text level. The review included all human prospective and retrospective follow-up studies and clinical trials, cohort studies, case-control studies, and case series that demonstrated at least one factor determining tooth extraction anxiety and/or fear and used specific scales for measurement. The search identified 16 articles meeting the inclusion criteria. Factors related to tooth extraction in patients were assessed: propensity to anxiety (P<0.05), pain experience or expectations (P<0.05), level of disturbance during the procedure (P<0.001), difficulty of the procedure (P=0.034), marital status (P=0.003), social class (P=0.012), and type of local anaesthesia (P=0.008). Using a video as the method of providing information (P<0.05) and having had a previous negative dental experience (P<0.05) led to an increase in patient anxiety level. Due to disagreements between studies, further investigations into the other factors are required to clarify the results. However, the absence of a single and appropriate scale that includes both the patient's evaluation and that of the doctor, hinders the rating of patient anxiety.

  2. Effectiveness of preemptive lysine clonixinate in tooth extraction: A randomized controlled trial.

    Pedro Aravena

    2013-12-01

    Full Text Available Aim: To evaluate the effectiveness of prophylaxis with single-dose analgesic clonixinate lysine (CL 125mg in patients undergoing tooth extraction. Methods: A double-blind randomized placebo-controlled trial. Were included in the study patients ASA I and II with dental extraction indication in the city of Valdivia, Chile in October 2012. Were randomly assigned in two groups: the treatment group received a doses of 125mg of CL fifteen minutes before the surgery, and a control group who received placebo. Both groups used a CL as a rescue analgesic. Using a survey, patients reported the degree of pain via a visual analog scale (VAS during the first day, at 24 and 48 hours after surgery. In addition, registered the number of CL capsules consumed as a ransom for 3 days after the surgery. We compared the analgesic effect observed in (VAS and the number of additional analgesic consumption between the two groups using t-test (p<0.05. Results: Fifty-four patients were operated and there was no statistically significant difference between the pain scores between the two groups. Premedication patients reported the use of equal number of rescue capsules comparing with the control group. Conclusion: CL analgesic prophylaxis proved no more effective in reducing pain after tooth extraction when comparing to the use of placebo in a postoperative doses.

  3. Bilateral Blindness in a Patient With Temporal Arteritis After Wisdom Tooth Extraction.

    Tartaglia, Gianluca Martino; Maiorana, Carlo; Sforza, Chiarella

    2016-03-01

    A 78-year-old woman reported pain in her right hemiface (middle and upper portions) together with nuchal headache, some days after upper right wisdom tooth extraction. She was treated with nonsteroidal anti-inflammatory drugs by her dentist. Three weeks later, a localized headache over her right superficial temporal artery was reported, and progressive bilateral blindness appeared. A biopsy showed a late stage of temporal arteritis. All the symptoms disappeared following corticosteroid treatment, except blindness. The possible complications linking oral bacteria and extraoral infections and diseases should always be attentively considered during the clinical management of fragile patients.

  4. Effects of caffeic acid phenethyl ester on palatal mucosal defects and tooth extraction sockets

    Günay A

    2014-10-01

    Full Text Available Ahmet Günay,1 Osman Fatih Arpağ,2 Serhat Atilgan,3 Ferhan Yaman,3 Yusuf Atalay,4 İzzet Acikan3 1Department of Periodontology, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey; 2Department of Periodontology, Faculty of Dentistry, Mustafa Kemal University, Hatay, Turkey; 3Department of Maxillofacial Surgery, Faculty of Dentistry, Dicle University, Diyarbakir, Turkey; 4Department of Maxillofacial Surgery, Faculty of Dentistry, Kocatepe University, Afyon, Turkey Aim: The purpose of this study was to evaluate the effects of caffeic acid phenethyl ester (CAPE on palatal mucosal defects and tooth extraction sockets in an experimental model.Materials and methods: Forty-two male Sprague-Dawley rats with a mean age of 7 weeks and weighing 280–490 g were used in this study. The rats were randomly divided into two groups: group A (the control group, n=21 and group B (the experimental group, n=21. Under anesthesia with ketamine (8 mg/100 g, intraperitoneally, palatal mucosal defects were created and tooth extraction was performed in the rats in groups A and B. Group A received no treatment, whereas group B received CAPE. CAPE was injected daily (10 µmol/kg, intraperitoneally. The rats were killed on days 7, 14, and 30 after the procedures. Palatal mucosa healing and changes in bone tissue and fibrous tissue were evaluated histopathologically.Result: Pairwise comparisons showed no statistically significant difference between days 7 and 14 in either group (P>0.05. At day 30, bone healing was significantly better in group B (CAPE than in group A (control (P<0.05. Fibrinogen levels at day 30 were significantly higher in group A (control than in group B (CAPE (P<0.05. Pairwise comparisons showed no statistically significant difference in palatal mucosa healing levels between days 7 and 14 in both groups (P>0.05.Conclusion: In conclusion, the findings of this study suggest that CAPE can significantly improve tooth socket healing. Keywords: caffeic

  5. A preliminary study of local administration of dexamethasone after tooth extraction: Better preservation of residual alveolar ridge?

    Poštić Srđan D.

    2014-01-01

    Full Text Available Background/Aim. It is important that the height of the edentulous alveolar ridge after tooth extraction remains at a reasonable acceptable level for as long as possible. The aim of this study was to report preliminary results of the clinical effect of local oral submucous administration of dexamethasone after tooth extractions in order to prepare alveolar supporting tissues for acceptance of removable dentures. Methods. In a total of 15 patients (11 partially and 4 completely edentulous the quantity of 0.25 mL to 0.5 mL of dexamethasone was injected bucally and orally in the region of the tooth socket after complicated extractions. Results. Healing of extraction wounds was uneventful in all the patients, without pain or local inflammation. Conclusion. Dexamethasone can be locally applied to oral tissues to prevent post-extraction inflammation and extensive resorption of the residual alveolar ridge. The obtained results are promising for patients undergoing classic prosthodontic rehabilitation soon after tooth extraction, demonstrating that there are no adverse effects after local oral corticosteroids administration. [Projekat Ministarstva nauke Republike Srbije, br. 175021

  6. Effect of biomaterial properties on bone healing in a rabbit tooth extraction socket model.

    Fisher, John P; Lalani, Zahid; Bossano, Carla M; Brey, Eric M; Demian, Nagi; Johnston, Carol M; Dean, David; Jansen, John A; Wong, Mark E K; Mikos, Antonios G

    2004-03-01

    In this work we sought to understand the effect of biomaterial properties upon healing bone tissue. We hypothesized that a hydrophilic polymer gel implanted into a bone tissue defect would impede the healing process owing to the biomaterial's prevention of protein adsorption and thus cell adhesion. To test this hypothesis, healing bone was investigated within a rabbit incisor extraction socket, a subcritical size bone defect that resists significant soft tissue invasion by virtue of its conformity. After removal of the incisor teeth, one tooth socket was left as an empty control, one was filled with crosslinked polymer networks formed from the hydrophobic polymer poly(propylene fumarate) (PPF), and one was filled with a hydrogel formed from the hydrophilic oligomer oligo(poly(ethylene glycol) fumarate) (OPF). At five different times (4 days as well as 1, 2, 4, and 8 weeks), jaw bone specimens containing the tooth sockets were removed. We analyzed bone healing by histomorphometrical analysis of hematoxylin and eosin stained sections as well as immunohistochemically stained sections. The proposed hypothesis, that a hydrophilic material would hinder bone healing, was supported by the histomorphometrical results. In addition, the immunohistochemical results reflect molecular signaling indicative of the early invasion of platelets, the vascularization of wound-healing tissue, the differentiation of migrating progenitor cells, and the formation and remodeling of bone tissue. Finally, the results emphasize the need to consider biomaterial properties and their differing effects upon endogenous growth factors, and thus bone healing, during the development of tissue engineering devices.

  7. [Preserving the natural tooth versus extraction and implant placement: making a rational clinical decision].

    Tsesis, I; Nemkowsky, C E; Tamse, E; Rosen, E

    2010-01-01

    Modern dental practice offers a wide variety of treatment alternatives and modalities. With the wider scale of treatment options, new dilemmas emerged. A common dilemma is the decision whether to preserve the natural tooth by endodontic treatment, or to extract the tooth and replace it with a single dental implant. The clinician needs to remember that the basic goal of dental implants is to replace missing teeth, and not present teeth. Prosthodontic, periodontal, and esthetic considerations should be integrated in the treatment planning process. Long-term prognosis, the capabilities offered by the modern endodontic treatment, the alternatives in case of treatment failure, post treatment quality of life and patient's preferences should all be recognized and incorporated in the dentist decision making. An important factor is the communication between the prosthodontist and the endodontist before and during the treatment in order to avoid possible risks or treatment failure. The integration of these factors would assist the clinician to achieve a rational treatment plan for the benefit of the patient.

  8. Anesthetic success of 1.8ml lidocaine 2% for mandibular tooth extraction. A pilot study

    Pedro Aravena

    2013-04-01

    Full Text Available Aim: To determine the anesthetic effect of a 1.8ml cartridge of anesthetic lidocaine 2% with epinephrine 1:100,000 in inferior alveolar nerve block (NAI for the extraction in mandibular teeth. Material and methods: A pilot study with analitic design. Participating patients of Dental Emergency Service volunteers from Valdivia-Chile for mandibular teeth extractions attending between May and July of 2010. The anesthetic technique was performed by a dentist using only one cartridge of anesthetic to the NAI. After 15 minutes, the effect was considered effective when anesthetic not require reinforcement with additional anesthesia during extraction of teeth. We analyzed the relationship between success anesthetic effect with sex, age, diagnosis of tooth and type and level of pain observed (chi-square and logistic regression, p<0.05. Results: 62 patients were selected, of which only 47(75.8% was achieved anesthetic success. There was no statistical association with sex, age, type or dental diagnosis and perceived pain. Conclusion: Using a 1.8ml cartridge of anesthesia was effective in three of four patients treated by extraction of mandibular teeth. It suggests further research in relation to the clinical effectiveness of other anesthetics with the same dose in NAI.

  9. Effect of mangosteen peel extract combined with demineralized freezed-dried bovine bone xenograft on osteoblast and osteoclast formation in post tooth extraction socket

    Utari Kresnoadi

    2016-12-01

    Full Text Available Background: Tooth extraction, a common procedure in dentistry, can cause bone resorption during socket healing. Therefore, it is important to perform socket preservation procedure to maintain alveolar bone. Providing a combination of mangosteen peel extract with demineralized freezed-dried bovine bone xenograft (DFDBBX in tooth extraction socket was expected to accelerate alveol bone formation. Purpose: This study aims to determine the effect of mangosteen peel extract combined with DFDBBX introduced into the socket of post tooth extraction on the formation of osteoblasts and osteoclasts. Method: Twenty-eight (28 Cavia cobayas were divided into four groups. Extraction to the lower left incisor of Cavia cobaya was performed. The extraction socket was filled with 25 gram of PEG (group I as a control, active materials consisted of mangosteen peel extract and DFDBBX 0.5% (group II, active materials consisted of mangosteen peel extract and DFDBBX 1% (group III, and active materials consisted of mangosteen peel extract and DFDBBX 2% (group IV. After thirty days, those Cavia cobayas were sacrificed. By using HE on Histopatological examination, the number of osteoblasts and osteoclasts were measured by light microscope with 400 times of magnification. The statistical analysis was then performed using oneway Anova & TukeyHSD test. Result: The component active materials consisted of mangosteen peel extract and DFDBBX 2% had the most significant results related to the formation of osteoblasts and osteoclasts. Conclusion: Mangosteen peel extract combined with DFDBBX can increase osteoblasts and decrease osteoclasts in the socket of tooth extraction in Cavia cobaya. The combination of mangosteen peel extract and DFDBBX 2% is the most effective material in increasing osteoblast and decreasing osteoclast.

  10. Graphene oxide scaffold accelerates cellular proliferative response and alveolar bone healing of tooth extraction socket.

    Nishida, Erika; Miyaji, Hirofumi; Kato, Akihito; Takita, Hiroko; Iwanaga, Toshihiko; Momose, Takehito; Ogawa, Kosuke; Murakami, Shusuke; Sugaya, Tsutomu; Kawanami, Masamitsu

    2016-01-01

    Graphene oxide (GO) consisting of a carbon monolayer has been widely investigated for tissue engineering platforms because of its unique properties. For this study, we fabricated a GO-applied scaffold and assessed the cellular and tissue behaviors in the scaffold. A preclinical test was conducted to ascertain whether the GO scaffold promoted bone induction in dog tooth extraction sockets. For this study, GO scaffolds were prepared by coating the surface of a collagen sponge scaffold with 0.1 and 1 µg/mL GO dispersion. Scaffolds were characterized using scanning electron microscopy (SEM), physical testing, cell seeding, and rat subcutaneous implant testing. Then a GO scaffold was implanted into a dog tooth extraction socket. Histological observations were made at 2 weeks postsurgery. SEM observations show that GO attached to the surface of collagen scaffold struts. The GO scaffold exhibited an interconnected structure resembling that of control subjects. GO application improved the physical strength, enzyme resistance, and adsorption of calcium and proteins. Cytocompatibility tests showed that GO application significantly increased osteoblastic MC3T3-E1 cell proliferation. In addition, an assessment of rat subcutaneous tissue response revealed that implantation of 1 µg/mL GO scaffold stimulated cellular ingrowth behavior, suggesting that the GO scaffold exhibited good biocompatibility. The tissue ingrowth area and DNA contents of 1 µg/mL GO scaffold were, respectively, approximately 2.5-fold and 1.4-fold greater than those of the control. Particularly, the infiltration of ED2-positive (M2) macrophages and blood vessels were prominent in the GO scaffold. Dog bone-formation tests showed that 1 µg/mL GO scaffold implantation enhanced bone formation. New bone formation following GO scaffold implantation was enhanced fivefold compared to that in control subjects. These results suggest that GO was biocompatible and had high bone-formation capability for the scaffold

  11. Morphological studies on the healing process of tooth extraction wounds in whole body irradiated rats

    Hosokawa, Yoichiro (Hokkaido Univ., Sapporo (Japan). School of Dentistry)

    1991-06-01

    The present studies were performed to investigate the healing process of the tooth extraction wound in whole body irradiated rats and to clarify the effect of irradiation on bone metabolism. One hundred and seven Wistar rats of about 100 g body weight were used and divided into 3 groups. Whole body irradiated rats were given single exposure with a dose of 8 Gy. The region of the left upper molars of local irradiated rats as controls, was exposed to 8 Gy. On the 7th day after irradiation, the left upper first molar of each rat was extracted. The rats were sacrificed at intervals of 1 to 14 days after extraction. Non-irradiated rats were sacrificed at the same intervals after extraction. The maxillary bone including the extraction wound was evaluated, histologically, histometrically and ultrastructurally. From the histological and histometrical findings, the difference of the healing process between non-irradiated rats and locally irradiated rats is not significant. In whole body irradiated rats, the healing process especially in the socket was disturbed. The osteoblastic new bone formation following production of granulation tissue was interfered with. Ultrastructurally, the cytoplasmic organellae were poorly developed in the osteoblast and osteoid formation was reduced in the socket. But periosteal new bone formation was the same as that of the locally irradiated rats. In whole body irradiated rats, the osteoclasts in the interradicular alveolar bone were decreased and have smaller nuclei, compared with non-irradiated and locally irradiated rats. Histometrically, the amount of bone loss was decreased in whole body irradiated rats. Ultrastructurally, the cyoplasmic organellae and ruffled border were poorly developed in the osteoclasts of whole body irradiated rats. The findings suggested that irradiation induced cytological changes not only in osteoblasts but in osteoclasts and these changes resulted in the delayed healing of extraction wound. (author) 106 refs.

  12. Effect of socket preservation therapies following tooth extraction in non-molar regions in humans: a systematic review

    ten Heggeler, J.M.A.G.; Slot, D.E.; van der Weijden, G.A.

    2011-01-01

    Objective: To assess, based on the existing literature, the benefit of socket preservation therapies in patients with a tooth extraction in the anterior or premolar region as compared with no additional treatment with respect to bone level. Material and methods: MEDLINE-PubMed and the Cochrane Centr

  13. The Use of Aloe Vera Extract as a Novel Storage Media for the Avulsed Tooth

    Samaneh Badakhsh

    2014-07-01

    Full Text Available Background: Tooth avulsion is one of the most severe dental traumas which most often occur in children. When immediate replantation is not possible, storage in a proper media may lead to a prolonged survival rate. Aloe Vera is a cactus like plant with green, tapered leaves that are filled with a transparent viscous gel. This medicinal plant has significant anti-inflammatory, antioxidant, antibacterial and antifungal effects. The purpose of this study was to assess the effectiveness of different concentrations of Aloe Vera extract compared to DMEM (cell culture medium and egg white. Methods: The periodontal ligament (PDL cells were cultured and certain number of cells were treated with Aloe Vera extract (in four different concentrations, egg white and culture media for 1, 3, 6, and 9 hours. Cell viability was determined by using the (3-[4, 5-dimethylthiazolyl-2]-2, 5-diphenyltetrazolium bromide assay. Moreover, One-way ANOVA and post hoc (LSD test were used for analyzing the study groups. Results: The results indicate that culture media and Aloe Vera extract (10, 30, and 50% concentration were statistically similar and significantly preserved more PDL cells compared to other experimental storage media. Conclusion: Aloe Vera 10, 30, and 50% may be recommended as a suitable storage media for avulsed teeth.

  14. Graphene oxide scaffold accelerates cellular proliferative response and alveolar bone healing of tooth extraction socket

    Nishida E

    2016-05-01

    Full Text Available Erika Nishida,1 Hirofumi Miyaji,1 Akihito Kato,1 Hiroko Takita,2 Toshihiko Iwanaga,3 Takehito Momose,1 Kosuke Ogawa,1 Shusuke Murakami,1 Tsutomu Sugaya,1 Masamitsu Kawanami11Department of Periodontology and Endodontology, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan; 2Support Section for Education and Research, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan; 3Laboratory of Histology and Cytology, Hokkaido University Graduate School of Medicine, Sapporo, JapanAbstract: Graphene oxide (GO consisting of a carbon monolayer has been widely investigated for tissue engineering platforms because of its unique properties. For this study, we fabricated a GO-applied scaffold and assessed the cellular and tissue behaviors in the scaffold. A preclinical test was conducted to ascertain whether the GO scaffold promoted bone induction in dog tooth extraction sockets. For this study, GO scaffolds were prepared by coating the surface of a collagen sponge scaffold with 0.1 and 1 µg/mL GO dispersion. Scaffolds were characterized using scanning electron microscopy (SEM, physical testing, cell seeding, and rat subcutaneous implant testing. Then a GO scaffold was implanted into a dog tooth extraction socket. Histological observations were made at 2 weeks postsurgery. SEM observations show that GO attached to the surface of collagen scaffold struts. The GO scaffold exhibited an interconnected structure resembling that of control subjects. GO application improved the physical strength, enzyme resistance, and adsorption of calcium and proteins. Cytocompatibility tests showed that GO application significantly increased osteoblastic MC3T3-E1 cell proliferation. In addition, an assessment of rat subcutaneous tissue response revealed that implantation of 1 µg/mL GO scaffold stimulated cellular ingrowth behavior, suggesting that the GO scaffold exhibited good biocompatibility. The tissue ingrowth area and DNA contents of 1

  15. 微创拔牙术在下颌阻生智齿拔除中的应用效果%Application effect of minimally invasive tooth extraction operation in mandibular impacted tooth extraction

    祝永涛

    2016-01-01

    Objective:To explore the application method and clinical effect of minimally invasive tooth extraction operation in mandibular impacted tooth extraction.Methods:160 patients with single mandibular impacted tooth extraction were selected.They were divided into the observation group and the control group with 80 cases in each.The patients in the observation group were given minimally invasive tooth extraction.The patients in the control group were given traditional instruments tooth extraction.The effect between groups was compared.Results:The operation time of the observation group was (15.5±2.5) minutes,and that of the control group was (28.5±3.5) minutes.The complication incidence rate of the observation group was significantly lower than that of the control group(P<0.05).Postoperative 5 days for review,the postoperative bleeding,severe swelling,limited mouth opening, dry chamfer disease and showing fear of the observation group were significantly lower than those of the control group(P<0.05). Conclusion:The minimally invasive tooth extraction operation in mandibular impacted tooth extraction has short operation time, small trauma,low complication incidence rate.It improves the identification and treatment effect of patients.It is significantly better than the traditional instruments tooth extraction method.%目的:探讨微创拔牙技术在下颌阻生智齿拔除中的应用方法及临床效果。方法:收治单颗下颌阻生智齿拔除患者160例,随机分为观察组和对照组,每组80例。观察组采用微创拔牙,对照组采用传统器械拔牙,比较两组疗效。结果:观察组手术时间(15.5±2.5)min,对照组(28.5±3.5)min;观察组并发症发生率明显低于对照组(P<0.05)。术后5 d 复查,观察组术后出血、严重肿胀、张口受限、干槽症及出现畏惧心理者明显低于对照组(P<0.05)。结论:微创手术拔除下颌阻生智齿拔除手术时间短、创伤小、并发症发生

  16. Successful medical treatment for globe penetration following tooth extraction in a dog.

    Guerreiro, Cleo E; Appelboam, Helen; Lowe, Robert C

    2014-03-01

    A five-year-old entire male Tibetan Terrier was referred for left-sided periorbital swelling and blepharospasm 4 days following ipsilateral maxillary tooth extraction. Examination of the left eye revealed mild exophthalmos, pain on retropulsion, and absent menace response and pupillary light reflexes. Examination of the posterior segment was not possible owing to the anterior segment pathology. Differential diagnoses considered were iatrogenic globe penetration and peribulbar abscess/cellulitis. Ocular ultrasound was consistent with a penetrating wound to the globe. Treatment with systemic prednisolone and marbofloxacin, and topical atropine sulfate 1%, prednisolone acetate, and brinzolamide was started. Marked clinical improvement allowed visual confirmation of the perforation. Oral prednisolone was tapered over the following 10 weeks. At final re-examination (10 months), the patient was visual, and fundic examination revealed an additional chorioretinal scar, most likely an exit wound that was obscured by vitreal debris on initial examinations. Neither scar was associated with retinal detachment. To the authors' knowledge, this is the first reported case of successful medical management of iatrogenic globe penetration following exodontic procedures.

  17. Sudden hearing loss and vertigo after tooth extraction successfully treated with combined therapy including HBO2: a case report.

    Yilmaz, Huseyin Baki; Erdogan, Raziye Banu Atalay; Paksoy, Mustafa; Sanli, Arif

    2015-01-01

    Sudden sensorineural hearing loss (SSNHL) is a decrease in hearing of at least 30 dB that occurs within three days and which affects at least three consecutive frequencies in either ear or both ears. This case report describes a woman who had sudden hearing loss and vertigo in the right ear after tooth extraction. As the first-line therapy, systemic and intratympanic steroid injections were used this led to a slight improvement; however, the majority of improvement in hearing was not observed until hyperbaric oxygen (HBO2) therapy was instituted on the 20th day of hearing loss. Sudden hearing loss and vertigo after tooth extraction is an otologic emergency and early evaluation and treatment are effective. HBO2, although employed beyond the Undersea and Hyperbaric Medical Society's recommended initial 14 days of symptom onset, very was effective for this particular case.

  18. Increased incidence of osteonecrosis of the jaw after tooth extraction in patients treated with bisphosphonates: a cohort study.

    Yamazaki, T; Yamori, M; Ishizaki, T; Asai, K; Goto, K; Takahashi, K; Nakayama, T; Bessho, K

    2012-11-01

    This study estimated the cumulative incidence and risk ratio for osteonecrosis of the jaw (ONJ) after tooth extraction in patients with and without administration of bisphosphonates (BP) and identified potential risk factors for bisphosphonate-induced osteonecrosis of the jaw (BIONJ). A cohort study was conducted in all patients undergoing tooth extraction at a university hospital in Japan from April 2006 to June 2009. Of 3216 patients, 126 had BP administration, of whom 5 (3.9%, 95% confidence interval (CI): 1.2-9.2) developed ONJ, versus 1 (0.032%, 95% CI: 0.00081-0.18) among 3090 patients without BP administration. BP administration was associated with the development of ONJ after tooth extraction, with an unadjusted risk ratio of 122.6 (95% CI: 14.4-1041.8). When stratified by age and route of BP administration, the risk ratio for ONJ patients aged 65 years or older with intravenous BP administration compared to those without was 200.2 (95% CI: 23.8-1679.4, P<0.001). Patients receiving BP showed a significant association between the incidence of BIONJ and alveolar bone loss score. The risk of ONJ is higher in patients with than without BP administration, particularly intravenous administration. Severe periodontitis might be a risk factor for BIONJ.

  19. Expression pattern of sonic hedgehog signaling and calcitonin gene-related peptide in the socket healing process after tooth extraction.

    Pang, Pai; Shimo, Tsuyoshi; Takada, Hiroyuki; Matsumoto, Kenichi; Yoshioka, Norie; Ibaragi, Soichiro; Sasaki, Akira

    2015-11-06

    Sonic Hedgehog (SHH), a neural development inducer, plays a significant role in the bone healing process. Calcitonin gene-related peptide (CGRP), a neuropeptide marker of sensory nerves, has been demonstrated to affect bone formation. The roles of SHH signaling and CGRP-positive sensory nerves in the alveolar bone formation process have been unknown. Here we examined the expression patterns of SHH signaling and CGRP in mouse socket by immunohistochemistry and immunofluorescence analysis. We found that the expression level of SHH peaked at day 3 and was then decreased at 5 days after tooth extraction. CGRP, PTCH1 and GLI2 were each expressed in a similar pattern with their highest expression levels at day 5 and day 7 after tooth extraction. CGRP and GLI2 were co-expressed in some inflammatory cells and bone forming cells. In some areas, CGRP-positive neurons expressed GLI2. In conclusion, SHH may affect alveolar bone healing by interacting with CGRP-positive sensory neurons and thus regulate the socket's healing process after tooth extraction.

  20. A randomized controlled evaluation of alveolar ridge preservation following tooth extraction using deproteinized bovine bone mineral and demineralized freeze-dried bone allograft

    Rokhsareh Sadeghi

    2016-01-01

    Conclusion: Based on the findings of this study, both materials have positive effect on alveolar ridge preservation after tooth extraction, but there was more new bone formation and less residual graft particles in DFDBA group than in DBBM group.

  1. The endodontically involved tooth: treat, or extract, and replace?%牙髓病患牙:治疗,拔除,种植?

    Roger J.Smales

    2010-01-01

    @@ Introduction In recent years there has been increasing discussion and controversy regarding endodontic therapy and restoration versus tooth extraction and replacement with an osseointegrated dental implant-supported single crown[1-10].

  2. Preoperative administration of 0.2% chlorhexidine mouthrinse reduces the risk of bacteraemia associated with intra-alveolar tooth extraction.

    Ugwumba, Chinedu U; Adeyemo, Wasiu L; Odeniyi, Olalekan M; Arotiba, Godwin T; Ogunsola, Folasade T

    2014-12-01

    The aim of the study was to investigate the effect of preoperative 0.2% chlorhexidine mouthwash on the risk of bacteraemia following routine intra-alveolar tooth extraction. The study was a randomized controlled clinical study of 101 subjects who underwent intra-alveolar dental extractions under local anaesthesia. Subjects were randomly assigned to either chlorhexidine or a control group. The chlorhexidine group had 0.2% chlorhexidine mouthwash administered for 1 min before any dental manipulation, and the control group had a mouthrinse of sterile water. Blood samples were collected at baseline, 1 min and 15 min after the dental extractions. Subculture and further identification of the isolated bacteria were performed by conventional microbiological techniques. There was a statistically significant difference in the incidence of bacteraemia between the control group (52.4%) and chlorhexidine group (27.1%) (P = 0.012). Bacteraemia was most frequently detected at 1 min after extraction (33.3%). Of the 30 subjects who had positive blood culture at 1 min, bacteraemia persisted in 8 (26.7%) of the subjects after 15 min. Bacteria isolated included Staphylococcus aureus, Actinomycetes naesulendi, Prevotella species, Streptococcus spp., and Acinetobacter iwoffii. Routine use of 0.20% chlorhexidine mouthwash before dental extraction is recommended to reduce the risk of bacteraemia following tooth extraction.

  3. Autogenous tooth transplantation for replacing a lost tooth: case reports

    Kang, Ji-Youn; Chang, Hoon-Sang; Hwang,Yun-Chan; Hwang, In-Nam; Oh, Won-Mann; LEE, Bin-Na

    2013-01-01

    The autogenous tooth transplantation is an alternative treatment replacing a missing tooth when a suitable donor tooth is available. It is also a successful treatment option to save significant amount of time and cost comparing implants or conventional prosthetics. These cases, which required single tooth extraction due to deep caries and severe periodontal disease, could have good results by transplanting non-functional but sound donor tooth to the extraction site.

  4. Study on the effects of electron beam irradiation on tooth extraction wound healing in rats. With special reference to irradiation after extraction

    Suzuki, Akiyoshi (Nihon Univ., Tokyo. School of Dentistry)

    1983-11-01

    The wound of the upper jaw 3 days after the first molar tooth extraction in female rats was exposed to 1,500 rads (Group 2) and 2,000 rads (Group 3) of the 10 MeV electron beams, and its pathohistological changes were compared with those of rats with the tooth extraction alone (control group). In the control group, the tooth extraction wound was covered with epithelium 10 days later and new bones were formed 17 days later. Wound healing with the epithelium was seen in all irradiated rats 24 days later. The formation of the new teeth was seen 24 days later in the Group 2 and 38 days later in Group 3. Cell infiltration under the epithelial layers was still observed in some of the Group 3, although the wound was covered with epithelium, and the new bone covering the extraction wound was formed 38 days later. Healing was prolonged in Group 3, as compared with that in Group 2.

  5. Transforming growth factor beta 1 expression and inflammatory cells in tooth extraction socket after X-ray irradiation

    Ramadhan Hardani Putra

    2017-02-01

    Full Text Available Background: Radiographic examination is often used in dentistry to evaluate tooth extraction complications. X-ray used in radiographic examination, however, has negative effects, including damage to DNA and inflammatory response during wound healing process. Purpose: This study aimed to analyze the effects of X-ray irradiation on transforming growth factor beta 1 (TGF-ß1 expression and number of inflammatory cells in tooth extraction sockets. Method: Thirty rats were divided into three groups, which consist of control group (with a radiation of 0 mSv, treatment group 1 (with a radiation of 0.08 mSv, and treatment group 2 (with a radiation of 0.16 mSv. These rats in each group were sacrificed on days 3 and 5 after treatment. Inflammatory cells which were observed in this research were PMN, macrophages, and lymphocytes. Histopathological and immunohistochemical examinations were used to calculate the number of inflammatory cells and TGF-ß1 expression. Obtained data were analyzed using SPSS 16.0 software with one way ANOVA and Tukey’s HSD tests. Result: There was no significant decrease in the number of PMN. On the other hand, there were significant decreases in the number of macrophages and lymphocytes in the sacrificed group on day-5 with the radiation of 0.16 mSv. Similarly, the most significant decreased expression of TGF-ß1 was found in the group sacrificed on day 5 with the radiation of 0.16 mSv. Conclusion: X-ray irradiation with 0.08 mSv and 0.16 mSv doses can decrease TGF-ß1 expression and number of inflammatory cells in tooth extraction sockets on day 3 and 5 post extraction.

  6. Extraction of primary canine tooth buds: prevalence and associated dental abnormalities in a group of Ethiopian Jewish children.

    Holan, G; Mamber, E

    1994-03-01

    Recent publications have described a common belief, held in rural areas in Africa, that unerupted primary canines cause diarrhoea, vomiting and fever in infants. To relieve these symptoms a traditional native healer extracts these tooth buds. The emigration of Ethiopian Jews to Israel in 1991 allowed an investigation of this practice among this community. A group of 59 children (27 boys and 32 girls) aged 3-12 years were examined clinically and radiographically. Evidence was found of extraction of 63 primary canine buds in 35 (59%) of the children. Extraction of one canine was found in 16 children, two in 13 children and three in three children, and three children had all four canines extracted. Forty-six (74%) mandibular compared to only 16 (26%) maxillary canines had been extracted; the extractions were equally divided between both sides of the jaws. Another 19 primary canines had hypoplastic defects, probably the result of unsuccessful extractions. Associated dental abnormalities included hypoplasia of the permanent successors and adjacent primary and permanent teeth, displacement of permanent teeth, midline shift to the extraction side, missing primary lateral incisors (probably accidentally extracted) and distal eruption of permanent lateral incisors, leaving their primary predecessors retained. Parental enquiry revealed that the practice is more common in rural rather than urban areas and still exists in the Ethiopian community in Israel. The findings of this survey should urge the authorities to take steps to stop this practice.

  7. Clinical study of tooth extraction in patients with cardiovascular diseases%心血管病患者拔牙的临床分析及治疗

    尚君兰; 孙明磊

    2011-01-01

    Objective To investigate the clinical experience and methods of enhancing the safety of tooth extraction for patients with cardiovascular disease. Methods Two hundred and fifty-six patients with cardiovascular disease needing tooth extraction were selected. Results All the patients completed tooth extraction successfully. The fear and heart rate increasing took place in 26 cases. Blood pressure elevated temporarily in 6 cases during the tooth extraction. No patient had severed complication.Conclusions Patients with cardiovascular diseases have risk in tooth extraction. While the safety of tooth extraction for these patients could be enhanced by strict case screening, effective psychotherapy pre-operation, keeping emotion stability, good anaesthesia during the operation, perfect technique of tooth extraction and careful observation post-operation.%目的 探讨提高心血管疾病患者拔牙安全性的措施.方法 回顾性分析256例心血管疾病患者拔牙的临床资料.结果 本组256例心血管病患者拔牙均顺利完成,仅26例术中出现恐惧、心率加快,6例出现暂时血压升高,对症处理后缓解,无严重并发症发生.结论 心血管疾病患者拔牙术前充分心理辅导,术中麻醉确切、手术操作快速准确和术后观察可有效防止并发症的发生.

  8. Experimental study on the radiation hazard of the mandible. On the influence of tooth extraction as a mandibular hazard

    Sakurai, Tohru

    1987-06-01

    The purpose of this study is to investigate the influence of the tooth extraction after irradiation to the mandible experimentally. The following results were obtained. 1. In a group whose teeth were extracted immediately after irradiation, healing of the extraction wound was delayed. However, severe radiation hazard was not recognized macroscopically. 2. In a group whose teeth were extracted after 2 weeks following irradiation, radiation osteomyelitis was recognized macroscopically. All of these cases showed disturbances of healing of the extraction wound. 3. The early radiographical finding on the mandible, in which the teeth had been extracted after irradiation, was osteoporosis and it was accelerated by infection. 4. Bone resorption caused by osteoclast was observed microscopically in a group whose teeth were extracted after irradiation. Osteoporotic bone resorption was accelerated by infection, and was decreased by subsidings of infection and blood vessel hazard. 5. Sequestration was one of the results of radiation osteomyelitis, which was caused by the disturbance of blood circulation due to periosteum detachment. Sequestrum was caused by invasion of the healthy gingiva. 6. Though healing of the extraction wound was delayed by irradiation, new bone was formed in the alveolar socket if the blood clot occupied the alveolar socket. 7. Radiation hazard of the mandible became more severe when the mandible was accompanied by infection. (J.P.N.).

  9. Fabrication and anti-microbial evaluation of drug loaded polylactide space filler intended for ridge preservation following tooth extraction

    Nebu George Thomas

    2011-01-01

    Full Text Available Background: The preservation or reduction of alveolar ridge resorption following tooth extraction is important in patients especially for those intended for implants at a later stage. One way to achieve this is by using membranes, graft materials, and biodegradable space fillers to prevent alveolar bone resorption and promote regeneration. A major attraction for using biodegradable and biocompatible polymers as space fillers for ridge preservation is their safety profile in comparison to xenograft materials like lyophilized bone and collagen. Materials and Methods: Biocompatible polylactide space fillers were fabricated by fusing porous polylactide particles. The sponges were loaded with drugs by placing them in the respective solutions. Pseudomonas aeruginosa was isolated from a chronic periodontitis patient and in vitro anti-microbial evaluation was done with the drug loaded sponges. Results: Chlorhexidine loaded space filler showed significant anti microbial effect against multiple drug resistant Pseudomonas aeruginosa isolated from a patient with chronic periodontitis. Conclusion: The results of this study indicate that biodegradable drug releasing polylactide space fillers has the potential to be used for ridge preservation following tooth extraction. Release of drugs in the socket may prove useful in preventing development of alveolar osteitis post extraction which can interfere with normal healing of the socket. Synthetic biodegradable polymers also exhibit a controlled degradation rate to achieve complete resorption within the intended time.

  10. 微创拔牙技术在阻生齿拔除中的临床应用%Clinical Application of Atraumatic Tooth Extraction in Extraction of Impacted Tooth

    李建民; 赵庆扬; 谢伟珍; 乔春暖; 晋素丽; 汪莉; 曾雨新

    2012-01-01

    目的 观察微创拔牙刀结合高速涡轮牙钻拔牙法在阻生齿拔除术中的实际运用效果,通过临床应用,以期达到使用微创拔牙术拔除阻生齿优于常规拔牙术的目标.方法 选择需要拔除阻生智齿的患者160例,随机分成两组,每组80例,分别用Original luxato微创拔牙刀结合高速轮牙钻去冠和常规拔牙器械拔除,比较每组的断根率、拔牙窝完整性,畏惧、肿胀的差异.结果 微创拔牙刀与高速涡轮牙钻组的断根率、拔牙窝的不完整率、畏惧率、术后肿胀率明显低于传统组(P<0.05).结论 微创拔牙刀结合高速涡轮牙钻拔除阻生齿,可达到无痛、安全、微创的目的.对于恐惧拔牙、较难拔除的患牙及年老体弱或患有心血管疾病的患者,有了更好的手术方法选择.因此,在临床上具有很好的使用价值.%Objective To observe the practical clinical application effect of the Luxator extraction instruments combined with high-speed turbine dental drills in the extraction of impacted tooth. Methods Total 160 patients undergoing the removal of impacted wisdom tooth were randomly divided into two groups with 80 cases in each group. Group A were treated by using the Luxator extraction instruments combined with high-speed turbine dental drills, Group B using the traditional tooth extraction with traditional instruments. The difference in root fracture rate, integrity of the extraction socket, postoperative swelling incidence rate and the patients' terror were compared. Results The difference in root fracture rate,integrity of the extraction socket,postoperative swelling incidence rate and the palients' terror of group A were obviously lower than those of group B (P < 0. 05 ) . Conclusion The Luxator extraction instruments combined with high-speed turbine dental drills is with superiority in painlessness, safety and minimally invasive. There is better surgical option for patients who fear of tooth extraction

  11. Comparison of dexmedetomidine/fentanyl with midazolam/fentanyl combination for sedation and analgesia during tooth extraction.

    Yu, C; Li, S; Deng, F; Yao, Y; Qian, L

    2014-09-01

    Dexmedetomidine is an α2-adrenergic receptor agonist that causes minimal respiratory depression compared with alternative drugs. This study investigated whether combined dexmedetomidine/fentanyl offered better sedation and analgesia than midazolam/fentanyl in dental surgery. Sixty patients scheduled for unilateral impacted tooth extraction were randomly assigned to receive either dexmedetomidine and fentanyl (D/F) or midazolam and fentanyl (M/F). Recorded variables were patient preoperative anxiety scores, vital signs, visual analogue scale (VAS) pain scores, Observer's Assessment of Alertness/Sedation Scale (OAAS) scores after drug administration, surgeon and patient degree of satisfaction, and the duration of analgesia after surgery. The OAAS scores were significantly lower for patients administered D/F compared to those who received M/F. The duration of analgesia after the surgical procedure was significantly longer in patients who received D/F (5.3 h) than in those who received M/F (4.1 h; P=0.017). The number of surgeons satisfied with the level of sedation/analgesia provided by D/F was significantly higher than for M/F (P=0.001). Therefore, dexmedetomidine/fentanyl appears to provide better sedation, stable haemodynamics, surgeon satisfaction, and postoperative analgesia than midazolam/fentanyl during office-based unilateral impacted tooth extraction.

  12. Clinical safety and efficacy of implantation of octacalcium phosphate collagen composites in tooth extraction sockets and cyst holes

    Tadashi Kawai

    2016-09-01

    Full Text Available It was demonstrated that octacalcium phosphate collagen composite achieved notable bone regeneration in bone defects in preclinical studies. On the basis of the research results, an investigator-initiated exploratory clinical trial was conducted after approval from a local Institutional Review Board. This clinical study was performed as a single-arm non-randomized intervention study. Octacalcium phosphate collagen composite was implanted into a total of 10 cases of alveolar bone defects after tooth extractions and cystectomy. Safety assessment was performed in terms of the clinical course and several consecutive laboratory examinations, and sequential radiographs were used for efficacy assessment. All participants uneventfully completed the clinical trial without major problems in their general condition. Postoperative wound swelling was observed, as also commonly seen in tooth extraction or cystectomy. Although no serious liver dysfunction, renal dysfunction, electrolyte imbalance, or abnormal urinalysis results were recognized, the number of white blood cells and C-reactive protein level temporarily increased after the operation. An increase in radiopacity in the octacalcium phosphate collagen composite–implanted site was observed in all cases. Finally, the border between the original bone and the octacalcium phosphate collagen composite–implanted site became indistinguishable. These results suggest that octacalcium phosphate collagen composite could be utilized safely in clinical situations in the future.

  13. Temporal expression in rats of receptor tyrosine kinase Tie2 during early wound healing after tooth extraction.

    Sato, Hirotaka; Kasai, Shuya; Maesawa, Chihaya

    2015-01-01

    We examined the role of Tie2 in regulating wound healing after tooth extraction. Wistar rats underwent maxillary incisor tooth extraction, and immunodetection techniques were used to determine Tie2 expression in the healing wound. The wound was initially filled with blood coagulum containing densely aggregated erythrocytes, leukocytes, fibrin, and endothelial progenitor cells, indicating that blood vessel formation started in the socket. Tie2 was detected on monocytic cell membranes. On day 3, fibroblastic cells proliferated in the coagulum, small vessels appeared by day 5, and new bone formed in the vessel-rich area. Robust woven bone trabeculae were present around vessels by day 7, and woven bone and osteoclast-like giant cells were present on day 10. Woven bone surrounded sinusoidal capillary-like vessels. Full-length (140-160 kDa) Tie2 was not detected at any time, although Tie2 fragments were present in the healing wound. N-terminus- and C-terminus-specific Tie2 antibodies detected 40-kDa and 60-kDa fragments or 70-kDa and 50-kDa fragments, respectively. The levels of these fragments decreased during the first 3 days and started to increase by day 5-10. The Tie2 extracellular domain initially inhibited angiogenesis, and its degradation relieved inhibition of new vessel formation. The onset of vessel formation in the wound may be induced by scattered endothelial progenitor cells.

  14. Application of micro-power system in the surgery of tooth extraction%微动力系统在牙拔除术中的应用

    胡开进; 李永锋; 吴迪

    2015-01-01

    牙拔除术是口腔外科最基本的治疗操作,但传统使用骨凿、骨锤等拔牙工具的方法不仅创伤大、并发症多,还易增加患者紧张、恐惧心理。近年来,随着微创理念的发展和技术的进步,各种微动力设备开始应用于牙拔除术,这些设施既能减少拔牙创伤、降低拔牙并发症,还可极大地减轻患者的身心压力,从而弥补了传统拔牙器械的不足并逐渐取代了传统拔牙工具。由于各种微动力系统具有不同的优势和缺陷,在操作过程中还需一些辅助设备。本文将针对各种微动力系统在牙拔除术中应用的优缺点和辅助设备的选择和使用方法进行阐述,为临床上如何选择和应用微动力系统提供参考。%Tooth extraction is a common operation in oral surgery. Traditional extraction instruments, such as bone chisel, elevator, and bone hammer, lead to not only severe trauma but also unnecessary complications, and patients easily become nervous and apprehensive if tooth extraction is performed using these violent instruments. In recent years, with the develop-ment of minimally invasive concept and technology, various micro-power instruments have been used for tooth extraction. This innovative technology can reduce the iatrogenic trauma and complications of tooth extraction. Additionally, this techno-logy can greatly decrease the patient’s physical and mental pressure. The new equipment compensates for the deficiency of traditional tooth extraction equipment and facilitates the gradual replacement of the latter. Diverse micro-power systems have distinct strengths and weaknesses, so some auxiliary instruments are still needed during tooth extraction. This paper focuses on the various micro-power systems for tooth extraction and tries to compare the advantages and disadvantages of these systems. Selection and usage of auxiliary equipment are also introduced. Thus, this paper provides reference for the

  15. Nursing of 934 cases of tooth extraction under the monitoring of electrocardiogram%心电监护拔牙护理934例分析

    廖学娟; 赵佛容

    2012-01-01

    Objective To investigate the effect, complication and nursing key of tooth extraction under the monitoring of electrocardiogram. Methods 934 cases of tooth extraction accompanying with angiocardiopathy were treated under the monitoring of electrocardiogram. All the patients were nursed in all the management. Results Among the 934 cases, there was no any complication in 913 cases. There were some complications, such as high blood pressure, T wave changes, in 21 cases. Tooth extractions were finished after the patients had been given drugs and the symptom had disappeared. Conclusion Tooth extraction under the monitoring of electrocardiogram provides a safe and effective method for the patients of angiocardiopathy who need tooth extraction. Nursing is an important part of tooth extraction under the monitoring of electrocardiogram and helpful to decrease the danger of operation.%目的 探讨心电监护拔牙的手术效果、安全性及其护理要点.方法 对934例需拔牙的心血管疾病患者在心电监护下拔牙,全程对患者进行护理和宣教.结果 纳入本研究的934例患者中,913例顺利完成拔牙,2l例发生血压升高、T波改变等,用药后缓解,并完成拔牙.结论 心电监护拔牙为需拔牙的心血管疾病患者提供了一种安全有效的拔牙方法;护理是心电监护拔牙的重要组成部分,对降低手术风险具有积极的意义.

  16. Incidence of bisphosphonate-related osteonecrosis of the jaw in high-risk patients undergoing surgical tooth extraction.

    Bodem, Jens Philipp; Kargus, Steffen; Eckstein, Stefanie; Saure, Daniel; Engel, Michael; Hoffmann, Jürgen; Freudlsperger, Christian

    2015-05-01

    As the most suitable approach for preventing bisphosphonate-related osteonecrosis of the jaw (BRONJ) in patients undergoing surgical tooth extraction is still under discussion, the present study evaluates the incidence of BRONJ after surgical tooth extraction using a standardized surgical protocol in combination with an adjuvant perioperative treatment setting in patients who are at high-risk for developing BRONJ. High-risk patients were defined as patients who received intravenous bisphosphonate (BP) due to a malignant disease. All teeth were removed using a standardized surgical protocol. The perioperative adjuvant treatment included intravenous antibiotic prophylaxis starting at least 24 h before surgery, a gastric feeding tube and mouth rinses with chlorhexidine (0.12%) three times a day. In the follow-up period patients were examined every 4 weeks for the development of BRONJ. Minimum follow-up was 12 weeks. In 61 patients a total number of 184 teeth were removed from 102 separate extraction sites. In eight patients (13.1%) BRONJ developed during the follow-up. A higher risk for developing BRONJ was found in patients where an additional osteotomy was necessary (21.4% vs. 8.0%; p = 0.0577), especially for an osteotomy of the mandible (33.3% vs. 7.3%; p = 0.0268). Parameters including duration of intravenous antibiotic prophylaxis, the use of a gastric feeding tube and the duration of intravenous BP therapy showed no statistical impact on the development of BRONJ. Furthermore, patients currently undergoing intravenous BP therapy showed no higher risk for BRONJ compared with patients who have paused or completed their intravenous BP therapy (p = 0.4232). This study presents a protocol for surgical tooth extraction in high-risk BP patients in combination with a perioperative adjuvant treatment setting, which reduced the risk for postoperative BRONJ to a minimum. However, the risk for BRONJ increases significantly if an additional osteotomy is necessary

  17. Dentinal Tubule Disinfection with Propolis & Two Extracts of Azadirachta indica Against Candida albicans Biofilm Formed on Tooth Substrate

    Joy Sinha, Dakshita; Garg, Paridhi; Verma, Anurag; Malik, Vibha; Maccune, Edgar Richard; Vasudeva, Agrima

    2015-01-01

    Aim: This study evaluates the disinfection of dentinal tubules using Propolis, Azadirachta indica (alcoholic and aqueous extracts), 2% chlorhexidine gel and calcium hydroxide against Candida albicans biofilm formed on tooth substrate. Materials & Method: One hundred and five human teeth were infected with Candida albicans for 2 days. Samples were divided into 7 groups. Group I- Propolis, Group II- Alcoholic extract of Azadirachta indica, Group III- Aqueous extract of Azadirachta indica, Group IV- 2% Chlorhexidine, Group V- Calcium hydroxide, Group VI- Ethanol and Group VII- Saline (negative control). At the end of 1,3 and 5 days, the antimicrobial efficacy of medicaments against Candida albicans was assessed at the depths of 200 µm and 400 µm. Results: The overall percentage inhibition of fungal growth (at 200 µm and 400 µm depth) was 99.2% with 2% chlorhexidine gel. There was no statistical difference between propolis, alcoholic extract of Azadirachta indica (neem) and 2% chlorhexidine. Conclusion: Propolis and alcoholic extract of Azadirachta indica performed equally well as that of 2% Chlorhexidine. PMID:26962368

  18. Effect of Beta-Blockers on Number of Osteoblasts and Osteoclasts in Alveolar Socket Following Tooth Extraction in Wistar Rats

    Sadr, Katayoun; Aghbali, Amirala; Sadr, Makan; Abachizadeh, Hamed; Azizi, Maryam; Mesgari Abbasi, Mehran

    2017-01-01

    Statement of the Problem: Various researchers have suggested the use of β2-adrenergic receptor antagonists in prevention or treatment of bone resorption. Purpose: This study aimed to evaluate the effect of β2-adrenergic receptor antagonists on number of osteoclasts and osteoblasts involved in the healing of extraction socket of maxillary first molar in rats. Materials and Method: Maxillary first molars of 40 rats were extracted and divided into two groups. The test group received 0.1 mg/kg propranolol intraperitoneally daily. The controls received normal saline. At days 7, 14, 21 and 28 post-extraction, 5 rats were euthanized from each group. Maxillary bone was resected and the mean number of osteoblasts and osteoclasts in tooth socket was measured. Results: After 1 week, the number of osteoclasts in the controls was significantly higher than the test group. A significant increase in the number of osteoclasts in both groups at week 1 was observed compared to the following weeks (p< 0.05). The number of osteoblasts in the controls at second week reached its maximum rate but stayed constant in the 3rd and 4th weeks. Osteoblasts in the test group increased similar to the controls but reached its maximum at 3rd week and showed a significant increase compared to the controls (p< 0.05). Conclusion: β2 adrenergic receptor antagonists decrease the number of osteoclasts and increase the number of osteoblasts during extraction socket healing. PMID:28280758

  19. Effect of Beta-Blockers on Number of Osteoblasts and Osteoclasts in Alveolar Socket Following Tooth Extraction in Wistar Rats

    Katayoun Sadr

    2017-03-01

    Full Text Available Statement of the Problem: Various researchers have suggested the use of β2-adrenergic receptor antagonists in prevention or treatment of bone resorption. Purpose: This study aimed to evaluate the effect of β2-adrenergic receptor antagonists on number of osteoclasts and osteoblasts involved in the healing of extraction socket of maxillary first molar in rats. Materials and Method: Maxillary first molars of 40 rats were extracted and divided into two groups. The test group received 0.1 mg/kg propranolol intraperitoneally daily. The controls received normal saline. At days 7, 14, 21 and 28 post-extraction, 5 rats were euthanized from each group. Maxillary bone was resected and the mean number of osteoblasts and osteoclasts in tooth socket was measured. Results: After 1 week, the number of osteoclasts in the controls was significantly higher than the test group. A significant increase in the number of osteoclasts in both groups at week 1 was observed compared to the following weeks (p< 0.05. The number of osteoblasts in the controls at second week reached its maximum rate but stayed constant in the 3rd and 4th weeks. Osteoblasts in the test group increased similar to the controls but reached its maximum at 3rd week and showed a significant increase compared to the controls (p< 0.05. Conclusion: β2 adrenergic receptor antagonists decrease the number of osteoclasts and increase the number of osteoblasts during extraction socket healing.

  20. Oral health-related quality of life following non-surgical (routine tooth extraction: A pilot study

    Wasiu L Adeyemo

    2012-01-01

    Full Text Available Aim: The study was designed to explore the changes in oral health-related quality of life (QoL in the immediate postoperative period following routine (non-surgical dental extraction. Setting and Design: A prospective study carried out at the Oral and Maxillofacial Surgery clinic of the Lagos University Teaching Hospital, Nigeria. Materials and Methods: Subjects attending who required non-surgical removal of one or two teeth under local anesthesia were included in the study. A baseline QoL questionnaire (oral health impact profile-14 [OHIP-14] was filled by each patient just before surgery, and only those who were considered to have their QoL "not affected" (total score 14 or less were included in the study. After the extraction, each subject was given a modified form of "health related QoL" [OHIP-14]-instrument to be completed by the 3 rd day-after surgery, and were given the opportunity to review the questionnaire on the 7 th day postoperative review. Results: Total OHIP-14 scores ranged between 14 and 48 (mean ± SD, 26.2 ± 8.3. Majority of the subjects (60% reported, "a little affected." Only few subjects (5.8% reported, "not at all affected," and about 32% reported, "quite a lot." Summation of OHIP-14 scores revealed that QoL was "affected" in 41 subjects (34.2% and "not affected" in 79 subjects (65.8%. More than 30% of subjects reported that their ability to chew, ability to open the mouth and enjoyment of food were affected following tooth extraction. Few subjects (14-34% reported deterioration in their speech and less than 20% of subjects reported that change in their appearance was "affected." Only few subjects (12.5-15.1% reported sleep and duty impairment. Thirty-percent of subjects reported their inability to keep social activities, and 41% were not able to continue with their favorite sports and hobbies. Multiple regression analysis revealed no significant association between age, sex, indications for extraction, duration of

  1. Minimally invasive tooth extraction in mandibular wisdom tooth extraction nearly in the clinical study.%微创拔牙法在下颌近中阻生智齿拔除术中的临床应用

    黎钢; 雷荣昌; 郭宏剑; 梁非照; 马文涛

    2011-01-01

    目的:观察微创拔牙刀结合高速涡轮牙钻拔牙法在下颌近中阻生智齿拔除术中的临床应用效果.方法:选择需要拔除的下颌近中阻生智齿120例,随机分为两组,每组60例,分别用Original Luxato微创拔牙刀结合高速涡轮牙钻去冠和传统拔牙器械拔除患牙,比较两组的牙科畏惧症发生率及手术时间、术后患者张口度、肿胀度、疼痛、满意度、拔牙窝完整性的差异.结果:微创拔牙刀结合高速涡轮牙钻去冠组患者的牙科畏惧症发生率明显低于传统拔牙组,手术效果明显优于传统组,两组的差异具有统计学意义(P<0.05).结论:微创拔牙刀结合高速涡轮牙钻去冠拔除下颌近中阻生智齿可达到无痛、安全、微创的目的.%Objective:To observe the minimally invasive dentistry knife combined with high speed turbine drill extraction method in mandibular near impacted in clinical applications. Method: Select the clinical needs for extraction of mandibular impacted wisdom teeth nearly 120 cases were randomly divided into two groups, each group 60 cases, respectively Original Luxato minimally invasive extraction combined with high-speed turbine blade and traditional extraction equipment to remove crown teeth,comparing the two Group rates and fear of operation time, postoperative mouth opening,swelling, pain, satisfaction,teeth extraction integrity. Result: Minimally invasive extraction knife combined with high-speed turbine to crown the fear of patients was significantly lower than traditional extraction group, surgery is better than the traditional group, statistically significant differences between the two groups (P <0.05). Conclusion: Minimally invasive extraction combined with high-speed turbine blade to the highest close in the extraction of impacted mandibular third molar can be achieved painless, safe, minimally invasive purpose,worth close to the impacted mandibular tooth extraction surgery in the popularization

  2. 拔牙后出血的影响因素与治疗研究%Study on the influencing factors and treatment of bleeding after tooth extraction

    钟守鹏

    2016-01-01

    Objective:To explore the influencing factors and treatment of bleeding after tooth extraction.Methods:The clinical data of 35 cases of patients with bleeding after tooth extraction were analyzed retrospectively,and the influencing factors and corresponding treatment measures were analyzed.Results:The influencing factors of bleeding after tooth extraction included 5 cases of systemic hemorrhage,30 cases of local bleeding.Conclusion:Systemic factors,local factors and other factors were the main causes of bleeding after tooth extraction.The basic situation of patients should be understood before the operation in order to avoid postoperative bleeding.%目的:探讨拔牙后出血的影响因素与治疗方法。方法:回顾性分析拔牙后出血患者35例的临床资料,分析拔牙后出血的影响因素及相应的治疗措施。结果:拔牙后出血的影响因素包括全身出血5例,局部出血30例。结论:全身因素、局部因素及其他因素是引起拔牙后出血的主要原因。术前一定要了解患者基本情况,避免术后出血。

  3. 拔牙术后出血120例原因分析%Analysis of causes of tooth extraction postoperative bleeding

    刘韬

    2013-01-01

    Objective To explore the causes of bleeding after tooth extraction,and provide clinical preventive interventions for the occurrence of bleeding after tooth extraction.Methods 120 cases of bleeding after tooth extraction patients were selected as research subjects,their clinical data were retrospectively analyzed.Results The location of bleeding after tooth extraction analysis were as following:bleeding mandibular molar proportion of 46.7% ;maxillary molar tooth bleeding proportion of 36.6% ; anterior mandibular molar tooth bleeding after the proportion 6.7 % ;maxillary premolar bleeding proportion was 5.8% ;the anterior mandible proportion of 2.5 % ;the anterior maxilla proportion 1.7% ;extraction postoperative bleeding time more concentrated within 8 hours after surgery,65.0% ;occur 15.8% in the proportion of 8 to 12 hours after surgery;14.2% in the proportion of 13 to 24 hours after surgery;bleeding time of over 24 hours compared to 5.0% ;retrospective analysis found the cause of the bleeding,gingival the tissue tearing lead to bleeding the proportion of 41.7% ; extraction sockets tissue residues cause bleeding ratio of 15.0% ;sutures become loose resulting in bleeding was 4.2% ;alveolar bone fracture cause bleeding ratio of 13.3% ;tooth fossa vascular ruptured bleeding ratio of 9.2%.Conclusion After tooth extraction bleeding occurred within 8h after surgery,to mandibular teeth bit bleeding is the most common,cause more bleeding after tooth extraction,strictly regulate the operation for bleeding has an important role in the prevention of tooth extraction.%目的 探讨拔牙术后出血的相关原因,为临床预防提供干预措施.方法 对120例拔牙后出血患者的临床资料进行回顾性分析.结果 患牙位置:下颌磨牙出血46.7%,上颌磨牙出血36.6%,下颌前磨牙出血6.7%,上颌前磨牙出血5.8%,下颌前牙出血2.5%,上颌前牙出血1.7%.拔牙术后出血时间:<8 h 65.0%,8~12 h 15

  4. Root resection under the surgical field employed for extraction of impacted tooth and management of external resorption

    A R Vivekananda Pai

    2012-01-01

    Full Text Available This case report illustrates determination of prognosis and immediate resection carried out, before completing the endodontic therapy, during the surgery employed for managing a nonperiodontal problem. This case showed external pressure resorption in the distobuccal root of maxillary second molar caused by the impingement of impacted third molar. Extraction of third molar was decided when healing was not seen, despite initiating endodontic therapy in second molar. Following elevation of flap and extraction of third molar, the poor prognosis due to severe bone loss around the resorbed root was evident. But due to strategic value of second molar, it was found beneficial to employ resection. Therefore, immediate resection was carried out in the same surgical field before the completion of endodontic therapy. This prevented the need for another surgical entry with its associated trauma to carry out resection separately later. Resection followed by the completion of endodontic therapy and full crown assisted in salvaging the remaining functional portion of the tooth and prevented the occurrence of distal extension with its potential drawbacks.

  5. 拔牙创使用人羊膜的临床研究%Clinical Application of the Human Amniotic Membrane in Tooth Extraction Wound

    翟幼文; 汪文丰; 黄啸林; 梁向新; 王鑫

    2015-01-01

    目的:观察人羊膜植入临床拔牙创后对牙槽骨愈合的影响.方法:选用来本院需拔除双侧下颌第二前磨牙正畸治疗的患者20例,右侧拔牙创植入人羊膜作为试验组,左侧拔牙创作为空白对照.术后1、2、3个月拍口腔全景片,观察新骨形成情况及牙槽嵴吸收评价拔牙创愈合情况.结果:术后1周牙龈愈合及术后1、2、3个月拔牙创新骨形成量试验组优于对照组,术后1、2、3个月牙槽嵴吸收高度试验组均明显低于对照组(P0.01).结论:临床拔牙创植入人羊膜能促进拔牙创的早期愈合,保存牙槽嵴高度.%Objective:To observe the effect of human amniotic membrane planted in tooth extraction wound in the knitting of alveolar bone.Method:20 patients who need to extract the two lower second premolars because of orthodontic treatment in our department were chosen. The right side were considered as the experimental group with the human amniotic membrane implanted in tooth extraction wound, and the left as blank control group. Then the condition of knitting after tooth extraction and the absorption of alveolar bone were observed by taking oral panoramic pieces respectively in the first,second and third months,to evaluate the knitting of the tooth extraction wound.Result:The healing of the gingiva in the experimental group was better than in the control group one week after the operation.The same happened in the new bone formation in the tooth extraction wound.The height of alveolar ridge absorbed in experimental group were significantly lower than control group in the 1st, 2nd, 3rd month(P0.01).Conclusion:Human amnion can promote the healing of tooth extraction wound in early days and keep the height of alveolar ridge.

  6. The Effectiveness of a New Hemostatic Agent (Ankaferd Blood Stopper for the Control of Bleeding following Tooth Extraction in Hemophilia: A Controlled Clinical Trial

    Hakkı Oğuz Kazancıoğlu

    2013-03-01

    Full Text Available Objective: To assess the hemostatic efficacy of a new local hemostatic agent, Ankaferd Blood Stopper (ABS, for the control of bleeding following tooth extraction in hemophiliacs. Materials and Methods: Simple tooth extractions were performed in 27 hemophilia A patients. In the treatment group (n=17 local hemostasis was achieved via application of ABS to the extraction sockets, whereas in the control group (n=10 local hemostasis was achieved via direct packing with gauze. Results: In all, 57 (21 primary and 36 permanent teeth extractions were performed in 27 hemophilia A patients. There were no significant differences in age or factor VIII level distribution between the 2 groups (p>0.05. The most significant clinical difference between the groups was associated with the use of ABS; those in the treatment group had significantly shorter duration of bleeding (p=0.002. Conclusion: This is the first study to evaluate the efficacy of ABS for the control of bleeding following tooth extraction in hemophiliacs. ABS can be considered an alternative local hemostatic agent for reducing clotting factor concentrates in hemophilia patients.

  7. Histomorphometric evaluation of the effect of systemic and topical ozone on alveolar bone healing following tooth extraction in rats.

    Erdemci, F; Gunaydin, Y; Sencimen, M; Bassorgun, I; Ozler, M; Oter, S; Gulses, A; Gunal, A; Sezgin, S; Bayar, G R; Dogan, N; Gider, I K

    2014-06-01

    The aim of this study was to investigate the effects of systemic and topical ozone applications on alveolar bone healing following tooth extraction. One hundred and twelve male Wistar rats were divided into eight groups of 14 rats each; seven groups were experimental (A-G) and one formed the control group (K). The experimental groups were further divided into two sub-groups, with seven rats in each - sacrificed on days 14 and 28 (subgroups 1 and 2). The maxillary right central incisors were extracted under general anaesthesia following the administration of local anaesthesia. After sacrifice, semi-serial histological sections were prepared, and mineralized and trabecular bone and osteoid and osteoblast surfaces were measured. Measurements of the trabecular bone showed statistically higher values in the groups treated with systemic ozone (D(2): 50.01 ± 2.12; E(2): 49.03 ± 3.03; F(2): 48.76 ± 2.61; G(2): 50.24 ± 3.37) than in the groups that underwent topical ozone administration (A(2): 46.01 ± 3.07; B(2): 46.79 ± 3.09; C(2): 47.07 ± 2.12; P = 0.030 (G(2)-A(2), G(2)-B(2), G(2)-C(2))). Within the limitations of the current study, it may be concluded that postoperative long-term systemic ozone application can accelerate alveolar bone healing following extraction. However, additional studies are required to clarify the effects of the different ozone applications on new bone formation.

  8. The effect of caffeine on osteoblast proliferation after tooth extraction in Wistar rats

    Budi Yuwono

    2006-03-01

    Full Text Available Caffeine is the most well-known substance which consumed by most people daily. Behind its popularity as favorable drinks and food, this substance also known can inhibit the post extraction wound healing by decreasing the proliferation of osteoblast cells through the increase of intracellular cyclic Adenosine Mono Phosphate (cAMP. The objective of this study was done to observe the effect of caffeine intake toward the number of osteoblast cells during the wound healing of post dental extraction in Wistar’s rats. This study was an experimental laboratory research and the post test-only control group design was used for the statistical evaluation. The samples used were 24 healthy 3 months old male Wistar’s rats, with approximately 200 grams of body weight and devided into 4 groups. Three groups were taken and represented as a treated group (P and the rest of one group was used as a control group (KO. Caffeine diet with a dosage of 3.78 mg/100 ml grams of body weight/cc was given for 7 days in group P1, P2 for 14 days, and 21 days in group P3 and the diet was given orally using an oral sonde. Teeth extractions of the right first molar in the lower jaw were done in all groups according to the interval time had been scheduled. Seven days of post-extraction time was waiting in all groups before the sample being decapitated for further histological examination in the post extracted sites. A Hematoxillin and Eosin staining was used and the number of osteoblast cells were counted under light microscopy with 400 times magnification. One-way ANOVA and Least Significant Difference (LSD test were used for the statistical evaluation. The result of the study shown a significant decrease of the number of osteoblast cells in caffeine consumed group of 7, 14, and 21 days observed (p < 0.05. This study conclude that the duration time of caffeine consumed had been interfered significantly with the osteoblast cell proliferation during the wound healing after

  9. Use of viscera extract from hybrid catfish (Clarias macrocephalus × Clarias gariepinus) for the production of protein hydrolysate from toothed ponyfish (Gazza minuta) muscle.

    Klomklao, Sappasith; Kishimura, Hideki; Benjakul, Soottawat

    2013-01-15

    Proteolytic activity of viscera extract from hybrid catfish (Clarias macrocephalus × Clarias gariepinus) was studied. The optimal pH and temperature were 9.0 and 50°C, respectively, when toothed ponyfish (Gazza minuta) muscle was used as a substrate. When viscera extract from hybrid catfish was used for the production of protein hydrolysate from toothed ponyfish muscle, extract concentration, reaction time, and fish muscle/buffer ratio affected the hydrolysis and nitrogen recovery (NR) (p<0.05). Optimum conditions for toothed ponyfish muscle hydrolysis were 3.5% hybrid catfish viscera extract, 15 min reaction time and fish muscle/buffer ratio of 1:3 (w/v). High correlation between the degree of hydrolysis (DH) and NR (R(2)=0.974) was observed. Freeze-dried hydrolysate had a high protein content (89.02%, dry weight basis) and it was brownish yellow in colour (L(∗)=63.67, a(∗)=6.33, b(∗)=22.41). The protein hydrolysate contained a high amount of essential amino acids (48.22%) and had arginine and lysine as the dominant amino acids.

  10. An intramembranous ossification model for the in silico analysis of bone tissue formation in tooth extraction sites.

    Corredor-Gómez, Jennifer Paola; Rueda-Ramírez, Andrés Mauricio; Gamboa-Márquez, Miguel Alejandro; Torres-Rodríguez, Carolina; Cortés-Rodríguez, Carlos Julio

    2016-07-21

    The accurate modeling of biological processes allows us to predict the spatiotemporal behavior of living tissues by computer-aided (in silico) testing, a useful tool for the development of medical strategies, avoiding the expenses and potential ethical implications of in vivo experimentation. A model for bone healing in mouth would be useful for selecting proper surgical techniques in dental procedures. In this paper, the formulation and implementation of a model for Intramembranous Ossification is presented aiming to describe the complex process of bone tissue formation in tooth extraction sites. The model consists in a mathematical description of the mechanisms in which different types of cells interact, synthesize and degrade extracellular matrices under the influence of biochemical factors. Special attention is given to angiogenesis, oxygen-dependent effects and growth factor-induced apoptosis of fibroblasts. Furthermore, considering the depth-dependent vascularization of mandibular bone and its influence on bone healing, a functional description of the cell distribution on the severed periodontal ligament (PDL) is proposed. The developed model was implemented using the finite element method (FEM) and successfully validated by simulating an animal in vivo experiment on dogs reported in the literature. A good fit between model outcome and experimental data was obtained with a mean absolute error of 3.04%. The mathematical framework presented here may represent an important tool for the design of future in vitro and in vivo tests, as well as a precedent for future in silico studies on osseointegration and mechanobiology.

  11. Rare Occurrence of Herpes Zoster of Trigeminal Nerve following Extraction of Tooth

    A. Winnifred Christy

    2015-01-01

    Full Text Available Herpes Zoster also known as Shingles is an acute viral infection which is an extremely painful and incapacitating ailment. It results from the reactivation of the varicella zoster virus. The triggering factors for the onset of an attack of Herpes Zoster include some form of immunosuppression. The diagnosis of Herpes Zoster can be made on proper medical history and a thorough clinical examination. Here is the report of a male patient affected by Herpes Zoster infection which followed after extraction of a lower first molar.

  12. Tooth anatomy

    ... page: //medlineplus.gov/ency/article/002214.htm Tooth anatomy To use the sharing features on this page, ... upper jawbone is called the maxilla. Images Tooth anatomy References Lingen MW. Head and neck. In: Kumar ...

  13. Porous magnesium/PLGA composite scaffolds for enhanced bone regeneration following tooth extraction.

    Brown, Andrew; Zaky, Samer; Ray, Herbert; Sfeir, Charles

    2015-01-01

    Sixty percent of implant-supported dental prostheses require bone grafting to enhance bone quantity and quality prior to implant placement. We have developed a metallic magnesium particle/PLGA composite scaffold to overcome the limitations of currently used dental bone grafting materials. This is the first report of porous metallic magnesium/PLGA scaffolds synthesized using a solvent casting, salt leaching method. We found that incorporation of varying amounts of magnesium into the PLGA scaffolds increased the compressive strength and modulus, as well as provided a porous structure suitable for cell infiltration, as measured by mercury intrusion porosimetry. Additionally, combining basic-degrading magnesium with acidic-degrading PLGA led to an overall pH buffering effect and long-term release of magnesium over the course of a 10-week degradation assay, as measured with inductively coupled plasma-atomic emission spectroscopy. Using an indirect proliferation assay adapted from ISO 10993:5, it was found that extracts of medium from degrading magnesium/PLGA scaffolds increased bone marrow stromal cell proliferation in vitro, a phenomenon observed by other groups investigating magnesium's impact on cells. Finally, magnesium/PLGA scaffold biocompatibility was assessed in a canine socket preservation model. Micro-computed tomography and histological analysis showed the magnesium/PLGA scaffolds to be safer and more effective at preserving bone height than empty controls. Three-dimensional magnesium/PLGA composite scaffolds show promise for dental socket preservation and also, potentially, orthopedic bone regeneration. These scaffolds could decrease inflammation observed with clinically used PLGA devices, as well as enhance osteogenesis, as observed with previously studied magnesium devices.

  14. Single-Tooth Implant Restorations in Fresh Extraction Sockets of the Maxillary Esthetic Zone: Two-Year Results of a Prospective Cohort Study.

    Ganeles, Jeffrey; Norkin, Frederic J; Zfaz, Samuel

    In this prospective study, 15 patients received 15 variable-thread tapered implants placed in fresh extraction sites in the maxillary esthetic zone and immediately were provisionalized out of occlusion. Of the 15 patients, 11 completed their 2-year follow-up. At 2 years, the success and cumulative survival rates were both 100%, and the mean bone level gain was 0.83 mm. Soft tissue assessment showed no zero esthetic scores, improved papilla indices, and low bleeding on probing and plaque accumulation. Overall, the study implants showed excellent hard tissue, soft tissue, and esthetic outcomes, indicating a healthy tissue response in single-tooth extraction sites in the maxillary esthetic zone.

  15. The application of single tooth anesthesia in the tooth extraction of the elderly patients with periodontal disease%STA无痛麻醉仪在老年牙周病患者牙拔除术中的应用

    杨霞; 侯锐; 尚磊; 许广杰; 薛芃

    2015-01-01

    目的:比较新型STA无痛麻醉仪和传统手推卡局式注射器在老年牙周病患者牙周韧带注射麻醉和松动患牙拔除术中对患者血压、心率、疼痛程度、面部表情、合作程度和耐受行为的影响。方法:对52例老年牙周病患者的104颗松动牙采用随机、双盲、自身对照的方法进行研究。在局部麻醉时使用新型STA无痛麻醉仪(试验组)和卡局式注射器(对照组)行牙周韧带注射,分别记录麻醉和手术时患者的血压、心率数值并进行疼痛视觉模拟量表(VAS)、 Kuttner、 Frankl和Houpt各量表的评估,收集数据进行统计分析。结果:与卡局式注射器相比,使用新型STA无痛麻醉仪局部麻醉时,老年患者的舒张压(DBP)、 VAS和Kuttner分值明显降低, Frankl和Houpt分值明显升高,差异有统计学意义(P0.05)。结论:使用新型STA无痛麻醉仪能明显减轻麻醉中老年患者的血压波动和疼痛程度、缓解面部紧张表情、提高合作程度和耐受行为。%Objective:To compare the effect of single tooth anesthesia and the traditional hand-push cartridge on the blood pressure, heart rate, pain level, facial expression, cooperation and tolerance of the elderly patients during local anesthesia and tooth extraction.Methods:Fifty-two patients had their bilateral loose teeth removed through a random, double-blind, self-controlled clinical trial in two visits. On one side single tooth anesthesia (experimental group) was used for the periodontal ligament injection. On the other side, hand-push cartridge (control group) was used the same way. Blood pressure, heart rate, Visual Analogue Scale(VAS), Kuttner facial expressions, Frankl Behavior Rating Score and Houpt Behavior Rating Scale were assessed during local anesthesia and tooth extraction. The data were collected and the statistical analyses were performed.Results:Compared with the hand-push cartridge,single tooth anesthesia could

  16. Intramembranous bone healing process subsequent to tooth extraction in mice: micro-computed tomography, histomorphometric and molecular characterization.

    Vieira, Andreia Espindola; Repeke, Carlos Eduardo; Ferreira Junior, Samuel de Barros; Colavite, Priscila Maria; Biguetti, Claudia Cristina; Oliveira, Rodrigo Cardoso; Assis, Gerson Francisco; Taga, Rumio; Trombone, Ana Paula Favaro; Garlet, Gustavo Pompermaier

    2015-01-01

    Bone tissue has a significant potential for healing, which involves a significant the interplay between bone and immune cells. While fracture healing represents a useful model to investigate endochondral bone healing, intramembranous bone healing models are yet to be developed and characterized. In this study, a micro-computed tomography, histomorphometric and molecular (RealTimePCRarray) characterization of post tooth-extraction alveolar bone healing was performed on C57Bl/6 WT mice. After the initial clot dominance (0 h), the development of a provisional immature granulation tissue is evident (7 d), characterized by marked cell proliferation, angiogenesis and inflammatory cells infiltration; associated with peaks of growth factors (BMP-2-4-7,TGFβ1,VEGFa), cytokines (TNFα, IL-10), chemokines & receptors (CXCL12, CCL25, CCR5, CXCR4), matrix (Col1a1-2, ITGA4, VTN, MMP1a) and MSCs (CD105, CD106, OCT4, NANOG, CD34, CD146) markers expression. Granulation tissue is sequentially replaced by more mature connective tissue (14 d), characterized by inflammatory infiltrate reduction along the increased bone formation, marked expression of matrix remodeling enzymes (MMP-2-9), bone formation/maturation (RUNX2, ALP, DMP1, PHEX, SOST) markers, and chemokines & receptors associated with healing (CCL2, CCL17, CCR2). No evidences of cartilage cells or tissue were observed, strengthening the intramembranous nature of bone healing. Bone microarchitecture analysis supports the evolving healing, with total tissue and bone volumes as trabecular number and thickness showing a progressive increase over time. The extraction socket healing process is considered complete (21 d) when the dental socket is filled by trabeculae bone with well-defined medullary canals; it being the expression of mature bone markers prevalent at this period. Our data confirms the intramembranous bone healing nature of the model used, revealing parallels between the gene expression profile and the

  17. Tooth in oropharynx

    D Nagarajappa

    2011-01-01

    Full Text Available The incidence of ectopic teeth has increased. In many cases, the etiology of ectopic teeth cannot be identified. Ectopic tooth in deciduous dentition period is very rare and information is limited about its causes and characteristics. The conditions commonly associated with an increased prevalence of ectopic teeth include cleft lip and palate, cleidocranial dysplasia, and Gardner syndrome. The diagnosis is made by the clinical and radiological examinations. The indication for extraction in ectopic teeth cases is in general determined by the presence of symptomatology, or by the need for preventing future complications. We present a case of an ectopic maxillary tooth in a 4 year-old boy. In addition, this report also addresses a young patient with a tooth in the oropharynx with the objective of non traumatic etiology, and such a clinical presentation is extremely rare. The authors believe the case presented here is the first documented case of an ectopic supernumerary tooth seen in the oropharynx.

  18. Tooth in oropharynx.

    Nagarajappa, D; Manjunatha, Bs

    2011-09-01

    The incidence of ectopic teeth has increased. In many cases, the etiology of ectopic teeth cannot be identified. Ectopic tooth in deciduous dentition period is very rare and information is limited about its causes and characteristics. The conditions commonly associated with an increased prevalence of ectopic teeth include cleft lip and palate, cleidocranial dysplasia, and Gardner syndrome. The diagnosis is made by the clinical and radiological examinations. The indication for extraction in ectopic teeth cases is in general determined by the presence of symptomatology, or by the need for preventing future complications. We present a case of an ectopic maxillary tooth in a 4 year-old boy. In addition, this report also addresses a young patient with a tooth in the oropharynx with the objective of non traumatic etiology, and such a clinical presentation is extremely rare. The authors believe the case presented here is the first documented case of an ectopic supernumerary tooth seen in the oropharynx.

  19. Experience in Treatment of Elderly Patients with Tooth Extraction%老年拔牙患者的治疗体会

    熊书函; 刘道华; 赖璟研

    2014-01-01

    Objective To investigate the clinical experience in treatment of elderly patients with tooth extraction. Methods A retrospective analysis of our hospital since 2010 January to 2014 June, there were 5182 cases of outpatients and inpatients in elderly patients with extraction. Results In this group, 5182 cases in 3 cases of bleeding after tooth extraction more, after thoroughly cleaning alveolar fossa, suture wound edge after cure. 121 cases of postoperative pain symptoms are obvious, the anti-inflammatory and symptomatic treatment to cure. The remaining patients with tooth extraction wound healed, no infection and other serious complications. Conclusion Ful understanding of senile systemic disease, doctors have the ability of emergency treatment, the hospital emergency treatment facilities, improve the quality of life of the elderly.%目的探讨老年拔牙患者的临床治疗体会。方法回顾性分析选择我院自2010年1月~2014年6月,共收治门诊和住院5182例老年拔牙患者。结果本组5182例中有3例拔牙术后出血较多,经再次彻底清理牙槽窝,缝合创缘后治愈。术后疼痛症状明显者121例,经抗炎对症处理后治愈。其余患者拔牙创面一期愈合,均未发生感染和其他严重并发症。结论充分了解老年全身性疾病,医生具备应急处理的能力,院方应急处理设备齐全,提高老年人的生活质量。

  20. 微创拔牙在糖尿病患者中的应用%Minimally Invasive Tooth Extraction in Diabetic Patients

    徐其章; 王晓宇; 吴鹏飞

    2014-01-01

    目的:探讨和总结微创拔牙技术在糖尿病患者中的临床应用效果。方法:2009-06-2013-06期间,采用微创拔牙技术拔除糖尿病人患牙95颗,记录术前、术中及术后1、7、14 d复诊时,患者症状及拔牙创情况。结果:术后感染2例,感染率2.35%;术中低血糖1例(1.25%);术后疼痛5例(5.88%);术后肿胀3例(3.53%)。结论:微创拔牙技术疗效可靠、操作简便,在糖尿病患者中是目前值得推广的较好拔牙方法。%Objective: To review and summarize the clinical understanding of minimally invasive tooth extraction in diabetic patients. Method: 95 teeth from 2009-06-2013-06 with the minimally invasive tooth extraction in diabetic were reviewed. Signs, symptoms, and complaints were recorded in preoperation, during operation, and 1, 7, and 14 days after operation. Results:2 patients complicated with infection. 1 case demonstrated hypoglycemia during extraction, and 3 cases experienced restriction of mouth opening. 5 cases appeared postoperative pain. Conclusion: The minimally invasive tooth extraction in diabetic patients is a reliable treatment.

  1. The effect of osteogenic inducer on healing of tooth extraction sockets%成骨诱导剂对拔牙创愈合的影响

    陈俊良; 单春城; 何芸; 夏德林

    2012-01-01

    Objective To study the effect of osteogenic inducer (dexamethasone, |J-sodium glycerophosphate and Vitamin C) carried by gelatin sponge on healing and remodeling of tooth extraction sockets. Methods Fifty rabbits were selected. After extracting the first premolars of bilateral maxillary, the right side tooth extraction sockets were filled with gelatin sponge containing osteogenie inducer as experimental side, tooth extraction sockets on left side were filled with gelatin sponge as control. Every ten rabbits were executed at the end of 1, 2, 4, 8, 12 weeks after tooth extraction. Bone density was measured through digital X-ray images. The specimens were examined by histology. The absorption height of alveolar bone at 12 weeks was measured. Results X-ray measurement showed that the bone density of experimental side was higher than that of control side at 2, 4, 8, 12 weeks, the difference had statistical significance CP<0.01). The histology examination showed that new bone formation in tooth extraction sockets of experimental side was earlier than that in control side. The absoiptional height of alveolar bone had significant difference between experimental side and control side (P<0.01), of which experimental side was less. Conclusion Filling the osteogenie inducer in tooth extraction sockets can promote the healing and new bone formation and prevent from alveolar bone absorption.%目的 探讨以明胶海绵为载体,地塞米松、维生素C和β-甘油磷酸钠组成的成骨诱导剂对拔牙创愈合和牙槽嵴形态改建的影响.方法 选用50只家兔,拔除双侧上颌第一前磨牙,右侧拔牙创内填入载有成骨诱导剂的明胶海绵,作为实验侧;左侧填入空载明胶海绵,作为对照侧.拔牙后第1、2、4、8、12周各处死10只动物,取双侧牙槽骨标本,拍摄X线片,并测量骨缺损区新骨密度;用组织学方法评价拔牙创愈合情况;并于12周时,测量拔牙区牙槽嵴高度吸收值.结果 X线片

  2. A clinical study of 156 elderly patients with hypertension receiving tooth extraction%156例老年高血压患者拔牙临床研究

    卢丽虹; 胡顺广; 魏远坚

    2014-01-01

    Objective To explore and summarize a safe and effective strategy of decreasing blood pressure for elderly patients with hypertension receiving tooth extraction. Methods Clinical data of 156 elderly patients with hypertension receiving tooth extraction were analyzed retrospectively. Patients all received medicine to control their blood pressure before tooth extraction. 76 Patients receiving nifedipine plus diazepam were allocated to an observation group, and 80 patients receiving nifedipine alone were allocated to a control group. Changes of SBP, DBP and HR before and after the treatment were compared between the two groups. Results The 156 elderly patients with hypertension successfully received tooth extraction without severe complications occurred. Decrease of SBP and DBP in the observation group was significantly greater than that in the control group, and the change of HR was smaller than that in the control group. The differences were statistically significant(P < 0.05). Conclusion Application of nifedipine combined with diazepam for elderly patients with hypertension before tooth extraction is beneficial to control peri-operative blood pressure and keep a stable heart rate, and to reduce emergencies such as severe elevation of blood pressure during peri-operative period of tooth extraction.%目的:探讨老年高血压患者拔牙安全有效的降压策略。方法回顾性分析156例拔牙治疗的老年高血压患者的临床资料,患者均在拔牙前采用药物控制性降压,将采用硝苯地平+安定者76例纳入观察组,单独应用硝苯地平者80例纳入对照组,比较两组患者治疗前后收缩压(SBP)、舒张压(DBP)及心率(HR)的变化。结果本研究156例老年高血压患者均顺利地完成了拔牙,无严重并发症发生。其中观察组SBP、DBP下降效果明显优于对照组,而心率变化小于对照组,差异均有统计学意义(P<0.05)。结论老年高血压患者拔牙前

  3. After tooth extraction plant site preservation of perioperative care%拔牙后种植位点保存的围手术期护理

    张丽

    2014-01-01

    目的:探究拔牙后种植位点保存有效的围手术期护理方式。方法:将我院拟拔牙后进行种植的患者随机分为两组,优质护理组患者采用围术期的优质护理,常规对照组的患者则采用传统的护理。结果:优质护理组患者出现术后出血、血肿、感染并发症的例数小于常规对照组患者,且优质护理组患者拔牙3个月后拔牙创的牙槽嵴更适宜种植修复。结论:科学合理的优质护理可以起到对患者拔牙后种植位点的保护作用,为种植修复提供良好的牙槽嵴条件。%Objective:explore after tooth extraction plant site keep effective perioperative nursing method. Methods:To our hospital to after tooth extraction for the cultivation of patients were randomly divided into two groups,the high quality nursing group of patients with perioperative nursing quality,normal control group of patients,the use of the traditional nursing care. Results:high quality nursing group of patients with postoperative hemorrhage,the cases of complications is less than patients with normal control group. Conclusion:scientific and reasonable quality care can rise to the protection of patients after tooth extraction plant site.

  4. 锂盐对大鼠拔牙创愈合的影响%Effects of lithium on the healing of tooth extraction sockets in rats

    付斌; 曾芸婷; 唐国华

    2012-01-01

    PURPOSE: The purpose of this study was to investigate the effect of lithium on the healing of tooth extraction sockets in rats. METHODS: 20 Wistar rats were selected and subjected to left maxillary second molar extraction. All rats were randomly divided into two groups. The experimental group received daily Lid injection intraperitoneally from 7 days before tooth extraction to 3 days after extraction. The control group was administrated the same volume of NaCl.All rats were sacrificed on 3 or 7 days after extraction.HE staining was carried out to investigate the new bone formation. BrdU was used to label the proliferative cells. The amount of proliferative cells and the volume of new bone were semi-quantified by Image-Pro Plus analysis system. The differences among the groups were analyzed by SPSS 13.0 software package. RESULTS: Mesenchymal cells proliferated in tooth extraction sockets on day 3 after tooth extraction. The number of BrdU labeled cells in the experimental group was 1.8 folds to that in the control group, which was of significant difference (P<0.05). On day 7, new bone formation extended from the bottom of the sockets. The volume of new trabecular bone was 27.0%±6.5% in the experimental group, which was significantly larger than 12.7%±5.1% in the control group (P<0.01). CONCLUSION: Early delivery of lithium increases the proliferation of mesenchymal cells and new bone formation in tooth extraction sockets in rats. Supported by Research Fund of Science and Technology Commission of Shanghai Municipality (10QH1401600),Shanghai Leading Academic Discipline Project (S30206),and Research Fund of Shanghai Municipal Education Commission(09YZ75).%目的:观察锂盐对大鼠拔牙创愈合过程中新骨形成的影响.方法:取20只Wistar大鼠,拔除左侧上颌第二磨牙,随机分为2组.实验组从拔牙前7d起至拔牙后第3天每天腹腔注射LiC1,对照组给予相同剂量NaCl.拔牙后3d、7d处死大鼠.通过HE染色定量分析新骨的

  5. Tooth Retained Implant: No More an Oxymoron

    Divya Bhat

    2011-01-01

    Introduction: Periodontally af-fected teeth are treated in one of the two ways. (1) Tooth retention after periodontal surgery, in which the degree of regeneration achieved is unpredictable. (2) Tooth extrac-tion and implant placement. Implants have an osseointegrated surface which does not provide adequate shock absorption. Regeneration can be achieved by resecting the crown of the affected tooth and submerging the root. This technique has not had a clinical application so far as the tooth be...

  6. Endodontic therapy or single tooth implant? A systematic review.

    Torabinejad, Mahmoud; Lozada, Jaime; Puterman, Israel; White, Shane N

    2008-06-01

    Should a tooth with pulpal involvement be saved through endodontic therapy, or extracted and replaced with a single tooth implant? Within the limitations of the existing literature, this systematic review of treatment outcomes found that initial endodontic treatment had a high long-term survival rate, equivalent to replacement of a missing tooth with an implant-supported restoration. Single tooth implants should be considered as the first treatment option for patients requiring extraction and tooth replacement.

  7. The effect of red wine extract, resveratrol, on the degree and rate of orthodontic tooth movement in guinea pigs

    Isidro Alex C Urriquia

    2015-01-01

    Full Text Available Objective: An animal trial, its protocol approved by the Institutional Animal Care and Use Committee of the U.P. National Institutes of Health (IACUC Protocol No. 2010-008, was employed to investigate the effects of resveratrol on the degree and rate of orthodontic tooth movement in guinea pigs. Materials and Methods: Eighteen male adult guinea pigs were randomly allocated into 3 groups: low dose, high dose, and control groups. A 0.016" titanium molybdenum alloy wire formed into a helical torsion spring with a coil, with the loops cemented onto the maxillary incisors of the animals, served as the orthodontic appliance. Daily oral administration of resveratrol was provided to the low dose (0.047 mg/kg and high dose (0.47 mg/kg groups, while water was provided to the control group. Measurements were taken everyday at the interproximal area at the level of the incisal edge using a measuring caliper. Results: The results of the ANOVA showed no statistically significant differences in the mean measurements of tooth separation among the three groups from day 2 (P=0.966 to day 8 (P=0.056. However, starting from day 9 (P=0.049 until day 18 (P=0.000, there was a significant difference in the mean tooth separation among the test groups. Conclusion: Using the LSD, it was noted that the low dose and the high dose groups have similar degrees of mean tooth separation, with the control group being significantly different from the two.

  8. Placement of replace select Ti-Unite-coated type implants using a combination of immediate and submerge techniques after tooth extraction

    Coen Pramono D

    2006-06-01

    Full Text Available The high success rate of immediate implant placement both in the anterior and posterior regions were reported by many authors, therefore applying this techniques can be considered as a safe surgical procedure and minimizing the dental office visit for patient satisfaction. This paper reports the outcome of immediate placement of implants following extraction of anterior maxillary teeth. Combination technique of immediate and submerge implant placements including bone grafting procedure were used. Four implants with TiUnite surface type were placed immediately in two patients with the short-term result indicated that this technique may serve as a simple and safe procedure for immediate implant placement. It was concluded that immediate implant placement technique combined with TiUnite implant surface was successful in treating region directly after tooth extraction therefore this technique can be use as an alternative surgical method for dental implant rehabilitation.

  9. 拔牙术后出血原因临床分析%Influence factors and clinical preventive measures of postoperative bleeding after tooth extraction

    翁烈利; 邓伟斌; 王丽晶

    2013-01-01

    Objective To investigate The influence factors and clinical preventive measures of postoperative bleeding after tooth extraction. Methods 160 patients with postoperative bleeding bleeding from January 2009 to December 2011 were chosen, and postoperative bleeding bleeding time, the causes of bleeding were retrospectively analyzed. Results 98 patients with bleeding happened within 8 hours after surgery, with the proportion of 61.25%; followed for 8 to 12 hours after surgery, with the proportion of 16.88%; 12 to 24 hours postoperative bleeding with a ratio of 15.00%, and 6.87% over 24 hours. The leading causes of bleeding after tooth extraction were gum tear alveolar bone fracture, extraction sockets rupture of blood vessels, tissue residues after mishandling, and among them, the most common cause was tear the gums, with the rate of 41.88% (67 patients). Conclusion Number of factors maybe cause bleeding after tooth extraction, and local factors is main cause.%目的 探讨影响拔牙术后出血的因素及预防措施.方法 对2009 年1 月至2011 年12 月间在我院 接受拔牙手术并出现术后出血的160 例患者的出血时间、出血原因进行回顾性分析.结果 1)患者拔牙术后出 血时间多集中在术后8 h内,占61.25% (98 例);其次为术后8~12 h,占16.88%(27 例);术后12~24 h 占15.00%(24 例),超过24 h 者占6.87%(11 例).2)导致拔牙后出血的原因有牙龈撕裂、牙槽骨骨折、拔牙窝内血管破裂、组织 残留、术后处理不当等,其中最常见的原因为牙龈撕裂,有67 例,占41.88%.结论 多种因素均可造成拔牙后出 血,以局部因素为主,进行拔牙术时要做好预防工作.

  10. Combination of Aloe vera and xenograft induction on decreasing of NF-kb of tooth extraction socket preservation in Cavia cobaya

    Utari Kresnoadi

    2014-03-01

    Full Text Available Background: Tooth extraction can naturally cause inflammation triggering osteoclast proliferation and alveolar bone resorption. Preservation of the tooth extraction sockets is needed for patients in order to reduce alveolar bone resorption risks. Aloe vera is known to have anthraquinones components, namely Aloin, Aloe emedin, and barbaloin, considered as anti-inflammation. Therefore, to overcome the inflammation, the role of NF-kb is very significant to decrease nuclear factor kappa b (NF-kb. As a result, inflammation risks will be decreased. Purpose: The study was aimed to determine the induction effect of combination of Aloe vera and XCB into tooth extraction sockets to reduce inflammation by reducing NF-kb expression, osteoclasts and osteoblasts. Methods: Forty-eight Cavia cobaya were divided into eight groups, each group consisted of six animals. The mandibular incisors of those Cavia cobaya were extracted and induced with either PEG, XCB, Aloe vera, or the combination of Aloe vera + XCB. Those animals were sacrificed on day 7 and day 30 after the extraction. Then immunohistochemical and histopathology examinations were conducted to observe NF-kb expression, osteoblasts and osteoclasts. Results: It was known that in group induced with the combination of Aloe vera and xenograft concelous bovine, the growth of osteoblasts was high, while NF-kb expression and osteoclasts reduced. Conclusion: It can be concluded that the induction of the combination of Aloe vera and XCB into the tooth extraction sockets can reduce NF-kb expression and osteoclast, as a result, alveolar bone resorption risks decrease, and osteoblast increase.Latar belakang: Trauma mekanis akibat pencabutan gigi asli menyebabkan keradangan. Keradangan memicu proliferasi osteoklas sehingga menyebabkan resorpsi tulang alveolararis. Pada pembuatan gigi tiruan, resorpsi tulang alveolar yang terjadi, sangat tidak diinginkan, sebab resorpsi tulang alveolar mengurangi keberhasilan

  11. 150例儿童患者拔牙焦虑症的调查%The prevalence of dental anxiety in 150 children patients before tooth extraction

    侯锐; 薛振恂; 夏结来

    2001-01-01

    Objective To determine the prevalence of dental anxiety in children patients before tooth extraction.Methods A modified Children's Fear Survey Schedule-Dental Subscale (CFSS-DS) and Venham's clinical ratings of anxiety and cooperative behavior were used in 150 children patients ranging in age from 5 to 12 years olds before tooth extraction. The former scale was answered by parents on behalf of their children, and the latter ratings was assessed by the author. Results CFSS-DS scores and clinical ratings of behavior of the children were significantly higher in the children whose oral hygiene condition, dental experience, tooth extraction experience, spirit status on that day and whose mother's educational background were bad or low. A step regression analysis showed that oral hygiene condition had most significant interrelationship with both of the two scales(P<0.01). The correlation of the two scales was high (r=0.67).Conclusion Children’s oral hygiene condition, dental experience, tooth extraction experience, spirit status on that day and their mother’s educational background are closely related to the dental anxiety level. Oral hygiene condition is the most important predictor of anxiety level before extraction and clinical ratings of behavior during extraction.%目的调查儿童患者拔牙术前的焦虑状况。方法采用改良的儿童畏惧调查表-牙科分量表(CFSS-DS)和Venham临床焦虑及合作行为级别评定量表对150例患儿拔牙术前焦虑状况进行调查及统计分析。结果口腔卫生状况较差者,既往看牙或拔牙经历痛苦者,拔牙当天精神状态较差者或母亲文化程度较低者的患儿CFSS-DS的评分值和Venham评定级别明显较高,且有统计学意义。逐步回归分析表明:口腔卫生状况与两量表评定的相关关系均最显著(P<0.01)。两量表的相关性显著(r=0.67)。结论儿童拔牙术前的焦虑状况与其口腔卫生状况、看牙经

  12. 不同方法处理拔牙创对减少拔牙后并发症的临床观察%A clinical study of different treatments to reduce the complications after tooth extraction

    黄伟; 程旭; 刘红红

    2015-01-01

    Objective:To explore a new method to reduce the postoperative complications of toothextraction.Com-pare three different ways to deal with after tooth extraction forreducing wisdom teeth removed after the effect of post-operative complications.Methods:Randomly selected 250 patients,in a random way is divided into threegroups,Group A is the tooth socket after tooth extraction built-in gelatinsponge,Group B is the tooth socket after tooth extraction built-in gelatinsponge and calcium hydroxide powder mixture,Group C is blank control.After 1week,observed in each group complications,include hemorrhage, infection, drychamfer disease.Using statistical analysis of data. Results:Group B compared with group A the prevention of postoperativecomplication rate has obvious statistical significance (P0.05). Group B compared with group C the prevention of postoperativecomplication rate has obvious statistical significance ( P0.05),B组较C组在预防术后并发症(出血、感染、干槽症)具有明显的统计学意义(P<0.001)。结论:在传统的明胶海绵基础上添加氢氧化钙粉剂对于预防术后出血、感染、干槽症具有较好效果,值得临床推广。

  13. 拔牙术后出血的临床护理心得探究%Result of hemorrhage after tooth extraction of clinical nursing

    王嘉玲

    2016-01-01

    目的:探讨拔牙术后出血的临床护理心得。方法:本次病例对象为我院自2014年2月以来所收治的75例拔牙术后出血患者,按照顺序编码法将患者分为常规组和干预组。常规组行常规护理;干预组给予周全细致的护理。评价:(1)满意率;(2)止血时间、患者焦虑评分。结果:(1)干预组患者满意率显著比常规组高,比较后差异显著,P<0.05;(2)干预组止血时间、患者焦虑评分显著比常规组好,比较后差异显著,P<0.05。结论:拔牙术后出血给予周全细致的护理,可有效止血,减轻患者焦虑感,提升其满意率,值得推广。%Objective To explore the clinical nursing experience of hemorrhage after tooth extraction.Methods Select our hospital since February 2014, 75 cases treated by postoperative bleeding in patients with tooth extraction, were randomly divided into conventional group and intervention group. Conventional group of routine nursing; Intervention group was given thorough and meticulous care. Results For satisfaction, hemostatic time, patients' anxiety score, intervention group was significantly better in the conventional group, significant difference,P < 0.05).Conclusions Given with hemorrhage after tooth extraction is thorough and meticulous care, can effectively stop bleeding, relieve patients' anxiety and improve their satisfaction, is worth promoting.

  14. Clinical use of cone beam CT in impacted maxillary tooth extraction and artifistulation%锥形束CT定位埋伏牙的临床应用

    董辉; 冯春丽; 孙蕾; 祁森荣; 夏登胜

    2011-01-01

    目的 探讨锥形束CT影像和三维重建技术在辅助埋伏牙拔除和正畸开窗牙牵引术中的作用.方法 选择53颗常规曲面断层片难以确定埋伏牙空间位置的患者进行锥形束CT扫描,其中对5例复杂埋伏牙的CT图像进行三维重建.45例埋伏牙依据CT图像选择不同手术入路行拔牙术,8例埋伏牙采用颌骨开窗牵引术.结果 螺旋CT影像对正确选择埋伏牙拔除的手术入路具有良好的指导作用;CT三维重建图像能清楚地显示埋伏牙的牙体形态、唇腭向位置以及和邻牙的关系,正确指导手术开窗牵引的入路和开窗牵引装置的固定.结论 锥形束CT和三维重建技术在显示埋伏牙的位置和牙体形态上明显优于传统的曲面断层和根尖片.%Objective To evaluate the value of cone beam CT and three-dimensional reconstruction in impacted maxillary tooth extraction and artifistulation. Methods Fifty-three patients with impacted maxillary teeth were included and examined by cone beam CT, and 3D reconstruction was conducted in five of them . Results The cone beam CT images clearly denmonstrated the location of the teeth and provided help in the impacted tooth extraction. The threedimensional reconstruction technique guided and simplified the procedure of artifistulation. Conclusion Cone beam CT has more advantages in assistance of impacted tooth extraction and artifistulation in orthodontics compared with traditional panoramic radiography.

  15. The effects of dried root aqueous extract of Salvia miltiorrhiza and its major ingredient in acceleration of orthodontic tooth movement in rat

    Li-qun Xiao

    2015-10-01

    Full Text Available Objective(s: Salvia miltiorrhiza (SM is a popular and classic herb in traditional Chineses medicines. The objective is to confirm the effects of aqueous extract of S. miltiorrhiza (ESM and its main ingredient on the promotion of orthodontic tooth movement and healing of periodontal ligament in rat. Materials and Methods: Male Sprague-Dawley rats (n= 150 were divided into five groups: model control group (0.5 ml/kg phosphate-buffered saline (PBS injection, ESM group (0.75 g/kg/day of crude drugs and Danshensu subgroups (250, 500, 750 mg/kg/day of body weight. All rats were administered intramuscularly into the buccal vestibular mucosa of first molar of left maxillary. The indicators such as the moving distance of orthodontic tooth, nuclear factor κB ligand (RANKL and osteoprotegerin (OPG expression and osteoclasts were tested. Results: The expressions of RANKL and OPG in the treatment groups were obviously enhanced compared with control group (P

  16. 300例下颌阻生智齿拔除的临床疗效分析%Clinical Efficacy of 300 cases of mandibular wisdom tooth extraction

    王永静

    2014-01-01

    Objective Discussion unplug mandibular wisdom teeth surgery, precautions and clinical results. Methods 300 cases randomly selected mandibular wisdom tooth extraction surgery patients, Using the elongation method, near the mill division, elon-gation split method, Backflush law, boneless Comprehensive unplug all types of mandibular wisdom teeth. Results All patients impacted wisdom teeth are completely unplug, were cured. COMING 20 cases of intraoperative bleeding during surgery flap 12 cases, intraoperative loosening two cases of adjacent teeth, teeth falling in the next lingual mandibular periosteum two cases, the root fall in one case within the mandibular canal, tooth extraction after eight cases of invasive infection , dry socket two cases, no serious complications. Conclusion The mandibular wisdom tooth extraction surgery is more complex alveolar surgery, select the appropriate method of disconnecting, disconnect time, master control strategies can be effective in reducing the occurrence of mandibular wisdom tooth extraction intraoperative and postoperative complications, the successful implementation of the key tech-nique of extraction.%目的:探讨拔除下颌阻生智齿的手术方法、注意事项及临床效果。方法随机选择300例需行下颌阻生智齿拔除术患者,根据患者的临床情况,下颌阻滞加局部麻醉下采用挺出法、近中磨除法、劈开挺出法、倒冲法、去骨法综合拔除各类下颌阻生智齿。结果所有患者阻生智齿都完全拔除,均痊愈。术中断根20例,术中翻瓣时出血12例,术中邻牙松动2例,牙齿坠入下颌骨舌侧骨膜下2例,牙根坠入下颌管内1例,拔牙后拔牙创感染8例,干槽症2例,无严重并发症发生。结论下颌阻生智齿拔除术是较为复杂的牙槽外科手术,选择合适的拔除方法、拔除时间,掌握好防治对策可有效减少下颌阻生智齿拔除术中术后并发症的发生,是成功实施拔除术的关键。

  17. Primary culprit for tooth loss!!

    Sailavanya Nuvvula

    2016-01-01

    Full Text Available Aim: In order to facilitate planning for dental health services and to progress strategies to continue the reduction in tooth loss, it is important to identify the factors that result in such loss. therefore the aim of the study is to investigate the major cause for tooth extraction. Objective: to examine whether the major reason for tooth extraction is dental caries or periodontal disease. Materials and Methods: The study is carried out among the dental practitioners in our district. A questionnaire containing 10 items was distributed to the dental practitioners, which included age, gender, no of teeth indicated for extraction, the reason for extraction, and the periodontal parameters that are involved with the extracted tooth and were requested to complete the form on every extraction they were to undertake. the study form was collected at the end of the study period and data was subjected to statistical analysis. Results: A total of 502 patients were enrolled during the study period, and a total of 1055 teeth were extracted for several reasons. we found that 51.14%extractions are due to dental caries in case of 20-30years age groups, which is more when compared to tooth loss due to periodontal diseases in this age group. whereas in case of >40years of age group periodontal diseases account for 54.11%, and dental caries accounts for only 29.11%. Showing more teeth were lost due to periodontal disease. Conclusion: therefore we concluded that, caries is the dominant reason for extraction in patients with 20–30 years of age while periodontal disease accounts for the majority of tooth extraction in patients older than 40 years.

  18. 80例拔牙后出血原因分析及治疗体会%80 cases analysis of the reasons of Bleeding after tooth extraction and Treatment experiences

    石开中

    2014-01-01

    Objective: To summarize the common causes of bleeding after tooth extraction and effective treatment methods. Methods: The cause of bleeding after 80 cases of extraction and processing methods are summarized. Re-sults: The remaining of inflammatory granulation tissues within the alveolar socket, poor protection of blood clots and the tearing of soft tissues are the main reasons of bleeding after tooth extraction. Stitching and packing are effective treatment methods. Conclusion: Master indication and contraindication of tooth extraction, reduce the trauma in the surgery, thoroughly scrap the suspected apical granulation tissue within the alveolar socket, routine suture soft tissue injuries, education after tooth extraction, etc. can basically prevent bleeding after tooth extraction.%目的:探讨拔牙后出血常见原因有效处理方法。方法:对80例拔牙后出血患者原因及处理方法进行总结。结果:牙槽窝内残留炎性肉芽组织、血块保护不良及软组织撕裂是拔牙后出血的主要原因。缝合和填塞是有效处理方法。结论:术前严格掌握拔牙适应证和禁忌证,术中减少创伤,对疑有根尖肉芽组织,拔牙窝一定要搔刮彻底;有软组织损伤应当常规缝合;拔牙术后宣教等可基本避免拔牙后出血。

  19. Tooth in oropharynx

    Nagarajappa, D; B S Manjunatha

    2011-01-01

    The incidence of ectopic teeth has increased. In many cases, the etiology of ectopic teeth cannot be identified. Ectopic tooth in deciduous dentition period is very rare and information is limited about its causes and characteristics. The conditions commonly associated with an increased prevalence of ectopic teeth include cleft lip and palate, cleidocranial dysplasia, and Gardner syndrome. The diagnosis is made by the clinical and radiological examinations. The indication for extraction in ec...

  20. Clinical evaluation of influence of aspirin on post-operative bleeding after tooth extraction in the elderly%阿司匹林对老年人拔牙术后出血影响的临床观察

    王文英; 崔念晖; 王恩博; 张伟

    2013-01-01

    Objective To investigate the feasibility of continuation of aspirin before tooth extraction in the elderly.Methods The patients enrolled in this study were the elderly requiring a single non-impacted tooth extraction.300 elderly outpatients used lidocaine local infiltration anesthesia,200 patients without using aspirin before tooth extraction served as control group Ⅰ,100 patients with prolong use of aspirin before tooth extraction as observation group Ⅰ.300 elderly outpatients used compound articaine local infiltration anesthesia,200 patients without using aspirin before tooth extraction served as control group Ⅱ,100 patients with prolong use of aspirin before tooth extraction as observation group Ⅱ.Bleedings at 5,10,30 min,24 h after tooth extraction were observed and the relationship between postoperative bleeding and intake of aspirin was analyzed.Results There was no significant difference at 5,10,30 min,24 h in postoperative bleeding after extraction between control group Ⅰ and observation group.The incidence of bleeding of observation group Ⅱ after tooth extraction at 5 min was higher than that of control group Ⅱ and there was no significant difference at 10,30 min,24 h between the two groups.Conclusions Continuation of aspirin have no influence on postoperative bleeding.Therefore we suggest that there was no indication to discontinue aspirin for the elderly before a single non-impacted tooth extraction.%目的 探讨老年人拔牙术前不停服阿司匹林的可行性.方法 600例均为拔除非阻生单颗牙的60岁以上患者,300例使用利多卡因局麻,其中200例未服用阿司匹林者为空白对照组Ⅰ,100例长期服用阿司匹林且术前不停药者为观察组Ⅰ;300例使用复方阿替卡因局麻,其中200例未服用阿司匹林者为空白对照组Ⅱ,100例长期服用阿司匹林且拔牙术前不停药者为观察组Ⅱ.观察研究对象拔牙创不同时间段出血情况,分析口服阿司匹林对拔牙术

  1. 70 cases of clinical evaluation of tooth extraction in elderly patients with diabetes mellitus%老年糖尿病70例拔牙临床疗效评估

    李长宾

    2015-01-01

    ObjectiveTo explore the tooth extraction in elderly patients with diabetes mellitus a mucosa suture effect on tissue healing.Method65 diabetic patients over a total of 70 cases,were randomly divided into groups,the same control of blood pressure before operation,35 cases after tooth extraction wound give suture,the other 35 cases as the control group not suture.Resultsone week after tooth extraction review,suture group mucosal healing well and no adverse reaction. The control group has 22 cases of poor healing.Conclusionpreoperative effective control of blood glucose and blood pressure,postoperative tooth extraction wound suture of mucosa,elderly diabetic patients can tooth.%目的:探讨老年糖尿病患者拔牙创黏膜缝合对组织愈合的影响。方法选择65岁以上糖尿病患者共70例,随机分为2组,同样术前控制血糖血压,35例拔牙后创面给予缝合,另35例作为对照组不予缝合。结果拔牙后1周复查,缝合组黏膜愈合好,无不良反应;对照组22例愈合不良。结论术前有效控制血糖及血压,术后拔牙创黏膜缝合,老年糖尿患者拔牙并不受影响。

  2. Attractancy toOryzaephilus surinamensis (L.), saw-toothed grain beetle, of extracts of carobs, some triglycerides, and related compounds.

    O'Donnell, M J; Chambers, J; McFarland, S M

    1983-03-01

    A laboratory method has been devised for testing the attractancy of vapors to adultOryzaephilus surinamensis (L.). Of four solvent extracts prepared from pods of the carob tree [Ceratonia siliqua (L.)], all attractedO. surinamensis, but the least polar extract was the most active. Subdivision of extracts yielded a series of fractions, the most attractive of which contained a mixture of triglycerides with three or more double bonds per molecule. Twelve authentic triglycerides, either synthesized or purchased, elicited responses ranging from high to very low attractancy in a way which appeared to be related to the number, position, and geometrical shape of the double bonds in the molecules. By studying the response of the insects to five glyceride acids, three aldehydes, and three volatile fatty acids, it has been shown that it may be possible to explain the attractancy attributed to the triglycerides, which are involatile, in terms of the response to their volatile breakdown products.

  3. 微创拔牙法与普通拔牙法拔除残根残冠的效果比较%Comparison of minimally invasive and general tooth extraction in pulling out residual roots and crowns

    张丹; 刘长春

    2015-01-01

    Objective To compare the clinical effect of minimally invasive and general tooth extraction in pulling out residual roots and crowns.Methods Six hundred teeth of residual roots and crowns that needed to be extracted were divided into two groups. The minimally invasive tooth extraction and general tooth extraction were applied,respectively.Results The minimally invasive group was obviously superior to the traditional group in rates of incomplete teeth extraction socket,fractured dental root and gum laceration. Conclusion The curative effect of minimally invasive tooth extraction is positive and it should be widely used in clinic.%目的:对比微创拔牙法与普通拔牙法拔除残根残冠的临床效果。方法选择需拔除的残根残冠600颗,按随机数字表法分为微创组与传统组各30例,分别采用微创拔牙方法与普通拔牙方法拔除残根残冠,观察两组的临床治疗效果。结果微创组在拔牙窝的不完整率、断根率、牙龈撕裂发生率等方面明显优于传统组,差异均有统计学意义( P<0.05)。结论微创拔牙法疗效肯定,值得在临床普遍采用。

  4. 减数矫正后发生牙龈折痕的临床分析%Clinical analysis of gingival invagination after tooth extraction

    房莉; 徐远志; 张旭; 吴隽轶; 唐小山

    2012-01-01

    AIM: To present the incidence, causes and influence factors on gingival invaganation after or- thodontic space closure of tooth extraction sites. METHODS: One hundred and fifty-two Edgewise fixed appliance cases with premolars removed were retrospectively analyzed. Clinical analysis criteria were gender, age, treatment period and the width of extraction site. The results were statistically analyzed by Logistic regression. RESULTS: The incidence of gingival invaganation was 23. 7% . Logistic regression analysis revealed that gender, age and the time needed for closure of the extraction spaces had no influence on the incidence of gingival invagination. The width of extraction spaces was negatively correlated to the incidence of gingival invagination and the gingival invagination was more severe in the mandibular arch than in the maxillary arch (P <0. 05) . CONCLUSION: After orthodontic closure of extraction sites, the width of extraction sites influenced the incidence of gingival invagination, and the gingival invagination was more likely to happen on the lower jaw than on the upper jaw.%目的:探讨减数矫治病例拔牙间隙关闭后牙龈折痕现象的发生率、形成原因和影响因素.方法:选择152例拔除前磨牙行直丝弓固定矫治的病例,分别依性别、年龄、上下颌、关闭间隙距离以及矫治时间等进行比较,将检查结果进行统计学分析.结果:152例患者牙龈折痕发生率为23.7%.经Logistic回归分析,性别、年龄和关闭间隙的时间对牙龈折痕的出现无统计学意义(P>0.05),关闭间隙的距离与牙龈折痕的出现呈负相关(P<0.05).下颌较上颌更易出现牙龈折痕(P<0.05).结论:减数矫治病例拔牙间隙的距离大小影响牙龈折痕的出现,并且下颌较上颌更易出现牙龈折痕.

  5. 下颌第三磨牙拔出方法与颞下颌关节紊乱病的相关性研究%Relationship between Methods of Extract Mandibular Third Tooth and TMD

    刘志明; 张周文; 黄丽; 毛甜甜; 彭友俭

    2015-01-01

    Objective:To investigate the relationship between methods of extract tooth and TMD.Methods:160 individual were randomly chosed.Minimally invasive and traditional extract tooth methods were used respectively to extract impacted tooth of third molar of mandibular.Dual-axis diagnosis standard was used to analyse the symptom of TMD after operation of extract the tooth in pre-operation,post-operation 1,4,24 weeks.Results:The group of minimally invasive morbidity of temporomandibular joint click was significantly lower than the traditional extract tooth methods group,and this difference was statistically significant.Conclusion:Minimally invasive extract tooth methods can reduce the complication of TMD.%目的:分析不同拔牙方式对下颌第三磨牙拔出后患者出现TMD的症状,探讨两种拔牙方式拔出下颌第三磨牙后与TMD的相关性.方法:随机选择符合纳入标准的需要拔出下颌第三磨牙的患者160例,采用微创拔牙法与传统拔牙法拔出异位萌出的下颌第三磨牙,在拔牙术前、术后1周、4周、6月分别进行TMD的双轴诊断,确定TMD的不同程度.结果:通过对160例拔牙患者6个月的回访发现,微创拔牙方式拔除下颌第三磨牙后弹响消失、减轻的患者占15%,选择传统拔牙方式拔除下颌第三磨牙后弹响消失、减轻的患者占7.5%;双轴诊断评价结果显示运用微创技术拔出下颌第三磨牙后出现颞下颌关节结构紊乱疾病、咀嚼肌紊乱疾病的患者数量较传统拔牙法有下降的趋势,差异具有统计学意义.结论:微创拔牙技术能够显著降低下颌第三磨牙拔出术中、术后颞下颌关节紊乱并发症出现的几率.

  6. Application of the minocycline in the prevention of dry socket after extract the mandibular tooth%米诺环素在下颌阻生牙拔除后干槽症预防中的应用

    李薇; 于世德; 洪席超

    2015-01-01

    目的:将米诺环素放入下颌阻生牙拔除后牙槽窝,评价其预防干槽症的效果。方法选择韶关学院医学院附属医院口腔门诊拔除下颌阻生牙的患者126例,随机分成两组,试验组在拔除阻生牙后放入米诺环素,对照组不放任何材料任其自行愈合,1周后复诊观察干槽症的发生情况。结果试验组有1例干槽症发生,对照组有8例干槽症发生,两组干槽症发生率的差异有统计学意义(P <0.05)。结论复杂阻生牙拔除术,由于创伤大、操作时间长,在牙槽窝放入米诺环素可预防干槽症的发生。%Objective To evaluate the effect of minocycline on the prevention of dry socket after tooth extraction. Methods A total of 126 patients who had been extracted the mandibular impacted tooth were selected from the Affiliated Hospi-tal of Shaoguan Medical College,who were randomly divided into two groups. In the experimental group,minocycline were put into the sockets after the mandibular impacted tooth were extracted;in the control group,the wounds were not put any materials until they were healed. The incidence of dry socket after 1 week was observed. Results One patient had dry socket after tooth extraction in the experimental group;in the control group,eight patients suffered from dry socket after tooth extraction. There was significant difference in the incidence of dry sodket between the two groups(P < 0. 05). Conclusion In order to prevent the in-cidence of dry socket,especially in impacted tooth extraction which are more traumatic and the operating time is longer. It is a good choice to prevent dry socket by putting minocycline into socket after the operation.

  7. The effect of combined Moringa oleifera and demineralized freeze-dried bovine bone xenograft on the amount of osteoblast and osteoclast in the healing of tooth extraction socket of Cavia cobaya

    Rostiny Rostiny

    2016-12-01

    Full Text Available Background: Alveolar bone has an important role in providing support to teeth and dentures. Loss of support caused by alveolar resorption will cause functional and aesthetic problems. Preservation socket using bone graft is one way to maintain the dimensions of the alveolar bone. Moringa oleifera leaf can increase the activity of bone graft in the formation of new bone. Purpose: This study was aimed to evaluate the effect of combined Moringa oleivera leaf extract and demineralized freeze-dried bovine bone xenograft (DFDBBX towards the formation of osteoblasts and osteoclasts in the tooth extraction sockets of cavia cobaya. Method: This study used 28 cavia cobayas divided into four groups. The combination of Moringa oleifera leaf extract and DFDBBX was inducted into the sockets of lower incisor tooth with certain dose in each group, ointment 1 containing PEG (a mixture of PEG 400 and PEG 4000 for control group, ointment 2 containing Moringa oleifera leaf extract and DFDBBX and PEG (at active subtance consentration of 0.5% for group 1, ointment 3 containing Moringa oleifera leaf extract and DFDBBX and PEG (at active substance concentration of 1% for group 2, and Ointment 4 containing Moringa oleifera leaf extract and DFDBBX and PEG (at active substance consentration of 2% for group 3. paraffin block preparations were made for histopathology examination using hematoxylin eosin staining. Result: The results showed that there were significant differences of the number of osteoblasts and osteoclasts in each treatment group (p <0.05. Conclusion: It can be concluded that the combination of Moringa oleifera leaf extract and DFDBBX at 2% cocentration can increase the number of osteoblasts and decrease osteoclasts in the healing of tooth extraction sockets of cavia cobaya.

  8. Prevention and Treatment of Dry Socket of 60 Cases after Tooth Extraction%60例拔牙后干槽症预防及治疗

    蒋威

    2014-01-01

    Objective The prevention and treatment of dry socket are designed to be discussed.Methods The prevention and treatment data of 60 cases of patients suffering from dry socket are selected to analyze.Results Al patients who suffered from dry socket are cured after the treatment. Conclusion Trauma should be reduced; the tooth extraction wound should be reduced and the blood clots need to be protected in case of infection. The treatment need to be conducted for the patients with dry socket to debride the wound, isolate from the outside world, stimulate and promote the growth of granulation tissue.%目的:探讨干槽症的预防及治疗方法。方法选取60例发生干槽症患者,并对其预防处理资料进行分析。结果所有发生干槽症患者经治疗后,全部治愈。结论干槽症的预防主要是减小创伤,缩小拔牙创伤,保护血凝块,预防感染。对干槽症患者的治疗应给予清创、隔离外界刺激和促进肉芽组织生长。

  9. 阿替卡因在拔牙术中的疗效观察%Clinical Application of Articaine in Tooth Extraction

    黄丽梅; 赵连生

    2014-01-01

    目的分析阿替卡因(碧兰麻)在拔牙术中的麻醉效果。方法选取2008年3月~2013年3月在我院口腔科就诊的拔牙患者200例,300颗牙齿,随机分为阿替卡因组和利多卡因组,分别行局部浸润及阻滞麻醉。结果阿替卡因组有效率为96%,利多卡因组有效率84%,阿替卡因组麻醉优良率明显高于利多卡因组(P<0.05)。结论阿替卡因用于拔牙术中的浸润麻醉,起效快,效能高,是理想的局部麻醉药物。%Objective To analyze the articaine (Primacaine) anesthesia in tooth extraction. Methods Select the 2008.3~2013.3 in our hospital, 200 cases were admit ed to Department of Stomatology, 300 teeth, were randomly divided into articaine group and lidocaine group, respectively, for local infiltration and block anesthesia. Results articaine group ef ective rate was 96%, lidocaine group was 84%, excellent rate of articaine anesthesia group was significantly higher than that of lidocaine group ( <0.05). Conclusion Articaine used as infiltration anesthesia, the extraction operation of fast acting, high ef iciency, is an ideal local anesthetic drug.

  10. Autogenous Transplantation for Replacing a Hopeless Tooth

    Zakershahrak, Mehrsa; Moshari, Amirabbas; Vatanpour, Mehdi; Khalilak, Zohreh; Jalali Ara, Afsoon

    2017-01-01

    Autogenous tooth transplantation (ATT) is a simple and reasonable choice for replacing the missing teeth when a proper donor tooth is available. This report presents a case of successful ATT of a maxillary right third molar for replacement of mandibular right second molar with a concomitant endodontic-periodontal disease. The mandibular second molar was believed to be hopeless due to a severe damage to coronal tooth structure, inappropriate root canal treatment and apical radiolucency. After extraction of mandibular second molar and maxillary third molar (the donor), the tooth was re-implanted into the extracted socket of second molar site. Root canal therapy was then performed. After 3 years, clinical and radiographic examinations revealed satisfying results, with no signs and symptoms. The patient is asymptomatic and the transplanted tooth is still functional with no signs of marginal periodontal pathosis. Radiographies showed bone regeneration in the site of previous extensive periapical lesion, normal periodontal ligament with no signs of root resorption. PMID:28179939

  11. Contour changes in human alveolar bone following tooth extraction of the maxillary central incisor%人类上颌中切牙拔除后牙槽骨外形变化的研究

    Bei LI; Yao WANG‡

    2014-01-01

    The purpose of this study was to apply cone-beam computed tomography (CBCT) to observe contour changes in human alveolar bone after tooth extraction of the maxillary central incisor and to provide original mor-phological evidence for aesthetic implant treatment in the maxilary anterior area. Forty patients were recruited into the study. Each patient had two CBCT scans (CBCT I and CBCT II), one taken before and one taken three months after tooth extraction of maxillary central incisor (test tooth T). A fixed anatomic reference point was used to orient the starting axial slice of the two scans. On three CBCT I axial slices, which represented the deep, middle, and shallow layers of the socket, labial and palatal alveolar bone widths of T were measured. The number of sagittal slices from the start point to the pulp centre of T was recorded. On three CBCT II axial slices, the pulp centres of extracted T were oriented according to the number of moved sagittal slices recorded in CBCT I. Labial and palatal alveolar bone widths at the oriented sites were measured. On the CBCT I axial slice which represented the middle layer of the socket, sagittal slices were reconstructed. Relevant distances of T on the sagittal slice were measured, as were the alveolar bone width and tooth length of the opposite central incisor. On the CBCT II axial slice, which represented the middle layer of the socket, relevant distances recorded in CBCT I were transferred on the sagittal slice. The height reduction of alveolar bone on labial and palatal sides was measured, as were the alveolar bone width and tooth length of the opposite central incisor at the oriented site. Intraobserver reliability assessed by intraclass correlation coefficients (ICCs) was high. Paired samplet-tests were performed. The alveolar bone width and tooth length of the opposite central incisor showed no statistical differences (P<0.05). The labial alveolar bone widths of T at the deep, middle, and shalow layers al showed

  12. Effect of acemannan, an extracted polysaccharide from Aloe vera, on BMSCs proliferation, differentiation, extracellular matrix synthesis, mineralization, and bone formation in a tooth extraction model.

    Boonyagul, Sani; Banlunara, Wijit; Sangvanich, Polkit; Thunyakitpisal, Pasutha

    2014-07-01

    Aloe vera is a traditional wound healing medicine. We hypothesized acemannan, a polysaccharide extracted from Aloe vera gel, could affect bone formation. Primary rat bone marrow stromal cells (BMSCs) were treated with various concentrations of acemannan. New DNA synthesis, VEGF, BMP-2, alkaline phosphatase activity, bone sialoprotein, osteopontin expression, and mineralization were determined by [(3)H] thymidine incorporation assay, ELISA, biochemical assay, western blotting, and Alizarin Red staining, respectively. In an animal study, mandibular right incisors of male Sprague-Dawley rats were extracted and an acemannan treated sponge was placed in the socket. After 1, 2, and 4 weeks, the mandibles were dissected. Bone formation was evaluated by dual-energy X-ray absorptiometry and histopathological examination. The in vitro results revealed acemannan significantly increased BMSC proliferation, VEGF, BMP-2, alkaline phosphatase activity, bone sialoprotein and osteopontin expression, and mineralization. In-vivo results showed acemannan-treated groups had higher bone mineral density and faster bone healing compared with untreated controls. A substantial ingrowth of bone trabeculae was observed in acemannan-treated groups. These data suggest acemannan could function as a bioactive molecule inducing bone formation by stimulating BMSCs proliferation, differentiation into osteoblasts, and extracellular matrix synthesis. Acemannan could be a candidate natural biomaterial for bone regeneration.

  13. Clinical oberservation of influence of wafarin on post-operative bleeding after tooth extraction in the elderly%华法林对老年人拔牙术后出血影响的临床观察

    王文英; 崔念晖; 王恩博; 张伟

    2013-01-01

    Objective To investigate the feasibility of continuing warfarin when international normalized ratio (INR) was less than 2.5 before tooth extraction in the elderly.Methods One hundred elderly outpatients with prolong use of warfarin and maintaining INR < 2.5 before tooth extraction served as observation group,200 elderly outpatients without taking anticoagulant and antiplatelet medicine served as control group.All the patients underwent a single non-impacted tooth extraction.Postoperative bleeding at different time was observed.Results There was significant difference in postoperative bleeding at 5,10,30 min,24 h after extraction and there was no significant difference at 48 h between control group and observation group(P <0.05)and no bleeding was found in either group at 48 h(incidence of bleeding were 0%).Conclusions It was feasible to continue warfarin for the elderly maintaining INR < 2.5 undergoing a single non-impacted tooth extraction by monitoring postoperative bleeding and hemostatic treatment measures.%目的 探讨国际标准化比值(international normalized ratio,INR) <2.5、拔牙术前不停服抗凝剂华法林的可行性.方法 选取门诊100例拔牙术前不停服华法林且INR值<2.5的60岁以上拔牙患者为观察组,200例拔牙术前未服抗凝及抗血小板药物的60岁以上拔牙患者为对照组,均拔除单颗非阻生牙,观察拔牙术后不同时间段的出血情况.结果 两组患者拔牙术后5、10、30 min、24h 出血发生率差异有统计学意义(P<0.05),48 h两组均无出血发生(出血发生率为0%).结论 经规范的拔牙操作同时有术后积极的出血监控和相应的止血处理措施,老年人拔除单颗非阻生牙术前INR值<2.5不停服华法林是可行的.

  14. 冷敷在口腔颌面外科拔牙术后的应用现状与进展%Applicationand progress of cold compress after tooth extraction

    汪美凤

    2016-01-01

    拔牙术后出血与肿胀是拔牙后各类并发症的首发或主要症状之一。随着高品质口腔诊疗的发展,口腔颌面齿槽外科医护人员越来越重视最大限度地减低拔牙患者术后反应,提高患者舒适度。冷敷可有效减轻患者术后出血及肿痛,此方法在临床广泛应用。现就拔牙后出血、肿胀机制及冷敷在拔牙术后的应用原理、方法、材料选择等方面予以综述,供同仁借鉴。%Bleeding and swelling is one of the first kinds of complications or main symptoms after tooth extraction. With the development of high quality oral treatment, the doctors and nurses of oral and maxillofacial alveolar surgery pay more and more attention to maximize reduce the postoperative tooth extraction reaction, improve patient comfort. Cold compress can effectively reduce postoperative bleeding and pain, so it has been widely used in clinical application. The mechanism of bleeding and swelling after tooth extraction and the application principle, method, material selection of cold compress are reviewed in this paper, in order to provide reference for the colleague.

  15. Research prowess on reduction of bone resorption through alveolar ridge preservation after tooth extraction%应用牙槽窝保存技术减少拔牙后骨吸收的研究进展

    张勇

    2011-01-01

    口腔种植作为一种缺失牙的修复方式已经被临床广泛地接受,然而,成功的种植修复需要有足够的牙槽骨骨量和良好的牙槽嵴外形.患者的牙齿拔除后,骨吸收会造成牙槽嵴体积和外形的变化.若这种变化在临床上较为明显,可以对种植修复或传统修复造成困难.牙槽嵴保存技术则可以使拔牙后的牙槽嵴吸收最小化,可以保持足够的牙槽骨量,从而有助于获得理想的美学和功能修复.本文对牙槽窝保存技术、微创拔牙技术、拔牙后的牙槽窝愈合模式以及骨移植材料和屏障膜的使用作一综述.%Implant therapy has become a widely recognized treatment alternative for replacing missing teeth.While successful implant therapy requires sufficient alveolar bone volume and favorable ridge architecture. After tooth extraction, dimensional changes of the alveolar ridge often occur due to bone resorption. These changes are usually clinically significant and can complicate restorations with implant or conventional prostheses. Preservation of alveolar dimension can minimize residual ridge resorption and can be essential to maintain adequate bone volume, thus be crucial to achieve optimal esthetic and functional prosthodontic results. This article reviewed the literature, presents socket preservation techniques, atraumatic tooth extraction, healing pattern of socket after tooth extraction as well as the use of bone grafting materials and barrier membranes.

  16. Tooth sensitivity and whitening.

    Swift, Edward J

    2005-09-01

    This article presents a review of the basic concepts of tooth sensitivity and how those concepts apply to cervical dentin hypersensitivity and the sensitivity frequently associated with tooth whitening. The etiology and treatment of cervical dentin hypersensitivity are described. The clinical presentation, incidence, and predisposing factors for sensitivity associated with tooth whitening also are discussed.

  17. Oral Surgery Outpatient Tooth Extraction of Serious Complications in Clinical Research%口腔外科门诊拔牙中严重并发症的临床治疗研究

    姜广荣

    2015-01-01

    Objective In studying oral surgery outpatient tooth extraction in the clinical treatment of serious complications. Methods Select the hospital from May 2013 to May 2013 in oral surgery clinic tooth extraction and 80 cases of patients with serious complications, complications included teeth residual roots into 13 cases of maxillary sinus, 15 cases of postoperative bleeding, anesthesia syringe needle within the organization completely fracture 3 cases, mandibular impacted maxillary teeth into 16 cases of lingual clearance, tooth root part into the groove neural tube 6 cases, 6 cases of mandibular fracture, 21 cases of postoperative infection, etc., related symptoms occur immediately after symptomatic treatment.Result All of the patients after a timely and effective treatment, all patients with complications were cured, but the efficacy is not the same.Conclusion Can see from the above research, tooth extraction for oral surgery clinic patients complicated with severe complications, the cure rate is high, despite the curative effects, but both can be cured.%目的:探讨研究口腔外科门诊拔牙中严重并发症的临床治疗。方法选取该院从2013年5月到2015年5月的在口腔外科门诊拔牙中并且有严重并发症的患者80例,并发症中包括牙齿残根误入上颌窦13例,术后出血15例,局麻注射器针头在组织内部完全断裂3例,下颌阻生牙误入舌侧间隙16例,牙齿根尖部分进入槽神经管6例,下颌骨骨折6例,术后感染21例等,发生相关症状后立刻进行对症处理。结果所有患者经过及时有效的处理之后,所有并发症患者均得到治愈,但是其中的疗效并不相同。结论从上述研究中可以了解,对于口腔外科门诊拔牙并发严重并发症的患者,其治愈率高,虽然存在疗效差异,但是均能够得到治愈。

  18. 'Split posterior tooth': conservative clinical re-attachment.

    Abraham, Sathish; Chacko, Lisa Neelathil

    2014-07-30

    Trauma is the prime causative factor for fracture of teeth/dentition. Many procedural management options are followed successfully in relation to the anterior teeth. However, most posterior cases where the tooth is fractured have only limited options to pursue to save the tooth. Fractured teeth, whether they are vital/non-vital, are predominantly managed with surgical options. This paper discusses a conservative approach to reattaching a split posterior tooth. A split tooth situation is mostly an absolute indication for extraction, but the clinician may go in for extensive surgical procedures if he/she wishes to save it. The reattachment of the tooth can be successfully done and it can be put to function. This paper discusses how a split posterior tooth can be treated successfully, although depending on multiple factors. A full crown cemented after successful reattachment and root canal therapy would provide sufficient support in order for the tooth to heal.

  19. Tooth Retained Implant: No More an Oxymoron

    Divya Bhat

    2011-03-01

    Full Text Available Introduction: Periodontally af-fected teeth are treated in one of the two ways. (1 Tooth retention after periodontal surgery, in which the degree of regeneration achieved is unpredictable. (2 Tooth extrac-tion and implant placement. Implants have an osseointegrated surface which does not provide adequate shock absorption. Regeneration can be achieved by resecting the crown of the affected tooth and submerging the root. This technique has not had a clinical application so far as the tooth becomes difficult to restore. Placing an implant within the root can make the retained root restorable. At the same time, as the implant is placed within the root surface it achieves a periodontal integration which dampens occlusal forces better than osseointegration. Therefore, such a “tooth retained implant” may serve as an additional treatment option with significant benefits over tooth retention and implant placement alone. The hypothesis: Implants placed within retained roots have shown cementum deposition and attachment of periodontal ligament fibers over their surface. This periodontal attachment may be able to dam-pen forces better than in an osseointegrated implant. Moreover, since an implant is being placed, the crown of the tooth can be resected and submerged. This prevents epithelial migration, allows for the periodontal ligament cells to populate the wound and favors regeneration.Evaluation of the hypothesis: The technique of placing implants within cavities prepared in the root and then submerging them are simple for any practitioner placing implants routinely.

  20. Automating digital leaf measurement: the tooth, the whole tooth, and nothing but the tooth.

    Corney, David P A; Tang, H Lilian; Clark, Jonathan Y; Hu, Yin; Jin, Jing

    2012-01-01

    Many species of plants produce leaves with distinct teeth around their margins. The presence and nature of these teeth can often help botanists to identify species. Moreover, it has long been known that more species native to colder regions have teeth than species native to warmer regions. It has therefore been suggested that fossilized remains of leaves can be used as a proxy for ancient climate reconstruction. Similar studies on living plants can help our understanding of the relationships. The required analysis of leaves typically involves considerable manual effort, which in practice limits the number of leaves that are analyzed, potentially reducing the power of the results. In this work, we describe a novel algorithm to automate the marginal tooth analysis of leaves found in digital images. We demonstrate our methods on a large set of images of whole herbarium specimens collected from Tilia trees (also known as lime, linden or basswood). We chose the genus Tilia as its constituent species have toothed leaves of varied size and shape. In a previous study we extracted c.1600 leaves automatically from a set of c.1100 images. Our new algorithm locates teeth on the margins of such leaves and extracts features such as each tooth's area, perimeter and internal angles, as well as counting them. We evaluate an implementation of our algorithm's performance against a manually analyzed subset of the images. We found that the algorithm achieves an accuracy of 85% for counting teeth and 75% for estimating tooth area. We also demonstrate that the automatically extracted features are sufficient to identify different species of Tilia using a simple linear discriminant analysis, and that the features relating to teeth are the most useful.

  1. Automating digital leaf measurement: the tooth, the whole tooth, and nothing but the tooth.

    David P A Corney

    Full Text Available Many species of plants produce leaves with distinct teeth around their margins. The presence and nature of these teeth can often help botanists to identify species. Moreover, it has long been known that more species native to colder regions have teeth than species native to warmer regions. It has therefore been suggested that fossilized remains of leaves can be used as a proxy for ancient climate reconstruction. Similar studies on living plants can help our understanding of the relationships. The required analysis of leaves typically involves considerable manual effort, which in practice limits the number of leaves that are analyzed, potentially reducing the power of the results. In this work, we describe a novel algorithm to automate the marginal tooth analysis of leaves found in digital images. We demonstrate our methods on a large set of images of whole herbarium specimens collected from Tilia trees (also known as lime, linden or basswood. We chose the genus Tilia as its constituent species have toothed leaves of varied size and shape. In a previous study we extracted c.1600 leaves automatically from a set of c.1100 images. Our new algorithm locates teeth on the margins of such leaves and extracts features such as each tooth's area, perimeter and internal angles, as well as counting them. We evaluate an implementation of our algorithm's performance against a manually analyzed subset of the images. We found that the algorithm achieves an accuracy of 85% for counting teeth and 75% for estimating tooth area. We also demonstrate that the automatically extracted features are sufficient to identify different species of Tilia using a simple linear discriminant analysis, and that the features relating to teeth are the most useful.

  2. Outcomes of impacted mandibular third molar extraction with different tooth separation techniques%不同分牙方式拔除低位阻生下颌第三磨牙的临床效果分析

    董建辉; 朱亚琴

    2011-01-01

    Objective To observe and compare the outcomes of impacted mandibular third molar extraction with different tooth separation techniques. Methods One hundred and fifty low and medial impacted mandibular third molars in 150 patients were selected, and were extracted with traditional hammer and chisel technique ( n = 50), hammer and chisel + "T"typed tooth separation technique ( n = 50) and turbine + "T" typed tooth separation technique ( n = 50), respectively. The incidences of postoperative reactions ( regional swelling and pain) and complications were compared among groups. Results The incidence of severe postoperative regional swelling in patients treated with turbine + "T" typed tooth separation technique was significantly lower than that in those treated with traditional hammer and chisel technique (16% vs 34%, P < 0.05).The incidences of postoperative Ⅲ degree pain in patients with traditional hammer and chisel technique, hammer and chisel +"T" typed tooth separation technique and turbine + "T" typed tooth separation technique were 36%, 20% and 4%,respectively, and there were significant differences among patients treated with different techniques ( P < 0. 05). The incidences of postoperative complications such as numbness of lower lip, extraction of lorum together with dental root and fever in patients treated with hammer and chisel + "T" typed tooth separation technique and turbine + "T" typed tooth separation technique were significantly lower than those in patients treated with traditional hammer and chisel technique (P < 0.05). Conclusion Compared with traditional hammer and chisel technique, turbine + "T" typed tooth separation technique works better in extraction of impacted mandibular third molars with less postoperative reactions and complications.%目的 观察和比较以不同分牙方式拔除低位阻生下颌第三磨牙的临床效果.方法 选取第三磨牙低位水平、近中阻生或完全骨埋伏阻生的150例患者作

  3. Clinical Evaluation of Psychological Suggestion in the Tooth Extraction of College Students%心理暗示干预在大学生人群牙拔除术中的临床评价

    张军; 张敏; 崔勤

    2015-01-01

    Objective:To investigate application of psychological suggestion in the tooth extraction of collegians. Methods:One hundred and eighteen college students who received tooth extraction from 2008.1 to 2012.12 were randomly divided into two groups, which were psychological suggestion group and control group. Each group has 59 cases. The psychological sugges-tion group were received psychological suggestion treatment before the extraction of teeth, and the controlled group were not giv-en any suggestion. It was conducted according to the statistical data from the three ranks which are cool-headed type, dismay type and mixed type. Results:The rate of cool-headed type in the group of psychological suggestion is obviously higher than that of control group (P0.05) . Conclu-sions:The application of psychological suggestion in the tooth extraction can effectively help collegians relieve stress and fear, avoid unnecessary worries, shorten operative time, put an end to the accident, and to ensure the smoothness of operations.%目的:研究和观察心理暗示干预运用在大学生人群牙拔除术中的价值。方法:将我科2008年5月至2012年12月收治的大学生人群中拔牙患者118例随机分为两组,心理暗示干预组及对照组各59例。心理暗示组在拔牙手术前运用心理暗示干预的方法,对照组未行任何暗示,常规手术操作,按照沉稳型、张乱型及混合型三个等级统计数据,进行对比研究。结果:心理暗示组的沉稳型率显著高于对照组(P0.05)。结论:心理暗示干预运用于大学生人群牙拔除术中,可明显降低学生的紧张心理,畏惧程度,消除不必要的担忧,且缩短手术时间,确保手术的顺利进行,杜绝意外发生,意义深远。

  4. Experience in treatment of skeletal Class Ⅲ patients with asymmetric orthodontic tooth extraction%骨性Ⅲ类错牙合不对称拔牙矫治体会

    武月霞; 吉利; 曾琳

    2016-01-01

    Objective To investigate the feasibility of orthodontic treatment of skeletal classⅢwith asymmetric ortho-dontic tooth extraction. Methods A case of patient with skeletal class Ⅲ was examined by the clinical, model, X-ray and other examinations to analyze the causes and problems. The correct plan was made and the straight wire appliance was applied. Mandibular bilateral extraction and unilateral asymmetric tooth extraction method was used to adjust the un-coordinated sagittal relationship between the upper and lower mandible. Results After 25 months of treatment, the pa-tient's profile was improved. There was no skeletal ClassⅢ unique concave type profile appeared and good incisal guide and balanced occlusal relationship was obtained. Conclusion Maxillary teeth reduction of patients with skeletal ClassⅢshould be carefully used. But for some special cases, after a period of the treatment, asymmetric tooth extraction can be applied according to the upper dentition crowding, upper and lower midline and subsequent facial changes.%目的:探讨不对称拔牙方式矫治骨性Ⅲ类错牙合畸形的可行性。方法骨性Ⅲ类错牙合畸形患者1例,经临床、模型、X线片等检查,分析病因及存在的问题,制定矫治方案,使用直丝弓矫治技术,采用下颌双侧拔牙、上颌单侧不对称拔牙矫治的方法,代偿上下颌骨矢状向关系不调。结果经过25个月的治疗,患者侧貌得到改善,且未出现骨性Ⅲ类特有的凹面型,并获得了良好的前牙切导关系及平衡稳定的咬合关系。结论骨性Ⅲ类错牙合畸形患者上颌减数需慎重,可在治疗一段时间后视上颌牙列的拥挤度、上下中线位置、面型后续变化等情况,尝试不对称拔牙的矫治方案。

  5. 智齿冠周炎炎症急性期与缓解期拔牙的疗效%Extraction efficacy on pericoronitis of wisdom tooth between acute and remission phase

    曾彩虹

    2014-01-01

    目的:观察不同时期拔牙术用于智齿冠周炎的实际疗效,探讨最佳治疗时机。方法:选择94例智齿冠周炎患者,随机分为观察组47例及对照组47例,前者采用即刻拔牙术进行治疗,后者待炎症缓解后行拔牙术治疗,记录两组患者手术时间、疗效及不良反应。结果:两组患者拔牙用时无显著性差异(P>0.05),观察组疗效显著优于对照组(P<0.05),抗生素用药时间显著较对照组短(P<0.05)。结论:于智齿冠周炎炎症急性期行拔牙术并未增加手术时间,且显著提升了疗效,减少了抗生素的使用,是一种更为科学合理的治疗方案。%To observe the extracti on efficacy on pericoronitis of wisdom tooth between acute and remission phase in order to explore the best time for treatment. Methods: 94 cases of pericoronitis of wisdom tooth were randomly divided into the observation group and control group(47 cases in each group) in which immediate extraction technique was used in the observation group and extraction technique was used after relieving inflammation . Operative time , efficacy and adverse reactions were observed in two groups . Results:No significant difference(P>0.05) of extraction time in two groups ,the efficacy in the observation group was significantly better than that in the control group(P<0.05),antibiotic treatment time was significantly shorter in the observation group than that in the control group (P<0.05). Conclusion: Immediate extraction technique is a more scientific and reasonable treatment for acute phase of pericoronitis of wisdom tooth,which reduce the operation time and the use of antibiotics.

  6. 关于口腔外科门诊拔牙中严重并发症的临床治疗分析%Analysis and Treatment of Severe Complications of Tooth Extraction in Oral Surgery Clinic

    连卫娜

    2015-01-01

    Objective To analyze severe complications causes and nursing methods of tooth extraction in oral surgery clinic. Methods To select 30 surgical outpatient extraction patients in our hospital from 2011.3 to 2014.3,who were analyzed with data retrospective analysis and find out causes and nursing methods. Results For all patients,mandibular impacted teeth had 12 cases,mandibular fractures had 8 cases,the tooth root tube into the groove nerve had 4 cases,fracture of anesthetic syringe needle in the tissue had 3 cases,postoperative infection had 3cases. Through hospital specific complications treatment,27 cases got recovery and discharge,3cases were cured after follow-up treatment gradually. Conclusion For oral surgery clinic outpatient extraction,it will be necessary to enhance complications nursing,improve treatment measures after tooth extraction in order to prevent complications occurred.%目的:研究口腔外科门诊拔牙出现并发症的原因和具体的护理措施。方法选取本院自2011年3月~2014年3月间收治的30例外科门诊拔牙患者,对其采用资料回顾性分析,研究出现并发症的原因和处理措施。结果所选取的30例口腔外科门诊拔牙下颌阻生牙12例,下颌骨骨折8例,牙尖根部进入槽神经管4例,局麻注射器针头在组织内断裂3例,术后感染3例。经本院具体并发症措施处理之后,所选取的30例患者,27例恢复出院,另外3例经过随访治疗逐渐康复,治愈率达到100%。结论对于门诊的拔牙应加强并发症护理,加强拔牙后的处理,积极预防并发症的发生。

  7. Towards tooth friendly soft drinks.

    Kolahi, Jafar; Fazilati, Mohamad; Kadivar, Mahdi

    2009-10-01

    Most soft drinks contain high concentration of simple carbohydrates and have a pH of 3 or even lower. Therefore, they are harmful for tooth structure. A tooth friendly soft drink (T.F.S.D) should have the following characteristics and elements; fluoride (approximately 1 ppm), casein phosphopeptide-amorphous calcium phosphate (2%), xylitol (4-6g/serving), tea polyphenols (2-4 mg/ml), cranberry extract (250 mg/ml of the flavonoids quercetin and myricetin), sugar free, pH close to 5.5 and super oxygenation (240,000 ppm) vs. carbonation. T.F.S.D can be packaged in a container which gaseous oxygen is dissolved in a liquid in the form of bubbles. However, looking at opportunities for so-called sophisticated soft drinks, T.F.S.D will be an example for a functional and health oriented soft drink.

  8. 老年拔牙手术患者的焦虑与疼痛特征研究%Analysis of the characteristics of anxiety and pain of the elderly patients undergoing tooth extraction operation

    贾皖宁; 扈祚文; 钟文; 汪峰

    2015-01-01

    Objective To study the the characteristics of anxiety and pain of the elderly patients undergoing tooth extraction operation.Methods Eighty elderly patients(elderly group) underwent tooth extraction operation,including 53 males and 27 females,aged from 60 to 85 years,with a mean age of 71.8±8.4 years.While 80 non-elderly patients undergoing tooth extraction operation,including 32 males and 48 females,aged from 14 to 35 years,with a mean age of 24.6± 6.9 years,were enrolled as the controls.The modified dental anxiety scale was used to assess the levels of anxiety.The levels of chewing pain and biting pain of the patients were evaluated by applying Visual Analogue Rating Scale.The data were analyzed and compared between the two groups.Moreover,according to the degrees of anxiety the elderly group was divided into three subgroups:mild anxiety subgroup,moderate anxiety subgroup and severe anxiety subgroup.The relationship between anxiety and pain was analyzed.Results Before tooth extraction operation,compared with the control group,the percentage of severe anxiety and mild anxiety in elderly group were significantly increased (P<0.01).After the tooth extraction operation for 1 day and 2 days,the levels of chewing pain and biting pain were significantly increased in elderly group than those in control group (P<0.05 or P<0.01).After the tooth extraction operation for 1 day,compared with the mild anxiety subgroup,the levels of chewing pain and biting pain in the severe anxiety subgroup and moderate anxiety subgroup were significantly increased (P<0.05 or P<0.01).The levels of chewing pain and biting pain in the severe anxiety subgroup were significantly higher than those of the moderate anxiety subgroup (P<0.05).Conclusions The levels of chewing pain and biting pain in elderly patients after tooth extraction operation are more obviously.Paying attention to the characteristics of anxiety and pain may be of benefit to dental surgery in elderly patients

  9. 拔牙后牙槽骨愈合速度及骨密度变化的横向研究%Mineral density of alveolar bone after tooth extraction in the male and famale

    温宁; 陆怀秀; 王忠义; 刘洪臣; 储冰峰

    2000-01-01

    Objevect :To study the influence of sex on alveolar bone density after tooth extraction. Methods:Dual X-ray absorptiometry was used to measure the mineral density of alveolar bone after extraction of first or second molar in left mandible in the idividuals with different age in 22 males and 22 famales. Results:There was no remarkable difference in the density of alveolar bone between men and women in 35~ 54-year-groups (P>0.05),the alveolar bone density in men was heigher than that in momen in 55~64year-groups. Conclusions:After tooth extraction wound healing of alveolar bone in men is faster than that in women with ageing.%目的:探讨性别差异对拔牙创牙槽骨愈合速度的影响。方法:采用双能x线吸收法测量不同年龄组的男性、女性拔牙后的牙槽骨骨密度。结果:35~54岁之间,男性与女性之间牙槽骨骨密度值无显著差异,而牙槽骨愈合速度有一定差异;55~64岁年龄组男性牙槽骨骨密度值高于女性。结论:年龄、性别对牙槽骨骨密度变化有显著影响,随着年龄的增长,男性牙槽骨愈合速度高于女性。

  10. Simplify Cognitive Wisdom Tooth Extraction of the Medical Humanities Cognitive Methodology%简化认知智齿拔除的医学人文认知方法论辨析

    薛鹏; 熊英虎

    2015-01-01

    Wisdom teeth removal surgery is usually a complex personal experience with quake‐led operation process ,the lacking of classical technique and the latest clinical guidelines constitution .This paper ,to simplify the cognitive strategies related to clinical wisdom tooth extraction summary ,aims to develop a minimum of variables ,easy to learn and control of complex tooth removal guide .Simplifying the design approach is coherent with the value of the extraction operation ,unity and culture ,individuals who experienced the steps to complete the compilation of the clinical pathway paradigm .The full text discussed the clinical strategy to simplify the perception of the four fundamentals ,and then simplified the conflict of interest to be discussed cognitive and ethical conflicts triggered . We believed that adhering to simplify cognitive methodology strategic guidance can avoid many of the processes encountered unexpected problems .From understanding the values of simplicity ,it highlights the aesthetics of minimally invasive surgical tooth extraction ,the whole experience of empathy humanism ,social welfare spread pursue scientific truth of all spiritual aspirations .%复杂智齿拔除术通常是以个人经验与临场应变主导手术进程,缺乏经典技术章程和最新临床指南。本文就简化认知智齿拔除临床策略进行相关总结,其目的是制定变数最小、易学易控的复杂牙拔除指南。简化设计方法是将拔牙操作条理化与数值化、完成步骤的统一化与人文化、个体经验汇编为范式临床路径。全文详细论述了简化认知的临床策略四个基本面,再就简化认知引发的利益矛盾与伦理矛盾予以讨论。我们认为,坚持简化认知方法论战略指导,回避了诸多遭遇性流程意外问题。从简化认识价值观上看,它凸现微创拔牙外科美学、全程共情体验的人本主义、社会公益传播、追寻科学真理的诸精神诉求。

  11. Development of ISRMS for readability of the text of informed consent for tooth extraction%拔牙知情同意书文本易读性ISRMS的开发研究

    王春燕; 虎斌; 马东

    2011-01-01

    介绍了利用Microsoft Office Access对象、窗体控件、ActiveX控件以及Microsoft Visual Basic for Applications(VBA)等功能优势,以拔牙知情同意为模型,开发主观评价医疗知情同意书文本易读性的信息化系统(ISRMS).指出该系统实现了主观评价操作、实验数据同步收集和实验数据分析的计算机信息化,引入了ActiveX控件形式的视觉模拟评分法量规和临床电子牙位记录工具.%We developed the Information-based Subjective Readability Measuring System (ISRMS) for readability of the text of informed consent for tooth extraction by utilizing the advantages of Microsoft Office Access, window control, ActiveX control, and Microsoft Visual Basic for Applications (VBA). This system has realized subjective evaluation, synchronous collection of experiment data, and analysis of experiment data, introduced the visual analogue scale in the form of ActiveX control and the tool for recording clinical electronic tooth position.

  12. Application of acellular dermal matrix embedded in socket after wisdom tooth extraction%脱细胞异体真皮组织补片在智齿拔除中的应用

    白忠诚; 施生根; 李莉莉; 牛忠英; 张艳茹

    2011-01-01

    BACKGROUND: Few reports are found with J-1 acellular dermal matrix to prevent postoperative complications after impactedmandibular third molar extraction.OBJECTIVE: To evaluate the effects of acellular dermal matrix embedded in socket after wisdom tooth extraction.METHODS: 400 patients with impacted mandibular third molar were divided into two groups at random with 200 in each group. Ingroup A, the acellular dermal matrix was embedded in the sockets after wisdom tooth extraction; group B was the blank control.Postoperative complicati ons of the two groups were observed after treatment.RESULTS AND CONCLUSION: No acellular dermal matrix lost from wisdom tooth extraction sokets. Blooding after toothextraction decreased when acellular dermal matrix was embedded in the sokets, hemorrhage incidence rate was lower in group Athan in group B. Acellular dermal matrix could prevent blood clot lose from sockets, and also can prevent food residual enteringinto the sockets. Dry socket incidence rate was lower in group A than group B. Acellular embedded in the sockets had no effectson swelling incidence rate. Acellular dermal matrix embedded in socket after tooth extraction can prevent dry socket andhemorrhage, but can not prevent swelling.%背景:使用J-1型脱细胞异体真皮组织补片覆盖拔牙创口的报告较少.目的:探讨异体脱细胞组织补片置入拔牙窝对预防拔牙后并发症的影响.方法:将400例阻生智齿拔除患者随机分为2组,实验组智齿拔除后拔牙窝内放置医用组织补片;对照组智齿拔除后不放置医用组织补片.分别观察拔牙后组织补片脱落率、肿胀发生率、拔牙窝内血凝块存留和食物残渣残留情况、牙龈是否红肿、对拔牙后出血的影响以及干槽症的发生率.结果与结论:拔牙后出血的百分比,血凝块留存率,拔牙窝内食物残渣残留百分比,干槽症发生率实验组均明显低于对照组.放置组织补片对术后

  13. Characteristics of tooth extraction for the multiracial aged at university community%高校社区多民族老年患者拔牙特点分析

    黄静华; 申玲

    2011-01-01

    Objective: To observe the characteristics of tooth extraction for the multiracial aged patients at university community.Methods: the effective anesthesia and quick operation, with help of psychotherapy were used during the procedure of treatment for the multiracial aged patients. Results: Dental caries and periodontal disease were the majority of fracture with the tooth extraction in 232 cases. The female is higher than the male for caries extraction, the male is higher than the female for periodontal disease extraction, the differences between the male and the female were significant (p<0.05). All of the 232 cases endured the procedure. Conclusions: The multiracial aged patient need more psychological grooming and health education than other, the effective local anesthesia and expertly extraction technology were ensuring secure extraction with the multiracial aged at university community.%目的:探讨高校社区多民族老年患者拔牙特点.方法:对拔牙患者实施心理辅导和卫生宣教,局麻术、拔牙术和术后护理医嘱相结合的方法.结果:232例患者拔牙的主要原因是龋病和牙周病;女性因龋病拔牙的概率高于男性,而男性因牙周病拔牙的概率高于女性,男女在拔牙原因构成比比较,经X2检验有显著性差异(P<0.05); 232例患者全部顺利完成拔牙术.结论:高校社区多民族老年拔牙患者需更多的心理辅导和卫生宣教,完善的局麻和熟练拔牙技术是多民族老年患者安全拔牙的保证.

  14. Clinical effects on the prevention of alveolar bone absorption by site preservation after tooth extraction due to periodontitis%牙周炎患牙位点保存术的临床疗效观察

    孙俊毅; 汪明敏; 董凯; 朱春晖; 刘瑾; 董妍; 李昂

    2016-01-01

    目的:观察位点保存术在牙周炎患牙拔除后牙槽骨量改变的临床效果。方法纳入门诊确诊为牙周炎不能保留的患牙85颗,随机分为2组:①常规拔牙组,40颗患牙,采用传统的牙拔除术;②位点保存组,45颗患牙,经微创拔牙后牙槽窝同期植入Bio-OSS胶原,覆盖Bio-Gide胶原膜并且严密缝合。对比两组患牙的临床疗效,并分别于术前术后行 X线和锥形束CT(cone beam CT,CBCT)影像学检查,评估2组牙槽骨量变化情况及比较牙槽骨的密度情况。结果两组术区均无感染,愈合良好,牙龈质地坚韧,颜色粉红。X线和CBCT结果显示,常规拔牙组牙槽骨水平和垂直吸收增加,位点保存组牙槽骨垂直和水平吸收量显著低于常规拔牙组(P<0.05),术后6月 CBCT显示位点保存组新生骨密度显著高于常规拔牙组。结论位点保存术可有效预防及减少牙周炎患牙拔除后牙槽骨的吸收,改善牙槽骨高度和宽度,成骨效果良好,有利于满足后期的修复需要。%Objective To observe the clinical effects on prevention of alveolar bone absorption by site preservation after tooth extraction due to periodontitis.Methods The experimental group consisted of 40 patients with 45 extracted teeth due to periodontitis.The fresh sockets were immediately grafted and filled with Bio-oss collagen and Bio-Gide after minimally invasive tooth extraction,while 40 teeth of control group were only treated with cotton balls bitten tightly over the socket for half an hour.Two groups were observed for changes in alveolar bone density by X-ray and cone beam CT (CBCT)after 6 months.Results There were the wound healing and no infection in extraction site of all patients with or without site preservation operation.The gingiva of extraction site was pink and tough in all groups.The alveolar bone loss in regular extraction patients significantly increased in horizontal and vertical aspects by X-ray and CBCT,while site

  15. Application of nitrous oxide / oxygen inhalation sedation in tooth extraction of elderly patients with hypertension%氧化亚氮/氧吸入镇静在老年高血压患者拔牙术中的应用

    邵云; 王新河; 苏荣祥; 董迎春; 李刚

    2013-01-01

    目的:探讨氧化亚氮/氧吸入镇静辅助局麻在老年高血压患者拔牙术中的应用价值.方法:选取40例老年高血压患者,年龄70~90岁,随机分为对照组和实验组,每组20例.对照组单纯采用局麻进行手术,实验组采用氧化亚氮/氧吸入镇静配合局麻进行手术.观察2组患者术前、术中和术后收缩压(SBP)、舒张压(DBP)和心率(HR)变化以及术后有无不良反应.应用SPSS 11.0软件包进行t检验.结果:2组患者术前和术后SBP、DBP和HR无显著差异.对照组术中SBP、DBP和HR均显著高于实验组(P<0.05).实验组在整个操作过程中,SBP、DBP和HR比较平稳(P>0.05).结论:氧化亚氮/氧吸入镇静辅助局麻拔牙能够维持老年高血压患者的血流动力学平稳,安全、有效.%PURPOSE:To investigate the safety and efficacy of nitrous oxide/ oxygen inhalation sedation assisted in elderly hypertensive patients under local anesthesia during tooth extraction.METHODS:Forty elderly patients (age ≥ 70years) with hypertension who needed tooth extraction with electrocardiographic monitoring were selected,and divided into experimental and control groups randomly,with 20 patients in each group.The experimental group was treated with nitrous oxide/oxygen inhalation sedation and local anesthesia for surgery,the control group underwent tooth extraction under local anesthesia.Heart rate,blood pressure,as well as differences of operative time in all groups before surgery,during operation and after surgery were observed and compared.SPSS 11.0 software package was used for statistical analysis.RESULTS:The intraoperative HR,BP of patients in the control group was significantly higher than those of patients in the experimental group (P<0.05).HR,BP were relatively stable during the whole procedure in the experimental group.Compared with the control group,surgery was significantly longer in the experimental group (P<0.05).The difference was statistically significant

  16. To Tell the Tooth

    ... To Tell the Tooth Print and Take a Quiz + Watch Videos Dudley and Friends Sesame Street + For Preteens Healthy Habits Nutrition Be a Dentist + For Educators Career Resources Presentations and Resources Smile Smarts Dental Health Curriculum MouthHealthy Kids > Games and Quizzes > To Tell the Tooth To Tell ...

  17. Nasal tooth: case report

    Park, Si Hyun; Kim, Ji Hye; Hwang, Hee Young; Yang, Dal Mo; Kim, Hyung Sik; Park, Chol Heui [Gachon Medical School, Inchon (Korea, Republic of)

    2002-12-01

    Ectopic tooth is not uncommon and usually occurs in the palate and maxillary sinus. We report a case of ectopic tooth located in the nasal cavity, a rare site. The mass depicted by CT was highly attenuated, and central lucency was observed.

  18. 全程护理在老年拔牙患者围手术期的应用%The whole nursing service in the elderly patients with tooth extraction(

    田思维; 陈琼; 范满红

    2015-01-01

    Objective to study the perioperative application and intervention of the whole nursing service in the elderly patients with tooth extraction, in order to improve the operation success rate and nursing cooperation level.Methods According to the eld-erly patients’ psychological and physiological characteristics, make use of health education, psychological intervention, ECG moni-toring and nursing cooperation means, the whole nursing service was applied during the perioperative period.Results All patients were successfully completed dental surgery, no accidents happened.Conclusions With adequate assessment and preparation of these patients, and the cooperation of the medical team, and the implementation of the whole nursing service, it is of great signifi-cance to ensure the security of the elderly patients with tooth extraction.%目的:探讨全程护理在老年拔牙患者围手术期的应用和干预,以提高手术成功率和护理配合水平。方法根据老年患者心理生理特点,运用健康教育、心理干预、心电监护及手术配合等护理手段,对其拔牙围手术期进行全程护理。结果所有患者顺利完成拔牙手术,无意外事件发生。结论对该类患者进行充分的评估和准备,医护团队配合并实施全程护理干预,对确保老年拔牙患者安全具有重要意义。

  19. The design of tooth extraction for the patients with or without congenital upper lateral incisor missing for ortho-dontic treatment%上颌侧切牙先天缺失病例的拔牙矫治设计

    张月兰; 时毅; 董莹丽

    2012-01-01

    纳入患者40例,其中上颌侧切牙缺失的正畸患者20例,根据缺牙部位以及拔牙模式不同分3组;将需要常规拔牙的患者20例设为第四组,均采用直丝弓矫治技术,第一、二、三组在矫治后期将尖牙进行调磨或瓷贴面修复.测量矫治前后模型的Bolton 指数,第一、二、三组测量时将前磨牙纳入前牙量范畴.将第一、二、三组与第四组进行统计学比较,两两之间均无统计学差异(P>0.05).对于上颌侧切牙先天缺失或过小畸形设计拔牙矫治可以取得满意效果.%20 patients with congenital upper lateral incisor missing were included and divided into three groups according to the location of missing teeth and the design of tooth extraction. Another 20 cases without tooth missing were included into group Four. In group one, two, three and Four 3,2,1 and 4 premolars were extracted respectively before orthodontic treatment. After orthodontic treatment the canines were grinded or repaired by porcelain veneer in group 1 - 3. Bolton ratio was measured on the models before and after treatment. There were no significance difference between group 4 and 1, 2 or 3.

  20. A Clinical Study of Extracting Third Molar Tooth Germ with the use of Piezosurgery and Turbine Dental Drill%超声骨刀高速牙钻拔除第3磨牙牙胚

    郑杰; 王雷; 黄天鉴; 刘力佳; 杜玉芳; 陈红

    2012-01-01

      To explore the apply of the use of Piezosurgery and turbine dental drill in extracting third molar tooth germ. Methods: The data of 160 tooth extractions were analyzed, which include experimental group and control group.Results:In experimental group, operation complications were 1 example, after operation complications were 9 example. Adopt another method, operation complications were 11 example, after operation complications were 22 example.Two sets of method were significantly different (P<0.01) . the operating time of two method were no different. Conclusions:To pull out third molar tooth germ use the piezosurgery and turbine dental drill, the wound is small, apply accurate, be easy to a protection, can lower complications.%  目的:探讨超声骨刀与高速涡轮牙钻在第3磨牙牙胚拔除术中的应用效果.方法:选取需拔除的第3磨牙牙胚160例,随机分为超声骨刀+高速涡轮牙钻的实验组与高速涡轮牙钻对照组.对其术中、术后并发症产生的原因进行分析.结果:实验组术中并发症1例,术后并发症9例.对照组术中并发症11例,术后并发症22例,2组方法差异显著(P<0.01).手术完成时间实验组为38.71±19.58分钟,对照组为37.56±18.69分钟,2组无显著差异.结论:超声骨刀+高速涡轮牙钻拔除下颌阻生智齿,手术创伤小、神经及软组织保护性好、施力准确、易于控制,可大大降低术中、术后并发症.

  1. Storing tooth segments for optimal esthetics

    Tuzuner, T.; Turgut, S.; Özen, B.; Kılınç, H.; Bagis, B.

    2016-01-01

    Objective: A fractured whole crown segment can be reattached to its remnant; crowns from extracted teeth may be used as pontics in splinting techniques. We aimed to evaluate the effect of different storage solutions on tooth segment optical properties after different durations. Study design: Sixty c

  2. Children supernumerary tooth extraction surgery using minimally invasive techniques Effect%儿童埋伏多生牙拔除术中采用微创技术的效果观察

    李继东

    2016-01-01

    Objective To investigate the minimally invasive technique used in children supernumerary tooth extraction surgery patients. Methods in our hospital from November 2013 to November 2015 admitted supernumerary teeth in children 60 cases were randomly divided into two groups, 30 cases each. The control group using traditional extraction, minimally invasive extraction observation group, two groups were compared operative time, intraoperative complications incidence and fear. Results The operative time was shorter than the control group, the difference was significant (P<0.05); the observation group surgery fear was lower than the control group, the difference was significant (P <0.05); the observation group postoperative pain, adjacent teeth damage and soft tissue swelling rate than the control group, the difference was significant (P<0.05). Conclusion The minimally invasive technique used in children supernumerary tooth extraction surgery can significantly shorten the operation time and reduce postoperative pain in children, reduce the incidence of complications.%目的:探讨微创技术应用于儿童埋伏多生牙拔除术中的疗效。方法选取我院2013年11月至2015年11月收治的埋伏多生牙患儿60例,随机分为两组,各30例。对照组采用传统拔牙,观察组采用微创拔牙,对比两组手术时间、术中畏惧发生率和并发症情况。结果观察组手术时间短于对照组,差异显著(P<0.05);观察组术中畏惧发生率低于对照组,差异显著(P<0.05);观察组术后疼痛、邻牙损伤和软组织肿胀发生率低于对照组,差异显著(P<0.05)。结论微创技术应用于儿童埋伏多生牙拔除术中可明显缩短手术时间,减轻患儿术后疼痛,降低并发症发生率。

  3. The influence of Aloe vera and xenograft XCB toward of bone morpho protein 2 BMP2 expression and amount of osteoblast of alveolar bone induced into tooth extraction sockets Cavia cobaya

    Utari Kresnoadi

    2014-12-01

    Full Text Available Tooth extraction can cause inflammation leading to alveolar ridge resorption. In addition, prominent ridge has crucial role for making denture su-ccessfully. Thus, socket preservation is needed to prevent greater alveolar ridge resorption. An innovative material, a combination of Aloe vera and xe-nograft (XCB, is then considered as a biogenic stimulator that can reduce inflammation, as a result, the growth of alveolar bone is expected to be impro-ved. This research is aimed to prove whether the mixture of Aloe vera and xenograft can stimulate BMP2 and increase osteoblasts. Forty-eight Cavia co-baya animals were divided into eight groups each of which consisted of six animals. The mandibular incisors of those Cavia cobaya animals were then extracted and filled with PEG as Group Control, XCB as Group XCB, Aloe vera as Group Aloe vera, and a combination of Aloe vera +XCB as Group Aloe vera +XCB. Next, the first four groups were sacrificed seven days after extraction, and the second four groups were sacrificed 30 days after extrac-tion. And then, immunohistochemical and histopathology examinations were conducted to examine BMP2 expression and osteoblasts. Based on the re-sult known that the mixture of Aloe vera and xenograft can increase BMP2 expression and amount of osteoblasts. It can be concluded that the mixture of Aloe vera and xenograft can increase BMP2 expression and amount of osteoblast cel . It can be used as an alternative material to increase the growth of alveolar bone after extraction.

  4. Decellularized Tooth Bud Scaffolds for Tooth Regeneration.

    Zhang, W; Vazquez, B; Oreadi, D; Yelick, P C

    2017-01-01

    Whole tooth regeneration approaches currently are limited by our inability to bioengineer full-sized, living replacement teeth. Recently, decellularized organ scaffolds have shown promise for applications in regenerative medicine by providing a natural extracellular matrix environment that promotes cell attachment and tissue-specific differentiation leading to full-sized organ regeneration. We hypothesize that decellularized tooth buds (dTBs) created from unerupted porcine tooth buds (TBs) can be used to guide reseeded dental cell differentiation to form whole bioengineered teeth, thereby providing a potential off-the-shelf scaffold for whole tooth regeneration. Porcine TBs were harvested from discarded 6-mo-old pig jaws, and decellularized by successive sodium dodecyl sulfate/Triton-X cycles. Four types of replicate implants were used in this study: 1) acellular dTBs; 2) recellularized dTBs seeded with porcine dental epithelial cells, human dental pulp cells, and human umbilical vein endothelial cells (recell-dTBs); 3) dTBs seeded with bone morphogenetic protein (BMP)-2 (dTB-BMPs); and 4) freshly isolated nondecellularized natural TBs (nTBs). Replicate samples were implanted into the mandibles of host Yucatan mini-pigs and grown for 3 or 6 mo. Harvested mandibles with implanted TB constructs were fixed in formalin, decalcified, embedded in paraffin, sectioned, and analyzed via histological methods. Micro-computed tomography (CT) analysis was performed on harvested 6-mo samples prior to decalcification. All harvested constructs exhibited a high degree of cellularity. Significant production of organized dentin and enamel-like tissues was observed in dTB-recell and nTB implants, but not in dTB or dTB-BMP implants. Micro-CT analyses of 6-mo implants showed the formation of organized, bioengineered teeth of comparable size to natural teeth. To our knowledge, these results are the first to describe the potential use of dTBs for functional whole tooth regeneration.

  5. Application of intranasal dexmedetomidine sedation in tooth extraction of elderly outpatient%右美托咪定滴鼻镇静在门诊老年患者拔牙术中的应用∗

    杨阳; 李思思; 郁葱

    2015-01-01

    Objective To evaluate the safety and efficacy of intranasal dexmedetomidine and nitrous oxide/oxygen inhalation sedation assisted in tooth extraction in elderly outpatients.Methods Sixty elderly patients who need tooth extraction were divided into two groups,with 30 patients in each group.The groupⅠwas treated with nitrous oxide/oxygen inhalation sedation,and the groupⅡwas treated with intranasal dexmedetomidine and nitrous oxide/oxygen inhalation sedation.Recording those signs basis val-ue(T0 ),during the injection(T1 ),during the extraction(T2 ),10 min after extraction(T3 ):vital signs,Ramsay sedation score,anxie-ty score,VAS pain score and patients′degree of satisfaction.Results In groupⅡ,patients′degree of satisfaction were significantly higher than groupⅠ(P<0.05)after operation.The VAS pain scores and anxiety scores of groupⅡwere significantly lower than groupⅠ in T1 and T2 (P<0.05).In T2 ,group Ⅱ had lower heart rates (P<0.05).In T2 ,Ramsay score of group Ⅱ was higher than group Ⅰ(P<0.01).Conclusion Intranasal dexmedetomidine and nitrous oxide/oxygen inhalation sedation can be a safe and effective anesthetic method in tooth extraction of elderly patients.%目的:评价右美托咪定滴鼻结合笑/氧吸入镇静在老年患者拔牙术中的安全性和有效性。方法60例门诊老年患者拔牙患者分成两组(n=30),Ⅰ组(笑/氧吸入镇静);Ⅱ组(右美托咪定滴鼻结合笑/氧吸入镇静)。记录患者基础值(T0)、局部麻醉时(T1)、拔牙时(T2)、拔牙后10 min(T3)生命体征,Ramsay镇静评分,焦虑评分,视觉模拟评分法(VAS)评分,术后患者满意度评分。结果术后患者满意度Ⅱ组高于Ⅰ组(P<0.05)。T1时,Ⅱ组患者焦虑评分,VAS 评分均低于Ⅰ组,差异有统计学意义(P<0.05);T2时,Ⅱ组患者镇静程度高,Ramsay镇静评分高于Ⅰ组(P<0.01),焦虑评分、VAS 评分低于Ⅰ组(P<0.05)。T2时,Ⅱ组心率低于Ⅰ组(P<0.05)。结论右美托咪定滴鼻结

  6. The Observation of Anaesthesia Effect of Primacaine on Tooth Extraction in Children Orthodontics%碧兰麻在儿童正畸病例拔牙术中的麻醉效果观察

    蒋昕; 杜静冰; 孔耀

    2013-01-01

    Objective:To explore the application and the anaesthetic effect of primacaine on tooth extraction in children orthodontics.Method:96 malocclusion children who were designed to pull out four premolar teeth were selected.A total of 384 teeth,the four teeth were extracted in twice and the same name of one side were pulled out in the same term.The patients were divided into two group randomly:48 cases of primacaine group were infiltration anaesthetized with primacaine.48 cases of the lidocaine group were block anesthetized with Lidocaine.Extracted the tooth after anesthesia.The duration of anesthesia and the anesthetic effect were observed and recorded.Then compared and analyzed.Result:The onset time of the primacaine group was shorter than the lidocaine group(P<0.01).The duration of anesthesia of the primacaine group was longer than the lidocaine group(P<0.01).The holonarcosis rate of the primacaine group was hisher than that of the lidocaine group(P<0.05).Conclusion:Primacaine used in children orthodontic extraction was short onset time, long duration,good analgesic effects and less side-effect.Primacaine shoud be the first choice of local anesthetic in children orthodontic of tooth extraction.%  目的:应用碧兰麻对儿童正畸的拔牙病例实施局部浸润麻醉下拔牙术,观察其麻醉效果。方法:选取需拔除四颗前磨牙进行正畸治疗的儿童96例,共计384颗牙,分两次拔牙,每次将单颌两侧对称的前磨牙同期拔除。对拔牙术实施的局部麻醉随机分为两组,一侧设计为碧兰麻组48例采用碧兰麻局部浸润麻醉,另一侧设计为利多卡因组48例采用利多卡因局部阻滞麻醉。麻醉起效后开始拔牙,观察记录麻醉时间、麻醉效果,并进行对比分析。结果:碧兰麻组的麻醉起效时间短于利多卡因组(P<0.01),而麻醉持续时间长于利多卡因组(P<0.01);碧兰麻组的麻醉完全率高于利多卡因组(P<0.01)。结

  7. Maxillary tooth displacement in the infratemporal fossa

    Korosh Roshanghias

    2016-01-01

    Full Text Available Wisdom tooth operations are sometimes accompanied by complications. This case report shows complications during upper jaw third molar removal. Expectable problems during oral surgery should be planned to be solved in advance. Displacement of the third molar during oral surgeries as a considerable complication is rarely discussed scientifically. A good design of flap, adequate power for extraction, and clear view on the surgical field are crucial. Three-dimensional radiographic diagnostics in terms of cone beam computed tomography is helpful after tooth displacement into the infratemporal fossa.

  8. The study of tooth extractions for patients taking Aspirin for a Long-Term. XIONG Lei%长期服用阿司匹林对拔牙手术的影响

    熊磊; 贺国权

    2014-01-01

    Objective:To investigate the effective way to avoid drug discontinuance for patients with anticoagulant treatment. Method:Data of 60 patients (105 teeth)was analyzed from the respect of preparation before operation as well as postoperative care. Result:Different treatments including compression,suture and gelatin were carried out according to the condition after tooth extraction,and all the patients had no serious bleeding or healing problems. Conclusion:Proper preop-erative preparation,careful operation and postoperative care can certainly avoid possibility of severe bleeding after tooth ex-traction.%目的:探讨长期小剂量服用阿司匹林进行抗凝治疗的拔牙患者,在不停止服药情况下实施拔牙手术的处理措施。方法:对60例(105颗牙)不停用阿司匹林的拔牙患者进行回顾分析,从术前检查、术中操作及术后处理进行总结。结果:根据患者拔牙数目和拔牙创情况,选择消毒纱布压迫止血、缝合止血或明胶海绵+缝合止血等不同处理措施,均能达到良好的止血效果和创口愈合。结论:对于长期小剂量服用阿司匹林患者,拔牙手术前不停药,详细的术前检查、熟练的操作以及妥善的术后处理完全可以避免可能的出血风险。

  9. Maxillary sinus floor extension and posterior tooth inclination in adolescent patients with Class II Division 1 malocclusion treated with maxillary first molar extractions

    Livas, Christos; Halazonetis, Demetrios J.; Booij, Johan Willem; Pandis, Nikolaos; Tu, Yu-Kang; Katsaros, Christos

    2013-01-01

    Introduction: Our objective was to investigate potential associations between maxillary sinus floor extension and inclination of maxillary second premolars and second molars in patients with Class II Division 1 malocclusion whose orthodontic treatment included maxillary first molar extractions. Meth

  10. Maxillary sinus floor extension and posterior tooth inclination in adolescent patients with Class II Division 1 malocclusion treated with maxillary first molar extractions

    Livas, C.; Halazonetis, D.J.; Booij, J.W.; Pandis, N.; Tu, Y.K.; Katsaros, C.

    2013-01-01

    INTRODUCTION: Our objective was to investigate potential associations between maxillary sinus floor extension and inclination of maxillary second premolars and second molars in patients with Class II Division 1 malocclusion whose orthodontic treatment included maxillary first molar extractions. METH

  11. 日间门诊全麻下拔牙的临床应用及评价%Tooth Extraction Under General Anesthesia in Outpatient Department: A Retrospective Study with 18 Cases

    张智勇; 张晓; 王德蕙; 高巍; 陈全; 刘文曙; 姜霞

    2012-01-01

    目的:回顾性分析日间门诊全麻下拔牙的病例资料,总结日间门诊全麻下拔牙的麻醉特点、诊疗规范、手术特点和安全性.方法:收集日间门诊全麻下拔牙病例,总结选择全麻的原因、拔除牙位、离院评价得分,分析日间门诊全麻下拔牙的麻醉特点、手术特点.根据术中情况和术后复查分析该方法的安全性.结果:共收集18个病例,男11例,女7例,年龄7~50岁.选择全麻的原因包括:无法配合手术的儿童、智障、癫痫、咽部敏感、局麻药物过敏和有紧张晕厥病史.拔除牙位主要是阻生智齿和埋伏多生牙,均采用气管内插管静吸复合麻醉.所有病例手术顺利并安全离院,离院标准评分均在13分以上.结论:严格遵从诊疗规范的情况下,日间门诊全麻下拔牙对因各种原因无法配合局麻下手术的患者是一种安全有效的治疗方法.%Objective: To evaluate the indication and security of tooth extraction under general anesthesia in outpatient department. Methods: The patients accepted tooth extractions under general anesthesia in outpatient department were included in this study. The following information were recorded and summed, including: the reason for choosing general anesthesia, the position of the teeth removed and the score of postanesthetic discharge scoring system. Results: 18 cases were collected in this study. There were 11 male and 7 females, and the range of the age was from 7 to 50 years. The reasons for choosing general anesthesia including: children cannot corporate, falling sickness, mentally challenged, pharynx sensitivity, allergenic to local anesthesia drug and patients have swoon history because of overmuch nervous in dentistry treatment. The major positions of the teeth extracted were impacted teeth and supernumerary teeth. All patients accepted endotracheal intubation intravenous -inhalation combined anesthesia. All the operations were performed successfully and all

  12. 复杂拔牙患者对护士能力期望的质性研究%Qualitative Research on Expectations of Nurses’ Capacities from Patients with Complicated Tooth Extraction

    黄小兰; 高姗; 莫梦师

    2013-01-01

      目的探讨复杂拔牙患者对护士能力的期望和要求。方法采用质性研究中的现象学研究法,通过立意取样及半结构式提纲,对20例复杂拔牙患者进行深度访谈,将获取的资料进行笔录、整理、分析并提炼出主题。结果复杂拔牙患者对护士能力的期望有6个主题:即沟通能力,业务能力,应急能力,自主学习和创新能力,教育能力,心理调适和情绪调节能力。结论针对复杂拔牙患者对护士能力的期望,需注意培养护士良好沟通能力,不断提高业务素质,加强交叉学科知识的学习和实践。%Objective To explore the expectations and requirements of nurses’ capacities from patients with complicated tooth extraction. Methods With phenomenological method in qualitative research and through purposive sampling and semi-structural outline, a in-depth interview on 20 patients with complicated extractions was conducted, the result of which was recorded, assorted and analyzed, then the theme was refined. Results The expectations of the nurses’ capacities were featured by six themes:communicative capacity, professional capacity, contingency capacity, self-learning and innovative capacities, educational capacity, psychological adaptation and mood adjustment capacities. Conclusion The expectations of nurses’ capacities from patients with complicated tooth extraction indicates that good communication capacity is a necessarity for nurses, who should attach great importance to the knowledge from interdisciplines to improve their capacities.

  13. Improved application of a 45° angle turbine drill in impacted wisdom tooth extraction%45°涡轮钻在第三磨牙拔除术中的改良应用

    蔡勇涛; 罗顺云; 李旭艳

    2013-01-01

    Objective???To?compare?the?effect?of?traditional?turbine?drilling?applications?and?submersible?drilling?conjunction?with?triangular?gingival?cutting?in?complex?wisdom?tooth?extraction.?Methods ??Sixty-four?cases?of?lower?impacted?wisdom?teeth?were?randomly?divided?into?two?groups?of?32:?Experimental?and?control.?The?traditional?turbine?drill?extraction?method?was?used?in?the?control?group,?whereas?submersible?drilling?conjunction?with?triangular?gingival?cutting?was?employed?in?the?experimental?group.?Surgical?time?and?postoperative?complications?were?recorded?for?statistical?analysis. Results The?average?operative?times?for?the?experimental?and?control?groups?were?26.1?and?36.3?min,?respectively.?A?significant?difference?in?the?time?of?surgery,?postoperative?pain,?postoperative?swelling,?and?trismus?was?found?between?the?experimental?and?control?groups(P0.05).?Conclusion ??Submersible?drilling?conjunction?with?triangular?gingival?cutting?is?an?effective?method?of?complex?impacted?wisdom?tooth?extraction?because?it?can?shorten?the?operation?time,?lessen?postoperative?pain?and?swelling,?and?limit?mouth?opening.%目的比较传统涡轮钻法与潜钻法配合三角切龈在复杂阻生第三磨牙拔除中的效果。方法将64颗水平低位阻生第三磨牙随机平分为试验组和对照组,每组各32例。对照组采用传统涡轮钻拔牙方法,试验组采用三角切龈并潜钻法拔除第三磨牙,记录手术时间及术后并发症等,并对其行统计学分析。结果试验组与对照组的平均手术时间分别为26.1 min和36.3 min。两组在手术时间、术后疼痛、术后肿胀、张口受限方面,试验组均优于对照组(P0.05)。结论潜钻法配合三角切龈是对传统涡轮钻拔牙方法的有效改进,可缩短手术时间,减少术后疼痛、肿胀及张口受限,减小创伤。

  14. Tooth Germ-Like Construct Transplantation for Whole-Tooth Regeneration: An In Vivo Study in the Miniature Pig.

    Yang, Kai-Chiang; Kitamura, Yutaka; Wu, Chang-Chin; Chang, Hao-Hueng; Ling, Thai-Yen; Kuo, Tzong-Fu

    2016-04-01

    The purpose of this study was to demonstrate the feasibility of whole-tooth regeneration using a tooth germ-like construct. Dental pulp from upper incisors, canines, premolars, and molars were extracted from sexually mature miniature pigs. Pulp tissues were cultured and expanded in vitro to obtain dental pulp stem cells (DPSCs), and cells were differentiated into odontoblasts and osteoblasts. Epithelial cells were isolated from gingival epithelium. The epithelial cells, odontoblasts, and osteoblasts were seeded onto the surface, upper, and lower layers, respectively, of a bioactive scaffold. The lower first and second molar tooth germs were removed bilaterally and the layered cell/scaffold constructs were transplanted to the mandibular alveolar socket of a pig. At 13.5 months postimplantation, seven of eight pigs developed two teeth with crown, root, and pulp structures. Enamel-like tissues, dentin, cementum, odontoblasts, and periodontal tissues were found upon histological inspection. The regenerated tooth expressed dentin matrix protein-1 and osteopontin. All pigs had regenerated molar teeth regardless of the original tooth used to procure the DPSCs. Pigs that had tooth germs removed or who received empty scaffolds did not develop teeth. Although periodontal ligaments were generated, ankylosis was found in some animals. This study revealed that implantation of a tooth germ-like structure generated a complete tooth with a high success rate. The implant location may influence the morphology of the regenerated tooth.

  15. Analysis on patients'' cognition of using antibiotics after tooth extraction%患者对拔牙术后抗生素使用的认知调查分析

    陈俊良; 何芸; 赵威

    2016-01-01

    目的 通过探讨患者对拔牙术后抗生素使用的认知情况,促进抗生素的合理使用.方法 选取2015年1~4月期间到四川医科大学附属口腔医院口腔颌面外科门诊就诊的健康成年拔牙患者,完成问卷调查.采用χ2检验,分别分析问题答案是否与年龄,性别和教育程度有关.结果 收回完整问卷调查共978份,有842例患者(86.1%)希望拔牙术后医生开具抗生素,674例患者(69.9%)会在医生未开具抗菌素的时候要求医生开,因为他们认为使用抗生素可以预防术后感染.901例患者(92.1%)因为牙龈肿胀就诊的时候,会要求医生使用抗生素,62.0%的患者(606/978)在牙痛就诊的时候会要求医生开具抗生素,64.0%的患者(626/978)曾经在感冒时要求医生开具抗生素.年龄、性别和受教育程度对这些问题答案的影响差异无统计学意义(P>0.05).结论 大部分患者对于常规拔牙术后抗生素使用的认知不足,需要加强抗生素知识的宣教和普及.%Objective To evaluate patients' cognition of using antibiotics after tooth extraction for accelerating the correct application of antibiotics. Methods From January to April in 2015, male patients treated in the Department of Oral and Maxillofacial Surgery, the Hospital of Stomatology, Sichuan Medical University for routine exodontia were requested to complete a questionnaire. The positive and negative answers to the questions were analyzed for possible cor-relations with the age, gender and level of education using Chi-square test. Results The study included a total of 978 patients. According to the questionnaire, 842 patients (86.1%) expected to receive antibiotics after tooth extraction, among which 674 would ask for antibiotics if not prescribed for reason of preventing postoperative infection. More pa-tients [901 (92.1%)] expected to be prescribed antibiotics if they had a dental abscess compared with those (62.0%) had a toothache. 64.0%patients had ever asked

  16. Clinical safety evaluation of tooth extraction under electrocardiographic monitoring for patients with cardiovascular diseases%心血管病患者在心电监护下拔牙的安全性临床评价

    曲素丽; 马钧; 常静; 李罗玉; 王强

    2012-01-01

    目的 探讨心电监护提高心血管疾病患者拔牙安全性的作用.方法 对290例心血管病患者(非健康组)及100例无心血管病的患者(健康组)在拔牙过程中全程心电监护,分别观察两组患者拔牙过程中心率、血压、血氧饱和度、心电图的变化.结果 无论患者是否伴有心血管疾病,在麻醉中及拔牙中,血压显著升高(P<0.01),心率显著加快(P<0.01),但血压组间差异无统计学意义;心率在拔牙中组间差异有统计学意义(P<0.01);血氧饱和度和心电图变化组间差异有统计学意义(P<0.01),即伴有心血管疾病的患者出现血氧饱和度降低和出现心律失常的比例明显高于无心血管疾病的患者.并且非健康组术中一过性ST-T改变较多,而健康组术中未出现ST-T改变.结论 心血管病患者在心电监护下接受拔牙手术能够明显提高安全性,具有一定的必要性.%Objective To study the safety and necessity of using electrocardiographs monitoring for patients with-cardiovascular disease during tooth extraction. Methods Important cardiovascular features, such as heart rate, blood pressure, blood oxygen saturation and electrocardiogram, were monitored for 290 cardiovascular disease patients (non-healthy group) and 100 non-cardiovascular disease patients (healthy group) during the process of tooth extraction. The data were analyzed. Results Blood pressure and heart rate of both groups were significantly increased in the process of anesthesia and during the procedure (P 0.05); Heart rate was significantly increased in the process of procedure (P < 0.01); while on the contrary, there were significant difference in blood oxygen saturation between the two groups during the procedure (P < 0.01). In addition, the ECGs of both groups were significantly different (P < 0.01). The proportion of blood oxygen saturation decline and arrhythmia in the non-healthy group were much higher than those in the healthy group

  17. The effect of permanent grafting materials on the preservation of the buccal bone plate after tooth extraction: an experimental study in the dog.

    Bashara, Haitham

    2012-08-01

    The aim of the present study was to evaluate the effects of a novel bone substitute system (Natix(®)), consisting of porous titanium granules (PTG) and a bovine-derived xenograft (Bio-Oss(®)), on hard tissue remodelling following their placement into fresh extraction sockets in dogs.

  18. Functional tooth regenerative therapy: tooth tissue regeneration and whole-tooth replacement.

    Oshima, Masamitsu; Tsuji, Takashi

    2014-07-01

    Oral and general health is compromised by irreversible dental problems, including dental caries, periodontal disease and tooth injury. Regenerative therapy for tooth tissue repair and whole-tooth replacement is currently considered a novel therapeutic concept with the potential for the full recovery of tooth function. Several types of stem cells and cell-activating cytokines have been identified in oral tissues. These cells are thought to be candidate cell sources for tooth tissue regenerative therapies because they have the ability to differentiate into tooth tissues in vitro and in vivo. Whole-tooth replacement therapy is regarded as an important model for the development of an organ regenerative concept. A novel three-dimensional cell-manipulation method, designated the organ germ method, has been developed to recapitulate organogenesis. This method involves compartmentalisation of epithelial and mesenchymal cells at a high cell density to mimic multicellular assembly conditions and epithelial-mesenchymal interactions. A bioengineered tooth germ can generate a structurally correct tooth in vitro and erupt successfully with the correct tooth structure when transplanted into the oral cavity. We have ectopically generated a bioengineered tooth unit composed of a mature tooth, periodontal ligament and alveolar bone, and that tooth unit was successfully engrafted into an adult jawbone through bone integration. Such bioengineered teeth were able to perform normal physiological tooth functions, such as developing a masticatory potential in response to mechanical stress and a perceptive potential for noxious stimuli. In this review, we describe recent findings and technologies underpinning tooth regenerative therapy.

  19. Posterior tooth replacement with dental implants in sites augmented with rhBMP-2 at time of extraction--a case series.

    Levin, Barry P; Tawil, Peter

    2012-02-01

    This case series demonstrates seven molar-site implants placed in six consecutively treated patients. All sites were augmented with rhBMP-2 (1.50 mg/cc)/ACS (recombinant human Bone Morphogenetic Protein-2/Absorbable Collagen Sponge) at extraction to regenerate bone-facilitating implant placement. In four patients, osteotomies were initiated with trephines to evaluate qualitatively for native bone and for the absence of residual ACS. All sites facilitated implant placement after augmentation. All seven implants achieved primary stabilization and were functionally loaded. No implants were lost or developed complications. It can be concluded that augmenting molar extraction sockets with rhBMP-2/ACS can allow standard implant placement in the posterior dentition that is capable of withstanding a functional load.

  20. 涡轮钻法与骨凿法拔除下颌阻生齿的临床观察%Comparison of high-speed turbine drill and osteotome in mandible impacted tooth extraction

    王秀珍

    2012-01-01

      目的比较涡轮钻法与骨凿法拔除下颌近中阻生齿的临床疗效.方法选取我科2010年1月—2011年12月要求拔除下颌阻生齿124例患者,共148颗患牙,随机分为骨凿法组62例74颗患牙,涡轮钻组62例74颗患牙.比较两种方法拔除所需的时间、拔除后疼痛的程度、肿胀的程度、张口受限度临牙损伤、下颌关节疼痛等情况.结果两种方法拔除的术后反应有显著性差异(P<0.05).结论高速涡轮钻拔除下颌阻生齿较传统骨凿法手术时间短,术后反应轻.%  Objective To compare the clinical effect of high-speed turbine drill and osteotome in mandible impacted tooth extraction. Methods 148 mandible impacted teeth in 124 patients were randomly assigned to two groups:One group(containing 74 teeth) was extracted by high-speed turbine drill and the other group(containing 74 teeth)was extracted by traditional chisel. Then the clinical reaction including duration of extraction,the level of aches, swell and opening of mouth, incidence of adjacent dent trauma and low jaw pain between the two methods were evaluated. Results There were significant differences in postoperation reaction between two groups (P<0.05). Conclusion High-speed turbine drill applied in extraction of impacted teeth is better than the method of osteotome with little duration and fewer postoperation reaction.

  1. Biomaterial selection for tooth regeneration.

    Yuan, Zhenglin; Nie, Hemin; Wang, Shuang; Lee, Chang Hun; Li, Ang; Fu, Susan Y; Zhou, Hong; Chen, Lili; Mao, Jeremy J

    2011-10-01

    Biomaterials are native or synthetic polymers that act as carriers for drug delivery or scaffolds for tissue regeneration. When implanted in vivo, biomaterials should be nontoxic and exert intended functions. For tooth regeneration, biomaterials have primarily served as a scaffold for (1) transplanted stem cells and/or (2) recruitment of endogenous stem cells. This article critically synthesizes our knowledge of biomaterial use in tooth regeneration, including the selection of native and/or synthetic polymers, three-dimensional scaffold fabrication, stem cell transplantation, and stem cell homing. A tooth is a complex biological organ. Tooth loss represents the most common organ failure. Tooth regeneration encompasses not only regrowth of an entire tooth as an organ, but also biological restoration of individual components of the tooth including enamel, dentin, cementum, or dental pulp. Regeneration of tooth root represents perhaps more near-term opportunities than the regeneration of the whole tooth. In the adult, a tooth owes its biological vitality, arguably more, to the root than the crown. Biomaterials are indispensible for the regeneration of tooth root, tooth crown, dental pulp, or an entire tooth.

  2. 从“牙拔除术知情同意书”的签署中看医患关系%Analyzing the Doctor-patient Relationship via the "Tooth Extraction Informed Consent" Singing

    赵亮; 李洁; 蔡丽萍

    2012-01-01

    The tooth extraction informed consent should be signed before operation. From the perspective of the singing process of the informed consent, this paper explored the contradiction points between doctors and patients and put forward the harmonious doctor - patient relationship must be established on the basis of the constant optimization of the health care system, the mutual cooperation, trust and benefit. Only through doctors'selfless devotion and patients'respect and understanding can the harmonious relationship be established.%患者在牙拔除术前均应签署“牙拔除术知情同意书”.从医患双方不同的角度探讨知情同意书签署过程中的矛盾点,提出和谐医患关系的建立是在医疗体制不断优化完善的基础上,需要医患双方相互合作、互相信任和互惠互利.通过医方真诚的服务并取得患方的尊重和理解,才能建立和谐的医患关系.

  3. 3D Simulation Modeling of the Tooth Wear Process.

    Dai, Ning; Hu, Jian; Liu, Hao

    2015-01-01

    Severe tooth wear is the most common non-caries dental disease, and it can seriously affect oral health. Studying the tooth wear process is time-consuming and difficult, and technological tools are frequently lacking. This paper presents a novel method of digital simulation modeling that represents a new way to study tooth wear. First, a feature extraction algorithm is used to obtain anatomical feature points of the tooth without attrition. Second, after the alignment of non-attrition areas, the initial homogeneous surface is generated by means of the RBF (Radial Basic Function) implicit surface and then deformed to the final homogeneous by the contraction and bounding algorithm. Finally, the method of bilinear interpolation based on Laplacian coordinates between tooth with attrition and without attrition is used to inversely reconstruct the sequence of changes of the 3D tooth morphology during gradual tooth wear process. This method can also be used to generate a process simulation of nonlinear tooth wear by means of fitting an attrition curve to the statistical data of attrition index in a certain region. The effectiveness and efficiency of the attrition simulation algorithm are verified through experimental simulation.

  4. 3D Simulation Modeling of the Tooth Wear Process.

    Ning Dai

    Full Text Available Severe tooth wear is the most common non-caries dental disease, and it can seriously affect oral health. Studying the tooth wear process is time-consuming and difficult, and technological tools are frequently lacking. This paper presents a novel method of digital simulation modeling that represents a new way to study tooth wear. First, a feature extraction algorithm is used to obtain anatomical feature points of the tooth without attrition. Second, after the alignment of non-attrition areas, the initial homogeneous surface is generated by means of the RBF (Radial Basic Function implicit surface and then deformed to the final homogeneous by the contraction and bounding algorithm. Finally, the method of bilinear interpolation based on Laplacian coordinates between tooth with attrition and without attrition is used to inversely reconstruct the sequence of changes of the 3D tooth morphology during gradual tooth wear process. This method can also be used to generate a process simulation of nonlinear tooth wear by means of fitting an attrition curve to the statistical data of attrition index in a certain region. The effectiveness and efficiency of the attrition simulation algorithm are verified through experimental simulation.

  5. Tooth regeneration: current status.

    Dadu, Shifali S

    2009-01-01

    Regeneration of a functional tooth has the potential to be a promising therapeutic strategy. Experiments have shown that with the use of principles of bioengineering along with adult stem cells, scaffold material, and signaling molecules, tooth regeneration is possible. Research work is in progress on creating a viable bioroot with all its support. A new culture needs to be created that can possibly provide all the nutrients to the stem cells. With the ongoing research, tissue engineering is likely to revolutionize dental health and well-being of people by regenerating teeth over the next decade.

  6. Tooth regeneration: Current status

    Dadu Shifali

    2009-01-01

    Full Text Available Regeneration of a functional tooth has the potential to be a promising therapeutic strategy. Experiments have shown that with the use of principles of bioengineering along with adult stem cells, scaffold material, and signaling molecules, tooth regeneration is possible. Research work is in progress on creating a viable bioroot with all its support. A new culture needs to be created that can possibly provide all the nutrients to the stem cells. With the ongoing research, tissue engineering is likely to revolutionize dental health and well-being of people by regenerating teeth over the next decade.

  7. The clinical efficacy about using cetylpyridinium chloride to prevent infection after impacted tooth extraction%阻生牙拔除后使用西吡氯胺预防感染疗效观察

    马岩; 李新伟

    2016-01-01

    Objective ] To investigate the effect of cetylpyridinium chloride in prevention of infection after impacted teeth ex-traction .[Method] Between January 2014 and December 2015 ,patients with impacted tooth were divided into observation group and control group according to the order of treatment , each group with 100 patients , the observation group were given cetylpyridinium chloride ,one tablet a time ,3 times a day;and control group without medicine ,to compare the incidence of postoperative infection .[Result] The incidence of infection in the observation group was 6% ,and the control group was 22% , which was statistically significant (P<0 .05) .[Conclusion] Using cetylpyridinium chloride after impacted teeth extraction can effectively reduce the incidence of postoperative infection .%目的:探讨西吡氯胺在阻生牙拔除后预防感染中的作用。方法:2014年1月至2015年12月就诊的200例阻生牙拔除患者按照治疗先后顺序分为对照组和观察组,每组100人,观察组术后给予西吡氯胺,一次一片,每日含服3次;对照组术后不用药,一周后比较术后感染发生率。结果:观察组感染发生率6.0%,明显低于对照组(22.0%),差异有统计学意义( P<0.05)。结论:阻生牙拔除后使用西吡氯胺可有效降低术后感染的发生率。

  8. 保存上前牙拔牙窝水平骨量的临床新技术%A novel technique to preserve the alveolar ridge width following tooth extraction in the maxillary frontal area

    蒋析; 林野; 张宇; 邸萍; 陈波; 胡秀莲; 罗佳; 任抒欣; 欧阳思远

    2016-01-01

    Objective:To introduce a novel ridge preservation technique with micro-titanium plate avoiding the use of bone grafting materials,and evaluate the potential horizontal bone preservation effect of this new technique,applied on single maxillary central incisors after tooth extraction for future implant restoration.Methods:Nine patients (six women and three men),mean age (26.0 ±5.7)years(from 1 8 to 34 years)referred to the Department of Oral Implantology,Peking University School and Hospital of Stomotology,were selected and diagnosed with unsalvageable single middle incisor with fine general con-ditions,no signs of acute local inflammation,no ongoing or previous periodontitis,healthy neighboring teeth and intact buccal bone walls.Tooth extraction,delayed implant placement and implant-supported single crown restoration were selected as treatment plan.The teeth were extracted atraumatically with lo-cal anesthesia,followed by a reflection of a minor flap to exposed 2-3 mm of the buccal bone plate.Af-ter that,a micro-titanium plate was trimmed and bended to fit the convexity of the labial bone and fixed by two mini pins with intent to support the labial soft tissue.The flap was then repositioned over the micro titanium plate and secured with two single sutures.No bone grafting materials or releasing incisions were needed.The sockets were left to heal without any intention of primary wound closure.Cone-beam compu-ted tomographic (CBCT)scans were obtained before and four months after tooth extraction.Horizontal ridge widths were measured with CBCT software,and the preservation effects were calculated and recor-ded by the percentage of horizontal ridge alteration.Results:The nine extraction sockets were healed un-eventfully.The average socket width before extraction was (7.51 ±0.48)mm (6.92-7.82 mm).The average alveolar ridge labial-palatal width at the control point of the edentulous area was (6.81 ±0.44) mm (6.04-7.38 mm)4 months after tooth extraction,the mean

  9. Ridge preservation with acellular dermal matrix and anorganic bone matrix cell-binding peptide P-15 after tooth extraction in humans. A histologic and morphometric study

    Arthur B. Novaes Jr

    2012-06-01

    Full Text Available Aim: The aim of this study was to analyze by histomorphometric parameters the use of acellular dermal matrix (ADM with or without anorganic bovine bone matrix (ABM / synthetic cell-binding peptide P-15 in the formation of bone in human alveoli. Materials and methods: Eighteen patients in need of extraction of maxillary anterior teeth were selected and randomly assigned to the test group (ADM plus ABM/P-15 or the control group (ADM only. Histomorphometric measurements and histological analysis were recorded about 6 months after ridge preservation procedures in ten patients. The amount of newly formed bone, the most recently formed bone, fibrous tissue plus marrow spaces and remaining graft particles were measured and analyzed. Results: At 6 months, the new bone area parameter and the percentage of fibrous tissue plus marrow space areas showed higher values to the control group, and statistically significant differences when compared with the test group (p=0.03. Conclusion: The ADM acted as a membrane. The association of ABM/P-15 with ADM resulted in new bone formation within the alveoli, but the results were not considered relevant when used in this indication.

  10. A windowing and mapping strategy for gear tooth fault detection of a planetary gearbox

    Liang, Xihui; Zuo, Ming J.; Liu, Libin

    2016-12-01

    When there is a single cracked tooth in a planet gear, the cracked tooth is enmeshed for very short time duration in comparison to the total time of a full revolution of the planet gear. The fault symptom generated by the single cracked tooth may be very weak. This study aims to develop a windowing and mapping strategy to interpret the vibration signal of a planetary gear at the tooth level. The fault symptoms generated by a single cracked tooth of the planet gear of interest can be extracted. The health condition of the planet gear can be assessed by comparing the differences among the signals of all teeth of the planet gear. The proposed windowing and mapping strategy is tested with both simulated vibration signals and experimental vibration signals. The tooth signals can be successfully decomposed and a single tooth fault on a planet gear can be effectively detected.

  11. 长期服用抗凝药物患者拔牙围手术期的处理%Perioperative management of patients long-time using of anticoagulant in tooth extraction

    曹昊天; 吴也可

    2012-01-01

    对长期服用抗凝药物患者的拔牙操作,一直都被口腔颌面外科门诊医生视为禁忌.随着医疗保健水平提高和老龄化趋势,口腔颌面外科门诊出现了越来越多长期服用抗凝药物的患者.然而在如何对该类患者进行处理的问题上,人们有着不同的看法.本文以近几年相关研究为基础,从术前风险评估、术前准备、术中和术后风险及处理三方面入手,简要阐述对长期服用抗凝药物患者进行拔牙围手术期的注意事项.%The tooth extraction of patient who is long-time using of anticoagulant drug is regard as taboo by oral and maxillofacial surgeon. With the increasing level of health care and aging trends, oral and maxillofacial surgery clinics appear more and more such patients. However, people have different opinions on how to deal with such patients. Based on the related researches in recent years. This review strived for giving a comphrensive angle for this kind of patients from preoperative risk assessment, preoperative preparation, preoperative and postoperative risk.

  12. 活动翼矫治技术关闭拔牙间隙的临床研究%Clinical study on technical activities wing correction closing tooth extraction gap of

    吴惠平

    2015-01-01

    Objective To study the clinical effect of the treatment of the closed tooth extraction with the active wing. Methods A total of 2013 during January to December 2013 in our hospital accepted treatment of 60 cases of canine orthodontic patients as the research object,randomly divided into treatment group and control group,two groups with 30 cases in each patient.Treatment group were used active wing appliance treatment,the control group were treated with edgewise appliance,the variation in the canine root length of two groups of patients,canine alveolar bone height changes,the gap closed speed,patient satisfaction,and other indicators were compared.Observation and comparison of two groups of patients with specific treatment effect,including treatment time, effective time, there is no recurrence,etc. Results in closing the gap rate,treatment group were(0.95±0.03) months,control group (0.80 ± 0.03)months,the two groups of patients with significant difference compared,with statistical significance(P0.05) compared to the;in patient satisfaction,the satisfaction rate of patients of the treatment group was 93.33,the control group of patients satisfaction was 73.33%,two groups in patient satisfaction compared with significant difference, with statistical significance(P0.05);在患者满意度上,治疗组患者满意度为93.33%,对照组患者满意度为73.33%,差异有统计学意义(P<0.05).结论:活动翼矫治技术能更加快速地关闭拔牙间隙,而且比较安全,疼痛感也较少,值得临床推广应用.

  13. Saw-tooth cardiomyopathy

    Karatza Ageliki A

    2009-12-01

    Full Text Available Abstract We present an unusual case of cardiomyopathy in a two month old male infant with a grade-I systolic murmur. Echocardiographic examination disclosed left ventricular (LV, dysplasia with saw-tooth like inwards myocardial projections extending from the lateral walls towards the LV cavity. There was mild LV systolic dysfunction with apical hypokinesia. Cardiovascular magnetic resonance demonstrated in detail these cross bridging muscular projections originating from the inferior interventricular septum and lateral LV wall, along with areas of hypokinesis at the LV septum and apex in a noncoronary distribution, without any late gadolinium enhancement. We have termed this condition saw-tooth cardiomyopathy because of the very characteristic appearance.

  14. 牙仙女%The Tooth Fairy

    李世荣

    2009-01-01

    @@ The American children’s ritual of hiding a lost tooth under a pillow stems from an old German tradition of placing a lost tooth in a mouse or rat hole SO that when a new tooth grew in,it would possess the strong dental qualities of a rodent’S tooth.In America the “tooth rat”was replaced by the“tooth fairy”,who would compensate the child with money for surrendering a tooth to her.

  15. Solving tooth sensitivity.

    Miller, Michael B

    2010-01-01

    Solving tooth sensitivity requires both you and the patients to be resilient and to understand that if one approach doesn't work, you can try another one that is non-invasive or, at worst, minimally invasive. Much like the clinician who posted the original question, I strongly believe that it is our responsibility to convince patients that jumping to a radical solution could be totally unnecessary--and expensive-- and still might not solve the problem.

  16. Decoronation for the management of an ankylosed young permanent tooth.

    Sapir, Shabtai; Shapira, Joseph

    2008-02-01

    Replacement resorption rate is a variable process, and is dependent on age, basal metabolic rate, extra-alveolar time, treatment prior to replantation, amount of root dentin, severity of trauma, and extent of periodontal ligament necrosis. In patients 7-16 years old a tooth is lost 3-7 years after the onset of root resorption. The complications that may develop as a consequence of ankylosis of a permanent incisor in children are due to the inevitable early loss of the traumatized tooth and local arrest of alveolar bone development. An ankylosed tooth should be removed before the changes become so pronounced that they compromise future prosthetic treatment. The treatment options may involve: interceptive regenerative treatment, early extraction of the ankylosed tooth, orthodontic space closure, intentional replantation, extraction of the ankylosed tooth followed with immediate ridge augmentation/preservation, auto-transplantation, single tooth dento-osseous osteotomy, and decoronation. The purpose of this article was to review the considerations involved in the decision-making concerning the use of the decoronation technique for the treatment of a permanent incisor diagnosed as ankylosed.

  17. Music Intervention Effectively Relieve Pain in Patients of Impacted Wisdom Tooth Extraction%音乐干预有效缓解拔除阻生智齿患者的疼痛

    李全平; 李文超

    2014-01-01

    目的:探讨音乐干预对拔除阻生智齿患者疼痛的影响。方法拔除阻生智齿患者80例,随机分为2组,对照组40例,采用常规手术治疗,实验组40例,在常规手术治疗的基础上应用音乐干预,手术前后2组患者均采用疼痛视觉类比量表(PVAS)测查。结果干预组手术前后比较, PVAS平均得分降低,差异有统计学意义(P<0.01),而对照组患者疼痛得分无明显统计学差异(P>0.05),手术后干预组与非干预组PVAS平均得分有统计学差异(P<0.01)。结论音乐干预可有效地缓解拔除阻生智齿患者的疼痛程度。%Objective To discuss the influence of music intervention in patients of impacted wisdom tooth extraction with pain. Methods 80 patients of impacted wisdom tooth extraction were randomly divided into the intervention group and the non-intervention group. The non-intervention group(40 cases)adopted the routine therapy,and the intervention group(40 cases)received the music intervention plus the routine therapy. Pain visual analogue scale(PVAS) was carried out to evaluate the intervention effect. Results After music intervention, the average scores of PVAS was statistically signiifcant differences before and after surgery in patients (P0.05). Conclusions Music intervention can relieve pain in patients of impacted wisdom tooth extraction.

  18. USE THE REIMPLANTED TOOTH AS ABUTMENT FOR FIXED PAR TIAL DENTURE

    Golmoradizadeh

    2013-01-01

    ABSTRACT: OBJECTIVE: Use of the fixed partial denture is more favorable t han the removable partial denture for my patient, she complained about e dentulism in upper right side and a little discomfort with second upper premolar. Clinical examin ation shows the tooth was crown less and radio graphically tooth had a big periapical lesi on with poor prognosis. METHOD: After root canal treatment and extraction the tooth, clea n and irrigate the socket, we are i...

  19. Clinical study on the alveolar bone defect after tooth extraction in the patients with diabetic%糖尿病缺牙患者种植区骨缺损情况研究

    张思佳; 刘向伟; 周宇超; 宋应亮; 王舒妍; 魏洪波; 方开秀; 许晓茹; 王立峰; 任帅; 谭乃文

    2015-01-01

    AIM:To compare the recovery of the alveolar bone at the tooth extraction site between the diabe-tes patients and non-diabetic patients. METHODS:37 patients with type 2 diabetes and 37 age, residence, general health, subsequent visit time, teeth extraction, GBR ( Guided Bone Regeneration) treatment matched patients without diabetes were included. All the patients did not smoke or quit smoking after the first visit. 6 months after surgery the sockets ridge width and height were measured on CT images. The data were compared between groups. RESULTS:The bone defect at the extraction site of diabetic group was larger, the rate of GBR surgery and the mass of bone graft were more than those of the non-diabetic group (P<0. 05). CONCLUSION: Diabetic patients has poor alveolar bone recovery than non-diabetic patients after teeth extraction;they tend to accept GBR surgery.%目的::评价糖尿病缺牙患者骨缺损程度与非糖尿病患者的区别。方法:选取已经确诊的、血糖得到良好控制的2型糖尿病和血糖正常的缺牙患者各37例,2组患者缺失牙位、年龄、性别、拔牙后复诊时间、拔牙原因、长期居住地、吸烟、全身健康状况、颌骨情况一致或相近;记录配对的37组患者拔牙位点牙槽嵴高度与宽度,拔牙窝内骨面最低点与理想骨平面高度差,植骨术相关信息。并进行统计学分析,评价糖尿病缺牙患者骨缺损程度与非糖尿病患者的区别。结果:拔牙后3~24个月,糖尿病组拔牙位点处骨缺损程度较非糖尿病组严重,植骨率和植骨量均高于非糖尿病组(P<0.05)。结论:糖尿病缺牙患者拔牙位点处骨缺损程度较非糖尿病患者严重,在自然愈合情况下更倾向于进行植骨手术。

  20. Effects of extraction of impacted mandibular third molar followed by periodontal treatment of adjacent tooth%下颌阻生第三磨牙拔除后邻牙牙周治疗的临床疗效

    李曼煜; 张梦葩; 陈文文; 黄蓉

    2013-01-01

    AIM:To evaluate th effects of extraction of impacted mandibular third molar followed by periodontal treatment of adjacent tooth.METHODS:Bilateral 106 native forward or horizontaly impacted mandibular third molars in 53 patients were included.53 teeth on one side were extracted by conventional surgery as the controls,53 teeth on the other side were extracted by conventional surgery followed by periodontal treatment of adjacent second molars as the experimental group,including root scaling,planing and wedge-shaped teeth week operation.One year follow-up was conducted,plaque index(PLI),bleeding index (BI),periodontal probing depth (PD),probing sensitivity (DH) and alveolar bone changes of the second molar were measured,data were statisticaly analysed.RESULTS:One year after treatment PLI,BI,PD and DH in experimental group were 0.82 ± 0.57,0.90 ± 0.82,(1.37 ± 0.31) mm and 5.66%,those in the control group were 1.65 ± 0.60,1.21 ± 0.71,(1.93 ± 0.45)mm and 39.62%,respectively (P < 0.05).Alveolar bone increase was observed in 39.47% of the experimental cases and 3.77% of the controls (P < 0.05).CONCLUSION:Periodontal treatment with wedge valve operation may reduce the postoperative complications of the adjacent mandibular second molars after extraction of the impacted third molars.%目的:观察下颌阻生第三磨牙拔除后邻牙远中面不同牙周处理方法的疗效.方法:采用自身双侧对照法,选择双侧下颌第三磨牙前倾或水平阻生的患者53名106个牙,一侧(对照组)53个阻生齿拔除后常规骚刮拔牙窝,简单根面平整,间断缝合,压迫止血;对侧(实验组)阻生齿(53个)拔除后第二磨牙远中面做龈下基础刮治和根面平整术及楔形牙周手术,锚式缝合,压迫止血.术后跟踪观察1年,检查记录第二磨牙远中面菌斑指数(PLI),出血指数(BI),探诊敏感(DH),牙周探诊深度(PD),牙槽骨的变化等并进行统计学分析.结果:术后1年,PLI、BI,PD、DH等各

  1. 咪达唑仑静注在儿童埋伏多生牙拔除术中的应用%The evaluation of clinical effects of intravenous injection midazolam sedation in supernumerary tooth extraction of children

    王云霞; 李镭

    2013-01-01

    目的 探讨在日间门诊手术室咪达唑仑静脉镇静状态下拔除儿童上颌埋伏多生牙的临床效果.方法 选择在郑州人民医院口腔科门诊就诊拔除上颌埋伏多生牙的7~14岁患儿13名,美国麻醉医师协会分级Ⅰ级,咪达唑仑静注到中度镇静,在局麻下进行拔牙手术,监测患儿生命体征.结果 患儿的生命体征平稳,年龄和体重、用药总量的关系呈正相关,差异有统计学意义(P<0.05);年龄与用药剂量之间呈负相关,差异有统计学意义(P<0.05).年龄对局部麻醉注射、及手术过程的记忆有影响,差异无统计学意义(P>0.05).所有病例手术顺利并安全离院,离院标准评分均在12分以上,术后回访显示大部分患儿出现不同程度的顺行性遗忘.结论 在日间门诊手术室采用咪达唑仑静脉镇静配合口腔局部注射麻醉拔除儿童上颌埋伏多生牙是安全有效的方法.%Objective To investigate the clinical effect in the daytime out-patient operation room midazolam intravenous sedation extracted maxillary impacted supernumerary teeth in children.Methods 13 patients age range of 7~14 with maxillary impacted supernumerary teeth were selected to be carried tooth extraction operation under local anesthesia,midazolam intravenous injection to moderate sedation,graded Ⅰ by American Society of Anesthesiology (ASA),Vital signs of patients were monitored.Results The vital signs of patients were stable,the age and weight were the positive correlated with cumulate dosage,P value of <0.05 were considered statistically significant; the age were negatively correlated with doses,P value of <0.05 were considered statistically significant.The age have the effect on local anesthetic injection and the memory for operation incision,P value of >0.05 were not considered statistically significant.All cases were operation smoothly and safely discharged,and all the standard score of discharged were more than 12 points

  2. Effectiveness analysis of levobupivacaine applied in anesthesia for lower mandible impacted tooth ;extraction%左旋布比卡因应用于下颌阻生智齿拔除术中麻醉的有效性分析

    江剑彬

    2015-01-01

    Objective To observe and investigate the clinical effect of levobupivacaine applied in anesthesia for lower mandible impacted tooth extraction, and to summarize its clinical significance. Methods A total of 72 patients receiving lower mandible impacted tooth extraction were randomly divided into observation group and control group, with 36 cases in each group. The observation group received levobupivacaine for anesthesia, and the control group was given lidocaine hydrochloride for anesthesia.Clinical effects of anesthetics in lower mandible impacted tooth extraction of the two groups were observed and compared. Results The observation group had better analgesic effect than the control group, and the difference had statistical significance (P<0.05). Conclusion Application of levobupivacaine in anesthesia for lower mandible impacted tooth extraction provides precise effect with quick onset time, good intraoperative anesthetic effect, and long anesthesia time.%目的:观察探讨左旋布比卡因应用于下颌阻生智齿拔除术中麻醉的临床效果,总结其临床意义。方法72例下颌阻生智齿拔除患者,随机分为观察组和对照组,各36例,其中观察组使用左旋布比卡因进行麻醉,对照组使用盐酸利多卡因麻醉,观察对比两组麻醉药物在下颌阻生智齿拔除术中的临床效果。结果观察组镇痛效果优于对照组,差异具有统计学意义(P<0.05)。结论左旋布比卡因应用于下颌阻生智齿拔除术中麻醉,其效果显著,且麻醉起效快,术中麻醉效果好,麻醉时间长。

  3. 心血管病患者使用阿替卡因肾上腺素心电监护拔牙的临床疗效观察%Evaluation of tooth extraction in patients with cardiovascular disease under local anesthesia

    段向青; 吕亚林; 臧滔; 宫路宁; 刘莹; 左健; 丁芳; 陈方

    2011-01-01

    Objective To evaluate the safety of tooth extraction in the cardiovascular disease patients under local anesthesia with articaine. Methods A total of 1224 patients were included in this study. The changes of systolic (SBP) and diastolic (DBP) blood pressure,heart rate, electrocardiogram (EEG) and subjective feeling were observed before, during and after operation. Results Tooth extraction in all patients was successfully completed. SBP, DBP and heart rate increased significantly during operation ( P < 0. 05 ) and decreased 10 minutes after tooth extraction ( P < 0. 01 ). Conclusion Tooth extraction is safe for properly treated patients with cardiovascular disease under local anesthesia.%目的 探讨应用含微量肾上腺素的阿替卡因局部麻醉药对心血管病患者拔牙的安全性.方法 对1224名心血管病患者应用含微量肾上腺素的局部麻醉药,在心电监护下拔牙,观察并监测手术过程中麻醉前后、拔牙前后的血压、心率变化,进行对比分析.结果 1224名患者均较顺利完成手术;麻醉前、后,麻醉前与拔牙术中,拔牙术中、术后及麻醉前与拔牙术后10min的收缩压变化均有统计学差异;拔牙后10min的收缩压、舒张压及心率较麻醉前显著下降.结论 对经过全身系统治疗、病情稳定的心血管病患者,麻药中加入少量肾上腺素局麻下拔牙是安全有效的.

  4. An automatic tooth preparation technique: A preliminary study

    Yuan, Fusong; Wang, Yong; Zhang, Yaopeng; Sun, Yuchun; Wang, Dangxiao; Lyu, Peijun

    2016-04-01

    The aim of this study is to validate the feasibility and accuracy of a new automatic tooth preparation technique in dental healthcare. An automatic tooth preparation robotic device with three-dimensional motion planning software was developed, which controlled an ultra-short pulse laser (USPL) beam (wavelength 1,064 nm, pulse width 15 ps, output power 30 W, and repeat frequency rate 100 kHz) to complete the tooth preparation process. A total of 15 freshly extracted human intact first molars were collected and fixed into a phantom head, and the target preparation shapes of these molars were designed using customised computer-aided design (CAD) software. The accuracy of tooth preparation was evaluated using the Geomagic Studio and Imageware software, and the preparing time of each tooth was recorded. Compared with the target preparation shape, the average shape error of the 15 prepared molars was 0.05–0.17 mm, the preparation depth error of the occlusal surface was approximately 0.097 mm, and the error of the convergence angle was approximately 1.0°. The average preparation time was 17 minutes. These results validated the accuracy and feasibility of the automatic tooth preparation technique.

  5. Tooth loss inhibits neurogenesis in the dentate gyrus of adult mice

    Shaochen Su; Tao Qi; Baoli Su; Huibin Gu; Jianlin Wang; Lan Yang

    2014-01-01

    Tooth loss has been shown to affect learning and memory in mice and increases the risk of Alz-heimer’s disease. The dentate gyrus is strongly associated with cognitive function. This study hypothesized that tooth loss affects neurons in the dentate gyrus. Adult male mice were random-ly assigned to either the tooth loss group or normal control group. In the tooth loss group, the left maxillary and mandibular molars were extracted. Normal control mice did not receive any intervention. Immunolfuorescence staining revealed that the density and absorbance of double-cortin-and neuronal nuclear antigen-positive cells were lower in the tooth loss group than in the normal control group. These data suggest that tooth loss may inhibit neurogenesis in the dentate gyrus of adult mice.

  6. CANINE ECTOPIC TREATMENT WITH FIRST MOLAR EXTRACTION

    Angelica Margo

    2015-06-01

    Full Text Available Decision to extract or not and the type of tooth must be analyzed carefully in orthodontic treatment. Preferable tooth to be extracted was the tooth with large caries or restoration. Usually the type of tooth to be extracted was second molar (if the third molar appears, incisor, first molar, and combination of several teeth. Orthodontic treatment with molar extraction is more difficult to treat and the result is usually compromise. There are several considerations in extracting first molar such as tooth with large caries or restoration, hypoplasia, periapical disease, large discrepancy, high maxilla-mandibular plane angle, and cases with anterior open bite. Nowadays, orthodontic cases with molar extraction do not prolong the treatment time compared to premolar extraction case, but the anchorage system must be considered carefully. The present case was treated with extraction of first molar to solve anterior crowding with maximum anchorage at the upper jaw and using Nance Holding Appliance.

  7. Partial tooth gear bearings

    Vranish, John M. (Inventor)

    2010-01-01

    A partial gear bearing including an upper half, comprising peak partial teeth, and a lower, or bottom, half, comprising valley partial teeth. The upper half also has an integrated roller section between each of the peak partial teeth with a radius equal to the gear pitch radius of the radially outwardly extending peak partial teeth. Conversely, the lower half has an integrated roller section between each of the valley half teeth with a radius also equal to the gear pitch radius of the peak partial teeth. The valley partial teeth extend radially inwardly from its roller section. The peak and valley partial teeth are exactly out of phase with each other, as are the roller sections of the upper and lower halves. Essentially, the end roller bearing of the typical gear bearing has been integrated into the normal gear tooth pattern.

  8. EXTRACT

    Pafilis, Evangelos; Buttigieg, Pier Luigi; Ferrell, Barbra

    2016-01-01

    The microbial and molecular ecology research communities have made substantial progress on developing standards for annotating samples with environment metadata. However, sample manual annotation is a highly labor intensive process and requires familiarity with the terminologies used. We have the...... and text-mining-assisted curation revealed that EXTRACT speeds up annotation by 15-25% and helps curators to detect terms that would otherwise have been missed.Database URL: https://extract.hcmr.gr/....

  9. Immediate natural tooth pontic: A viable yet temporary prosthetic solution: A patient reported outcome

    Sudhir Bhandari

    2012-01-01

    Conclusion: The concept of immediate pontic placement is surely a viable treatment option and promises an excellent transient esthetic solution for a lost tooth as well as enables good preparation of the extraction site for future prosthetic replacement.

  10. 缝合与不缝合对下颌高位阻生智齿拔牙牙创的影响研究%Study on the Effect of Suturing or Not to High Mandibular Impacted Wisdom Tooth Extraction Wound

    朱樱; 南欣荣

    2014-01-01

    目的:探讨缝合与不缝合对下颌高位阻生智齿拔牙牙创的影响。方法:回顾性分析我院2011年12月至2013年12月收治的90例下颌高位阻生智齿拔牙患者的临床资料。其中试验组45例行创面缝合,对照组45例创面不予缝合。观察两组患者3d内干槽症发生状况、牙创一期愈合情况以及牙创愈合平均时间。结果:试验组于3d内一期愈合率优于对照组(P<0.05),且牙创愈合平均时间短于对照组(P<0.05),干槽症发生率少于对照组(P<0.05)。结论:强化下颌高位阻生智齿拔牙患者牙创缝合,有助于保证结缔组织生长,促进牙创愈合。%Objective:To investigate the suture or not high mandibular impacted wisdom tooth extraction wound. Methods:Retrospectively analyzing 98 cases with high mandibular impacted wisdom tooth extraction in the hospital from December, 2011 to December, 2012. 45 cases was treated with suturing in the experimental group, and 45 cases wasn’t treated with suturing in the control group. The alveolitis, the healing condition of tooth wound and the average healing time were compared in 3d. Results:Healing rate of the experimental group is better than that of the control group (P<0.05), and the average healing time in the experimental group is shorter than that in the control group (P<0.05). The incidence of alveolitis is less than that of the control group (P<0.05). Conclusion:Strengthening mandibular impacted wisdom tooth extraction in patients with high wound suture, helps to ensure the connective tissue growth, and promote periodontal wound healing.

  11. Straight wire bow and correcting device the rapy in patients with tooth extraction not hard tissuec hanges observed before and after treatments%直丝弓矫治器治疗拔牙患者矫治前后硬组织的变化观察

    刘健; 程曦

    2016-01-01

    目的:探讨直丝弓矫正器在治疗拔牙患者的前后硬组织中的效果。方法:借助头颅侧片对治疗前后的头影进行测量,同时比对应组织的变化。结果:上下颌骨矢状向,垂直向生长以及前牙位置无明显变化,此外通过对 L1-MP,L1-NA(mm)治疗前后的比较下前牙位置发生了明显改变,但仍旧在正常范围内。结论:通过直丝弓矫正方式对拔牙患者在治疗中可以获得较为理想的效果。%Objective:to explore the straight wire bow orthotics in treatment of patients with tooth extraction of hard tissue before and after the effect.methods With the head side of head shadow measurement before and after the treatment,at the same time than the corresponding change of the organization.Results:sagittal to upper and lower jaws,disposal of growth as well as the front teeth position has no obvious change,moreover L1-MP,L1-NA (mm)before and after treatment comparison of anterior tooth position has certainly changed,but still within the normal range.Conclu-sion:through the straight wire bow in the correct way is not in the treatment of patients with tooth extraction can obtain ideal effect.

  12. Curative effect and nursing points of different kinds of gargle oral infection prevention after tooth extraction%分析不同种类的漱口液预防拔牙后口腔感染的疗效及护理要点

    张玲玲; 林佳

    2015-01-01

    ObjectiveStudy on effect of different types of oral infection prevention after tooth extraction solution, provides the reference for the clinical nursing.methodsIn 2013 Juneto2014 year in October the oral infection with different preventive gargle in the treatment of 150 cases of patients treated in our hospital department of Stomatology after receiving tooth extraction, the patients were randomly divided into 3 groups, each 50 cases, were treated with a povidone iodine solution,hydrogen peroxide solution and physiological saline 3 a gargle, observed after oral infection rate of.Results150 cases of patients with oral cavity after tooth extraction treatment of Department of Stomatology infection13 cases, postoperative infection rate was 8.67%; and the 3 kinds of oral infection prevention mouthwashafter tooth extraction effect is not the same, containing mouthwash povidone iodine liquid used in postoperative patients with oral cavity infection rate was 0, the difference was statistically signiifcant (P<0.05).ConclusionThe best effect with povidone iodine liquid after extraction with prevention of oral infection, can effectively inhibit oral bacteria infection in patients after hospital treatment, patients in the Department of Stomatologyafter tooth extraction, should be reasonable to choose the recovery effect of mouthwash, so as to improve thepostoperative patients.%目的:研究不同种类的漱口液预防拔牙后口腔感染的疗效,为临床护理提供参考。方法选择2013年6月~2014年10月在我院接受口腔科拔牙治疗的150例患者,术后采用不同种类的漱口液预防术后口腔感染,将患者随机分为甲乙丙三组,各50例,患者分别采用聚维酮碘漱口液、过氧化氢漱口液和生理盐水漱口液,观察术后口腔感染发生率。结果150例口腔科拔牙治疗患者,拔牙后出现口腔感染13例,感染率为8.67%;且三种漱口液防拔牙后口腔感染的疗效是不相同的,含

  13. Resection of the Tooth Apex with Diode Laser

    Uzunov Tz.

    2014-06-01

    Full Text Available An “in vitro” experimental study has been carried out on 70 extracted teeth. A laser resection of the root apex has been carried out with diode laser beam with a wavelength of - 810 ± 10 nm. Sequentially a radiation with increasing power has been applied, as follows: 1,3 W, 2W, 3W, 4W, 5W, 6W, 7W, in electro surgery mode. Successful resection of the tooth apex has been performed at: 3W; 4W; 5W; 6W and 7W power. It was established that when laser resected the tooth apex carbonizes.

  14. Clinical evaluation of cardiovascular influence of tooth extraction in patients after coronary artery bypass graft operation under electrocardiographic monitoring%174例冠状动脉旁路移植术后患者心电监护下拔牙的临床观察

    项天庆; 段向青; 宣玮; 余兰; 吕亚林

    2015-01-01

    Objective:To evaluate the safety of tooth extraction in patients after coronary artery bypass graft (CABG) operation under local anesthesia with 4% articaine hydrochloride with 1∶100000 epinephrine.Methods:A total of 174 patients requiring tooth extraction under local infiltration anesthesia or nerve block anesthesia with 1-3 capsules of articaine were enrolled in this study. The following hemodynamic parameters were observed during the operation at 5 different moments: systolic blood pressure(SBP), diastolic blood pressure(DBP), heart rate(HR), the electrocardiogram changes, rate pressure product(RPP), pressure rate quotient(RPQ) and the symptoms were also involved in estimation.Results:160 patients completed the operation and 14 patients were dropped due to elevated blood pressure, arrhythmia, chest pain, et al. SBP was increased significantly during injection of anesthetic solution (P=0.038) and tooth extraction (P=0.012); RPP was also ascended significantly during tooth extraction(P=0.025). No statistical changes were observed with DBP, HR and RPQ at any different moments.Conclusion:Most patients after CABG could finish tooth extraction under electrocardiographic monitoring; the procedure was safe by means of careful preparation and gentle performance.%目的:评估拔牙手术对冠状动脉旁路移植(CABG)术后患者心血管系统的影响。方法:174例冠状动脉旁路移植术后患者复方阿替卡因注射液(必兰)局部麻醉,心电监护下拔除患牙,记录静息状态下(T0)、麻药注射过程中(T1)、麻药注射后5min(T2)、拔牙术中(T3)及拔牙术后5min(T4)收缩压、舒张压、心率等血流动力学参数、心电图变化和患者症状体征,计算心率-收缩压乘积(RPP)和平均动脉压心率商(PRQ)。结果:160例患者完成拔牙手术,14例患者因收缩压持续升高、频发室性早搏、心绞痛等原因终止拔牙手术。结论:大多数基础病变控制良好的CABG术后患者可

  15. Atypical Odontalgia (Phantom Tooth Pain)

    ... atypical facial pain, phantom tooth pain, or neuropathic orofacial pain, is characterized by chronic pain in a ... such as a specialist in oral medicine or orofacial pain. The information contained in this monograph is ...

  16. Biomaterial Selection for Tooth Regeneration

    2011-01-01

    Biomaterials are native or synthetic polymers that act as carriers for drug delivery or scaffolds for tissue regeneration. When implanted in vivo, biomaterials should be nontoxic and exert intended functions. For tooth regeneration, biomaterials have primarily served as a scaffold for (1) transplanted stem cells and/or (2) recruitment of endogenous stem cells. This article critically synthesizes our knowledge of biomaterial use in tooth regeneration, including the selection of native and/or s...

  17. The impact of restorative treatment on tooth loss prevention

    Caldas Junior Arnaldo de França

    2003-01-01

    Full Text Available A cross-sectional study was carried out to analyze tooth loss resulting from caries in relation to the number of times the extracted tooth had been restored, the type of caries diagnosed (primary or secondary, and socioeconomic indicators of patients from the city of Recife, Brazil. Ten public health centres and ten centres associated with health insurance companies were randomly selected. The size of the sample was calculated using a standard error of 2.5%. A confidence interval of 95% and a 50% prevalence of reasons for extractions were used for calculating the sample. The minimum size of the sample for meeting these requirements was 381 patients. Patients were randomly selected from the list of adults registered at each centre. A total of 410 patients were invited to take part in the study. The response rate was 100%, but 6 patients were excluded due to incompleteness of data in the questionnaire applied. An assessment was made to obtain the number of decayed, missing or filled teeth (DMFT index and the reasons for extraction. The results showed a highly significant (p < 0.001 relationship between the number of times the tooth indicated for extraction had been restored and the reason for extraction being caries. Furthermore, the majority of teeth extracted due to caries had been restored two or more times. A highly statistically significant association was also observed between one indicator of use of dental services (F/DMFT and extraction due to caries (p < 0.001. The findings questioned the belief that tooth loss can be prevented in the general population by merely providing restorative treatment.

  18. Treatment of a horizontal root-fractured tooth with decoronation procedure: case report

    Selen Esin Yoldaş

    2016-05-01

    Full Text Available INTRODUCTION: Early loss of permanent anterior teeth due to trauma can cause esthetic and functional problems for young patients. In such cases, replacement of the missing tooth with traditional approaches is possible; however such approaches will reduce the chance of the patient to receive an esthetic and consistent treatment in the future. CASE REPORT: A 12-year-old male patient referred to our clinic with a history of trauma. Complicated crown fracture in tooth no.11 and horizontal root fracture in tooth no. 21 was detected. Following root canal treatment, tooth no. 11 was restored with a fiber post and a strip crown. To avoid alveolar bone loss due to early tooth extraction, decoronation procedure, an alternative approach, was applied to tooth no. 21. This procedure consisted of leaving the root fragment inside the alveolar socket following the removal of the crown. For the rehabilitation of the missing crown, a partial removable prosthesis was implemented. The patient was recalled in 6., 12. and 18. months. Within the follow-up period, no reduction in the alveolar bone level was seen. No sign of infection was evident. The remaining root fragment kept on resorbing. Tooth no. 11 remained symptom-free as well. The patient is still being followed. CONCLUSION: Decoronation is essentially a treatment choice for preventing alveolar bone loss in ankylosed teeth considered for extraction. In this case report, decoronation was shown to be a suitable alternative also for a fractured, non-ankylosed tooth.

  19. Multidisciplinary Treatment Options of Tooth Avulsion Considering Different Therapy Concepts

    Kostka, Eckehard; Meissner, Simon; Finke, Christian H; Mandirola, Manlio; Preissner, Saskia

    2014-01-01

    Background: Avulsion of permanent front teeth is a rare accident, mostly affecting children between seven and nine years of age. Replanted and splinted, these teeth often develop inflammation, severe resorption or ankylosis affecting alveolar bone development and have to be extracted sooner or later. Objectives: The purpose of this study was to evaluate different therapy concepts to create a structured concept for the treatment of avulsions. Results: Based on existing therapy concepts, a concept for different initial conditions (dry time, age, growth, tooth, hard and soft tissues) was developed and is presented here. Conclusion: A great deal of research has been performed during recent years and guidelines for the management of avulsions have been published. With the help of this literature it is possible to identify the best treatment procedure for each tooth. Clinical Relevance: The prognosis of avulsed teeth can be improved by considering evidence-based therapy concepts. Resorption, ankylosis and tooth loss could be minimized. PMID:25352922

  20. Histological changes following surgically-assisted rapid tooth movement through resistance reduction and distraction osteogenesis in dogs

    2010-01-01

    Objective To investigate the histological changes of rapid tooth movement in dogs treated by resistance reduction and distraction osteogenesis,aiming to establish an animal model and further to reveal the remodeling mechanism of rapid tooth movement. Methods A total of 8 local hybrid dogs were selected as subjects for this study. The second pre-molar was extracted on both sides. The experimental side underwent alvelor surgery for resistance reduction and a home-made tooth-borne intraoral distraction device ...

  1. Clinical application of site preservation in posterior area in order to prevent alveolar bone resorption after tooth extraction%应用位点保存技术预防拔牙后牙槽骨吸收的临床疗效观察

    李景辉; 杨瑛; 张方明

    2016-01-01

    目的:观察和评价应用位点保存技术预防拔牙后牙槽骨吸收的临床疗效。方法选取需要拔除下颌磨牙的患者40例,随机分为两组。实验组20例患者拔牙后即刻在拔牙窝内植入 Bio - Oss骨粉,创口表面覆盖 Bio -Gide胶原膜,对照组20例患者拔牙后进行常规处理。定期复查观察两组患者拔牙窝愈合情况,于拔牙后即刻与拔牙后6个月拍摄锥形束 CT(CBCT),观察和测量牙槽骨垂直向吸收量、牙槽骨高度与宽度、骨密度和新骨轮廓的变化,评价位点保存的临床效果。结果拔牙后6个月实验组牙槽骨垂直向吸收量明显小于对照组;实验组骨密度、新骨轮廓明显优于对照组,两组之间具有统计学差异( P <0.05)。CBCT 测量统计学分析后证实两组间牙槽骨高度与宽度的变化具有显著性差异( P <0.05)。结论位点保存技术可以有效减少因拔牙而造成的牙槽骨吸收,很好地维持拔牙位点的骨量,从而为后期的种植牙修复提供良好的位点条件,值得临床推广。%Objective To observe the clinical effect of site preservation in posterior area in order to prevent alveolar bone resorption after tooth extraction. Methods Forty patients with posterior sick teeth were selected for this study,and they were randomly divided into two groups, 20 patients in trial group were implanted with Bio - Oss in the alveolar socket immediately after tooth extraction,the wound surface covered by Bio- Gide collagen membrane,and the tooth extraction in 20 patients of control group had been performed by conventional treatment. The results of patients in these two groups were observed The changes in alveolar bone density,height,width and new bone contour were observed by CBCTscan-ning in patients of these 2 groups after 6 months. Results In comparison with these two groups,new bone contour and bone density in patients of trial group were significantly

  2. Effect of Orthodontic Tooth Movement on Salivary Aspartate Aminotransferase Activity

    Steiven Adhitya

    2013-07-01

    Full Text Available 72 1024x768 Aspartate aminotransferase is one of biological indicator in gingival crevicular fluid (CGF. Force orthodontic application could increase activity of aspartate aminotransferase in CGF. However, the increase activity of aspartate aminotransferase in saliva due to orthodontic force and its correlation between aspartate aminotransferase activity and tooth movement remains unclear. Objectives: To evaluate application orthodontic force on the aspartate aminotransferase activity in saliva based on the duration of force and finding correlation between tooth movement and aspartate aminotransferase activity. Methods: Twenty saliva samples collected before extraction of first premolar, at the time of force application for canine retraction and after force application. The canines retraction used 100 grams of interrupted force (module chain for thirty days. The collection of saliva and the measurement of tooth movement were carried out 1 day, 7 days, 14 days, 21 days, and 28 days after force application. The measurement of aspartate aminotransferase activity in saliva was done using spectrophotometer. Results: Application of orthodontic force influences the salivary aspartate aminotransferase activity (F=25.290, p=0.000. Furthermore, tooth movement correlated with aspartate aminotransferase activity (F=0.429, p=0.000. Conclusion: Aspartate aminotransferase activity could be used as tooth movement indicator that related to the duration of force application.DOI : 10.14693/jdi.v20i1.128

  3. Tooth wear patterns in the deciduous dentition.

    Warren, John J; Yonezu, Takuro; Bishara, Samir E

    2002-12-01

    Tooth wear is common in the deciduous dentition. A recent study suggests that tooth wear in the deciduous dentition is related to subsequent tooth wear in adults, so that early identification of factors related to tooth wear could be of long-term benefit. The purposes of this study were to describe patterns of tooth wear in the deciduous dentition and to relate tooth wear to occlusal characteristics and longitudinal dietary patterns. Data were collected as part of a longitudinal study of a cohort of children recruited at birth from Iowa hospitals. Stone casts were obtained in the deciduous dentition stage, and 355 children, 4 to 5 years old, met the selection criteria. Tooth wear was categorized for each tooth as none, mild, moderate, or severe, and related to occlusal characteristics and longitudinal data on fruit juice and soft drink consumption. All children exhibited some tooth wear on at least 1 tooth, and nearly 16% of them had at least 1 tooth with severe wear. Tooth wear was generally more severe in the maxillary arch and the anterior teeth. Severe tooth wear on the molars was significantly related to posterior crossbites, but severe tooth wear on the incisors was related to Class III canine relationships. There were no statistically significant relationships between tooth wear and soft drink or fruit juice consumption. Based on our results, we concluded that mild tooth wear is universal in the deciduous dentition, but only a few occlusal factors are related to severe tooth wear. Tooth wear was not related to any dietary patterns we investigated.

  4. Effect of platelet rich plasma on distal periodontal healing of lower second molar after impacted wisdom tooth extraction%富血小板血浆对阻生智齿拔除后邻牙远中牙周愈合的影响

    姜志清; 王兴强; 赵秀; 孙美娜

    2015-01-01

    AIM:To investigate the clinical effects of platlet rich plasma ( PRP) used in the socket on the distal probing depth( PD) and periodontal attachment loss( AL) of lower second molar after C1 impacted wisdom tooth extraction. METHODS:40 patients with C1 impacted wisdom teeth were divided into 2 groups(n=20). The distal PD and AL of lower second molars were no less than 7. 5 mm and 6 mm respecively before tooth extraction. In experi-ment group PRP was put in the sockets after tooth extraction. In control group the sockets were not treated. Before and 6 m after operation PD and AL were measured, statistical differences were analyzed. RESULTS:Before operation PD and AL in the 2 groups were not statistically defferent(P>0. 05), 6 m after operation PD and AL in experiment group were lower than those in control group(P7.5 mm、AL>6 mm,患者随机分为两组(n=20)。阻生牙拔除后,实验组牙槽窝内置入富血小板血浆;对照组牙槽窝由血凝块充盈。拔牙术后6个月测量第二磨牙远中PD、AL,并比较两组之间差异。结果:术前两组患者PD、PL无显著差异(P>0.05);术后6个月,与对照组相比,实验组牙槽窝内置入富血小板血浆能明显降低第二磨牙远中PD、AL值(P<0.05)。结论:下颌阻生第三磨牙拔除术后牙槽窝置入富血小板血浆有利于第二磨牙远中牙周组织健康。

  5. Tooth polishing: The current status

    Madhuri Alankar Sawai

    2015-01-01

    Full Text Available Healthy teeth and gums make a person feel confident and fit. As people go about their daily routines and with different eating and drinking habits, the tooth enamel turns yellowish or gets stained. Polishing traditionally has been associated with the prophylaxis procedure in most dental practices, which patients know and expect. However, with overzealous use of polishing procedure, there is wearing of the superficial tooth structure. This would lead to more accumulation of local deposits. Also, it takes a long time for the formation of the fluoride-rich layer of the tooth again. Hence, now-a-days, polishing is not advised as a part of routine oral prophylaxis procedure but is done selectively based on the patients′ need. The article here, gives an insight on the different aspects of the polishing process along with the different methods and agents used for the same.

  6. Tooth polishing: The current status.

    Sawai, Madhuri Alankar; Bhardwaj, Ashu; Jafri, Zeba; Sultan, Nishat; Daing, Anika

    2015-01-01

    Healthy teeth and gums make a person feel confident and fit. As people go about their daily routines and with different eating and drinking habits, the tooth enamel turns yellowish or gets stained. Polishing traditionally has been associated with the prophylaxis procedure in most dental practices, which patients know and expect. However, with overzealous use of polishing procedure, there is wearing of the superficial tooth structure. This would lead to more accumulation of local deposits. Also, it takes a long time for the formation of the fluoride-rich layer of the tooth again. Hence, now-a-days, polishing is not advised as a part of routine oral prophylaxis procedure but is done selectively based on the patients' need. The article here, gives an insight on the different aspects of the polishing process along with the different methods and agents used for the same.

  7. On gear tooth stiffness evaluation

    Pedersen, Niels Leergaard; Jørgensen, Martin Felix

    2014-01-01

    The estimation of gear stiffness is important for determining the load distribution between the gear teeth when two sets of teeth are in contact. Two factors have a major influence on the stiffness; firstly the boundary condition through the gear rim size included in the stiffness calculation...... and secondly the size of the contact. In the FE calculation the true gear tooth root profile is applied. The meshing stiffnesses of gears are highly non-linear, it is however found that the stiffness of an individual tooth can be expressed in a linear form assuming that the contact width is constant. © 2014...

  8. Asymmetric extractions in orthodontics

    Camilo Aquino Melgaço; Mônica Tirre de Souza Araújo

    2012-01-01

    INTRODUCTION: Extraction decisions are extremely important in during treatment planning. In addition to the extraction decision orthodontists have to choose what tooth should be extracted for the best solution of the problem and the esthetic/functional benefit of the patient. OBJECTIVE: This article aims at reviewing the literature relating the advantages, disadvantages and clinical implications of asymmetric extractions to orthodontics. METHODS: Keywords were selected in English and Portugue...

  9. Evolution and developmental diversity of tooth regeneration.

    Tucker, Abigail S; Fraser, Gareth J

    2014-01-01

    This review considers the diversity observed during both the development and evolution of tooth replacement throughout the vertebrates in a phylogenetic framework from basal extant chondrichthyan fish and more derived teleost fish to mammals. We illustrate the conservation of the tooth regeneration process among vertebrate clades, where tooth regeneration refers to multiple tooth successors formed de novo for each tooth position in the jaws from a common set of retained dental progenitor cells. We discuss the conserved genetic mechanisms that might be modified to promote morphological diversity in replacement dentitions. We review current research and recent progress in this field during the last decade that have promoted our understanding of tooth diversity in an evolutionary developmental context, and show how tooth replacement and dental regeneration have impacted the evolution of the tooth-jaw module in vertebrates.

  10. Orthodontic Tooth Movement: A Historic Prospective.

    Will, Leslie A

    2016-01-01

    The earliest report on orthodontic tooth movement in the English literature was published in 1911. Oppenheim carried out studies on baboons to determine what histologic changes occurred during tooth movement. Reitan and many others carried out research into the nature of tooth movement. The pressure-tension model of tooth movement developed from these studies, whereby the two sides of the tooth responded to forces as if in isolation. A second theory, proposed by Stuteville in 1938, was the hydraulic theory of tooth movement. In this theory, fluid from the vasculature, lymphatic system and intercellular spaces responds to the forces of tooth movement, damping the force and limiting movement. Bien and Baumrind expanded on this theory with their own studies in the 1960s. It is clear that both the pressure-tension and fluid flow concepts have merit, but considerable work needs to be done to ascertain the details so that tooth movement can be managed and controlled.

  11. Research on the Comprehensive Demodulation of Gear Tooth Crack Early Fault

    CUI Lingli; DING Fang; GAO Lixin; ZHANG Jianyu

    2006-01-01

    The component of gear vibration signal is very complex, when a localized tooth defect such as a tooth crack is present, the engagement of the cracked tooth will induce an impulsive change with comparatively low energy to the gear mesh signal and the background noise. This paper presents a new comprehensive demodulation method which combined with amplitude envelop demodulation and phase demodulation to extract gear crack early fault. A mathematical model of gear vibration signal contain crack fault is put forward. Simulation results based on this model show that the new comprehensive demodulation method is more effective in finding fault and judging fault level then conventional single amplitude demodulation at present.

  12. Biology of tooth replacement in amniotes

    John A Whitlock; Joy M Richman

    2013-01-01

    Tooth replacement is a common trait to most vertebrates, including mammals. Mammals, however, have lost the capacity for continuous tooth renewal seen in most other vertebrates, and typically have only 1–2 generations of teeth. Here, we review the mechanisms of tooth replacement in reptiles and mammals, and discuss in detail the current and historical theories on control of timing and pattern of tooth replacement and development.

  13. [Tooth regeneration--dream to reality].

    Wang, Song-Ling; Wang, Xue-Jiu

    2008-04-01

    Tooth or dentition missing compromises human health physically and psychiatrically. Although several prosthesis methods are used to restore tooth loss, these restorations are still non-biological methods. It is a dream for human being to regenerate a real tooth for hundreds years. There are two ways to regenerate the tooth. One is application of conventional tissue engineering techniques including seed cells and scaffold. The other is regeneration tooth using dental epithelium and dental mesenchymal cells based on the knowledge of tooth initiation and development. Marked progress has been achieved in these two ways, while there is still a long way to go. Recently a new concept has been proposed for regeneration of a biological tooth root based on tooth-related stem cells and tissue engineering technique. A biological tooth root has been regenerated in swine. It may be a valuable method for restoration of tooth loss before successful whole tooth regeneration. A latest research showed that a subpopulation in bone marrow cells can give rise to ameloblast-like cells when mixed with embryonic epithelium and reassociation with integrated mesenchyme, which may provide a new seed cell source for tooth regeneration.

  14. 21 CFR 872.3920 - Porcelain tooth.

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Porcelain tooth. 872.3920 Section 872.3920 Food... DEVICES DENTAL DEVICES Prosthetic Devices § 872.3920 Porcelain tooth. (a) Identification. A porcelain tooth is a prefabricated device made of porcelain powder for clinical use (§ 872.6660) intended for...

  15. Pulpal regeneration following allogenic tooth transplantation into mouse maxilla.

    Unno, Hideki; Suzuki, Hironobu; Nakakura-Ohshima, Kuniko; Jung, Han-Sung; Ohshima, Hayato

    2009-04-01

    Autogenic tooth transplantation is now a common procedure in dentistry for replacing a missing tooth. However, there are many difficulties in clinical application of allogenic tooth transplantation because of immunological rejection. This study aims to clarify pulpal regeneration following allogenic tooth transplantation into the mouse maxilla by immunohistochemistry for 5-bromo-2'-deoxyuridine (BrdU) and nestin, and by the histochemistry for tartrate-resistant acid phosphatase (TRAP). The upper right first molar (M1) of 2-week-old mice was extracted and allografted in the original socket in both the littermate and non-littermate after the extraction of M1. Tooth transplantation weakened the nestin-positive reactions in the pulp tissue that had shown immunoreactivity for nestin before operation. On postoperative Days 5-7, tertiary dentin formation commenced next to the preexisting dentin where nestin-positive odontoblast-like cells were arranged in all cases of the littermate group until Day 14, except for one case showing immunological rejection in the pulp chamber. In the non-littermate group, bone-like tissue formation occurred in the pulp chamber in addition to tertiary dentin formation until Day 14. The rate of tertiary dentin was 38%, and the rate of the mixed form of dentin and bone-like tissue formation was 23% (the remainder was immunological rejection). Interestingly, the periodontal tissue recovered even in the case of immunological rejection in which the pulp chamber was replaced by sparse connective tissue. These results suggest that the selection of littermate or non-littermate is decisive for the survival of odontoblast-lineage cells and that the immunological rejection does not influence the periodontal regeneration.

  16. The effect of tooth extraction and nonextraction treatment on the soft tissue profile of the subjects with border-line Angle classⅡ division 1 malocclusion%拔牙与非拔牙矫治对安氏Ⅱ类1分类错牙合临界病例软组织侧貌的影响

    常乾; 张丹; 任利玲

    2015-01-01

    The effect of extraction and nonextraction treatment on the soft tissue profile of the subjects borderline Angle classⅡ division 1 malocclusion is concerned mainly by orthodontists.This article reviewes the effect of extraction and nonextraction treatment on the soft tissue profile of the subjects with Angle classⅡ division 1 borderline patients and the important factors(such as differences between the types of tooth extraction and growth).The aim is to guide clinic diagnosis and treatment for borderline Angle classⅡ division 1 malocclusion.%拔牙与非拔牙矫治对安氏Ⅱ类1分类错�临界病例软组织侧貌的影响一直是正畸医生关心的问题。本文从拔牙矫治与非拔牙矫治对安氏Ⅱ类1分类错�临界病例软组织侧貌的影响及其主要影响因素(拔牙模式、生长发育)作一综述。以期为正畸临床安氏Ⅱ类1分类错�临界病例的诊疗起到一定的指导作用。

  17. Widespread Volumetric Brain Changes following Tooth Loss in Female Mice

    Avivi-Arber, Limor; Seltzer, Ze'ev; Friedel, Miriam; Lerch, Jason P.; Moayedi, Massieh; Davis, Karen D.; Sessle, Barry J.

    2017-01-01

    Tooth loss is associated with altered sensory, motor, cognitive and emotional functions. These changes vary highly in the population and are accompanied by structural and functional changes in brain regions mediating these functions. It is unclear to what extent this variability in behavior and function is caused by genetic and/or environmental determinants and which brain regions undergo structural plasticity that mediates these changes. Thus, the overall goal of our research program is to identify genetic variants that control structural and functional plasticity following tooth loss. As a step toward this goal, here our aim was to determine whether structural magnetic resonance imaging (sMRI) is sensitive to detect quantifiable volumetric differences in the brains of mice of different genetic background receiving tooth extraction or sham operation. We used 67 adult female mice of 7 strains, comprising the A/J (A) and C57BL/6J (B) strains and a randomly selected sample of 5 of the 23 AXB-BXA strains (AXB1, AXB4, AXB24, BXA14, BXA24) that were produced from the A and B parental mice by recombinations and inbreeding. This panel of 25 inbred strains of genetically diverse inbred strains of mice is used for mapping chromosomal intervals throughout the genome that harbor candidate genes controlling the phenotypic variance of any trait under study. Under general anesthesia, 39 mice received extraction of 3 right maxillary molar teeth and 28 mice received sham operation. On post-extraction day 21, post-mortem whole-brain high-resolution sMRI was used to quantify the volume of 160 brain regions. Compared to sham operation, tooth extraction was associated with a significantly reduced regional and voxel-wise volumes of cortical brain regions involved in processing somatosensory, motor, cognitive and emotional functions, and increased volumes in subcortical sensorimotor and temporal limbic forebrain regions including the amygdala. Additionally, comparison of the 10 BXA14

  18. Influence of minimally invasive extraction of mandibular wisdom tooth upon quality of life in patients with early pericoronitis%冠周炎初期微创拔除下颌智齿对患者生存质量的影响

    张建明; 郝元涛

    2014-01-01

    Objective To evaluate the effect of minimally invasive tooth extraction upon dental health-related quality of life in patients with early pericoronitis. Methods A total of 72 patients with early wis-dom tooth pericoronitis were enrolled in this study. The lower third molar was removed by minimally invasive tooth extraction. The Chinese version of oral health impact profile-14 (OHIP-14)was adopted to evaluate the changes in quality of life of the pateints before and 1 week after treatment. Results In total,72 third molars were removed from 72 patients. OHIP-14 total score after treatment in 72 cases was significantly lower com-pared with that before treatment (P<0. 05 ). The percentage of patients experiencing“serious pain”,“feeling uncomfortable after eating”“unsatisfied with diet”and “physiological pain”significantly differed before and after treatment (all P<0. 05 ). Conclusion Minimally invasive tooth extraction significantly improves the quality of life in patients with early pericoronitis.%目的:探讨微创拔牙法治疗冠周炎初期患者对其口腔健康相关生存质量的影响。方法以72例局限型智齿冠周炎初期患者为研究对象,采用微创拔牙法拔除患者下颌第三磨牙,采用口腔健康影响程度量表(OHIP-14)中文版评价治疗前及治疗后1周患者生存质量的变化。结果共拔除72例患者的72颗第三磨牙。72例治疗后OHIP-14总分比治疗前低,比较差异有统计学意义(P<0.05)。治疗前及治疗后“出现过明显疼痛”、“吃什么东西都不舒服”、“对自己的饮食很不满意”3个条目以及“生理性疼痛”领域的经历负面影响的个体所占百分比比较差异均有统计学意义(P均<0.05)。结论微创拔牙治疗冠周炎初期患者,能明显改善患者生存质量。

  19. 沙蒿散缓解阻生牙拔除术后日常生活活动能力影响因素的效果评价%Effect evaluation of artemisia desertorum spreng on ability of daily life after extraction of impacted tooth

    史亮; 胡开进; 于擘; 彭莲

    2003-01-01

    AIM:To investigate the effect of locally used Shahaosan on preventing the complication of extraction of impacted tooth.METHODS: 274 cases patients with extraction of impacted teeth were randomly devided into 3 groups named A,B and C.Shahaosan and Yunnan white drug were processed into drug A and B by department of pharmacy with the same color, shape and quality which are blind to doctors and patients.When the impacted teeth were extracted, administed group A(92 cases) with drug A,group B(86 cases) with drug B and group C(96 cases ) was a blank control. After the operation,incidence and severe intensity of dry socket in each group were observed and evaluated by scores.RESULTS: The incidence of dry socket in group A,B and C were 0.09% (1/92),2.32% (2/86),8.33% (8/96).There was no significant difference between group A and B, group B and C, while a significant difference showed between group A and C.The PoSSe score in group A, B and C was 19.36, 27.80 and 22.83 respectively.Afer the experiment the department of pharmacy informed that drug A is Shahaosan and drug B is Yunnan white drug.CONCLUSTON:Compiments of dry socket induced by extracting of lower jaw impacted teeth can be prevented by locally administered with Shahaosan, but no significant effect of alleviating the symptom of dental extraction.

  20. COMPUTED TOMOGRAPHY OF TOOTH RESORPTION IN CATS.

    Lang, Linda G; Wilkinson, Thomas E; White, Tammy L; Farnsworth, Raelynn K; Potter, Kathleen A

    2016-09-01

    Tooth resorption is the most common dental disease in cats and can be a source of oral pain. The current clinical gold standard for diagnosis includes a combination of oral exam and dental radiography, however early lesions are not always detected. Computed tomography (CT) of the skull, including the dental arches, is a commonly performed diagnostic procedure, however the appearance of tooth resorption on CT and the diagnostic ability of CT to detect tooth resorption have not been evaluated. The purpose of this prospective, descriptive, diagnostic accuracy study was to characterize the CT appearance of tooth resorption in a sample of affected cats and to evaluate the sensitivity and specificity of CT for tooth resorption compared to the clinical gold standard of oral exam and intraoral dental radiography. Twenty-eight cat cadaver specimens were recruited for inclusion. Each specimen was evaluated using oral exam, intraoral dental radiography, and computed tomography (four different slice thicknesses). Each tooth was evaluated for the presence or absence of tooth resorption. Teeth with lesions and a subset of normal teeth were evaluated with histopathology. On CT, tooth resorption appeared as irregularly marginated hypoattenuating defects in the mineral attenuating tooth components, most commonly involving the root or cementoenamel junction. Sensitivity for CT detection of tooth resorption was fair to poor (42.2-57.7%) and specificity was good to excellent (92.8-96.3%). Findings from this study indicated that CT has high specificity but low sensitivity for detection of tooth resorption in cats.

  1. Fluoridation and tooth wear in Irish adults.

    Burke, F M

    2010-10-01

    The aim of this study was to determine the prevalence of tooth wear in adults in Ireland and its relationship with water fluoridation. The National Survey of Adult Oral Health was conducted in 2000\\/2001. Tooth wear was determined using a partial mouth examination assessing the upper and lower anterior teeth. A total of 2456 subjects were examined. In this survey, increasing levels and severity of tooth wear were associated with ageing. Men were more affected by tooth wear and were more likely to be affected by severe tooth wear than women. It was found that age, and gender were significant predictors of tooth wear (P < 0.01). Overall, there was no significant relationship between fluoridation and tooth wear in this study.

  2. 错(牙合)畸形正畸治疗患者的拔牙与相关因素的研究%Relative factors of tooth extraction in orthodontic treatment

    王郁; 李巍然; 许天民

    2010-01-01

    Objective To investigate the extraction frequencies in different types of malocclusion, and the factors affecting decision in extraction or non-extraction. Methods As a retrospective study, it contained 1423 patients who were treated orthodontically in department of orthodsntics, Peking Univerity School of Stomatology. The extraction percentages and factors affecting the decision in extraction or non-extraction were analyzed. Results 56. 6% were extraction cases. Age, sex, degree of crowding, classification, overbite, overjet, bimaxillary protrusion,MP-SN angle and distance from Ricketts esthetic plane to the lower lip were the factors selected by Logistic regression equation. Conclusions Factors selected by Logistic regression equation contributed to the decision in extraction or non-extraction.%目的 研究不同类型错(牙合)畸形患者正畸治疗中的拔牙率,探讨临床常用研究指标对拔牙决策的贡献大小.方法 采用回顾性研究,选用了北大口腔正畸科1423例病例,研究其拔牙率及影响闪素,并对所有因素进行Logistic回归分析.结果 总样本拔牙率为56.6%.最终入选Logistic回归方程的有:年龄、上颌拥挤度、下颌拥挤度、覆盖、覆耠、下唇凸距、是否双颌前突、性别、下颌平面角以及安氏分类.结论 正畸拔牙决策的制定需要着重参考入选Logistic回归方程的因素.

  3. 下颌阻生齿拔除涡轮钻法与骨凿法的应用效果比较探析%Comparison and Analysis of the Application Effect of Mandibular Impacted Tooth Extraction Turbine Drill and Chisel Method

    王海斌; 谢珲; 贺剑

    2016-01-01

    Objective To analyze the application effect of mandibular impacted tooth extraction turbine drill and chisel method. Methods84 cases of mandibular impacted tooth patients were chosen in Haibin dental clinic from April 2014 to September 2015, according to their treatment methods were divided into observation group and control group, treatment methods were used high speed turbine drill and chisel treatment method, analysis the clinical effect of two kinds of treatment.Results In the observation group after treatment, the wound pain and limitation of mouth opening was signiifcantly better in the control group, the data among groups were compared statistically signiifcant produced.Conclusion The application of high speed turbine drilling method for mandibular teeth good curative effect in the treatment of patients.%目的:分析下颌阻生齿拔除涡轮钻法与骨凿法的应用效果。方法抽取海斌口腔诊所2014年4月~2015年9月收治的84例下颌阻生齿患者,按照其治疗方法的差异性划分为观察组以及对照组,治疗方法分别采用高速涡轮钻法以及骨凿法进行治疗,分析两种治疗方法的临床疗效。结果观察组经治疗后,其创口疼痛程度和张口受限程度好于对照组,组间数据经对比,有统计学意义。结论将高速涡轮钻法应用于下颌阻生齿患者治疗中疗效良好。

  4. Natural Tooth Pontic: An Instant Esthetic Option for Periodontally Compromised Teeth—A Case Series

    Raj, Rishi; Narayan, Ipshita; Gowda, Triveni Mavinakote; Mehta, D. S.

    2016-01-01

    Sudden tooth loss in the esthetic zone of the maxillary or mandibular anterior region can be due to trauma, periodontal disease, or endodontic failure. The treatment options for replacing the missing tooth can vary between removable prosthesis, tooth-supported prosthesis, and implant-supported prosthesis. Irrespective of the final treatment, the first line of management would be to provisionally restore the patient's esthetic appearance at the earliest, while functionally stabilizing the compromised arch. Using the patient's own natural tooth as a pontic offers the benefits of being the right size, shape, and color and provides exact repositioning in its original intraoral three-dimensional position. Additionally, using the patient's platelet concentrate (platelet rich fibrin) facilitates early wound healing and preservation of alveolar ridge shape following tooth extraction. The abutment teeth can also be preserved with minimal or no preparation, thus keeping the technique reversible, and can be completed at the chair side thereby avoiding laboratory costs. This helps the patient better tolerate the effect of tooth loss psychologically. The article describes a successful, immediate, and viable technique for rehabilitation of three different patients requiring replacement of a single periodontally compromised tooth in an esthetic region. PMID:27994892

  5. Tooth sensitivity: mechanisms and management.

    Markowitz, K

    1993-08-01

    Tooth sensitivity is a common complaint encountered in clinical practice. Exposed superficial dentin is free of nerve endings, yet sensitive. Experimental evidence indicates that stimuli, such as probing the dentin surface and air blasts, induce fluid movements in the dentinal tubules and these fluid movements, in turn, activate the intradental nerves. The condition of the dentin surface is critically important in allowing this process. In addition, the internal environment of the pulp may influence nerve excitability. Therapies for tooth sensitivity include both agents that obstruct the dentinal tubules and agents that can decrease the excitability of the intradental nerves. The exact treatment used depends on the etiology of the individual's problem and the extent of dentinal tissue damage.

  6. Clinical significance of application of calcium sulfate prevention of oral anticoagulation in patients with alveolar hemorrhage after tooth extraction%应用硫酸钙预防口服抗凝药患者拔牙后牙槽内出血的临床研究

    马小红

    2015-01-01

    目的:评估采用口服抗凝药物治疗的患者拔牙后使用半水合硫酸钙作为止血剂的止血疗效。方法选取2013年6月至2014年8月收治的拔牙同时行抗凝治疗的患者75例(95颗牙),根据随机抽样方法将患者分成实验组38例和对照组37例。对照组采用牙槽闭塞性缝合止血处理,实验组采用半水合硫酸钙填塞牙槽窝止血处理。在整个治疗过程中,两组患者均维持口服抗凝药。观察两组术前患者患牙情况,统计拔牙原因及数量;观察两组拔牙后创口愈合情况,术中及术后出血情况,术后并发症等。结果两组患者拔牙数量及手术所需时间之间比较差异无统计学意义( P >0.05);拔牙术后在连续的时间点观察,两组患者牙槽出血情况均得到控制,但实验组止血能力和创口愈合情况明显高于对照组,两组比较差异有统计学意义( P <0.05)。实验组术后并发症发生率低于对照组,两组比较差异有统计学意义( P <0.05)。结论应用半水合硫酸钙填塞控制拔牙后牙槽出血,止血效果高效、充分,患者术后愈合情况好,并发症少。%Objective To evaluate the use of calcium sulfate as a hemostatic agent after tooth extraction in patients with anticoagulant drug therapy. Methods 75 patients undergoing anticoagulant therapy,needing dental extractions,were selected in our department of stomatology dur-ing June 2013 to August 2014 for this study. The patients were divided into control group(n = 37)and experimental group(n = 38)in a random-ized way. The postextraction socket of the control group were managed with obliterative suture,while the postextraction sockets were packed with CaS. During the whole treatment process,all of the patients received maintained treatment of oral anticoagulants. The teeth surgery patient,the number of reasons for tooth extraction,wound healing after tooth extraction were observed. The

  7. Optical spectroscopy and tooth decay

    Misra, P.; De, T.; Singh, R.

    2005-11-01

    Optical spectroscopy in the ultraviolet, visible and mid-infrared spectral regions has been used to discriminate between healthy and diseased teeth of patients in the age range 15-75 years. Spectral scans of absorbance versus wavenumber and fluorescence intensity versus wavelength have been recorded and investigated for caries and periodontal disease. Such optical diagnostics can prove very useful in the early detection and treatment of tooth decay.

  8. Supernumerary Jawbone Tooth: Clinical Case

    Rivas Gutiérrez, Jesús; Carlos Sánchez, María Dolores

    2016-01-01

    Introduction: supernumerary teeth are dental development anomalies, alsoknown as hyperdontia or extra teeth. Their prevalence ranges between 0.3% and 3.8%.Their morphology may be normal or dismorphic and are associated to the etiology ofocclusal alterations. It is important to make an early diagnostic through a radiographicalstudy. Case presentation:this article presents a clinical case of a supernumerary tooth thatcaused rotation and crowding of the anterior bottom teeth, which was addressed...

  9. Charcot-Marie-Tooth disease.

    Reilly, Mary M

    2011-03-01

    Charcot-Marie-Tooth (CMT) disease is the commonest inherited neuromuscular disorder affecting at least 1 in 2,500. Over the last two decades, there have been rapid advances in understanding the molecular basis for many forms of CMT with more than 30 causative genes now described. This has made obtaining an accurate genetic diagnosis possible but at times challenging for clinicians. This review aims to provide a simple, pragmatic approach to diagnosing CMT from a clinician\\'s perspective.

  10. Prevalence and Reasons for Tooth Loss in a Sample from a Dental Clinic in Brazil

    Andréia Affonso Barretto Montandon

    2012-01-01

    Full Text Available Purpose. To evaluate the prevalence and reasons for teeth extractions in a sample from a dental clinic in Brazil. Methods. The prevalence of teeth mortality was analyzed by gender, age, tooth type and reasons for extraction on 800 teeth of 439 subjects, whose data was collected in clinical records in a convenience sample. Results. The groups with range from 35 to 44 years, 45 to 54 years and 55 to 64 years revealed significantly greater number of teeth extractions than other age groups (P<0.0001. The anterior teeth loss increased significantly with aging, while the tooth mortality of premolar and molar were higher in younger people. The caries was the more prevalent reason for tooth mortality among young and adults up to 44 years old, while the periodontal disease was the main reason for extractions from 45 years old until range of 81 years (P<0.0001. Conclusions. It can be suggested that some reasons for tooth loss were age-dependent, but the caries and the periodontal diseases were the main reasons for tooth mortality in this Brazilian sample.

  11. Adjacent tooth trauma in complicated mandibular third molar surgery: Risk degree classification and digital surgical simulation

    Ye, Zhou-Xi; Yang, Chi; Ge, Jing

    2016-01-01

    Analysis of adjacent tooth resistance is essential in wisdom teeth extraction to prevent adjacent tooth trauma, however it lacks adequate attention nowadays. This study aims at suggesting special extraction methods based on adjacent tooth resistance analysis for prevention of adjacent tooth damage. In this study, 136 complicated mandibular third molars extracted using piezosurgery were reviewed and classified based on the adjacent teeth resistances shown in orthopantomogram (OPG) during their mesio-distal rotations: degree I refers to teeth with no adjacent teeth resistance; degree II refers to teeth with resistance released after mesial-half crown sectioning; degree III refers to teeth which still had resistance after mesial-half crown sectioning. With the use of surgical simulations using cone beam computerized tomography (CBCT) reconstruction, all teeth in degree I were designed to rotate mesio-distally; 86.36%(38/44) teeth in degree II were designed to rotate mesio-distally after mesio-half crown sectioning; 69.09%(36/55) teeth in degree III were designed to rotate bucco-lingually. All teeth were extracted successfully, and only one adjacent tooth was subluxated due to the incomplete bone removal. Our study suggested that in order to prevent adjacent teeth trauma, complete bone removal is of importance, and impacted teeth with higher adjacent teeth trauma risks should consider bucco-lingual rotations. PMID:27974819

  12. Prosthetic clone and natural human tooth comparison by speckle interferometry

    Slangen, Pierre; Corn, Stephane; Fages, Michel; Raynal, Jacques; Cuisinier, Frederic J. G.

    2010-09-01

    New trends in dental prosthodontic interventions tend to preserve the maximum of "body" structure. With the evolution of CAD-CAM techniques, it is now possible to measure "in mouth" the remaining dental tissues. The prosthetic crown is then designed using this shape on which it will be glued on, and also by taking into account the contact surface of the opposite jaw tooth. Several theories discuss on the glue thickness and formulation, but also on the way to evolve to a more biocompatible crown and also new biomechanical concepts. In order to validate these new concepts and materials, and to study the mechanical properties and mechanical integrity of the prosthesis, high resolution optical measurements of the deformations of the glue and the crown are needed. Samples are two intact premolars extracted for orthodontics reasons. The reference sample has no modifications on the tooth while the second sample tooth is shaped to receive a feldspathic ceramic monoblock crown which will be glued. This crown was manufactured with a chairside CAD-CAM system from an intra-oral optical print. The software allows to realize a nearly perfect clone of the reference sample. The necessary space for the glue is also entered with ideal values. This duplication process yields to obtain two samples with identical anatomy for further processing. The glue joint thickness can also be modified if required. The purpose is to compare the behaviour of a natural tooth and its prosthetic clone manufactured with "biomechanical" concepts. Vertical cut samples have been used to deal with planar object observation, and also to look "inside" the tooth. We have developed a complete apparatus enabling the study of the compressive mechanical behaviour of the concerned tooth by speckle interferometry. Because in plane displacements are of great interest for orthodontic measurements1, an optical fiber in-plane sensitive interferometer has been designed. The fibers are wrapped around piezoelectric

  13. The comparision of the outcomes of guide bone regeneration by calcined bovine bone and Bio-Oss graft material in alveolar ridge preservation after tooth extraction%骨引导天然煅烧骨与Bio-Oss用于牙槽嵴保存效果的对比研究

    刘伟; 丁宇翔; 秦瑞峰; 侯锐; 周宏志; 张林林; 胡开进

    2014-01-01

    Objective:To compare the outcomes of guide bone regeneration by calcined bovine bone and Bio-Oss graft material in alveolar ridge preservation after tooth extraction.Methods:280 patients were divided into two groups randomly.Each patient had single tooth extracted.The sockets were filled with calcined bovine bone in 140 patients and Bio-Oss graft in another 140 patients. After shaping,all the sockets were covered with Bio-Gide membrane.Buccal mucoperiosteal flap was released and sutured to close the alveolar sockets.The patients were regularly examined at the 1st,12th and 24th week after surgery.Physical examination and X-ray evaluation were applied to compare the outcomes of the two materials in alveolar ridge preservation.Results:No infection and re-jection occurred.The radiographic results showed the width and height of the alveolar bone were preserved well at the 12th and 24th weeks.No statistically difference was found in the two groups at the 1st and 24th weeks(P>0.05).Conclusion:The two graft ma-terials can effectively preserve alveolar bone after tooth extraction.%目的:对比骨引导天然煅烧骨与Bio-Oss应用于拔牙后牙槽嵴保存的效果。方法:280例患者单颗牙拔除后,随机分为2组,将骨引导天然煅烧骨和Bio-Oss各植入140例拔牙窝中,塑形后均用Bio-Gide生物膜覆盖,颊侧黏骨膜翻瓣、滑行缝合、封闭拔牙创,并在术后第1周、12周、24周复查,拍摄全口曲面断层片及CT,评价2种植骨材料牙槽嵴保存的效果。结果:2组的大体观察均显示出了较好的结果,无感染及排斥反应。12周及24周影像学结果显示2组牙槽嵴的宽度和高度均得到了较好的保存,组间比较无统计学差异(P>0.05)。结论:2种植骨材料均能有效地保存拔牙后牙槽骨的骨量。

  14. 拔牙矫治对 AngleⅡ1错牙合成年女性面部软组织正貌的影响%Impacts of orthodontic treatment with tooth extraction on the frontal view of facial soft tissue in adult fe-males with class Ⅱ division 1 malocclusion

    谢妹洪; 劳柯杰; 覃昌焘; 马琴琴; 莫水学

    2016-01-01

    目的:探讨 AngleⅡ1错成年女性拔牙矫治后面部软组织正貌的改变。方法:采用直接活体测量法,测量51例成年女性 AngleⅡ1错患者矫治前后面部软组织正貌美学指标的改变,其中拔牙组30例,非拔牙对照组21例,并对矫治前后的变化量进行统计学分析。结果:拔牙组矫治后 N-Me、Sn-Me、Sn-UL、LL-Sm、Sto-M、Ch-Ch 增大(P <0.05),UL-LL 减小(P<0.05),Zy-Zy、Go-Go 无明显变化(P >0.05)。非拔牙组矫治后各指标均无明显变化(P >0.05)。组间比较中 Sn-UL、LL-Sm、UL-LL 差异有统计学意义(P <0.01),其余各项无统计学意义(P >0.05)。结论:成年女性 AngleⅡ1错患者通过拔牙矫治,主要表现为口周软组织的变化,开唇露齿明显改善,上下唇形态更趋协调;对面高及面宽无明显影响。%Objective:To explore the changes of orthodontic therapy with tooth extraction on frontal view of facial soft tissue in adult females with Class Ⅱ division 1 malocclusion.Methods:Frontal view of facial soft tissue aesthetic charaeteristics of 30 with and 21 without tooth extraction adult females with Class Ⅱ division 1 malocclusion were measured with direct anthropometry before and after orthodontic treatment.Results:After the extraction treatment,the distance of N-Me,Sn-Me,Sn-UL,LL-Sm,Sto-Me,Ch-Ch in-creased(P 0.05).There was no sig-nificant change in each parameter in nonextraction group(P >0.05).Between the 2 groups Sn-UL,LL-Sm and UL-LL showed differ-ence(P 0.05).Conclusion:Orthodontic treatment with tooth for the fe-males with Class Ⅱ division 1 malocclusion can improve the incompetent lips,and recover the coordination between the upper and lower lips.There is little change on facial height and width.

  15. Efficacy and safety of three modes of intravenous propofol in pain-free tooth extraction%丙泊酚静脉麻醉3种输注方式在无痛拔牙术中清醒镇静的效果和安全性比较

    高燕凤; 霍雄伟; 赵亮; 景桂霞; 吕毅

    2012-01-01

    Objective To compare the efficacy and safety of three modes of intravenous propofol in patients undergoing conscious sedation and pain-free tooth extraction. Methods Eighty outpatients with tooth extraction were randomly divided into experimental group and control group. The experimental group was sub-divided into target controlled infusion group, minipump group and manual group according to three different modes of intravenous propofol. Routine local anesthesia was used in control group. Heart rate( HR ), mean arterial pressure( MAP ) and pulse oxygen saturation( SpO2 )were recorded during operation. The depth of controlled sedation,the time of induction and recovery, and the induction dosage and total dosage of propofol were recorded in experimental group. Results In control group,HR and MAP fluctuated greatly during operation and were statistically different from those in pre-operation and post-operation ( P<0. 05 ). Compared with control group, HR and MAP were also statistically different from the other three groups during operation ( P <0. 05 ). HR and MAP in manual group and minipump group,and MAP in target controlled group all decreased significantly 1 min after infusion ( P < 0. 05 ). The Ramsay scale in target controlled group was lower than those in manual group and minipump group ( P <0. 05 ). The time of induction and recovery and the total dosage in target controlled group were statistically lower than those in manual group and minipump group( P<0.01 -0. 05). There was no significant difference in induction dosage among three experiment groups ( P < 0.05 ). There was no significant difference in SpO2 among four groups in operation. Conclusion The hemodynamics of local anesthesia combined with propofol is significantly better than the routine local anesthesia alone. The target controlled infusion of propofol is a safer and more effective anesthesia way for pain-free tooth extraction than minipump and manual infusion.%目的

  16. 复方阿替卡因与利多卡因用于老年人拔牙麻醉的临床效果比较%Clinical comparison of anesthetic efficacy on compound articaine and lidocaine used for the tooth extraction in elderly people

    夏雨凝; 许一起; 王霞

    2014-01-01

    Objective:To investigate the anesthetic efficacy and adverse reaction of the compound articaine used in tooth extraction.in elderly people.Methods:479 cases of elderly patients with conventional tooth extraction, selected from the Department of stomatology in Urumqi General Hospital of Lanzhou Military Region, Urumqi,, were randomly divided into compound articaine anesthesia group (treatment group, n= 242) and lidocaine anesthesia group (control group, n= 237), The clinical effect of anesthesia and anesthesia adverse reaction were evaluated according to the facial expression of patients and a visual analogue scale (VAS). The incidence of adverse reaction were also determined. Anesthetic efficacy was marked as totally valid, good valid, valid and invalid.Results:The anesthetic efficacy and VAS scores in the treatment group were statistically better than those in the control group (P<0.01). Onset time of anesthesia in compound articaine group was statistically better than that of lidocaine anesthesia group (P<0.05).Conclusions:The anesthetic effect of articaine has obvious advantages compared to lidocaine, a kind of traditional anesthetic. Compound articaine has the advantages of fast acting, powerful anesthetic effect, long duration and less adverse reaction. It can eliminate the mental anxiety and fear of elderly patients during tooth extraction to avoid sharp increase in blood pressure. Compound articaine is a safe and useful local anaesthetic, worth of promoting in oral surgery.%目的:探讨复方阿替卡因在我院口腔科对老年人拔牙术中观察麻醉镇痛临床疗效和不良反应的研究。方法:选自我院口腔科接受常规拔牙术的老年患者479例,随机分为复方阿替卡因麻醉组(实验组)242例和利多卡因麻醉组(对照组)各237例,比较两组的临床麻醉效果和麻醉不良反应。行拔牙术中根据患者表情和医生评价确定麻醉效果,麻醉分为完全、良好、有效

  17. Mesenchymal Stem Cells and Tooth Engineering

    Li Peng; Ling Ye; Xue-dong Zhou

    2009-01-01

    Tooth loss compromises human oral health. Although several prosthetic methods, such as artificial denture and dental implants, are clinical therapies to tooth loss problems, they are thought to have safety and usage time issues. Recently, tooth tissue engineering has attracted more and more attention. Stem cell based tissue engineering is thought to be a promising way to replace the missing tooth. Mesenchymal stem cells (MSCs) are multipotent stem cells which can differentiate into a variety of cell types. The potential MSCs for tooth regeneration mainly include stem cells from human exfoliated deciduous teeth (SHEDs), adult dental pulp stem cells (DPSCs), stem cells from the apical part of the papilla (SCAPs), stem cells from the dental follicle (DFSCs), periodontal ligament stem cells (PDLSCs) and bone marrow derived mesenchymal stem cells (BMSCs). This review outlines the recent progress in the mesenchymal stem cells used in tooth regeneration.

  18. Test Tube Tooth: The Next Big Thing

    Tahir, Mohammed; Yadav, Harsh; Sureka, Rakshit; Garg, Aarti

    2016-01-01

    Unlike some vertebrates and fishes, humans do not have the capacity for tooth regeneration after the loss of permanent teeth. Although artificial replacement with removable dentures, fixed prosthesis and implants is possible through advances in the field of prosthetic dentistry, it would be ideal to recreate a third set of natural teeth to replace lost dentition. For many years now, researchers in the field of tissue engineering have been trying to bioengineer dental tissues as well as whole teeth. In order to attain a whole tooth through dental engineering, that has the same or nearly same biological, mechanical and physical properties of a natural tooth, it’s necessary to deal with all the cells and tissues which are concerned with the formation, maintenance and repair of the tooth. In this article we review the steps involved in odontogenesis or organogenesis of a tooth and progress in the bioengineering of a whole tooth. PMID:27504430

  19. Practical whole-tooth restoration utilizing autologous bioengineered tooth germ transplantation in a postnatal canine model

    Ono, Mitsuaki; Oshima, Masamitsu; Ogawa, Miho; Sonoyama, Wataru; Hara, Emilio Satoshi; Oida, Yasutaka; Shinkawa, Shigehiko; Nakajima, Ryu; Mine, Atsushi; Hayano, Satoru; Fukumoto, Satoshi; Kasugai, Shohei; Yamaguchi, Akira; Tsuji, Takashi; Kuboki, Takuo

    2017-01-01

    Whole-organ regeneration has great potential for the replacement of dysfunctional organs through the reconstruction of a fully functional bioengineered organ using three-dimensional cell manipulation in vitro. Recently, many basic studies of whole-tooth replacement using three-dimensional cell manipulation have been conducted in a mouse model. Further evidence of the practical application to human medicine is required to demonstrate tooth restoration by reconstructing bioengineered tooth germ using a postnatal large-animal model. Herein, we demonstrate functional tooth restoration through the autologous transplantation of bioengineered tooth germ in a postnatal canine model. The bioengineered tooth, which was reconstructed using permanent tooth germ cells, erupted into the jawbone after autologous transplantation and achieved physiological function equivalent to that of a natural tooth. This study represents a substantial advancement in whole-organ replacement therapy through the transplantation of bioengineered organ germ as a practical model for future clinical regenerative medicine. PMID:28300208

  20. Prevention and Treatment of Complications after Impacted Tooth Extraction: An Overview of Systematic Reviews and Meta-Analyses%阻生牙拔除术后并发症防治的系统评价/Meta分析的汇总评价

    菅玥; 王竹; 白晨潞; 程珍; 徐海丽; 古丽萍; 曾宪涛

    2013-01-01

    Objective To evaluate the relevant systematic reviews/meta-analyses that focused on the prevention and treatment of complications after impacted tooth extraction.Methods The systematic reviews/meta-analyses on the prevention and treatment of complications after impacted tooth extraction were searched in PubMed,The Cochrane Library,CBM,CNKI and WanFang Data from inception to September 30th,2012,and a total of 15 professional journals and the references of included studies were also retrieved manually.Two reviewers screened the literature according to the inclusion criteria and extracted the data.Then the AMSTAR was used to evaluate the quality of the included studies,and the GRADE system was used to evaluate the quality of evidence.Results A total of twelve relevant systematic reviews/ meta-analyses were included,of which five focused on the prevention and treatment of dry socket,six on the prevention of swelling,seven on the prevention and treatment of pain,six on the prevention of limitation of mouth opening,two on the prevention of infection,three on the prevention of bleeding,and one on the treatment of nerve damage after tooth extraction.Based on AMSTAR,seven studies were minor limitations and five studies were moderate limitations.Based on GRADE system,two was high quality of evidence,twelve were moderate,nine were low,and seven were very low.Conclusion Currently,the systematic reviews/meta-analyses on the prevention and treatment of complications after impacted tooth extraction can provide some references for clinical practice,which should be combined with the real condition by clinical doctors when making an evidence-based decision.However,it also suggests performing more high quality and large sample studies to prove this conclusion.%目的 对防治阻生牙拔除术后并发症的系统评价/Meta分析进行汇总评价.方法 计算机检索PubMed、The Cochrane Library、CBM、CNKI和WanFang Data,收集防治阻生牙拔除术后并发症的所有系

  1. Esthesioneuroblastoma presenting as tooth pain

    Parvathi Devi

    2014-01-01

    Full Text Available Esthesioneuroblastoma, also called olfactory neuroblastoma, is a rare malignant tumor originating in the olfactory epithelium in the upper nasal cavity with intracranial extension and may also be associated with secondary sinus diseases. Esthesioneuroblastoma has been observed to cause death by distant metastasis or by invasion through the cribriform plate and secondary meningitis. It usually produces nasal obstruction, epistaxis and less commonly anosmia, headache and pain. We report a case of esthesioneuroblastoma in a 50-year-old female who reported with tooth pain as a presenting symptom.

  2. Esthesioneuroblastoma presenting as tooth pain.

    Devi, Parvathi; Bhavle, Radhika; Aggarwal, Avanti; Walia, Cherry

    2014-09-01

    Esthesioneuroblastoma, also called olfactory neuroblastoma, is a rare malignant tumor originating in the olfactory epithelium in the upper nasal cavity with intracranial extension and may also be associated with secondary sinus diseases. Esthesioneuroblastoma has been observed to cause death by distant metastasis or by invasion through the cribriform plate and secondary meningitis. It usually produces nasal obstruction, epistaxis and less commonly anosmia, headache and pain. We report a case of esthesioneuroblastoma in a 50-year-old female who reported with tooth pain as a presenting symptom.

  3. Proteoglycans and orthodontic tooth movement.

    Waddington, R J; Embery, G

    2001-12-01

    Proteoglycans represent an important and diverse family of extracellular matrix components within the connective tissues of the periodontium. This review focuses on the function and metabolism of the various proteoglycans in periodontal tissues, such as alveolar bone and periodontal ligament, and considers their potential fate in response to an orthodontic force. Such considerations provide an important background in evaluating the potential for proteoglycan metabolites, alongside other connective tissue metabolites, as biomarkers for assessing the deep-seated metabolic changes and as a diagnostic tool in monitoring orthodontic tooth movement.

  4. Frequency of orthodontic extraction

    Camila de S. Dardengo

    2016-02-01

    Full Text Available Introduction: The option of dental extraction for orthodontic purposes has been debated for more than 100 years, including periods when it was widely used in treatment, including the present, during which other methods are used to avoid dental extractions. The objective was to analyze the frequency of tooth extraction treatment performed between 1980 and 2011 at the Orthodontic Clinic of Universidade Estadual do Rio de Janeiro (UERJ. Material and Methods: The clinical records of 1484 patients undergoing orthodontic treatment were evaluated. The frequency of extractions was evaluated with regard to sex, Angle's classification, the different combinations of extractions and the period when orthodontic treatment began. Chi-square test was used to determine correlations between variables, while the chi-square test for trends was used to assess the frequency of extractions over the years. Results: There was a reduction of approximately 20% in the frequency of cases treated with tooth extraction over the last 32 years. The most frequently extracted teeth were first premolars. Patients with Class I malocclusion showed fewer extractions, while Class II patients underwent a higher number of extraction treatment. There were no statistically significant differences with regard to sex. Conclusion: New features introduced into the orthodontic clinic and new esthetic concepts contributed to reducing the number of cases treated with dental extractions. However, dental extractions for orthodontic purposes are still well indicated in certain cases.

  5. Addressing Tooth Decay in Head Start Children

    Knowlden, Adam P.; Hill, Lawrence F.; Alles-White, Monica L.; Cottrell, Randall R.

    2012-01-01

    Tooth decay is the most prevalent chronic disease of childhood. Oral health education and dental services are crucial to reducing the number of children afflicted with dental cavities. Due to limited access to preventative care, Head Start children are particularly vulnerable to tooth decay. This article outlines practical implications of a…

  6. Clinical observation of 0.5% Ropivacaine in extraction of mandibular impacted wisdom tooth%0.5%罗哌卡因应用于下颌阻生智齿拔除术的临床效果观察*

    黄玉琦; 苏涛; 陈曼曼; 袁中政

    2016-01-01

    Objective To observe the clinical effect of Ropivacaine on extraction of mandibular impacted tooth, and to compare it with Mepivacaine hydrochloride and Lidocaine. Methods A total of 78 cases who re-quired removal of mandibular impacted wisdom teeth were selected. They were randomly divided into group A, group B and group C. For local anesthesia, 27 cases in the group A received 0.5% Ropivacaine hydrochloride and epinephrine (5 ml), 25 cases in the group B received 2% Mepivacaine hydrochloride and adrenaline (1.8 ml) and 26 cases in the group C received 2% Lidocaine hydrochloride and adrenaline (5 ml). The onset time of anesthesia effect, anesthetic duration, intraoperative and postoperative pain assessment and extraction time were observed in the three groups. Data analysis was carried out with SPSS 19.0 software package. Results There were significant differences in the onset time of anesthesia effect, anesthetic duration and postoperative pain degree between the groups A and C ( 0.05). There was no significant difference in extraction time, use of the flap, bone removal, or degree of postoperative pain among the three groups using different anesthetics ( > 0.05). Conclusions Compared with Lidocaine, 0.5% Ropivacaine has the advantages in clinical extraction of mandibular impacted tooth, such as rapid onset time of anesthesia effect, longer anesthetic duration and milder postoperative pain; but it has similar effect with Mepivacaine.%目的:通过对罗哌卡因(A组)与盐酸甲哌卡因肾上腺素注射液(B组)、盐酸利多卡因(C组)的比较,对罗哌卡因应用于拔除下颌阻生牙的临床效果进行观察。方法将需要拔除下颌阻生牙的患者78例,随机分为A、B、C 3组。A组27例,采用0.5%盐酸罗哌卡因加肾上腺素注射5 ml;B组25例,采用盐酸甲哌卡因肾上腺素注射液1.8 ml;C组26例采用盐酸利多卡因加肾上腺素注射5 ml。观察3组的麻醉药物起效时间、麻醉药

  7. USE THE REIMPLANTED TOOTH AS ABUTMENT FOR FIXED PAR TIAL DENTURE

    Golmoradizadeh

    2013-04-01

    Full Text Available ABSTRACT: OBJECTIVE: Use of the fixed partial denture is more favorable t han the removable partial denture for my patient, she complained about e dentulism in upper right side and a little discomfort with second upper premolar. Clinical examin ation shows the tooth was crown less and radio graphically tooth had a big periapical lesi on with poor prognosis. METHOD: After root canal treatment and extraction the tooth, clea n and irrigate the socket, we are implanted it with hydroxyapatite again and follow the patient for six months. After six months, radio graph shows that the tooth was in ideal condition without mobility, then the tooth has used as an abutment for fixed partial denture with canine and 2 nd molar in order to have a better prognosis we used semi precision attachment, and foll ow her for three years. RESULT: Three years follow the patient shows the tooth is in an ac ceptable condition radio-graphically without mobility and patient was comfortable esthetically a nd functionally. CONCLUSION: In my opinion in this case use of the hydroxyapatite, crown lengthening during the re- implantation and use the semi precision attachment was the reaso n of increase the prognosis after treatment

  8. Biologically Based Restorative Management of Tooth Wear

    Martin G. D. Kelleher

    2012-01-01

    Full Text Available The prevalence and severity of tooth wear is increasing in industrialised nations. Yet, there is no high-level evidence to support or refute any therapeutic intervention. In the absence of such evidence, many currently prevailing management strategies for tooth wear may be failing in their duty of care to first and foremost improve the oral health of patients with this disease. This paper promotes biologically sound approaches to the management of tooth wear on the basis of current best evidence of the aetiology and clinical features of this disease. The relative risks and benefits of the varying approaches to managing tooth wear are discussed with reference to long-term follow-up studies. Using reference to ethical standards such as “The Daughter Test”, this paper presents case reports of patients with moderate-to-severe levels of tooth wear managed in line with these biologically sound principles.

  9. Measurement accuracy and reliability of tooth length on conventional and CBCT reconstructed panoramic radiographs

    Carlos Flores-Mir

    2014-10-01

    Full Text Available INTRODUCTION: This in vivo study assessed accuracy and reliability of tooth length measurements obtained from conventional panoramic radiographs and CBCT panoramic reconstructions to that of a digital caliper (gold standard. METHODS: The sample consisted of subjects who had CBCT and conventional panoramic radiographic imaging and who required maxillary premolar extraction for routine orthodontic treatment. A total of 48 teeth extracted from 26 subjects were measured directly with digital calipers. Radiographic images were scanned and digitally measured in Dolphin 3D software. Accuracy of tooth length measurements made by CBCT panoramic reconstructions, conventional panoramic radiographs and digital caliper (gold standard were compared to each other by repeated measures one-way ANOVA with Bonferroni correction and by single measures intraclass correlation coefficient. RESULTS: Repeated root length measures with digital calipers, panoramic radiographs and CBCT constructed panoramic-like images were all individually highly reliable. Compared to the caliper (gold standard, tooth measurements obtained from conventional panoramic radiographs were on average 6.3 mm (SD = 2.0 mm longer, while tooth measurements from CBCT panoramic reconstructions were an average of 1.7 mm (SD = 1.2 mm shorter. CONCLUSIONS: In comparison to actual tooth lengths, conventional panoramic radiographs were relatively inaccurate, overestimating the lengths by 29%, while CBCT panoramic reconstructions underestimated the lengths by 4%.

  10. Digital Radiography for Determination of Primary Tooth Length: In Vivo and Ex Vivo Studies

    Maria D. Basso

    2015-01-01

    Full Text Available Background. Methods for determining the root canal length of the primary tooth should yield accurate and reproducible results. In vitro studies show some limitations, which do not allow their findings to be directly transferred to a clinical situation. Aim. To compare the accuracy of radiographic tooth length obtained from in vivo digital radiograph with that obtained from ex vivo digital radiograph. Method. Direct digital radiographs of 20 upper primary incisors were performed in teeth (2/3 radicular resorption that were radiographed by an intraoral sensor, according to the long-cone technique. Teeth were extracted, measured, and mounted in a resin block, and then radiographic template was used to standardise the sensor-target distance (30 cm. The apparent tooth length (APTL was obtained from the computer screen by means of an electronic ruler accompanying the digital radiography software (CDR 2.0, whereas the actual tooth length (ACTL was obtained by means of a digital calliper following extraction. Data were compared to the ACTL by variance analysis and Pearson’s correlation test. Results. The values for APTL obtained from in vivo radiography were slightly underestimated, whereas those values obtained from ex vivo were slightly overestimated. No significance was observed (P≤0.48 between APTL and ACTL. Conclusion. The length of primary teeth estimated by in vivo and ex vivo comparisons using digital radiography was found to be similar to the actual tooth length.

  11. Mechanism of human tooth eruption

    Kjær, Inger

    2014-01-01

    Human eruption is a unique developmental process in the organism. The aetiology or the mechanism behind eruption has never been fully understood and the scientific literature in the field is extremely sparse. Human and animal tissues provide different possibilities for eruption analyses, briefly...... discussed in the introduction. Human studies, mainly clinical and radiological, have focused on normal eruption and gender differences. Why a tooth begins eruption and what enables it to move eruptively and later to end these eruptive movements is not known. Pathological eruption courses contribute......, and the ability of the periodontal ligament to adapt to eruptive movements. Animal studies and studies on normal and pathological eruption in humans can support and explain different aspects in the new theory. The eruption mechanism still needs elucidation and the paper recommends that future research on eruption...

  12. Tooth crown heights, tooth wear, sexual dimorphism and jaw growth in hominoids.

    Dean, M C; Beynon, A D

    1991-01-01

    The aim of this review is to bring together data that link tooth morphology with tooth function and tooth growth: We aim to show how the microanatomy of hominoid teeth is providing evidence about rates of tooth growth that are likely to be a consequence of both masticatory strategy and social behaviour. First, we present data about incisor and molar tooth wear in wild short chimpanzees that demonstrate how crown heights are likely to be related to relative tooth use in a broad sense. Following this we review recent studies that describe the microanatomy of hominoid tooth enamel and show how these studies are providing evidence about tooth crown formation times in hominoids, as well as improving estimates for the age at death of certain juvenile fossil hominids. Next, we outline what is known about the mechanisms of tooth growth in the sexually dimorphic canine teeth of chimpanzees and compare these patterns of growth with tooth growth patterns in the canines of three fossil hominids from Laetoli, Tanzania. Finally, we discuss how selection pressures that operate to increase or reduce the size of anterior teeth interact with jaw size. We argue that the space available to grow developing teeth in the mandibles of juvenile hominoids is determined by the growth patterns of the mandibles, which in turn reflect masticatory strategy. The consequences of selection pressure to grow large or small anterior teeth are likely to be reflected in the times at which these teeth are able to emerge into occlusion.

  13. Spectroscopic investigations of carious tooth decay.

    Thareja, R K; Sharma, A K; Shukla, Shobha

    2008-11-01

    We report on the elemental composition of healthy and infected part of human tooth using laser induced breakdown spectroscopy (LIBS). We have used prominent constituent transitions in laser-excited tooth to diagnose the state of the tooth. A nanosecond laser pulse (355nm, 5ns) was used as an ablating pulse and the sodium (3s2S-3p2P) at 588.99 and (3s2S-3p2P) at 589.99nm, strontium (5s21S-1s5P) at 460.55nm, and calcium (3d3D-4f 3F0) at 452.55nm transitions for spectroscopic analysis. The spectroscopic observations in conjunction with discriminate analysis showed that calcium attached to the hydroxyapatite structure of the tooth was affected severely at the infected part of the tooth. The position-time plots generated from two-dimensional (2D) images conclusively showed a decrease in calcium concentration in the infected region of the irradiated tooth. Using the technique, we could distinguish between the healthy and carious parts of the tooth with significant accuracy.

  14. TOOTH CONTACT ANALYSIS OF CONICAL INVOLUTE GEARS

    2006-01-01

    The mathematical model of conical involute gears is developed based on the theory of gearing and the generating mechanism. Tooth contact analysis (TCA) is performed to examine the meshing and bearing contact of the conical involute gear pairs with intersected and crossed axes. In addition, the principal directions and curvatures of the gear surfaces are investigated and the contact ellipses of the mating tooth surfaces are also studied. Finally, the numerical illustrative examples are provided to demonstrate the computational results, test gears are made for tooth-bearing tests, and the conclusion is verified that the theory has the applicability.

  15. Application of Nitrous Oxide Inhalation Sedation in Impacted Tooth Extraction with Pharyngeal Sensitive Patients%笑气吸入在咽反射敏感患者阻生齿拔除术中的应用

    柳洪志; 张玮; 王天祥; 王迪; 王晓艳; 刘昱新

    2013-01-01

    目的:观察笑气(N2O)吸入应用于咽反射敏感患者高、中位阻生齿拔除术的临床效果.方法:60例需拔除下颌高、中位近中阻生齿并伴咽反射敏感的患者,随机分为3组,每组20例(A组:N2O吸入组;B组:盐酸丁卡因胶浆涂抹组;C组:空白对照组).记录3组术前、术中、术后的血压(BP)、心率(HR)及血氧饱和度(SpO2),通过量表分析正常的操作触碰和高速涡轮牙钻喷水,对其咽部刺激、导致肌紧张程度、引起咽反射次数及耐受程度.结果:在整个手术过程中,A组BP、HR、SpO2变化平稳(P>0.05);B组术中和术后的BP、HR与术前比较有统计学意义;C组术中和术后的BP、HR与术前比较有统计学意义(P<0.05),SpO2无明显变化(P>0.05).实验组与对照组各项评定指标的比较均有统计学意义(P<0.05).结论:笑气吸入在下颌阻生齿拔除过程中,可明显降低患者咽反射敏感性,安全可靠.%Objective:To investigate the clinical effects of nitrous oxide inhalation in extraction of high and medium positioned impacted teeth in pharyngeal sensitive patients. Methods: This retrospective study consisted of 60 patients and randomly divided into three groups: group A (n=20), nitrous oxide inhalation; group B (n=20), tetracaine hydrochloride mucilage daubing; and group C (n=20), the control group. BP, HR, and SpO2 of every case were recorded before operation , during the operation, and post-operation. Through the scale analysis, to compare the muscle tension, and the number of pharyngeal reflex and tolerance effected by routine operative contact to the pharyngeal wall and turbine spray stimulation, on pharyngeal wall. Results: During the operation process, HR, BP and SpO2 of group A patients smoothly changed (P>0.05). BP and HR of patients in the group B and C in perioperative and post-operative period, showed significant difference compared with preoperative period (P0.05). The evaluation indicators of experimental

  16. Evolution of high tooth replacement rates in sauropod dinosaurs.

    Michael D D'Emic

    Full Text Available BACKGROUND: Tooth replacement rate can be calculated in extinct animals by counting incremental lines of deposition in tooth dentin. Calculating this rate in several taxa allows for the study of the evolution of tooth replacement rate. Sauropod dinosaurs, the largest terrestrial animals that ever evolved, exhibited a diversity of tooth sizes and shapes, but little is known about their tooth replacement rates. METHODOLOGY/PRINCIPAL FINDINGS: We present tooth replacement rate, formation time, crown volume, total dentition volume, and enamel thickness for two coexisting but distantly related and morphologically disparate sauropod dinosaurs Camarasaurus and Diplodocus. Individual tooth formation time was determined by counting daily incremental lines in dentin. Tooth replacement rate is calculated as the difference between the number of days recorded in successive replacement teeth. Each tooth family in Camarasaurus has a maximum of three replacement teeth, whereas each Diplodocus tooth family has up to five. Tooth formation times are about 1.7 times longer in Camarasaurus than in Diplodocus (315 vs. 185 days. Average tooth replacement rate in Camarasaurus is about one tooth every 62 days versus about one tooth every 35 days in Diplodocus. Despite slower tooth replacement rates in Camarasaurus, the volumetric rate of Camarasaurus tooth replacement is 10 times faster than in Diplodocus because of its substantially greater tooth volumes. A novel method to estimate replacement rate was developed and applied to several other sauropodomorphs that we were not able to thin section. CONCLUSIONS/SIGNIFICANCE: Differences in tooth replacement rate among sauropodomorphs likely reflect disparate feeding strategies and/or food choices, which would have facilitated the coexistence of these gigantic herbivores in one ecosystem. Early neosauropods are characterized by high tooth replacement rates (despite their large tooth size, and derived titanosaurs and

  17. Regenerative Applications Using Tooth Derived Stem Cells in Other Than Tooth Regeneration: A Literature Review.

    Park, Yun-Jong; Cha, Seunghee; Park, Young-Seok

    2016-01-01

    Tooth derived stem cells or dental stem cells are categorized according to the location from which they are isolated and represent a promising source of cells for regenerative medicine. Originally, as one kind of mesenchymal stem cells, they are considered an alternative of bone marrow stromal cells. They share many commonalties but maintain differences. Considering their original function in development and the homeostasis of tooth structures, many applications of these cells in dentistry have aimed at tooth structure regeneration; however, the application in other than tooth structures has been attempted extensively. The availability from discarded or removed teeth can be an innate benefit as a source of autologous cells. Their origin from the neural crest results in exploitation of neurological and numerous other applications. This review briefly highlights current and future perspectives of the regenerative applications of tooth derived stem cells in areas beyond tooth regeneration.

  18. Tooth resorption in cats: contribution of vitamin D and inflammation

    Vrieling, H.E.

    2010-01-01

    Tooth resorption in cats Tooth resorption affecting several teeth is a painful disease with a prevalence of up to 75% in household cats and is often accompanied by periodontitis. Tooth resorption is caused by an increased number and activity of tooth-resorbing odontoclasts, cells that share function

  19. External resorption presenting as an intracoronal radiolucent lesion in a pre-eruptive tooth.

    McNamara, C M

    1997-09-01

    A large intracoronal radiolucent lesion in an unerupted permanent molar was found during the routine assessment of a young male Caucasian prior to orthodontic treatment. The tooth was extracted. Histological examination indicated the lesion was caused by external resorption. The defect extended widely into the enamel and dentine, and was repaired in part by bone. The pulp chamber was not involved. The aetiology of these lesions is often obscure but in this case it appeared to have originated in the floor of two developmental pits on the occlusal surface of the tooth.

  20. Fragment reattachment associated with pulpotomy in a posterior tooth with incomplete root formation.

    Alcântara, Carlos Eduardo Pinto; Corrêa-Faria, Patrícia; Tavano, Karine Taís Aguiar; Botelho, Adriana Maria

    2011-12-01

    This article reports a case of preserving pulp vitality combined with aesthetics and functional reconstruction of an immature permanent molar extensively destroyed because of a carious lesion. After a pulpotomy using calcium hydroxide, the tooth crown was restored by bonding a dental fragment obtained from an extracted tooth from another individual. Aspects of diagnosis and treatment that directly affect the prognosis of the techniques are discussed. Radiographic and clinical follow-up for two years showed complete root development and a very satisfactory restoration with regard to aesthetics and function.

  1. Extraction of impacted wisdom tooth with piezosurgery and highspeed drill%超声骨刀配合涡轮钻拔除下颌阻生智齿的临床研究

    乔峰; 陈刚

    2011-01-01

    目的:评价超声骨刀配合涡轮钻拔除下颌低位水平阻生智齿的临床效果.方法:采用随机分组、自身交叉对照的临床万法,选取两侧牙齿阻生类型相似的60名患者(120颗下颌低位水平阻生智齿)随机分为A、B两组,A组一侧先用超声骨刀配合涡轮钻(实验组)拔除,另一侧单独用涡轮钻(对照组)拔除,B组顺序相反.两次操作间隔2月.记录手术时间、张口受限程度、术后疼痛程度、肿胀程度及术中出血量,采用SpSS15.0统计软件进行分析.结果:实验组术后疼痛程度、张口受限程度、肿胀程度术中出血量均小于对照组(P<0.05)手术时间对照组大于实验组( P<0.05).结论:超声骨刀配合涡轮钻拔除下颌阻生智齿可以发挥各自优点,更好地降低术后并发症达到微创操作的目的.%Objective: To evaluate the clinical efficacy of piezosurgery cooperated with highspeed drill on the extraction of impacted niandibular third molar. Methods: 60 patients with similar mandihular 1hird moiar (resistance to the adjacent teeth, bone resistance and douhle roots) were divided into two groups randomly, the treatment group receiving piezosurgery with highspeed drill and control groups receiving highspeed drill only. The operaiion time, the degree of postoperative pain, limited mouth opening, swelling and bleeding were recorded. Results: The rate of complications in the treatment group was lower (P<0.05). The operaling time and bleeding duration in treatment group was shorter than that in control group (P<0.05). Conclusion: Piezosurgery together with highspeed drill may reduce postoperative complications and achieve the purpose of minimally invasive surgery in mandibldar impacted wisdom looth removal.

  2. Application effectiveness of computer-aided oral local anesthesia apparatus on hypertension patients with tooth extraction%计算机辅助口腔局部麻醉仪在高血压病拔牙患者中的应用效果

    王秀坤; 陈志远; 王冰; 高彤; 白俊霞; 梁楠; 李馨

    2015-01-01

    Objective To evaluate the effectiveness of clinical nursing on hypertension patients with tooth extraction by using computer-aided oral local anesthesia technology. Methods A total of 72 hypertension patients, who had tooth extraction and were selected from January 2014 to December 2014 in Beijing Tongren Hospital, were randomly divided into the observation group (36 cases) and the control group (36 cases). The painless oral local anesthesia apparatus were used for patients in the observation group and the traditional manual injection of local anesthetic injection was used for these in the control group. The scores of modified dental anxiety scale ( MDAS) and the visual analogue scale ( VAS ) was recorded, the blood pressure and the heart rate were measured in all cases before, during and after local anesthesia. Results The score of VAS in the observation during local anesthesia was significantly lower than that in the control group that VAS score decreased in 86. 11% patients (31/36) in the observation group comparing with 38. 89% (14/36) in the control group (P0. 05). Conclusions The computer-aided oral local anesthesia technique can effectively control the dental anxiety, relieve pain in anesthesia injection and discomfort, effectively control blood pressure and heart rate, and is conducive to the smooth process of nursing work.%目的:探讨高血压病拔牙患者应用计算机辅助口腔局部麻醉技术的临床护理效果。方法选取2014年1—12月在北京同仁医院口腔科预约拔牙的高血压病患者72例,将患者随机分为观察组和对照组,各36例。观察组采用无痛口腔局麻注射仪进行局部麻醉注射,对照组采用传统手动注射方式进行局部麻醉注射。麻醉前、中、后分别对患者进行改良牙科焦虑量表评分( MADS )、视觉模拟( VAS)标尺表评分,并测定血压和心率。结果观察组患者局麻注射时的VAS评分低于对照组,差异有统计学意义(t=3.321,P0.05)。

  3. Impacted supernumerary tooth in coronoid process: a case report

    Park, Won Se; Lee, Je Ho; Park, Hyok; Jung, Ho Gul; Kim, Kee Deog [Yonsei University College of Dentistry, Seoul (Korea, Republic of)

    2010-06-15

    Impaction of tooth is a situation in which an unerupted tooth is wedged against another tooth or teeth or otherwise located so that it cannot erupt normally. The supernumerary tooth is also called as hyperdontia and defined as the condition of having additional tooth to the regular number of teeth. The most common supernumerary tooth is a mesiodens, which is a mal-formed, peg-like tooth that occurs between the maxillary incisors. The supernumerary tooth is commonly impacted but they are frequently impacted on maxilla. Ectopic impaction of supernumerary tooth on mandibular condyle, coronoid process, ascending ramus, and pterygomandibular space is very rare condition. In this case, we report a case of impacted supernumerary tooth on mandibular sigmoid notch without definite pathologic change.

  4. Critical appraisal. In-office tooth whitening: pulpal effects and tooth sensitivity issues.

    Kwon, So Ran; Swift, Edward J

    2014-01-01

    In-office bleaching is an effective method for whitening teeth.Tooth sensitivity associated with in-office whitening is reversible and may range from mild to considerable. The incidence and severity of tooth sensitivity can be reduced by pretreatment with a desensitizer such as potassium nitrate. Histologic studies and clinical studies on long-term pulpal effects are lacking to definitively support the safety of in-office tooth whitening. Future studies on the etiology of tooth sensitivity related to whitening might greatly improve the means of preventing and managing this side effect.

  5. Genetics And Tooth Anomalies - An Update

    Aswathy Brahmanandan

    2013-01-01

    Full Text Available Tooth development like the development of all epithelial appendages is regulated by inductive tissue interactions between epithelium and mesenchyme. Numerous genes interact, either act in conjunction or antagonize each other in odontogenesis. A number of different mesenchymal molecules and their receptors act as mediators in epithelial mesenchymal interactions. Several genes linked with early tooth positioning and developments belong to signaling pathways and have morphogenesis regulatory functions in morphogenesis of other organs. Their mutations often show pleiotropic effects beyond dental morphogenesis. In contrast, certain genes involved in enamel and dentin structures are highly specific for tooth. Mutations in these genes have been identified as causes of Amelogenesis Imperfecta (AI, Dentinogenesis Imperfecta (DI, Dentin Dysplasia (DD and anomalies in tooth number. This article focuses on genetic basis of inherited non-syndromic teeth disorders.

  6. Charcot-Marie-Tooth and Related Diseases

    ... of France, and Howard Henry Tooth of the United Kingdom. Although most people have never heard of CMT, ... CMT provided by patients and families. (See http://neurology.med. wayne.edu/neurogenetics/na_database. php.) MDA ...

  7. Dose estimation by ESR on tooth enamel from two workers exposed to radiation due to the JCO accident.

    Shiraishi, Kunio; Iwasaki, Midori; Miyazawa, Chyuzo; Yonehara, Hidenori; Matsumoto, Masaki

    2002-09-01

    ESR dosimetry is useful to estimate the external dose for the general population as well as for occupational workers in a nuclear emergency. Three teeth were extracted from two exposed workers (A and B) related to the JCO criticality accident. Tooth enamel was carefully separated from other tooth parts and subjected to ESR dosimetry. Doses equivalent to the gamma-ray dose of 60Co were estimated as follows: for worker A, the buccal and lingual sides of the eighth tooth in the upper right side, 11.8 +/- 3.6 and 12.0 +/- 3.6 Gy, respectively; for worker B, the buccal and lingual sides of the fourth tooth in the upper right side and the fifth tooth in the upper left side, 11.3 +/- 3.4 and 10.8 +/- 3.3 Gy, 11.7 +/- 3.5 and 11.4 +/- 3.4 Gy, respectively. The estimated doses were found to be similar and not dependent on the tooth positions, whether the buccal or lingual sides in each tooth.

  8. Determination of tooth clearances at trochoidal pump

    Ivanović, Lozica T.; Erić, Milan D.; Stojanović, Blaža Ž.; id_orcid 0000-0003-4790-2856; Ilić, Andreja B.

    2011-01-01

    The paper describes the development of a mathematical model of trochoidal gearing with clearances. Gearing of a trochoidal pump's gear set with an outer gear having one gear tooth more than an inner gear is analyzed. The inner gear tooth profile is described by peritrochoidal equidistance and the outer gear profile by a circular arc. Upon the basic principles of ideal profile generation, a mathematical model of gearing with clearances is developed. Using an analytical model, the calculation o...

  9. An Alternative Efficient Technique For Thin Tooth Sectioning

    Muneer Gohar Babar

    2011-06-01

    Full Text Available Background: The importance of tooth sectioningis realized in disasters such as earthquake, airplanecrash investigation, terror, micro leakage studies, ageestimation etc. The objective of this study was to developa simple method to make thin sections (approximately100 mm from freshly extracted teeth.Methods: One hundred and twenty human premolarsrecently extracted for orthodontic purpose were used forthis study. The teeth were stored in 0.5% chorlaraminefor 2 weeks and were not allowed to dry at any stageof the experiment. The teeth were thoroughly washedin distilled water teeth and then were sectionedbuccolingually from crown to the root portion.Results: A detailed embedding-cutting-mountingprocedure is described. The prepared thin groundsections were then examined under a Polarised lightmicroscope for the enamel and the dentine, as well asthe caries lesions can clearly be distinguished.Conclusion: This is an effective and efficient methodfor preparation of ground sections in which the hardtissue details are preserved.

  10. Bio-Root and Implant-Based Restoration as a Tooth Replacement Alternative.

    Gao, Z H; Hu, L; Liu, G L; Wei, F L; Liu, Y; Liu, Z H; Fan, Z P; Zhang, C M; Wang, J S; Wang, S L

    2016-06-01

    We previously reported that dental stem cell-mediated bioengineered tooth root (bio-root) regeneration could restore tooth loss in a miniature pig model. As a potential new method for tooth restoration, it is essential to compare this method with the widely used commercial dental implant-based method of tooth restoration. Tooth loss models were created by extracting mandibular incisors from miniature pigs. Allogeneic periodontal ligament stem cells (PDLSCs) and dental pulp stem cells (DPSCs) were isolated and cultured. A PDLSC sheet was prepared by adding 20.0 µg/mL vitamin C to the culture medium; in addition, a hydroxyapatite tricalcium phosphate (HA/TCP)/DPSC graft was fabricated and cultured in a 3-dimensional culture system. A total of 46 bio-root implantations and 9 dental implants were inserted, and crown restorations were performed 6 mo after implantation. Histological, radiological, biomechanical, and elemental analyses were used to evaluate and compare tissue-engineered bio-roots and dental implants to the natural tooth roots. After 6 mo, both computed tomography scans and histological examinations showed that root-like structures and dentin-like tissues had formed. Three months after crown restoration, clinical assessments revealed that tooth function was equivalent in the regenerated bio-root and the dental implant. Biomechanical testing showed that the bio-roots were similar to natural tooth roots in compressive strength, modulus of elasticity, and torsional force; however, these properties were significantly higher in the dental implants. Elemental analysis revealed a higher similarity in elemental composition between bio-roots and natural tooth roots than between bio-roots and dental implants. However, the dental implant success rate was 100% (9 of 9) and the bio-root success rate was only 22% (10 of 46). Taken together, we showed that an allogeneic HA/TCP/DPSC/PDLSC sheet could successfully build a bio-root with structure and function similar to

  11. Frictional Effects on Gear Tooth Contact Analysis

    Zheng Li

    2013-01-01

    Full Text Available The present paper concentrates on the investigations regarding the situations of frictional shear stress of gear teeth and the relevant frictional effects on bending stresses and transmission error in gear meshing. Sliding friction is one of the major reasons causing gear failure and vibration; the adequate consideration of frictional effects is essential for understanding gear contact behavior accurately. An analysis of tooth frictional effect on gear performance in spur gear is presented using finite element method. Nonlinear finite element model for gear tooth contact with rolling/sliding is then developed. The contact zones for multiple tooth pairs are identified and the associated integration situation is derived. The illustrated bending stress and transmission error results with static and dynamic boundary conditions indicate the significant effects due to the sliding friction between the surfaces of contacted gear teeth, and the friction effect can not be ignored. To understand the particular static and dynamic frictional effects on gear tooth contact analysis, some significant phenomena of gained results will also be discussed. The potentially significant contribution of tooth frictional shear stress is presented, particularly in the case of gear tooth contact analysis with both static and dynamic boundary conditions.

  12. Tooth enamel and enameloid in actinopterygian fish

    I.SASAGAWA; M.ISHIYAMA; H.YOKOSUKA; M.MIKAMI; T.UCHIDA

    2009-01-01

    The morphological features of tooth enamel and enameloid in actinopterygian fish are reviewed to provide basic data concerning the biomineralization of teeth in lower vertebrates. Enameloid, which covers the tooth surface, is a unique well-mineralized tissue and usually has the same functions as mammalian tooth enamel. However, the development of enameloi is different from that of the enamel produced by dental epithelial cells. Enameloid is made by a combination of odontoblasts and dental epithelial cells. An organic matrix that contains collagen is provided by odontoblasts, and then dental epithelial cells dissolve the degenerate matrix and suooly inorganic ions during advanced crystal growth in enameloid. It is likely that enameloid is a good model for studying the growth of well-mineralized hard tissues in vertebrates. Some actinopterygian fish possess a collar enamel layer that is situated at the surface of the tooth shaft, indicating that the origin of tooth enamel is found in fish. Collar enamel is thought to be a precursor of mammalian enamel, although it is thin and not well mineralized in comparison with enameloid. In Lepisosteus and Polypterus, both of which are living actinopterygians,both enameloid and enamel are found in the same tooth. Therefore, they ace suitable materials for examining the developmental processes of enameloid and enamel and the relationship among them.

  13. Multivariate image analysis of laser-induced photothermal imaging used for detection of caries tooth

    El-Sherif, Ashraf F.; Abdel Aziz, Wessam M.; El-Sharkawy, Yasser H.

    2010-08-01

    Time-resolved photothermal imaging has been investigated to characterize tooth for the purpose of discriminating between normal and caries areas of the hard tissue using thermal camera. Ultrasonic thermoelastic waves were generated in hard tissue by the absorption of fiber-coupled Q-switched Nd:YAG laser pulses operating at 1064 nm in conjunction with a laser-induced photothermal technique used to detect the thermal radiation waves for diagnosis of human tooth. The concepts behind the use of photo-thermal techniques for off-line detection of caries tooth features were presented by our group in earlier work. This paper illustrates the application of multivariate image analysis (MIA) techniques to detect the presence of caries tooth. MIA is used to rapidly detect the presence and quantity of common caries tooth features as they scanned by the high resolution color (RGB) thermal cameras. Multivariate principal component analysis is used to decompose the acquired three-channel tooth images into a two dimensional principal components (PC) space. Masking score point clusters in the score space and highlighting corresponding pixels in the image space of the two dominant PCs enables isolation of caries defect pixels based on contrast and color information. The technique provides a qualitative result that can be used for early stage caries tooth detection. The proposed technique can potentially be used on-line or real-time resolved to prescreen the existence of caries through vision based systems like real-time thermal camera. Experimental results on the large number of extracted teeth as well as one of the thermal image panoramas of the human teeth voltanteer are investigated and presented.

  14. Qualitative evaluation of the adesive interface between lithium disilicate, luting composite and natural tooth.

    Mobilio, Nicola; Fasiol, Alberto; Catapano, Santo

    2016-01-01

    Aim of this work was to qualitatively evaluate the interface between tooth, luting composite and lithium disilicate surface using a scanning electron microscope (SEM). An extracted restoration-free human molar was stored in physiological solution until it was embedded in an autopolimerysing acrylic resin. A standard preparation for overlay was completed and after preparation an anatomic overlay was waxed on the tooth and then hot pressed using lithium disilicate ceramic. After cementation the sample was dissected and the section was analysed using an Automatic Micromet (Remet s.a.s) and the section was analyzed using a scanning electron microscope (SEM). SEM evaluation of the tooth showed the three layers seamlessly; by increasing the enlargement the interface did not change.

  15. New regenerative treatment for tooth and periodontal bone defect associated with posttraumatic alveolar bone crush fracture.

    Kiyokawa, Kensuke; Kiyokawa, Munekatsu; Takagi, Mikako; Rikimaru, Hideaki; Fukaya, Takuji

    2009-05-01

    We developed a new regenerative treatment of tooth and periodontal defect and tooth dislocation associated with posttraumatic alveolar bone crush fracture in the region of the maxillary anterior teeth. Using this method, dislocated teeth are first extracted and crushed alveolar bone is debrided. The dislocated teeth are then reimplanted, and cancellous iliac bone (bone marrow) is grafted to the area surrounding the teeth to regenerate periodontal bone. Tooth reimplantation was completely successful in 2 cases, and periodontal bone regenerated to a sufficient height with the iliac bone graft. Compared with the general method of treatment with a prosthesis (bridge), when using this method to treat cases such as these, there is no sacrifice of healthy teeth adjacent to the defect, and sufficient esthetic and functional recovery is possible. It is thought that this method could be applied as a new treatment of alveolar bone fracture in the future.

  16. Early detection of tooth wear by en-face optical coherence tomography

    Mărcăuteanu, Corina; Negrutiu, Meda; Sinescu, Cosmin; Demjan, Eniko; Hughes, Mike; Bradu, Adrian; Dobre, George; Podoleanu, Adrian G.

    2009-02-01

    Excessive dental wear (pathological attrition and/or abfractions) is a frequent complication in bruxing patients. The parafunction causes heavy occlusal loads. The aim of this study is the early detection and monitoring of occlusal overload in bruxing patients. En-face optical coherence tomography was used for investigating and imaging of several extracted tooth, with a normal morphology, derived from patients with active bruxism and from subjects without parafunction. We found a characteristic pattern of enamel cracks in patients with first degree bruxism and with a normal tooth morphology. We conclude that the en-face optical coherence tomography is a promising non-invasive alternative technique for the early detection of occlusal overload, before it becomes clinically evident as tooth wear.

  17. Extraction Site Preservation Using FDBA With Bioxclude vs. FDBA With Bio-Gide: A Randomized Clinical Trial

    2015-06-01

    Page 2 2 2 16 5. Cast after removing the tooth planned for extraction (#19) at the height of contour, occlusal ( top -down) view...planned for extraction(# 19) at the height of contour, occlusal ( top -down) view. Figure 6: Cast after removing the tooth planned for extraction (#19...Subjects will be stratified by location of the tooth in the mouth (i.e. maxillary anterior, maxillary posterior, mandibular anterior or mandibular

  18. Locked Mouths: Tooth Loss in a Women’s Prison in Northeastern Brazil

    Iris Sant’ Anna Araújo Rodrigues

    2014-01-01

    Full Text Available Background. Prisoners, in general, exhibit unsatisfactory oral conditions, especially with regard to the large number of missing teeth and with untreated caries. The aim of this study was to assess tooth loss, use of and need for prosthetic rehabilitation, and use of dental services among inmates. A cross-sectional study involving 65 inmates was developed at the Regional Women’s Prison of Campina Grande, Brazil. Data regarding sociodemographic and sentencing profile, use of dental services, dental morbidity, and self-perceived oral health impacts were investigated. Chi-square, Pearson, and Kruskal-Wallis (P<0.05 statistical tests were used. The mean tooth loss was 11.3 teeth. Significant association between tooth loss and oral health satisfaction (P=0.049, self-perceived need for dental prosthesis (P<0.001, uncomfortable teeth brushing (P=0.005, difficult speaking (P=0.002, and difficulty in performing routine tasks (P=0.025 was observed. It was observed that 29.2% of inmates were using some type of prosthesis, all deemed unsuitable for use, and 78.5% of inmates needed prosthetic rehabilitation. The oral health condition of the population studied was found to be poor, and prisoners showed significant tooth loss and need for dentures, with the aggravation of having tooth extraction as the major reason for seeking dental care.

  19. The Multidisciplinary Management of Fused Maxillary Lateral Incisor with a Supernumerary Tooth in Cleft Lip Adolescence

    Ahmet Yagci

    2014-01-01

    Full Text Available Fusion, an uncommon anomaly of the hard dental tissues, is potentially the cause of clinical problems related to esthetics, tooth spacing, and other periodontal complications. This paper describes a multidisciplinary approach involving surgical, endodontic, restorative, and orthodontic attention for the successful, functional, and esthetic rehabilitation of a maxillary left lateral incisor fused with a supernumerary tooth in unilateral cleft lip adolescence in contralateral side. After clinical and radiographic examinations, a fusion between the left maxillary lateral incisor and a supernumerary tooth was diagnosed in the patient, and a small connection was detected between the pulp systems of the two root canals. The case reported in this paper presents the successful resolution of a fused maxillary lateral incisor with a supernumerary tooth, using endodontic, surgical, restorative, and orthodontic management. The decision made in extracting or retaining the fused tooth depends on the arch discrepancy and esthetic needs. Future studies, with long-term followup, will be helpful in evaluating the long-term efficacy of the different treatment options.

  20. Clinical analysis of mandibular wisdom tooth extraction turbine contra-angle high-speed dental drill Topping law impacted%反角高速涡轮牙钻截冠法拔除下颌阻生智齿临床分析

    李继东

    2016-01-01

    目的:探讨反角高速涡轮牙钻截冠法拔除下颌阻生智齿的临床效果。方法选取我院2014年2月至2016年1月收治的下颌阻生智齿患者60例,随机分为两组,各30例。对照组给予传统锤凿劈冠法拔除,观察组给予反角高速涡轮牙钻截冠法拔除,对比两组疗效。结果观察组手术时间短于对照组,差异显著(P<0.05);观察组术后疼痛、术后颌面部肿胀、术后张口受限程度轻于对照组,差异显著(P<0.05);观察组干槽症发生率低于对照组,差异显著(P<0.05)。结论反角高速涡轮牙钻截冠法拔除下颌阻生智齿可明显缩短手术时间,减轻术后疼痛,降低术后颌面部肿胀、术后张口受限及干槽症发生率。%Objective To investigate the anti-high-speed turbine dental drill angle Topping impacted wisdom tooth removal method of clinical effect. Methods In our hospital from February 2014 to January 2016 were treated 60 cases of mandibular impacted wisdom teeth were randomly divided into two groups, 30 cases each. The control group received the traditional hammer and chisel chop crown removal method, observation group was given the anti-high-speed turbine dental drill angle cut crown removal method, compared to the two groups. Results The operative time was shorter than the control group, the difference was significant (P<0.05); the observation group postoperative pain, swelling and maxillofacial surgery, postoperative trismus degree lighter than the control group, the difference was significant (P<0.05);observation group, the incidence of dry socket than the control group, the difference was significant (P<0.05). Conclusion Anti-corner speed turbine dental drill Topping impacted wisdom tooth extraction method can significantly shorten the operation time, less postoperative pain, reduce swelling and maxillofacial surgery, postoperative trismus and incidence of dry socket.

  1. Tooth regeneration from newly established cell lines from a molar tooth germ epithelium.

    Komine, Akihiko; Suenaga, Momoko; Nakao, Kazuhisa; Tsuji, Takashi; Tomooka, Yasuhiro

    2007-04-13

    In order to investigate tooth development, several cell lines of the dental epithelium and ectomesenchyme have been established. However, no attempt has been reported to regenerate teeth with cell lines. Here, we have established several clonal cell lines of the dental epithelium from a p53-deficient fetal mouse. They expressed specific markers of the dental epithelium such as ameloblastin and amelogenin. A new method has been developed to bioengineer tooth germs with dental epithelial and mesenchymal cells. Reconstructed tooth germs with cell lines and fetal mesenchymal cells were implanted under kidney capsule. The germs regenerated teeth with well-calcified structures as seen in natural tooth. Germs without the cell lines developed bone. This is the first success to regenerate teeth with dental epithelial cell lines. They are useful models in vitro for investigation of mechanisms in morphogenesis and of cell lineage in differentiation, and for clinical application for tooth regeneration.

  2. Hydroxyapatite coating on damaged tooth surfaces by immersion

    Lim, Byoung-Ki; Ryu, Su-Chak [Department of Nanomaterials Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Miryang, 607-706 (Korea, Republic of); Sun, Fangfang; Koh, Kwangnak; Han, Dong-Wook; Lee, Jaebeom, E-mail: jaebeom@pusan.ac.k [Department of Nanomedical Engineering, College of Nanoscience and Nanotechnology, Pusan National University, Miryang, 607-706 (Korea, Republic of)

    2009-04-15

    Hydroxyapatite (HAp) was coated on scratched areas of a human tooth and HAp disks by the immersion method in a HAp colloidal solution (<=20{mu}m of average diameter dispersed in DI water). The surface morphologies of the scratched area after immersion for 1-3 months were investigated showing that the damaged surfaces were remarkably recovered. Then, the mechanical property and chemical stability of the HAp coating layers on both specimens were determined via the Vickers hardness test and concentration measurement of extracted Ca{sup 2+} ions, respectively, after strong acidic treatment. The cellular behavior of mouse calvaria-derived pre-osteoblastic cells (MC3T3-E1) was also examined on the HAp layers regenerated on micro-scratched HAp disks for the purpose of their potential applications on maxillofacial bone conservation and reconstruction for prosthetic dentistry, and artificial disk preparation of a vertebral column. The notable loss of Ca{sup 2+} ions under a highly acidic condition was not observed in the layers coated by HAp adsorption, indicating that the coating surface was well adhered with the original surfaces of the respective specimen. Moreover, the HAp adsorption did not adversely affect the adhesion, growth and proliferation of MC3T3-E1 cells on the coated HAp layers for up to 21 days. These results suggest that the HAp coating on the scratched areas of the tooth would be effectively applicable for the development of long-term prevention of micro-cleavage and tooth health supporters to reduce discoloration and further maxillofacial and orthopedic applications.

  3. Tooth extraction in orthodontics: an evaluation of diagnostic elements

    Antônio Carlos de Oliveira Ruellas; Ricardo Martins de Oliveira Ruellas; Fábio Lourenço Romano; Matheus Melo Pithon; Rogério Lacerda dos Santos

    2010-01-01

    Algumas más oclusões exigem do ortodontista capacidade de diagnóstico para decidir pela melhor maneira de tratar o paciente. O objetivo dos autores deste artigo foi apresentar casos clínicos e discutir alguns elementos de diagnóstico utilizados na elaboração do plano de tratamento, auxiliando na decisão de extrair dentes. Foi dada ênfase em cada elemento de diagnóstico: aspectos relacionados à cooperação, discrepância de modelo, discrepância cefalométrica e perfil facial, idade esquelética (c...

  4. Controlled Deposition of HAp Mimicking Tooth Enamel

    2005-01-01

    Chemical compositions and microsturcture of mature human tooth enamel were investigated by XRD , FTIR and SEM to further understand the characteristics of tooth enamel. In order to obtain apatite crystals chemically and structurally similar to those in tooth enamel, biomimetic way was employed. Selfassembled monolyers terminated with-SO3 H groups were used as deposition substrates and 1.5 SBF ( the concentrations of Ca2+ and PO43- ions 1.5 times than those in simulated body fluid ) with and without 5 ppm F- were used as soaking medium. The XRD and FTIR results showed that both the deposited fluoride-substituted hydroxyapatite( F-HAp ) crystals in 1.5 SBF with F- and hydroxyapatite ( HAp ) crystals in 1.5 SBF were carbonate-containing, mimicking human tooth enamel in chemical compositions. The SEM photos showed that needle-like F-HAp crystals bad large aspect ratios and grew in bundles, which were similar to the crystals in human tooth enamel.The results provide available information on dental restoration.

  5. Detecting Tooth Damage in Geared Drive Trains

    Nachtsheim, Philip R.

    1997-01-01

    This paper describes a method that was developed to detect gear tooth damage that does not require a priori knowledge of the frequency characteristic of the fault. The basic idea of the method is that a few damaged teeth will cause transient load fluctuations unlike the normal tooth load fluctuations. The method attempts to measure the energy in the lower side bands of the modulated signal caused by the transient load fluctuations. The method monitors the energy in the frequency interval which excludes the frequency of the lowest dominant normal tooth load fluctuation and all frequencies above it. The method reacted significantly to the tooth fracture damage results documented in the Lewis data sets which were obtained from tests of the OH-58A transmission and tests of high contact ratio spiral bevel gears. The method detected gear tooth fractures in all four of the high contact ratio spiral bevel gear runs. Published results indicate other detection methods were only able to detect faults for three out of four runs.

  6. The evolution of dinosaur tooth enamel microstructure.

    Hwang, Sunny H

    2011-02-01

    The evolution of tooth enamel microstructure in both extinct and extant mammalian groups has been extensively documented, but is poorly known in reptiles, including dinosaurs. Previous intensive sampling of dinosaur tooth enamel microstructure revealed that: (1) the three-dimensional arrangement of enamel types and features within a tooth-the schmelzmuster-is most useful in diagnosing dinosaur clades at or around the family level; (2) enamel microstructure complexity is correlated with tooth morphology complexity and not necessarily with phylogenetic position; and (3) there is a large amount of homoplasy within Theropoda but much less within Ornithischia. In this study, the examination of the enamel microstructure of 28 additional dinosaur taxa fills in taxonomic gaps of previous studies and reinforces the aforementioned conclusions. Additionally, these new specimens reveal that within clades such as Sauropodomorpha, Neotheropoda, and Euornithopoda, the more basal taxa have simpler enamel that is a precursor to the more complex enamel of more derived taxa and that schmelzmusters evolve in a stepwise fashion. In the particularly well-sampled clade of Euornithopoda, correlations between the evolution of dental and enamel characters could be drawn. The ancestral schmelzmuster for Genasauria remains ambiguous due to the dearth of basal ornithischian teeth available for study. These new specimens provide new insights into the evolution of tooth enamel microstructure in dinosaurs, emphasizing the importance of thorough sampling within broadly inclusive clades, especially among their more basal members.

  7. Anatomically shaped tooth and periodontal regeneration by cell homing.

    Kim, K; Lee, C H; Kim, B K; Mao, J J

    2010-08-01

    Tooth regeneration by cell delivery encounters translational hurdles. We hypothesized that anatomically correct teeth can regenerate in scaffolds without cell transplantation. Novel, anatomically shaped human molar scaffolds and rat incisor scaffolds were fabricated by 3D bioprinting from a hybrid of poly-epsilon-caprolactone and hydroxyapatite with 200-microm-diameter interconnecting microchannels. In each of 22 rats, an incisor scaffold was implanted orthotopically following mandibular incisor extraction, whereas a human molar scaffold was implanted ectopically into the dorsum. Stromal-derived factor-1 (SDF1) and bone morphogenetic protein-7 (BMP7) were delivered in scaffold microchannels. After 9 weeks, a putative periodontal ligament and new bone regenerated at the interface of rat incisor scaffold with native alveolar bone. SDF1 and BMP7 delivery not only recruited significantly more endogenous cells, but also elaborated greater angiogenesis than growth-factor-free control scaffolds. Regeneration of tooth-like structures and periodontal integration by cell homing provide an alternative to cell delivery, and may accelerate clinical applications.

  8. Acoustic emission analysis of tooth-composite interfacial debonding.

    Cho, N Y; Ferracane, J L; Lee, I B

    2013-01-01

    This study detected tooth-composite interfacial debonding during composite restoration by means of acoustic emission (AE) analysis and investigated the effects of composite properties and adhesives on AE characteristics. The polymerization shrinkage, peak shrinkage rate, flexural modulus, and shrinkage stress of a methacrylate-based universal hybrid, a flowable, and a silorane-based composite were measured. Class I cavities on 49 extracted premolars were restored with 1 of the 3 composites and 1 of the following adhesives: 2 etch-and-rinse adhesives, 2 self-etch adhesives, and an adhesive for the silorane-based composite. AE analysis was done for 2,000 sec during light-curing. The silorane-based composite exhibited the lowest shrinkage (rate), the longest time to peak shrinkage rate, the lowest shrinkage stress, and the fewest AE events. AE events were detected immediately after the beginning of light-curing in most composite-adhesive combinations, but not until 40 sec after light-curing began for the silorane-based composite. AE events were concentrated at the initial stage of curing in self-etch adhesives compared with etch-and-rinse adhesives. Reducing the shrinkage (rate) of composites resulted in reduced shrinkage stress and less debonding, as evidenced by fewer AE events. AE is an effective technique for monitoring, in real time, the debonding kinetics at the tooth-composite interface.

  9. Whole Tooth Regeneration as a Future Dental Treatment.

    Oshima, Masamitsu; Tsuji, Takashi

    2015-01-01

    Dental problems caused by dental caries, periodontal disease and tooth injury compromise the oral and general health issues. Current advances for the development of regenerative therapy have been influenced by our understanding of embryonic development, stem cell biology, and tissue engineering technology. Tooth regenerative therapy for tooth tissue repair and whole tooth replacement is currently expected a novel therapeutic concept with the full recovery of tooth physiological functions. Dental stem cells and cell-activating cytokines are thought to be candidate approach for tooth tissue regeneration because they have the potential to differentiate into tooth tissues in vitro and in vivo. Whole tooth replacement therapy is considered to be an attractive concept for next generation regenerative therapy as a form of bioengineered organ replacement. For realization of whole tooth regeneration, we have developed a novel three-dimensional cell manipulation method designated the "organ germ method". This method involves compartmentalisation of epithelial and mesenchymal cells at a high cell density to mimic multicellular assembly conditions and epithelial-mesenchymal interactions in organogenesis. The bioengineered tooth germ generates a structurally correct tooth in vitro, and erupted successfully with correct tooth structure when transplanted into the oral cavity. We have ectopically generated a bioengineered tooth unit composed of a mature tooth, periodontal ligament and alveolar bone, and that tooth unit was engrafted into an adult jawbone through bone integration. Bioengineered teeth were also able to perform physiological tooth functions such as mastication, periodontal ligament function and response to noxious stimuli. In this review, we describe recent findings and technologies underpinning whole tooth regenerative therapy.

  10. Effect of drugs on orthodontic tooth movement

    Siti Sarah Aulia Amrullah

    2016-06-01

    Full Text Available Orthodontic tooth movement is basically a biological response to mechanical forces given to the teeth in orthodontic treatment, which involving the periodontal tissue and alveolar bone, resulting in the release of numerous substances from the dental tissues and surrounding structure. Remodeling changes in periodontal tissues are considered to be essential in effecting orthodontic tooth movement which is the base of orthodontic correction. Molecules produced in various diseased tissues or drugs and nutrients consumed regularly by patients, can influence mechanically stressed periodontal tissue through the circulation and interact with target cell combination of which may be inhibitory, additive or synergize. Medications might have an important influence on the rate of tooth movement, and information on their consumption is essential to adequately discuss treatment planning with patients. Therefore it is imperative to the practitioners being in medical profession, must pay close attention to the drug consumption history of every patient before and during the course of treatment.

  11. Ectopic tooth in maxillary sinus: Case series.

    Ramanojam, Shandilya; Halli, Rajshekhar; Hebbale, Manjula; Bhardwaj, Smita

    2013-01-01

    Ectopic eruption of a tooth within the dentate region of the jaws is often noticed in clinical practice and is well documented in the literature. But the ectopic eruption into the non dentate region is rare and scantly documented. The maxillary sinus is one such a non dentate region, apart from nasal septum, mandibular condyle, coronoid process and the palate, to accommodate such ectopic eruptions of teeth. Due to its rarity and lack of consensus over its management, the incidence deserves to be added to the literature and discussed. Early surgical intervention for removal of ectopic tooth along with enucleation of the associated cyst, if any, is the treatment of choice.

  12. [Ectopic molar tooth in the maxillary sinus].

    Altun, Hüseyin; Teker, Ayşenur Meriç; Ceran, Murat; Gedikli, Orhan

    2007-01-01

    The development of intranasal ectopic teeth is rare. Although they are more commonly seen in the palate and maxillary sinus, they can also be found in the mandibular condyle, coronoid process, and nasal cavity. A 30-year-old male patient presented with a complaint of headache. Computed tomography of the paranasal sinuses showed a bony mass in the right maxillary sinus wall, 1 cm in size. He did not have any history of maxillofacial trauma or operation. The mass was removed via a Caldwell-Luc procedure. It looked like a tooth. Histopathologic diagnosis was made as ectopic molar tooth. The patient was asymptomatic two weeks after the operation.

  13. 21 CFR 872.3200 - Resin tooth bonding agent.

    2010-04-01

    .... A resin tooth bonding agent is a device material, such as methylmethacrylate, intended to be painted on the interior of a prepared cavity of a tooth to improve retention of a restoration, such as...

  14. 3D analysis of craniofacial growth and tooth eruption

    Kreiborg, Sven

    The 9th International Congress on Cleft Palate and Related Craniofacial Anomalies, 3D analysis, craniofacial growth, tooth eruption......The 9th International Congress on Cleft Palate and Related Craniofacial Anomalies, 3D analysis, craniofacial growth, tooth eruption...

  15. Decoronation of an ankylosed tooth for preservation of alveolar bone prior to implant placement.

    Filippi, A; Pohl, Y; von Arx, T

    2001-04-01

    A 12-year-old patient sustained avulsions of both permanent maxillary central incisors. Subsequently, both teeth developed replacement resorption. The left incisor was extracted alio loco. The right incisor was treated by decoronation (removal of crown and pulp, but preservation of the root substance). Comparison of both sites demonstrated complete preservation of the height and width of the alveolar bone at the decoronation site, whereas the tooth extraction site showed considerable bone loss. In addition, some vertical bone apposition was found on top of the decoronated root. Decoronation is a simple and safe surgical procedure for preservation of alveolar bone prior to implant placement. It must be considered as a treatment option for teeth affected by replacement resorption if tooth transplantation is not feasible.

  16. Functional Properties of Tooth Pulp Neurons Responding to Thermal Stimulation

    Ahn, D.K.; Doutova, E.A.; McNaughton, K.; Light, A.R.; Närhi, M.; Maixner, W.

    2012-01-01

    The response properties of tooth pulp neurons that respond to noxious thermal stimulation of the dental pulp have been not well-studied. The present study was designed to characterize the response properties of tooth pulp neurons to noxious thermal stimulation of the dental pulp. Experiments were conducted on 25 male ferrets, and heat stimulation was applied by a computer-controlled thermode. Only 15% of tooth pulp neurons (n = 39) responded to noxious thermal stimulation of the teeth. Tooth ...

  17. A panorama of tooth wear during the medieval period.

    Esclassan, Rémi; Hadjouis, Djillali; Donat, Richard; Passarrius, Olivier; Maret, Delphine; Vaysse, Frédéric; Crubézy, Eric

    2015-01-01

    Tooth wear is a natural phenomenon and a universal occurrence that has existed from the origin of humankind and depends on the way of life, especially diet. Tooth wear was very serious in ancient populations up to the medieval period. The aim of this paper is to present a global view of tooth wear in medieval times in Europe through different parameters: scoring systems, quantity and direction of wear, gender, differences between maxilla and mandible, relations with diet, caries, tooth malpositions and age.

  18. Pulpal inflammation after vital tooth bleaching with 38% hydrogen peroxide

    Ardiny Andriani

    2012-06-01

    Full Text Available Background: In-office vital tooth bleaching is a treatment to remove tooth stains. Tooth sensitivity is one of side effect commonly complained by patients receiving this treatment. Purpose: The aim of this study was to examine histological inflammatory cells infiltration of dental pulp after application of 38% H2O2 as a vital tooth bleaching agent. Methods: Under informed consent, a total of 15 premolars from 8 healthy subjects scheduled for orthodontic extraction were used in this study. Thirty eight percent H2O2 was applied on the buccal surface of the treated group. The treated teeth were extracted after 1 hour, 5, 8, and 15 days. All specimens were embedded in paraffin wax, sectioned serially and stained with Hematoxyllin Eosin. Histological specimens were then observed under a light microscope. Results: All treated groups showed a slight disorganization of odontoblasts layer and slight inflammation in the pulp tissue adjacent to the 38% H2O2 application site. The number of polymorphonuclear leukocytes (PMN had increased significantly 1 hour after application of 38% H2O2 (p<0.05, while macrophages had significantly increased 5 days after the application (p<0.05. The most intense PMN and macrophages infiltration was found 5 days after the application and gradually decreased 8 days after application of38% H2O2. Conclusion: Application of 38% H2O2 as a vital tooth bleaching agent induces acute inflammation in human dental pulp; however, the inflammation will decrease 8 days after the application.Latar belakang: Perawatan pemutihan gigi vital metode in-office merupakan tindakan untuk menghilangkan pewarnaan pada gigi. Salah satu efek samping yang sering dikeluhkan oleh pasien yang menjalani perawatan ini adalah sensitivitas gigi. Tujuan: Penelitian ini bertujuan untuk mengamati infiltrasi sel inflamasi pada pulpa gigi setelah aplikasi H2O2 38% sebagai bahan pemutih gigi. Metode: Sampel penelitian ini berupa 15 gigi premolar yang berasal dari 8

  19. The Importance of Tooth Decay Prevention in Children under Three

    Milgrom, Peter; Huebner, Colleen; Chi, Donald

    2010-01-01

    Tooth decay and tooth loss was once the norm but public health interventions have led to major improvements for most people. Nevertheless, not all children have benefited. Dental disease in young children is unacceptably high. Tooth decay is preventable. Early childhood educators are often the first to notice the problem. Professional…

  20. Tooth-marked small theropod bone: an extremely rare trace

    Jacobsen, Aase Roland

    2001-01-01

    Tooth-marked dinosaur bones provide insight into feeding behaviours and biting strategies of theropod dinosaurs. The majority of theropod tooth marks reported to date have been found on herbivorous dinosaur bones, although some tyrannosaurid bones with tooth marks have also been reported. In 1988...

  1. 21 CFR 872.3690 - Tooth shade resin material.

    2010-04-01

    ...) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3690 Tooth shade resin material. (a) Identification. Tooth shade resin material is a device composed of materials such as bisphenol-A glycidyl... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Tooth shade resin material. 872.3690 Section...

  2. An inductive signalling network regulates mammalian tooth morphogenesis with implications for tooth regeneration.

    Li, Z; Yu, M; Tian, W

    2013-10-01

    Sequential and reciprocal epithelial-mesenchymal interactions, essential throughout such aspects of tooth morphogenesis as patterning, size and number of teeth, involves a well-ordered series of inductive and permissive signals that exert global control over cell proliferation, differentiation and organogenesis. In particular, growth factors, transcription factors and their corresponding receptors, as well as other soluble morphogens, make up a regulatory network at the molecular level that synergistically or antagonistically controls intra-/inter-cellular signal transduction during odontogenesis. This review summarizes recent advances in the study of crucial signalling pathways, for example of BMPs, Wnt, Notch, Shh and FGF, with emphasis on the potential integrated signalling network responsible for tooth formation. Our work probes into the complexity of these inductive signalling pathways to promote the understanding of tooth regeneration. Additionally, our study provides further insights into therapeutic strategies for various dental abnormalities in patterning and number, such as tooth agenesis and supernumerary teeth.

  3. Computed tomography to quantify tooth abrasion

    Kofmehl, Lukas; Schulz, Georg; Deyhle, Hans; Filippi, Andreas; Hotz, Gerhard; Berndt-Dagassan, Dorothea; Kramis, Simon; Beckmann, Felix; Müller, Bert

    2010-09-01

    Cone-beam computed tomography, also termed digital volume tomography, has become a standard technique in dentistry, allowing for fast 3D jaw imaging including denture at moderate spatial resolution. More detailed X-ray images of restricted volumes for post-mortem studies in dental anthropology are obtained by means of micro computed tomography. The present study evaluates the impact of the pipe smoking wear on teeth morphology comparing the abraded tooth with its contra-lateral counterpart. A set of 60 teeth, loose or anchored in the jaw, from 12 dentitions have been analyzed. After the two contra-lateral teeth were scanned, one dataset has been mirrored before the two datasets were registered using affine and rigid registration algorithms. Rigid registration provides three translational and three rotational parameters to maximize the overlap of two rigid bodies. For the affine registration, three scaling factors are incorporated. Within the present investigation, affine and rigid registrations yield comparable values. The restriction to the six parameters of the rigid registration is not a limitation. The differences in size and shape between the tooth and its contra-lateral counterpart generally exhibit only a few percent in the non-abraded volume, validating that the contralateral tooth is a reasonable approximation to quantify, for example, the volume loss as the result of long-term clay pipe smoking. Therefore, this approach allows quantifying the impact of the pipe abrasion on the internal tooth morphology including root canal, dentin, and enamel volumes.

  4. Life of a Tooth: A Visual Timeline

    Full Text Available ... friv Home InfoBites Find an AGD Dentist Your Family's Oral Health About the AGD Dental care and ... Tooth games Home | InfoBites | Find a Dentist | Your Family's Oral Health | Newsroom | RSS About AGD | Contact AGD | ...

  5. Restoration of the endodontically treated posterior tooth

    Andrea Polesel

    2014-06-01

    Results and conclusions: Direct adhesive restorations, indirect bonded restorations and traditional full crown are three therapeutic options for the single posterior endodontically treated teeth. The amount of remaining sound tooth structure is the most significant factor influencing the therapeutic approach. The clinician's operative skill is a determining aspect for long-term success of adhesive inlays.

  6. Early Onset Charcot-Marie-Tooth Disease

    J Gordon Millichap

    2005-06-01

    Full Text Available The clinical signs and genetic analysis of early-onset Charcot-Marie-Tooth disease (CMT in a 2-year-old boy and members of his family are reported from the Academic Medical Center, Amsterdam, and Sophia Children’s Hospital, Rotterdam, the Netherlands.

  7. Bleaching of the discolored traumatized tooth

    Dahl, Jon E.; Kopperud, Siemen E.; Pallesen, Ulla

    2017-01-01

    This chapter focuses on the treatment of discolored traumatized teeth, most of them being non-vital and subsequently, endodontically treated. Tooth bleaching based upon hydrogen peroxide as the active agent, applied directly or produced in a chemical reaction from sodium perborate or carbamide pe...... retreatment....

  8. EPR dosimetry with tooth enamel: A review.

    Fattibene, Paola; Callens, Freddy

    2010-11-01

    When tooth enamel is exposed to ionizing radiation, radicals are formed, which can be detected using electron paramagnetic resonance (EPR) techniques. EPR dosimetry using tooth enamel is based on the (presumed) correlation between the intensity or amplitude of some of the radiation-induced signals with the dose absorbed in the enamel. In the present paper a critical review is given of this widely applied dosimetric method. The first part of the paper is fairly fundamental and deals with the main properties of tooth enamel and some of its model systems (e.g., synthetic apatites). Considerable attention is also paid to the numerous radiation-induced and native EPR signals and the radicals responsible for them. The relevant methods for EPR detection, identification and spectrum analyzing are reviewed from a general point of view. Finally, the needs for solid-state modelling and studies of the linearity of the dose response are investigated. The second part is devoted to the practical implementation of EPR dosimetry using enamel. It concerns specific problems of preparation of samples, their irradiation and spectrum acquisition. It also describes how the dosimetric signal intensity and dose can be retrieved from the EPR spectra. Special attention is paid to the energy dependence of the EPR response and to sources of uncertainties. Results of and problems encountered in international intercomparisons and epidemiological studies are also dealt with. In the final section the future of EPR dosimetry with tooth enamel is analyzed.

  9. EPR dosimetry with tooth enamel: A review

    Fattibene, Paola, E-mail: paola.fattibene@iss.i [Istituto Superiore di Sanita, Department of Technology and Health, Viale Regina Elena 299, I-00161 Rome (Italy); Callens, Freddy, E-mail: freddy.callens@ugent.b [Ghent University, Department of Solid State Sciences, Krijgslaan 281-S1, B-9000 Gent (Belgium)

    2010-11-15

    When tooth enamel is exposed to ionizing radiation, radicals are formed, which can be detected using electron paramagnetic resonance (EPR) techniques. EPR dosimetry using tooth enamel is based on the (presumed) correlation between the intensity or amplitude of some of the radiation-induced signals with the dose absorbed in the enamel. In the present paper a critical review is given of this widely applied dosimetric method. The first part of the paper is fairly fundamental and deals with the main properties of tooth enamel and some of its model systems (e.g., synthetic apatites). Considerable attention is also paid to the numerous radiation-induced and native EPR signals and the radicals responsible for them. The relevant methods for EPR detection, identification and spectrum analyzing are reviewed from a general point of view. Finally, the needs for solid-state modelling and studies of the linearity of the dose response are investigated. The second part is devoted to the practical implementation of EPR dosimetry using enamel. It concerns specific problems of preparation of samples, their irradiation and spectrum acquisition. It also describes how the dosimetric signal intensity and dose can be retrieved from the EPR spectra. Special attention is paid to the energy dependence of the EPR response and to sources of uncertainties. Results of and problems encountered in international intercomparisons and epidemiological studies are also dealt with. In the final section the future of EPR dosimetry with tooth enamel is analyzed.

  10. Regenerative Applications Using Tooth Derived Stem Cells in Other Than Tooth Regeneration: A Literature Review

    2016-01-01

    Tooth derived stem cells or dental stem cells are categorized according to the location from which they are isolated and represent a promising source of cells for regenerative medicine. Originally, as one kind of mesenchymal stem cells, they are considered an alternative of bone marrow stromal cells. They share many commonalties but maintain differences. Considering their original function in development and the homeostasis of tooth structures, many applications of these cells in dentistry ha...

  11. Exceptionally prolonged tooth formation in elasmosaurid plesiosaurians

    Kear, Benjamin P.; Larsson, Dennis; Lindgren, Johan; Kundrát, Martin

    2017-01-01

    Elasmosaurid plesiosaurians were globally prolific marine reptiles that dominated the Mesozoic seas for over 70 million years. Their iconic body-plan incorporated an exceedingly long neck and small skull equipped with prominent intermeshing ‘fangs’. How this bizarre dental apparatus was employed in feeding is uncertain, but fossilized gut contents indicate a diverse diet of small pelagic vertebrates, cephalopods and epifaunal benthos. Here we report the first plesiosaurian tooth formation rates as a mechanism for servicing the functional dentition. Multiple dentine thin sections were taken through isolated elasmosaurid teeth from the Upper Cretaceous of Sweden. These specimens revealed an average of 950 daily incremental lines of von Ebner, and infer a remarkably protracted tooth formation cycle of about 2–3 years–other polyphyodont amniotes normally take ~1–2 years to form their teeth. Such delayed odontogenesis might reflect differences in crown length and function within an originally uneven tooth array. Indeed, slower replacement periodicity has been found to distinguish larger caniniform teeth in macrophagous pliosaurid plesiosaurians. However, the archetypal sauropterygian dental replacement system likely also imposed constraints via segregation of the developing tooth germs within discrete bony crypts; these partly resorbed to allow maturation of the replacement teeth within the primary alveoli after displacement of the functional crowns. Prolonged dental formation has otherwise been linked to tooth robustness and adaption for vigorous food processing. Conversely, elasmosaurids possessed narrow crowns with an elongate profile that denotes structural fragility. Their apparent predilection for easily subdued prey could thus have minimized this potential for damage, and was perhaps coupled with selective feeding strategies that ecologically optimized elasmosaurids towards more delicate middle trophic level aquatic predation. PMID:28241059

  12. Developing a biomimetic tooth bud model.

    Smith, Elizabeth E; Zhang, Weibo; Schiele, Nathan R; Khademhosseini, Ali; Kuo, Catherine K; Yelick, Pamela C

    2017-01-08

    A long-term goal is to bioengineer, fully functional, living teeth for regenerative medicine and dentistry applications. Biologically based replacement teeth would avoid insufficiencies of the currently used dental implants. Using natural tooth development as a guide, a model was fabricated using post-natal porcine dental epithelial (pDE), porcine dental mesenchymal (pDM) progenitor cells, and human umbilical vein endothelial cells (HUVEC) encapsulated within gelatin methacrylate (GelMA) hydrogels. Previous publications have shown that post-natal DE and DM cells seeded onto synthetic scaffolds exhibited mineralized tooth crowns composed of dentin and enamel. However, these tooth structures were small and formed within the pores of the scaffolds. The present study shows that dental cell-encapsulated GelMA constructs can support mineralized dental tissue formation of predictable size and shape. Individually encapsulated pDE or pDM cell GelMA constructs were analysed to identify formulas that supported pDE and pDM cell attachment, spreading, metabolic activity, and neo-vasculature formation with co-seeded endothelial cells (HUVECs). GelMa constructs consisting of pDE-HUVECS in 3% GelMA and pDM-HUVECs within 5% GelMA supported dental cell differentiation and vascular mineralized dental tissue formation in vivo. These studies are the first to demonstrate the use of GelMA hydrogels to support the formation of post-natal dental progenitor cell-derived mineralized and functionally vascularized tissues of specified size and shape. These results introduce a novel three-dimensional biomimetic tooth bud model for eventual bioengineered tooth replacement teeth in humans. Copyright © 2017 John Wiley & Sons, Ltd.

  13. Analysis of the soluble human tooth proteome and its ability to induce dentin/tooth regeneration.

    Chun, So Young; Lee, Hyo Jung; Choi, Young Ae; Kim, Kyung Min; Baek, Sang Heum; Park, Hyo Sang; Kim, Jae-Young; Ahn, Jung-Mo; Cho, Je-Yeol; Cho, Dong-Woo; Shin, Hong-In; Park, Eui Kyun

    2011-01-01

    While the soluble proteins of human teeth consist of various extracellular matrix and bioactive proteins, they have not yet been characterized fully. Moreover, the role they play in tooth regeneration is not clear. Analysis of the soluble proteins in human teeth by liquid chromatography-mass spectrometry revealed 147 different ethylenediaminetetraacetic acid-soluble tooth proteins (ESTPs). Of these, 29 had not been shown previously to be present in human teeth. To determine their effect on the in vitro responses of dental pulp stem cells (DPSCs), DPSCs were cultured in ESTP-coated culture plates and three-dimensional scaffolds. The ESTPs significantly enhanced DPSC odontoblast differentiation and mineralization in vitro, but had only partial effect on bone marrow stem cells or adipose tissue stem cells. To test the effect of ESTPs on in vivo dentin and tooth formation, mouse embryonic tooth-forming primordia and xenogenic murine apical bud epithelium/human DPSC composites were treated with ESTPs before implantation under the renal capsule of ICR mice. ESTP treatment promoted the formation of morphologically normal teeth by the tooth-forming primordium regions and enhanced the development of a regular and large dentin structure by the composites. These observations suggest that human ESTPs contain dentinogenic proteins and can promote dentin and tooth formation.

  14. Is tooth wear in the primary dentition predictive of tooth wear in the permanent dentition? Report from a longitudinal study.

    Harding, M A

    2010-03-01

    To determine the prevalence of tooth wear in the permanent dentition of a sample of 12-year-old school children and establish whether an association exists between tooth wear recorded now and tooth wear recorded in their primary dentition at age five.

  15. A comparison between adipose tissue and dental pulp as sources of MSCs for tooth regeneration.

    Hung, Chia-Nung; Mar, Kwei; Chang, Hao-Chen; Chiang, Yi-Lun; Hu, Huai-Yun; Lai, Chia-Chi; Chu, Rei-Min; Ma, Chang M

    2011-10-01

    In this study, several in vivo and in vitro comparisons were performed to test the possibility of using adipose-derived stem cells (ADSCs), a more convenient cell source than dental pulp stem cells (DPSCs), in tooth regeneration. Using an efficient, non-engineering implantation method, we first demonstrated that both implants of ADSCs and DPSCs were able to grow self-assembled new teeth in adult rabbit extraction sockets with high success rate. The stem cells were necessary because the implants grew no tooth without them. A stepwise comparison showed that the regenerated teeth from these two types of adult stem cells were living with nerves and vascular system and remarkably similar to a normal tooth in many details. Further strictly controlled, side-by-side comparisons between the two types of stem cells also showed that the expression patterns of gene markers and the broad differentiation potentials induced by specific methods in vitro were very similar. Although a few differences were found, they did not affect the tested tooth regeneration in vivo or differentiation in vitro. Furthermore, rabbit ADSCs had a higher growth rate and a better senescence resistance in culture. All these findings suggest that ADSCs, one of the richest adult stem cells in mammals, are very similar and useful as DPSCs for regenerative dentistry.

  16. Tooth regeneration: challenges and opportunities for biomedical material research.

    Du, Chang; Moradian-Oldak, Janet

    2006-03-01

    Tooth regeneration presents many challenges to researchers in the fields of biology, medicine and material science. This review considers the opportunities for biomedical material research to contribute to this multidisciplinary endeavor. We present short summaries and an overview on the collective knowledge of tooth developmental biology, advances in stem-cell research, and progress in the understanding of the tooth biomineralization principles as they provide the foundation for developing strategies for reparative and regenerative medicine. We emphasize that various biomaterials developed via biomimetic strategies have great potential for tooth tissue engineering and regeneration applications. The current practices in tooth tissue engineering approaches and applications of biomimetic carriers or scaffolds are also discussed.

  17. A TOOTH TATTOO WITH A PURPOSE: AN INNOVATIVE APPROACH

    Neetu

    2014-01-01

    Full Text Available Skin is not the only place that can be decorated with a tattoo. You can decorate your tooth with amazing tattoos. Tooth tattoos and tooth jewels have become one of the hottest fashion trends , and a very popular arrival in cosmetic dentistry. But won’t it be a boon if it had some preventive or medicinal v alue. Yes tooth tattoos can act as indicators of once illness. These tiny electronic sensors can diagnose illnesses by 'tasting' your breath. This paper is an insight into how a tooth tattoos can pick up early warning signs of sickness or infection by bact eria in people's breath.

  18. Retrospective biodosimetry with small tooth enamel samples using K-Band and X-Band

    Gomez, Jorge A. [Departamento de Fisica, FFCLRP, Universidade de Sao Paulo, 14040-901 Ribeirao Preto, Sao Paulo (Brazil); Kinoshita, Angela [Departamento de Fisica, FFCLRP, Universidade de Sao Paulo, 14040-901 Ribeirao Preto, Sao Paulo (Brazil); Universidade Sagrado Coracao - USC, 17011-160 Bauru, Sao Paulo (Brazil); Leonor, Sergio J. [Departamento de Fisica, FFCLRP, Universidade de Sao Paulo, 14040-901 Ribeirao Preto, Sao Paulo (Brazil); Belmonte, Gustavo C. [Universidade Sagrado Coracao - USC, 17011-160 Bauru, Sao Paulo (Brazil); Baffa, Oswaldo, E-mail: baffa@usp.br [Departamento de Fisica, FFCLRP, Universidade de Sao Paulo, 14040-901 Ribeirao Preto, Sao Paulo (Brazil)

    2011-09-15

    In an attempt to make the in vitro electron spin resonance (ESR) retrospective dosimetry of the tooth enamel a lesser invasive method, experiments using X-Band and K-Band were performed, aiming to determine conditions that could be used in cases of accidental exposures. First, a small prism from the enamel was removed and ground with an agate mortar and pestle until particles reach a diameter of approximately less than 0.5 mm. This enamel extraction process resulted in lower signal artifact compared with the direct enamel extraction performed with a diamond burr abrasion. The manual grinding of the enamel does not lead to any induced ESR signal artifact, whereas the use of a diamond burr at low speed produces a signal artifact equivalent to the dosimetric signal induced by a dose of 500 mGy of gamma irradiation. A mass of 25 mg of enamel was removed from a sound molar tooth previously irradiated in vitro with a dose of 100 mGy. This amount of enamel was enough to detect the dosimetric signal in a standard X-Band spectrometer. However using a K-Band spectrometer, samples mass between 5 and 10 mg were sufficient to obtain the same sensitivity. An overall evaluation of the uncertainties involved in the process in this and other dosimetric assessments performed at our laboratory indicates that it is possible at K-Band to estimate a 100 mGy dose with 25% accuracy. In addition, the use of K-Band also presented higher sensitivity and allowed the use of smaller sample mass in comparison with X-Band. Finally, the restoration process performed on a tooth after extraction of the 25 mg of enamel is described. This was conducted by dental treatment using photopolymerizable resin which enabled complete recovery of the tooth from the functional and aesthetic viewpoint showing that this procedure can be minimally invasive.

  19. Tooth reorientation affects tooth function during prey processing and tooth ontogeny in the lesser electric ray, Narcine brasiliensis.

    Dean, Mason N; Ramsay, Jason B; Schaefer, Justin T

    2008-01-01

    The dental anatomy of elasmobranch fishes (sharks, rays and relatives) creates a functional system that is more dynamic than that of mammalian dentition. Continuous dental replacement (where new teeth are moved rostrally to replace older ones) and indirect fibrous attachment of the dentition to the jaw allow teeth to reorient relative to the jaw over both long- and short-term scales, respectively. In this study, we examine the processing behavior and dental anatomy of the lesser electric ray Narcine brasiliensis (Olfers, 1831) to illustrate that the freedom of movement of elasmobranch dentition allows a functional flexibility that can be important for complex prey processing behaviors. From static manipulations of dissected jaws and observations of feeding events in live animals, we show that the teeth rotate during jaw protrusion, resulting in a secondary grasping mechanism that likely serves to hold prey while the buccal cavity is flushed free of sediment. The function of teeth is not always readily apparent from morphology; in addition to short-term reorientation, the long-term dental reorientation during replacement allows a given tooth to serve multiple functions during tooth ontogeny. Unlike teeth inside the mouth, the cusps of external teeth (on the portion of the tooth pad that extends past the occlusal plane) lay flat, such that the labial faces act as a functional battering surface, protecting the jaws during prey excavation.

  20. Non-surgical management of tooth hypersensitivity.

    Clark, Danielle; Levin, Liran

    2016-10-01

    Tooth sensitivity is a common complaint of patients in dental practices. Studies have demonstrated dentinal hypersensitivity to affect 10-30% of the population. There are various potential causes of tooth sensitivity and a variety of available treatment options. This narrative review will discuss the possible aetiology of this condition, as well as the treatment modalities available. A tailor-made treatment plan that starts with the most non-invasive treatment options and escalates only when those options have proven insufficient in alleviating symptoms should be provided for each patient. Only after all non- and less-invasive methods have failed to reduce the symptoms should more invasive treatment options, such as root-coverage, be considered.

  1. Tooth in Ethmoid Sinus: A Case Report

    Tayebe Kazemei

    2009-09-01

    Full Text Available Ectopic eruption of teeth occurs in a variety of locations.Commonly seen in palate and maxillary sinus, they have alsobeen reported in nasal cavity, orbit, mandibular condyle,coronoid process, and facial skin.Here, we report a rare case of recurrent sinusitis caused byectopic tooth in right ethmoid sinus and successful endoscopicremoval of it. The symptoms of the patient disappeared aftersurgery. Such case has not been yet reported in the Englishliterature.Ectopic tooth is an uncommon cause of sinusitis. It shouldbe considered in patients presenting with recurrent sinusitis unresponsiveto medical treatment. Computed tomography of thesinuses is the modality of choice for diagnosis. Endoscopic sinussurgery is the best method for management of such cases.

  2. Interdisciplinary management of single-tooth implants.

    Spear, F M; Mathews, D M; Kokich, V G

    1997-03-01

    Orthodontists treat many patients who are missing maxillary lateral incisors and/or mandibular second premolars. In the past, if the canines could not be substituted for lateral incisors, conventional full-coverage bridges were the common restoration. Recently, resin-bonded Maryland bridges became a popular substitute for conventional bridges to avoid crowns on the nonrestored abutments. However, resin-bonded bridges have a poor long-term prognosis for retention, lasting on average about 10 years. Since implants were introduced into dentistry by Swedish researchers in the mid-1980s, they have become a promising substitute for conventional or resin-bonded bridges. However, to successfully place and restore single-tooth implants in young orthodontic patients several questions must be answered. This article will discuss the many interdisciplinary issues that are involved in placing and restoring single-tooth implants in orthodontic patients.

  3. Esthetics and vertical tooth position: orthodontic possibilities.

    Kokich, V G

    1997-12-01

    Throughout the 1990s, esthetic dentistry has become a prominent part of the treatment protocol of most dentists. Patients have become more conscious of the benefits of a beautiful smile and are willing to invest time and money to improve the appearance of their teeth. Many of these patients can be treated with routine restorative procedures (crowns, composites, laminates) to achieve the desired results. However, some patients have problems with tooth position that create significant discrepancies in gingival levels which can compromise the esthetic result of restorative dentistry. Prerestorative orthodontic therapy can often resolve these tooth position problems and enhance the esthetic restoration. This article describes the indication, methods, and results achieved when orthodontics preceded restorative dentistry in the treatment of various esthetic challenges.

  4. Tooth structure and fracture strength of cavities

    Mondelli, José; Sene, Fábio; Ramos, Renata Pereira

    2007-01-01

    This study evaluated, in vitro, the loss of tooth substance after cavity preparation for direct and indirect restorations and its relationship with fracture strength of the prepared teeth. Sixty sound human maxillary first premolars were assigned to 6 groups (n=10). MOD direct composite cavities......) or 1/2 (Groups III and VI) of the intercuspal distance. Teeth were weighed (digital balance accurate to 0.001 g) before and after preparation to record tooth substance mass lost during cavity preparation. The prepared teeth were submitted to occlusal loading to determine their fracture strength using...... mass loss (13.91%) than composite resin preparations with the same width (10.02%). 1/2-inlay cavities had 21.34% of mass loss versus 16.19% for the 1/2-composite resin cavities. Fracture strength means (in kgf) were: GI = 187.65; GII = 143.62; GIII = 74.10; GIV = 164.22; GV = 101.92; GVI = 50...

  5. Study on bone regeneration with two different ratios of nano-hydroxyapatite and collagen grafts after tooth extraction in dogs%两种配比纳米羟基磷灰石复合胶原材料对犬拔牙窝骨缺损修复效果的比较

    王彦夫; 王程越; 王绍刚; 崔福斋

    2016-01-01

    Objective To compare the effect of bone regeneration with two different ratios of nano-hydroxyapatite(nHA)/collagen(Col)(nHAC) after tooth extraction in canine.Methods Two kinds of nHAC grafts were prepared with different nHA/collagen ratio of 3 ∶ 7 and 5 ∶ 5.Eighteen male healthy adult dogs had been randomly divided into three groups.Immediately after extraction of the mandibular second premolars,each kind of nHAC was implanted into extraction sockets as follow:Group A,nHA/Col=3∶7(12 sites);Group B,nHA/Col=5∶5(12 sites);Group C,blank control group(12 sites).The bone repairing abilities of the two grafts such as vertical distance of alveolar,CT values,general observation,histological observation,trabecular volume fraction and porosity were separately analyzed at 1st,3rd and 6th month,respectively (each group had 4 sites in different time periods).Results nHAC were absorbed gradually after they were implanted into alveolar bone defect and were replaced by new bone.The vertical distance of alveolar bone in Group A([15.76±0.28] mm) was significant higher than that in Group B([14.88±0.36] mm),and CT values of Group A([879±31] HU) were higher than those in Group B([718±29] HU)(P<0.05).The trabecular bone volume percentage of Group A([22.2±0.4]%) was higher than that in Group B([20.3±0.4]%),and the bone porosity of Group A([23.6±0.9]%) was lower than that in Group B([27.6±0.6]%)(P<0.05).In addition,the vertical distance,CT values and the trabecular bone volume percentage of Group C was lower than those in Group A and B,but the bone porosity of Group C was higher.Conclusions The nHAC with nHA/ collagen ratio of 3:7 could better promote bone regeneration than nHAC with the nHA/collagen ratio of 5 ∶ 5 did.%目的 比较两种配比的纳米羟基磷灰石复合胶原材料(nano-hydroxyapatite/collagen,nHAC)在犬拔牙窝硬组织修复中的作用,以期为nHAC的临床应用提供参考.方法 按纳米羟基磷灰石和Ⅰ

  6. Frictional Effects on Gear Tooth Contact Analysis

    Zheng Li; Ken Mao

    2013-01-01

    The present paper concentrates on the investigations regarding the situations of frictional shear stress of gear teeth and the relevant frictional effects on bending stresses and transmission error in gear meshing. Sliding friction is one of the major reasons causing gear failure and vibration; the adequate consideration of frictional effects is essential for understanding gear contact behavior accurately. An analysis of tooth frictional effect on gear performance in spur gear is presented us...

  7. Bivalent histone modifications during tooth development

    Li-Wei Zheng; Bin-Peng Zhang; Ruo-Shi Xu; Xin Xu; Ling Ye; Xue-Dong Zhou

    2014-01-01

    Histone methylation is one of the most widely studied post-transcriptional modifications. It is thought to be an important epigenetic event that is closely associated with cell fate determination and differentiation. To explore the spatiotemporal expression of histone H3 lysine 4 trimethylation (H3K4me3) and histone H3 lysine 27 trimethylation (H3K27me3) epigenetic marks and methylation or demethylation transferases in tooth organ development, we measured the expression of SET7, EZH2, KDM5B and JMJD3 via immunohistochemistry and quantitative polymerase chain reaction (qPCR) analysis in the first molar of BALB/c mice embryos at E13.5, E15.5, E17.5, P0 and P3, respectively. We also measured the expression of H3K4me3 and H3K27me3 with immunofluorescence staining. During murine tooth germ development, methylation or demethylation transferases were expressed in a spatial–temporal manner. The bivalent modification characterized by H3K4me3 and H3K27me3 can be found during the tooth germ development, as shown by immunofluorescence. The expression of SET7, EZH2 as methylation transferases and KDM5B and JMJD3 as demethylation transferases indicated accordingly with the expression of H3K4me3 and H3K27me3 respectively to some extent. The bivalent histone may play a critical role in tooth organ development via the regulation of cell differentiation.

  8. Functional tooth regeneration using a bioengineered tooth unit as a mature organ replacement regenerative therapy.

    Oshima, Masamitsu; Mizuno, Mitsumasa; Imamura, Aya; Ogawa, Miho; Yasukawa, Masato; Yamazaki, Hiromichi; Morita, Ritsuko; Ikeda, Etsuko; Nakao, Kazuhisa; Takano-Yamamoto, Teruko; Kasugai, Shohei; Saito, Masahiro; Tsuji, Takashi

    2011-01-01

    Donor organ transplantation is currently an essential therapeutic approach to the replacement of a dysfunctional organ as a result of disease, injury or aging in vivo. Recent progress in the area of regenerative therapy has the potential to lead to bioengineered mature organ replacement in the future. In this proof of concept study, we here report a further development in this regard in which a bioengineered tooth unit comprising mature tooth, periodontal ligament and alveolar bone, was successfully transplanted into a properly-sized bony hole in the alveolar bone through bone integration by recipient bone remodeling in a murine transplantation model system. The bioengineered tooth unit restored enough the alveolar bone in a vertical direction into an extensive bone defect of murine lower jaw. Engrafted bioengineered tooth displayed physiological tooth functions such as mastication, periodontal ligament function for bone remodeling and responsiveness to noxious stimulations. This study thus represents a substantial advance and demonstrates the real potential for bioengineered mature organ replacement as a next generation regenerative therapy.

  9. Influence of musical instruments on tooth positions.

    Herman, E

    1981-08-01

    A 2-year longitudinal investigation was conducted at five New York City junior high schools on 11- to 13-year-old children starting instrumental music education to determine what tooth movement, if any, resulted from the playing of certain musical instruments. Questionnaires, interviews, oral examinations, and dental casts were used at the start of instrumental study, after one year, and then after a second year. Statistically significant anterior tooth movements occurred in an overwhelming majority of the instrumentalists, while negligible movements were recorded for the controls over this period. As a result of this study, certain recommendations can be made by dentists when they are asked to suggest instruments which are dentally suited for children. In most cases they can suggest more than one instrument which would be of benefit dentally to the individual child, especially in the increase or reduction of overjet and overbite. The playing of the correct musical instrument can serve as an adjunct to the dentist or orthodontist in trying to accomplish certain tooth movements.

  10. Influence of different tooth types on the bond strength of two orthodontic adhesive systems

    Öztürk, Bora; Koyutürk, Alp Erdin; Çatalbaş, Bülent; Özer, Füsun

    2008-01-01

    The aim of this investigation was to evaluate the effects of different tooth types on the shear bond strength (SBS) of two orthodontic resin adhesive systems in vitro. Two hundred extracted sound human teeth were used in the study. Ten teeth of each tooth type were the mounted in acrylic resin leaving the buccal surface of the crowns parallel to the base of the moulds. In each experimental group, the adhesives (Transbond XT™ and Light Bond™) were applied to the etched enamel surfaces. The orthodontic composite resins were then applied to the surface in cylindrical-shaped plastic matrices. For SBS testing, a force transducer (Ultradent™) was applied at a crosshead speed of 1 mm/minute at the interface between the tooth and composite until failure occurred. Data were analysed using two-way analysis of variance (ANOVA), Kruskal–Wallis one-way ANOVA, a Bonferroni adjusted Mann–Whitney U-test, and an independent t-test. Generally, it was found that tooth type had a significant effect on SBS (P < 0.05) with Light Bond™ showing a higher SBS than Transbond XT™ (P < 0.05). The highest bond strengths were observed for the upper central incisor and lower molars with Light Bond™ (P < 0.05) and the lowest mean bond strengths for the upper molars and lower canine with Transbond XT™ (P <0.05). The results demonstrated that enamel SBS was significantly altered by both tooth type and adhesive system. Thus, the findings of this study confirm that enamel bond strength is not uniform for all teeth. These results may also explain the variability in the enamel-bonding efficacy of adhesives. PMID:18678760

  11. Rapid tooth movement through distraction osteogenesis of the periodontal ligament in dogs

    AI Hong; XU Qing-feng; LU Hong-fei; MAI Zhi-hui; AN Ai-qun; LIU Guo-ping

    2008-01-01

    Background Animal models are needed for the study of rapid tooth movement into the extraction socket through distraction osteogenesis of the periodontal ligament.Methods Modified distraction devices were placed on eight dogs between the first and third mandibular premolars on the left sides;similar placement of traditional straight wise appliances on the right sides served as the control.The experimental distractors were activated(0.25 mm/d)twice a day and the control devices were activated(100 g)for two weeks with consolidation periods at weeks two,three,six,and ten.Two dogs were sacrificed at each consolidation time point;rates and patterns of tooth movement,loss of anchorage,and periapical films were evaluated,and the aftected premolars and surrounding periodontal tissues were decalcified and examined histologically.General observations,X-ray periapical filming and histology examination were performed.Results Distal movement((3.66±0.1 4)mm)measured two weeks after modified distraction exceeded that achieved using the traditional device((1.15±0.21)mm;P<0.05).Loss of anchorage was minimally averaged(0.34±0.06)mm and (0.32±0.07)mm in the experimental and control sides,respectively.By radiography,apical and lateral surface root resorptions on both sides were minimal.Alveolar bone Iesions were never evident.Fibroblasts were endched in periodontal ligaments and bone spicules formed actively along directions of distraction.Conclusions The canine model is suitable for the study of rapid tooth movement through distraction osteogenesis of the periodontal ligament.The technique accelerates tooth movement,periodontal remodeling,alveolar bone absorption,and may induce fibroblast formation,as compared to the traditional orthodontic method,without adversely affecting root absorption,bone loss,tooth mobility and anchorage loss.

  12. In vitro differentiation and attachment of human embryonic stem cells on periodontal tooth root surfaces.

    Inanç, Bülend; Elçin, A Eser; Elçin, Y Murat

    2009-11-01

    Periodontal tissue engineering based on cell replacement therapies is a promising field for improved regeneration of tooth supporting structures lost as a result of destructive periodontal diseases. Human embryonic stem cells (hESCs) could become adequate cell source for tissue engineering because of their unlimited proliferative potential and ability to differentiate to all somatic cell types. The aim of this study was to analyze the differentiation capacity of hESCs toward periodontal compartment cells and their relationship with tooth root surfaces in vitro. Periodontal ligament fibroblastic cell (PDLF) cultures were established and characterized; hESCs (HUES-9 line) were expanded in undifferentiated state and characterized for pluripotency morphologically and immunohistochemically. Extracted tooth root slices (RS) of 300 microm thickness, prepared with both periodontal and endodontic instrumentation, were used. Three different experimental groups were established: (i) undifferentiated hESC colonies cultured on and around the RS; (ii) undifferentiated hESC colonies cultured on and around RS with PDLF coculture, and (iii) undifferentiated hESC colonies cultured on and around RS with PDLF coculture in osteoinductive medium for 3 weeks. The fibrogenic and osteogenic marker expression was assessed with immunohistochemistry; histological staining and scanning electron microscopy were utilized to determine the relationship between differentiating hESCs and mineralized tooth root structures. Results demonstrate that hESC differentiation is influenced by tooth structures, PDLFs, and osteogenic medium, resulting with increased propensity toward mesenchymal lineage commitment, and formation of soft-hard tissue relationship in close contact areas. The proposed experimental system may facilitate further understanding in development of periodontal structures and contribute to realization of hESCs as a cell source in periodontal tissue engineering applications.

  13. Gray level co-occurrence and random forest algorithm-based gender determination with maxillary tooth plaster images.

    Akkoç, Betül; Arslan, Ahmet; Kök, Hatice

    2016-06-01

    Gender is one of the intrinsic properties of identity, with performance enhancement reducing the cluster when a search is performed. Teeth have durable and resistant structure, and as such are important sources of identification in disasters (accident, fire, etc.). In this study, gender determination is accomplished by maxillary tooth plaster models of 40 people (20 males and 20 females). The images of tooth plaster models are taken with a lighting mechanism set-up. A gray level co-occurrence matrix of the image with segmentation is formed and classified via a Random Forest (RF) algorithm by extracting pertinent features of the matrix. Automatic gender determination has a 90% success rate, with an applicable system to determine gender from maxillary tooth plaster images.

  14. Influence of tooth profile modification on spur gear dynamic tooth strain

    Oswald, Fred B.; Townsend, Dennis P.

    1995-06-01

    This paper presents results of dynamic strain gage measurements performed on the NASA gear-noise rig. The experiments were part of a joint research program between NASA and the U.S. Army Research Laboratory to advance the technology of rotorcraft transmissions. Tests were performed on six sets of low contact ratio spur gears with different tooth profile modifications. Results presented include static and dynamic measurements of gear tooth strain taken over a matrix of operating conditions. The results demonstrate that a well-designed tooth profile modification can significantly reduce dynamic loads in spur gears, especially for gears which operate at high speed and under high torque. The two parabolic modifications tested were not as effective as linear modifications, possibly because the modification zone was too long.

  15. Interleukin-1beta levels, pain intensity, and tooth movement using two different magnitudes of continuous orthodontic force.

    Luppanapornlarp, Suwannee; Kajii, Takashi S; Surarit, Rudee; Iida, Junichiro

    2010-10-01

    This study aimed to determine the optimum orthodontic force from a broader perspective. Interleukin (IL)-1β levels in human gingival crevicular fluid (GCF), pain intensity, and the amount of tooth movement were measured during canine retraction using different magnitudes of continuous orthodontic force. Sixteen subjects (two males and 14 females), aged 18-24 years, diagnosed with Class I bimaxillary protrusion and treated with first premolar extractions participated in this study. The upper canines were retracted with continuous forces of 50 or 150 g using nickel-titanium coil springs on segmented archwires. One of the lower canines was used as a control. GCF was collected from the distal site of each tooth at specific time points. IL-1β concentrations, pain intensity, using the visual analogue scale (VAS), and the amount of tooth movement were evaluated. One-way analysis of variance, Friedman, and paired t-tests were used for comparisons of IL-1β in GCF, the plaque and gingival indices, and the efficiency of tooth movement on pain perception, respectively. IL-1β concentration in the 150 g group showed the highest level at 24 hours and 2 months with significant differences compared with the control group (P magnitudes of continuous force at 2 months. A 50 g force could effectively induce tooth movement similar to 150 g with less pain and less inflammation.

  16. Endogenous and Exogenous Substances Influencing the Orthodontic Tooth Movement

    Mine Geçgelen Cesur

    2016-08-01

    Full Text Available Orthodontic tooth movement occurs as a result of prolonged application of controlled mechanical forces. Recent studies have focused on the effects of systemic or local applications of medications and the intake of dietary supplements as well as the mechanical forces. Factors affecting the orthodontic tooth movement are parathyroid hormone, thyroid hormones, estrogen, vitamin D3, eicosanoids, nonsteroidal anti-inflammatory drugs (NSAIDs, paracetamol, corticosteroids, bisphosphonates, cholesterol drugs, anticonvulsants, oral contraceptives, alcohol and nicotine use, nitric oxide, and fluoride. These medications have an important effect on the rate of tooth movement and treatment time. NSAIDs decrease tooth movement, but paracetamol has no effect. Parathyroid and thyroxin hormones increase tooth movement. Bisphosphonates have a strong inhibitory effect. Vitamin D3 stimulates tooth movement and dietary calcium seems to reduce it. It is important to discuss with patients about the consumption of these substances during orthodontic treatment.

  17. IBA analysis of a possible therapeutic ancient tooth inlay

    Andrade, E.; Pineda, J. C.; Zavala, E. P.; Murillo, G.; Chavez, R.; Lazcurain, R.; Espinosa, Ma. L.; Villanueva, O.

    1998-03-01

    Five pre-Columbian human teeth from the same skeleton found during excavation in an ancient ceremonial center in Mexico, have been analyzed by two conventional Ion Beam Analysis (IBA) techniques: PIXE and 4He RBS. The anthropologists have estimated that the skeleton is about 2000 years old. X-ray radiography studies of one of these teeth have revealed that they contain an inlay in the tooth crown. The IBA methods have been used to study the inlay materials and also the tooth enamel. The IBA studies show that the tooth inlay materials have almost the same atomic composition as the tooth enamel. These results suggest that the tooth inlay were made for therapeutic purposes, using healthy tooth grains as inlay materials which were glued into the prepared teeth to fill it up.

  18. Modular Permanent Magnet Machines with Alternate Teeth Having Tooth Tips

    Li, G. J.; Zhu, Z.Q.; Foster, M. P.; Stone, D. A.; Zhan, H.L.

    2015-01-01

    This paper presents single layer modular permanent magnet machines with either wound or unwound teeth with tooth tips. The structures with wound teeth having tooth tips are suitable for modular machines with slot number higher than pole number to compensate for the drop in winding factor due to the flux gaps in alternate stator teeth, accordingly to maintain or even to increase their average torques. However, the structures with unwound teeth having tooth tips are suitable for modular machine...

  19. A theropod tooth from the Late Triassic of southern Africa

    Sanghamitra Ray; Anusuya Chinsamy

    2002-06-01

    An isolated, large recurved and finely serrated tooth found associated with the prosauropod Euskelosaurus from the Late Triassic part of the Elliot Formation is described here. It is compared to the Triassic thecodonts and carnivorous dinosaurs and its possible affinity is discussed. The tooth possibly belongs to a basal theropod and shows some features similar to the allosauroids. This tooth is of significance, as dinosaur remains except for some footprints and trackways, are poorly known in the Late Triassic horizons of southern Africa.

  20. Research on the Extracting Method of Tooth Break Fault Characteristic Quantity of 2.5 MW Fan Gear Box%2.5MW风机齿轮箱的断齿故障特征量提取方法研究

    俞杭; 陈换过; 陈文华; 陈特; 严佩斯; 郭梦军

    2015-01-01

    The gear box is the core component in wind turbine, and is also one of the high failure rate components. The coupled rigid and flexible model of 2.5 MW fan gear box FZCR2500 is presented in this paper to carry out static strength check for the key parts in Level 1 transmission. The Level 1 transmission system tooth break fault model is established, and transient dynamic analysis is carried on based on the finite element analysis. The acceleration signal is decomposed by EEMD, and the characteristics-kurtosis index sensitive to tooth break fault is found out, which provides theoretical basis for tooth break fault diagnosis and analysis.%齿轮箱是风力发电机组中的核心部件,同时也是风力发电机组中故障率较高的部件之一。本文建立了2.5MW风机齿轮箱FZCR2500的刚柔耦合模型,并对传动系统的一级传动关键部件进行了静强度校核;建立了一级传动系统的断齿故障模型,基于有限元对其进行了瞬态动力学分析,通过EEMD对加速度信号进行分解,找出了对断齿故障比较敏感的特征量-峭度指标,为断齿故障诊断与分析提供理论依据。

  1. Evaluation of scaffold materials for tooth tissue engineering.

    Ohara, Takayuki; Itaya, Toshimitsu; Usami, Kazutada; Ando, Yusuke; Sakurai, Hiroya; Honda, Masaki J; Ueda, Minoru; Kagami, Hideaki

    2010-09-01

    Recently, the possibility of tooth tissue engineering has been reported. Although there are a number of available materials, information about scaffolds for tooth tissue engineering is still limited. To improve the manageability of tooth tissue engineering, the effect of scaffolds on in vivo tooth regeneration was evaluated. Collagen and fibrin were selected for this study based on the biocompatibility to dental papilla-derived cells and the results were compared with those of polyglycolic acid (PGA) fiber and beta-tricalcium phosphate (beta-TCP) porous block, which are commonly used for tooth, dentin and bone tissue engineering. Isolated porcine tooth germ-derived cells were seeded onto one of those scaffolds and transplanted to the back of nude mice. Tooth bud-like structures were observed more frequently in collagen and fibrin gels than on PGA or beta-TCP, while the amount of hard tissue formation was less. The results showed that collagen and fibrin gel support the initial regeneration process of tooth buds possibly due to their ability to support the growth of epithelial and mesenchymal cells. On the other hand, maturation of tooth buds was difficult in fibrin and collagen gels, which may require other factors.

  2. Comparison between normal and special chain-drive toothing

    Dolipski, M.

    1985-12-01

    A comparison of these two types of tooth arrangements on chain drives with round-link chains comes out clearly in favour of the special toothing. The article describes the advantages of this type of toothing. A proposal is made to use the special tooth arrangement in the construction of drive pocket wheels. Such a move would prevent the disastrous effects of links becoming jammed in the pockets during running-in and would consequently improve the service life of both chain and drive sprocket.

  3. Patient Discomfort Following Single-Tooth Implant Placement

    Spin-Neto, Rubens; Pontes, Ana Emília Farias; Wenzel, Ann

    2014-01-01

    Aims: Evaluate postoperative discomfort (pain, bleeding and swelling) in single-tooth implant patients submitted to immediate or conventional tooth restoration together with assessment of treatment time. Methods: Twenty-four patients who received single-tooth maxillary dental implants were randomly...... assigned to an IR (Immediate Restoration) or CR (Conventional Restoration) group. In IR, an implant was inserted and a provisional tooth crown was delivered within the same session, while in CR it was delivered three months after implantation. Pain (first three days), bleeding (first day) and swelling...

  4. A rotated palatal flap ridge preservation technique to enhance restorative and hard and soft tissue esthetics for tooth replacement in the anterior maxilla.

    Bitter, Robert N

    2010-04-01

    Hard and soft tissue alveolar ridge deformities occur following the extraction of teeth, creating functional and esthetic tooth replacement challenges, especially in the maxillary anterior smile zone. A surgical technique using a rotated palatal flap for ridge preservation is discussed that, whether combined with conventional fixed dentures or implant treatment for tooth replacement, provides the possibility for greatly improved esthetics. This technique, used in combination with or in preparation for implant treatment, allows for preservation of the alveolar bone height and width for improved implant size and placement options. In addition, preservation and enhancement of the soft tissue at the extraction site provides for soft tissue contours adjacent to the definitive restoration that vary little from those of the original natural tooth. Combined with conventional fixed dentures, use of this technique creates a template of the labial and interproximal sulcus of the extracted tooth, allowing for the molding of an ovate pontic replacement tooth. This results in vastly improved restorative emergence profiles with minimal or no change in the height of the labial gingival margin and the form and height of the interproximal papillae with adjacent teeth.

  5. Restoration of the Severely Decayed Tooth Using Crown Lengthening with Simultaneous Tooth-Preparation

    2010-01-01

    This clinical case describes a treatment approach that combines, in a single appointment, a crown lengthening procedure and the final crown preparation for the restoration of a severely decayed tooth. This approach allows for a more accurate placement of the crown margin in relation to the bone crest while reducing treatment time.

  6. Restoration of the severely decayed tooth using crown lengthening with simultaneous tooth-preparation.

    Park, Jun-Beom

    2010-04-01

    This clinical case describes a treatment approach that combines, in a single appointment, a crown lengthening procedure and the final crown preparation for the restoration of a severely decayed tooth. This approach allows for a more accurate placement of the crown margin in relation to the bone crest while reducing treatment time.

  7. Pediatric Charcot-Marie-Tooth disease.

    Jani-Acsadi, Agnes; Ounpuu, Sylvia; Pierz, Kristan; Acsadi, Gyula

    2015-06-01

    Heritable diseases of the peripheral nerves (Charcot-Marie-Tooth disease [CMT]) affect the motor units and sensory nerves, and they are among the most prevalent genetic conditions in the pediatric patient population. The typical clinical presentation includes distal muscle weakness and atrophy, but the severity and progression are largely variable. Improvements in supportive treatment have led to better preservation of patients' motor functions. More than 80 genes have been associated with CMT. These genetic discoveries, along with the developments of cellular and transgenic disease models, have allowed clinicians to better understand the disease mechanisms, which should lead to more specific treatments.

  8. Fate of HERS during Tooth Root Development

    HUANG, XIAOFENG; BRINGAS, PABLO; Slavkin, Harold C.; Chai, Yang

    2009-01-01

    Tooth root development begins after the completion of crown formation in mammals. Previous studies have shown that Hertwig's epithelial root sheath (HERS) plays an important role in root development, but the fate of HERS has remained unknown. In order to investigate the morphological fate and analyze the dynamic movement of HERS cells in vivo, we generated K14-Cre;R26R mice. HERS cells are detectable on the surface of the root throughout root formation and do not disappear. Most of the HERS c...

  9. Side effects of external tooth bleaching

    E.M., Bruzell; Pallesen, Ulla; Thoresen, N.R.

    2013-01-01

    -office = 39.3% [n = 28]; p >0.05; 95% CI [OR]: 0.198‑1.102) whereas prevalence of gingival irritation was higher after in-office treatment (at-home = 14.0%; in-office = 35.7%; p ... attributed to the bleaching treatment in the at-home and in-office groups, respectively. Predictors for side effects were tooth sensitivity, surface loss and gingivitis when observed at inclusion. Treatment-related predictors were bleaching concentration and contact between tray and gingiva. Conclusions...

  10. Common developmental pathways link tooth shape to regeneration.

    Fraser, Gareth J; Bloomquist, Ryan F; Streelman, J Todd

    2013-05-15

    In many non-mammalian vertebrates, adult dentitions result from cyclical rounds of tooth regeneration wherein simple unicuspid teeth are replaced by more complex forms. Therefore and by contrast to mammalian models, the numerical majority of vertebrate teeth develop shape during the process of replacement. Here, we exploit the dental diversity of Lake Malawi cichlid fishes to ask how vertebrates generally replace their dentition and in turn how this process acts to influence resulting tooth morphologies. First, we used immunohistochemistry to chart organogenesis of continually replacing cichlid teeth and discovered an epithelial down-growth that initiates the replacement cycle via a labial proliferation bias. Next, we identified sets of co-expressed genes from common pathways active during de novo, lifelong tooth replacement and tooth morphogenesis. Of note, we found two distinct epithelial cell populations, expressing markers of dental competence and cell potency, which may be responsible for tooth regeneration. Related gene sets were simultaneously active in putative signaling centers associated with the differentiation of replacement teeth with complex shapes. Finally, we manipulated targeted pathways (BMP, FGF, Hh, Notch, Wnt/β-catenin) in vivo with small molecules and demonstrated dose-dependent effects on both tooth replacement and tooth shape. Our data suggest that the processes of tooth regeneration and tooth shape morphogenesis are integrated via a common set of molecular signals. This linkage has subsequently been lost or decoupled in mammalian dentitions where complex tooth shapes develop in first generation dentitions that lack the capacity for lifelong replacement. Our dissection of the molecular mechanics of vertebrate tooth replacement coupled to complex shape pinpoints aspects of odontogenesis that might be re-evolved in the lab to solve problems in regenerative dentistry.

  11. Inadvertent tooth movement with fixed lingual retainers.

    Shaughnessy, Timothy G; Proffit, William R; Samara, Said A

    2016-02-01

    Fixed retainers are effective in maintaining the alignment of the anterior teeth more than 90% of the time, but they can produce inadvertent tooth movement that in the most severe instances requires orthodontic retreatment managed with a periodontist. This is different from relapse into crowding when a fixed retainer is lost. These problems arise when the retainer breaks but remains bonded to some or all teeth, or when an intact retainer is distorted by function or was not passive when bonded. In both instances, torque of the affected teeth is the predominant outcome. A fixed retainer made with dead soft wire is the least likely to create torque problems but is the most likely to break. Highly flexible twist wires bonded to all the teeth appear to be the most likely to produce inadvertent tooth movement, but this also can occur with stiffer wires bonded only to the canines. Orthodontists, general dentists, and patients should be aware of possible problems with fixed retainers, especially those with all teeth bonded, because the patient might not notice partial debonding. Regular observations of patients wearing fixed retainers by orthodontists in the short term and family dentists in the long term are needed.

  12. Hierarchical structure and biomineralization in cricket tooth

    Xing, Xueqing; Cai, Quan; Mo, Guang; Du, Rong; Chen, Zhongjun; Wu, Zhonghua

    2012-01-01

    Cricket is a truculent insect with stiff and sharp teeth as a fighting weapon. The structure and possible biomineralization of the cricket teeth are always interested. Synchrotron radiation X-ray fluorescence, X-ray diffraction and small angle X-ray scattering techniques were used to probe the element distribution, possible crystalline structures and size distribution of scatterers in cricket teeth. Scanning electron microscope was used to observe the nanoscaled structure. The results demonstrate that Zn is the main heavy element in cricket teeth. The surface of the cricket teeth has a crystalline compound like ZnFe2(AsO4)2(OH)2(H2O)4. While, the interior of the teeth has a crystalline compound like ZnCl2, which is from the biomineralization. The ZnCl2-like biomineral forms nanoscaled microfibrils and their axial direction points at the top of tooth cusp. The microfibrils aggregate random into intermediate filaments, forming a hierarchical structure. A sketch map of the cricket tooth cusp was proposed and a d...

  13. Effect of Tooth-structure Thickness on Light Attenuation and Depth of Cure.

    Hamlin, N J; Bailey, C; Motyka, N C; Vandewalle, K S

    2016-01-01

    Newer bulk-fill composites claim a greater depth of cure than conventional resin-based composites. To facilitate complete curing, the manufacturer of SonicFill (Kerr) recommends curing from the occlusal, as well as the buccal and lingual, surfaces of the tooth. The purpose of this study was to quantify the degree of curing light attenuation as it passes through natural tooth structure, and how this attenuation affects the depth of cure of different posterior resin composites. Ten noncarious extracted mandibular third molars were sectioned to produce 5-mm-thick pieces of buccal tooth structure. Sanding 0.5-mm increments from the flattened surface produced 4.5-, 4.0-, 3.5-, 3.0-, 2.5-, 2.0-, and finally 1.5-mm-thick sections. A Bluephase G2 (Ivoclar) curing light with an 8-mm-diameter light guide set on high for 20 seconds was used for measurement of irradiance as it passed through different thicknesses of tooth structure and air. The average irradiance (mW/cm(2)) was measured with a MARC-RC Resin Calibrator with a 4-mm-diameter sensor (BlueLight Analytics). To measure depth of cure of a conventional hybrid composite (Herculite Ultra; Kerr) vs a bulk-fill hybrid composite (SonicFill) through varying thicknesses of tooth structure, composites were cured in a 4-mm-diameter × 10.25-mm-long split mold according to International Organization for Standardization 4049. A mean and standard deviation was determined per group. Data were analyzed with a one-way analysis of variance (ANOVA)/Tukey test and two-way ANOVA/Tukey test (α=0.05). One-way ANOVA/Tukey found a significant decrease in irradiance based on thickness of tooth structure or distance through air (pstructure (p<0.001) and on composite type (p<0.001) with no significant interaction (p=0.623). SonicFill had a significantly greater depth of cure than Herculite Ultra.

  14. [Tooth decay and its complication prognosis in smokers].

    Orekhova, L Iu; Osipova, M V

    2014-01-01

    The study focuses on complicated and non-complicated tooth decay course and prognosis in smokers. Oral status, prevention and treatment effectiveness was assessed in 330 non-smokers and 345 smoking patients. The results allowed concluding with guidelines for tooth decay prevention and treatment in smokers.

  15. Severe tooth wear: European consensus statement on management guidelines

    Loomans, Bas AC; Attin, Thomas; Opdam, Niek JM;

    2016-01-01

    This paper reports a European expert consensus statement on guidelines for the management of severe tooth wear. It focuses on the definition of physiological versus pathological tooth wear and recommends diagnosis, monitoring and counseling to define the activity of the wear. Restorative interven...

  16. The Prevalence of Tooth Wear in the Dutch Adult Population

    Wetselaar, Peter; Vermaire, Jan H; Visscher, Corine M; Lobbezoo, Frank; Schuller, Annemarie A

    2016-01-01

    This study aimed to assess the prevalence of tooth wear in different age groups of the Dutch adult population and to determine this tooth wear distribution by gender, socioeconomic class, and type of teeth. Results were compared with the outcomes of a previous study in a comparable population. As pa

  17. Anomalies of tooth formation in hypohidrotic ectodermal dysplasia

    Lexner, Michala O; Bardow, Allan; Hertz, Jens Michael;

    2007-01-01

    is the first to elaborate on anomalies of tooth formation found in a group of hemizygous males and heterozygous females with known ED1 mutations. These tooth anomalies may be used as dental biomarkers for heterozygous females, enabling an earlier diagnosis, and therefore, better treatment and genetic...

  18. Crowned spur gears - Methods for generation and tooth contact analysis. I - Basic concepts, generation of the pinion tooth surface by a plane

    Litvin, F. L.; Handschuh, R. F.; Zhang, J.

    1988-01-01

    A topology of crowned spur pinion tooth surface that reduces the level of transmission errors due to misalignment is proposed. The geometry of the deviated pinion tooth surface and regular gear tooth surface, along with tooth contact analysis is discussed. Generation of the deviated pinion tooth surface by a plane whose motion is controlled by a five-degree-of-freedom system is proposed. Numerical results are included and indicate that transmission errors remain low as the gears are misaligned.

  19. Minimally Invasive Techniques to Accelerate the Orthodontic Tooth Movement: A Systematic Review of Animal Studies

    Irfan Qamruddin

    2015-01-01

    Full Text Available Objective. To evaluate various noninvasive and minimally invasive procedures for the enhancement of orthodontic tooth movement in animals. Materials and Methods. Literature was searched using NCBI (PubMed, PubMed Central, and PubMed Health, MedPilot (Medline, Catalogue ZB MED, Catalogue Medicine Health, and Excerpta Medica Database (EMBASE, and Google Scholar from January 2009 till 31 December 2014. We included original articles related to noninvasive and minimally invasive procedures to enhance orthodontic tooth movement in animals. Extraction of data and quality assessments were carried out by two observers independently. Results. The total number of hits was 9195 out of which just 11 fulfilled the inclusion criteria. Nine articles were good and 5 articles were moderate in quality. Low level laser therapy (LLLT was among the most common noninvasive techniques whereas flapless corticision using various instruments was among the commonest minimally invasive procedures to enhance velocity of tooth movement. Conclusions. LLLT, low intensity pulsed ultrasound (LIPUS, mechanical vibration, and flapless corticision are emerging noninvasive and minimally invasive techniques which need further researches to establish protocols to use them clinically with conviction.

  20. Transparent tooth model: A study of root canal morphology using different reagents

    Bhavana Gupta

    2014-01-01

    Full Text Available Background: The complexity of root canal morphology has fascinated the imaginations of many. Several techniques have been tried in the past to view the three-dimensional anatomy of the pulp canal system with varied success. It has been hypothesized in the present study that a combination of decalcifying agent and clearing agent can be used to prepare transparent tooth model. Aims: The aim of the present study was to access the efficacy of two decalcifying agent (formic acid and nitric acid and two clearing agents (methyl salicylate and eugenol to prepare transparent tooth model. Materials and Methods: The study material included 80 freshly extracted teeth both maxillary and mandibular. After decalcifying and clearing of the specimen, they were graded for transparency and haziness criteria. Results: The results of the present study indicated that methyl salicylate when used as a clearing agent showed better transparency, lower level of haziness and good root canal morphology. On the other hand samples cleared by eugenol showed good root canal morphology but lesser transparency and higher degree of haziness and yellowing of samples, more so when used in combination with nitric acid. Conclusion: It was concluded by the present study that combination of nitric acid when used with methyl salicylate proved to be the best combination for the preparation of the transparent tooth model.

  1. Isolation of epithelial cells from tooth brush and gender identification by amplification of SRY gene

    A Vikram Simha Reddy

    2011-01-01

    Full Text Available Introduction: This study determines the importance of tooth brush from which DNA can be isolated and used for sex determination in forensic analysis. Materials and Methods: A total of 30 samples were collected and stored at room temperature for different periods of time interval. The epithelial cells adhered to the bristles of tooth brush were collected and genomic DNA was extracted and quantified using Nanodrop 1000 spectrophotometer. Results: Gender identification was done by amplification of sex determining region on Y chromosome (SRY gene using real-time polymerase chain reaction and minimal amount of DNA (in pico grams with 100% sensitivity and 73.3% specificity, i.e., all male samples showed positive results and out of 15 female samples 4 showed false positive results, i.e wrongly identified as males. Conclusion: With this study, we conclude that PCR is a valuable and sensitive procedure where minute contamination may cause alteration in the result, i.e, 4 females showed false positive result. Minute amount of DNA in picograms, which was collected at different intervals is enough for amplification of SRY gene and tooth brush can be used as one of the very valuable sources of gender identification.

  2. An Analysis of the Symptomatic Domains Most Relevant to Charcot Marie Tooth Neuropathy (CMT) Patients

    2015-04-28

    Charcot Marie Tooth Disease (CMT); Hereditary Sensory and Motor Neuropathy; Nerve Compression Syndromes; Tooth Diseases; Congenital Abnormalities; Genetic Diseases, Inborn; Heredodegenerative Disorders, Nervous System

  3. Application of spontaneously immortalized odontoblast cells in tooth regeneration.

    Arany, Szilvia; Kawagoe, Masami; Sugiyama, Toshihiro

    2009-03-27

    Here, we report on the first attempt to bioengineer tooth using a spontaneously immortalized mesenchymal cell line. To assess the odontogenic potential of this cell line, odontoblast-lineage cells (OLC) were re-associated with competent dental epithelium isolated from E14.5 mice. A novel three-dimensional organ germ culture method was applied to nurture the constructs in vitro. Additionally, recombinants were transplanted under the kidney capsule in host animals for 2 weeks. Transplants developed into tooth tissues in one-third of the cases. OLC-derived GFP-positive cells could be identified in mineralizing tooth germs by immunohistochemistry. OLCs were capable of intercellular and cell-matrix communication, thus they eventually differentiated into functional odontoblasts. In summary, we managed to utilize OLCs for dental mesenchyme substitution in tooth regeneration experiments. Therefore, our spontaneously transformed cell line proved its potential for future complex, tooth developmental and bioengineering studies.

  4. Drinking coffee may help accelerate orthodontic tooth movement

    Jianru Yi

    2012-01-01

    Full Text Available Introduction: Developing new methods to enhance orthodontic tooth movement and shorten the duration of treatment has always been desired. However, to date, no therapies have been widely used in clinics. Recent studies and feedback information from patients have shown that drinking coffee may accelerate orthodontic tooth movement. The Hypothesis: Drinking coffee, as a daily habit of many people, can be an effective accelerator of tooth movement with little side effect for caffeine can break the calcium balance in bone tissue and directly inhibit the development of osteoblasts, leading to temporary decreased bone mineral density and consequently inducing faster orthodontic tooth movement. Evaluation of the Hypothesis: Much effort has been made to explore therapies to shorten orthodontic treatment period with limited success. Daily coffee consumption may be a promising approach to enhance orthodontic tooth movement for its reversible effect on bone mineral density and calcium balance.

  5. Reattachment of complicated tooth fracture: An alternative approach

    Nujella B. P. Surya Kumari

    2012-01-01

    Full Text Available Trauma to the anterior teeth is relatively a common occurrence. There are several treatment modalities for such condition, one of which is reattachment of fractured fragment itself. Reattachment of fractured fragment provides immediate treatment with better esthetics, restoration of function, and is a faster and less complicated procedure. Reattachment of tooth fragment should be the first choice and is a viable alternative to conventional approaches because of simplicity, natural esthetics, and conservation of tooth structure. Patient cooperation and understanding of the limitations of the treatment is of utmost importance for good prognosis.The present case report describes management of a complicated fracture of maxillary right central incisor treated endodontically, followed by reattachment of the same fragment. Reattachment of fractured tooth fragments offers a viable restorative alternative, immediately restores tooth function for the clinician because it restores tooth function and esthetics with the use of a very conservative and cost-effective approach.

  6. Initial observations of cheek tooth abnormalities in sheep in Slovenia.

    Erjavec, V; Crossley, D

    2010-07-24

    Observations were made on a small flock of 50 sheep of the native Slovenian Jezersko-Solcava breed by investigators with dental training. The aim was to determine the range of naturally occurring dental diseases, so postmortem examinations were performed on animals slaughtered for meat or culled due to disease. Additional data were obtained by examination of 25 specimens submitted for investigation of unexplained death at a pathology centre. Seventeen (34 per cent) of the flock had incisor disease but only five became clinically ill; all these five had advanced cheek tooth disease (gingival recession, periodontal pocketing, diastemata, missing teeth, occlusal wear abnormalities, food impaction, tooth mobility, tooth fracture, tooth loss and/or jaw abscessation). Advanced cheek tooth disease was found in 21 (84 per cent) of the sheep submitted to the pathology laboratory, while only seven (28 per cent) had advanced incisor disease. The results show that, as in other countries, dental disease is a serious problem for sheep in Slovenia.

  7. Ultrastructure of basement membranes in developing shark tooth.

    Sawada, T; Inoue, S

    2003-01-01

    Based on studies of the tooth of largely mammalian species, the dental basement membranes are shown to be specialized for various roles significant in the development and maintenance of the tooth. Comparative studies with the nonmammalian tooth will facilitate further clarification of the mechanisms of mammalian tooth formation. In this study, basement membranes of the shark tooth in successive developmental stages was ultrastructurally examined for elucidation of their roles in odontogenesis. Teeth of a shark, Cephaloscyllium umbratile, were processed for thin section electron microscopy. Throughout the developmental stages the lamina densa of the basement membrane was made up of a fine network of "cords," irregular anastomosing strands known to be the major component of mammalian basement membranes. In the presecretory stage of the shark tooth, dental papilla cells were immobilized for their differentiation into odontoblasts by means of the binding of their processes to numerous narrow extensions of the lamina densa of the inner dental epithelium. In the secretory stage, a number of cords of the widened lamina densa were extended towards and bound to tubular vesicles of the forming enameloid. During the mineralization stage, fragments of the degrading enameloid matrix appeared to be moving through the lamina densa to the epithelial cells for processing. In the maturation stage, half of the lamina densa facing the enameloid was mineralized forming an advancing edge of mineralization of the enameloid. It provided strong binding and smooth transition of organic to mineral phase which may allow transportation of substances across the phases for enameloid maturation in a way similar to that reported in the mammalian tooth. These observations indicate that basement membranes of the developing shark tooth, as those in the mammalian tooth, play various roles, including anchoring, firm binding, and possible mediation of the transport of substances that are known to be

  8. Condensing osteitis of the clavicle in a man: any relationship with tooth decay?

    Altiok, Inci Baltepe; Tokmak, Mehmet; Akman, Tarik; Alkan, Bahadir; Cosar, Murat

    2014-05-01

    Condensing osteitis of the clavicle is a rarely seen pathology since its first description in 1974. Although mechanical stress is claimed for aetiology, but remains a dilemma for physicians. The intermittent or steady pain is variable in intensity and generally localised at the medial end of the involved clavicle, supraclavicular fossa, ipsilateral anterior thorax and shoulder. In this report, we present a 28-year-old man with the regression of the condensing osteitis of the clavicle after the extraction of a decayed tooth.

  9. The use of a polycaprolactone-tricalcium phosphate scaffold for bone regeneration of tooth socket facial wall defects and simultaneous immediate dental implant placement in Macaca fascicularis

    Goh, B.T.; Chanchareonsook, N.; Tideman, H.; Teoh, S.H.; Chow, J.K.; Jansen, J.A.

    2014-01-01

    Bone regeneration and aesthetic outcomes may be compromised when immediate implants are placed at extraction sites with dehiscence defects. The aim of this study was to compare, in a monkey model, peri-implant bone regeneration and implant stability after immediate implant placement into tooth socke

  10. Endodontic Treatment of an Anomalous Anterior Tooth with the Aid of a 3-dimensional Printed Physical Tooth Model.

    Byun, Chanhee; Kim, Changhwan; Cho, Seungryong; Baek, Seung Hoon; Kim, Gyutae; Kim, Sahng G; Kim, Sun-Young

    2015-06-01

    Endodontic treatment of tooth formation anomalies is a challenge to clinicians and as such requires a complete understanding of the aberrant root canal anatomy followed by careful root canal disinfection and obturation. Here, we report the use of a 3-dimensional (3D) printed physical tooth model including internal root canal structures for the endodontic treatment of a challenging tooth anomaly. A 12-year-old boy was referred for endodontic treatment of tooth #8. The tooth showed class II mobility with swelling and a sinus tract in the buccal mucosa and periapical radiolucency. The tooth presented a very narrow structure between the crown and root by distal concavity and a severely dilacerated root. Moreover, a perforation site with bleeding and another ditching site were identified around the cervical area in the access cavity. A translucent physical tooth model carrying the information on internal root canal structures was built through a 3-step process: data acquisition by cone-beam computed tomographic scanning, virtual modeling by image processing, and manufacturing by 3D printing. A custom-made guide jig was then fabricated to achieve a safe and precise working path to the root canal. Endodontic procedures including access cavity preparation were performed using the physical tooth model and the guide jig. At the 7-month follow-up, the endodontically treated tooth showed complete periapical healing with no clinical signs and symptoms. This case report describes a novel method of endodontic treatment of an anomalous maxillary central incisor with the aid of a physical tooth model and a custom-made guide jig via 3D printing technique.

  11. Unusual intraosseous transmigration of impacted tooth

    Kumar, Santosh; Urala, Arun Srinivas; Kamath, Abhay Taranath; Jayaswal, Priyanka; Valiathan, Ashima [Manipal College of Dental Sciences, Manipal (India)

    2012-03-15

    Transmigration of an impacted tooth through the symphyseal suture is a rare and special developmental anomaly of unknown etiology that is unique to the mandibular canine. Maxillary canine transmigration is even rarer. Transmigrated canines are particularly significant due to the aesthetic and functional importance. A maxillary lateral incisor crossing the mid-palatal suture has never been reported in the literature. The aim of this report is to present the first case of simultaneous transmigration of a lateral incisor and canine in the maxilla. The paper also reports four unusual cases of unilateral canine transmigration in the maxilla and mandible and successful eruption of one of the transmigrated mandibular canines following orthodontic traction. Etiology of transmigration and its clinical considerations are also discussed.

  12. Tooth mobility changes subsequent to root fractures

    Andreasen, Jens Ove; Christensen, Søren Steno Ahrensburg; Tsilingaridis, Georgios

    2012-01-01

    of pulp necrosis in the coronal fragment. Furthermore, the effect of age, location of the fracture on the root, and observation period on mobility values was analyzed. Mobility values were measured for 44 of 95 previous reported root-fractured permanent incisors. Mobility changes were measured......The purpose of this study was to analyze tooth mobility changes in root-fractured permanent teeth and relate this to type of interfragment healing (hard tissue healing (HT), interfragment healing with periodontal ligament (PDL) and nonhealing with interposition of granulation tissue (GT) because...... after 3 months and 1 year, and a normalization of mobility value was usually found after 5 and 10 years. In 17 cases of PDL healing, generally a higher mobility was found in comparison with root fractures healing with hard tissue, and a consistent decrease in mobility value was found in the course...

  13. Diagnosis of Charcot-Marie-Tooth Disease

    Isabel Banchs

    2009-01-01

    Full Text Available Charcot-Marie-Tooth (CMT disease or hereditary motor and sensory neuropathy (HMSN is a genetically heterogeneous group of conditions that affect the peripheral nervous system. The disease is characterized by degeneration or abnormal development of peripheral nerves and exhibits a range of patterns of genetic transmission. In the majority of cases, CMT first appears in infancy, and its manifestations include clumsiness of gait, predominantly distal muscular atrophy of the limbs, and deformity of the feet in the form of foot drop. It can be classified according to the pattern of transmission (autosomal dominant, autosomal recessive, or X linked, according to electrophysiological findings (demyelinating or axonal, or according to the causative mutant gene. The classification of CMT is complex and undergoes constant revision as new genes and mutations are discovered. In this paper, we review the most efficient diagnostic algorithms for the molecular diagnosis of CMT, which are based on clinical and electrophysiological data.

  14. Restoring gingival harmony around single tooth implants.

    Reikie, D F

    1995-07-01

    One of the biggest challenges to restoring a single tooth implant in the esthetic zone of the mouth is the creation of harmonious gingival contour around the restoration. Soft- or hard-tissue deficiencies of the edentulous space are the most common obstacles to achieving gingival symmetry around the proposed restoration. Numerous gingival and osseous grafting and regeneration techniques are available but may complicate treatment by increasing the number of surgical procedures and sites necessary. This article describes a technique for treating mild-to-moderate ridge defects without the required additional surgical procedures or a surgical donor site. Soft-tissue overcontouring is provided around the healing abutment by modification of the surgical flap at second-stage implant surgery. Subsequent gingivoplasty allows establishment of anatomic gingival architecture that surrounds the single implant prosthesis.

  15. Single-Tooth Morse Taper Connection Implant Placed in Grafted Site of the Anterior Maxilla: Clinical and Radiographic Evaluation

    Francesco Guido Mangano

    2014-01-01

    Full Text Available The aim of this study was to achieve aesthetically pleasing soft tissue contours in a severely compromised tooth in the anterior region of the maxilla. For a right-maxillary central incisor with localized advanced chronic periodontitis a tooth extraction followed by reconstructive procedures and delayed implant placement was proposed and accepted by the patient. Guided bone regeneration (GBR technique was employed, with a biphasic calcium-phosphate (BCP block graft placed in the extraction socket in conjunction with granules of the same material and a resorbable barrier membrane. After 6 months of healing, an implant was installed. The acrylic provisional restoration remained in situ for 3 months and then was substituted with the definitive crown. This ridge reconstruction technique enabled preserving both hard and soft tissues and counteracting vertical and horizontal bone resorption after tooth extraction and allowed for an ideal three-dimensional implant placement. Localized severe alveolar bone resorption of the anterior maxilla associated with chronic periodontal disease can be successfully treated by means of ridge reconstruction with GBR and delayed implant insertion; the placement of an early-loaded, Morse taper connection implant in the grafted site was effective to create an excellent clinical aesthetic result and to maintain it along time.

  16. MICROWAVE PROPAGATION IN TOOTH AND DENTAL DEFECT

    Maria Papezova

    2016-09-01

    Full Text Available INTRODUCTION:The most common method of conventional dental diagnosisinvolves X-rays, such as Radio Tomography (RT or Computer Tomography (CT. Such methods are used for diagnosing pores in dental material that can lead to premature failure of dental material. Diagnosis by X-ray provides an objective analysis. However, repeated radiation from X-rays can cause biological damage to human tissues. From this point of view, there is a significant need to progress to quantitative non-invasive and non-destructive testing (NDT methods to measure dental material and improve treatment options. This article focuses on applying microwave technology to characterize teeth and teeth replacements. Knowledge of microwave propagation in biomaterial with no defects, using a defined microwave frequency range, and subsequently comparing the result with defective material could provide a means of dental diagnosis without the risk of radiation for the patient, i.e. without X-ray. OBJECTIVES: The primary objective of this study was to examine microwave technology in the field of dental medical diagnosis as a new NDT method. METHODS: The basic concept of applying microwave technology to characterize teeth in dental diagnosis was examined using a basic algorithm designed in the MATLAB programming language. Tests used dielectric properties of tooth and tooth decay and propagated electromagnetic (EM waves to show different characteristics of chosen materials.RESULTS: The analyses of frequency dependent reflection and transmission coefficients of the chosen material, specificallyteeth, atfrequency range 0 GHz to 30 GHz, computed differences between healthy and defective dental material.CONCLUSION: Thus, this could be used in providing a dental diagnosis without exposing patients to radiation, i.e. without X-ray. The next stage will involve creating a complete model of a jaw with teeth, and designing a sensor for crack detection for comparisons using this basic algorithm.

  17. Digital modeling technology for full dental crown tooth preparation.

    Dai, Ning; Zhong, Yicheng; Liu, Hao; Yuan, Fusong; Sun, Yuchun

    2016-04-01

    A dental defect is one of the most common oral diseases, and it often requires a full crown restoration. In this clinical operation, the dentist must manually prepare the affected tooth for the full crown so that it has a convergence angle between 4° and 10°, no undercuts, and uniform and even shoulder widths and depths using a high speed diamond bur in the patient׳s mouth within one hour, which is a difficult task that requires visual-manual operation. The quality of the tooth preparation has an important effect on the success rate of the subsequent prosthodontic treatment. This study involved research into digital modeling technology for full dental crown tooth preparation. First, the margin line of the tooth preparation was designed using a semi-automatic interactive process. Second, the inserting direction was automatically computed. Then, the characteristic parameters and the constraints on the tooth preparation were defined for the model. Next, the shoulder and axial surface of the tooth preparation were formed using parametric modeling. Finally, the implicit surface of a radial basis function was used to construct the tooth preparation׳s occlusal surface. The experimental results verified that the method of digital modeling for full crown preparation proposed in this study can quickly and accurately implement personalized designs of various parameters, such as the shoulder width and the convergence angle; it provides a digital design tool for full crown preparation.

  18. Safety issues of tooth whitening using peroxide-based materials.

    Li, Y; Greenwall, L

    2013-07-01

    In-office tooth whitening using hydrogen peroxide (H₂O₂) has been practised in dentistry without significant safety concerns for more than a century. While few disputes exist regarding the efficacy of peroxide-based at-home whitening since its first introduction in 1989, its safety has been the cause of controversy and concern. This article reviews and discusses safety issues of tooth whitening using peroxide-based materials, including biological properties and toxicology of H₂O₂, use of chlorine dioxide, safety studies on tooth whitening, and clinical considerations of its use. Data accumulated during the last two decades demonstrate that, when used properly, peroxide-based tooth whitening is safe and effective. The most commonly seen side effects are tooth sensitivity and gingival irritation, which are usually mild to moderate and transient. So far there is no evidence of significant health risks associated with tooth whitening; however, potential adverse effects can occur with inappropriate application, abuse, or the use of inappropriate whitening products. With the knowledge on peroxide-based whitening materials and the recognition of potential adverse effects associated with the procedure, dental professionals are able to formulate an effective and safe tooth whitening regimen for individual patients to achieve maximal benefits while minimising potential risks.

  19. Asymmetric extractions in orthodontics

    Camilo Aquino Melgaço

    2012-04-01

    Full Text Available INTRODUCTION: Extraction decisions are extremely important in during treatment planning. In addition to the extraction decision orthodontists have to choose what tooth should be extracted for the best solution of the problem and the esthetic/functional benefit of the patient. OBJECTIVE: This article aims at reviewing the literature relating the advantages, disadvantages and clinical implications of asymmetric extractions to orthodontics. METHODS: Keywords were selected in English and Portuguese and the EndNote 9 program was used for data base search in PubMed, Web of Science (WSc and LILACS. The selected articles were case reports, original articles and prospective or retrospective case-control studies concerning asymmetrical extractions of permanent teeth for the treatment of malocclusions. CONCLUSION: According to the literature reviewed asymmetric extractions can make some specific treatment mechanics easier. Cases finished with first permanent molars in Class II or III relationship in one or both sides seem not to cause esthetic or functional problems. However, diagnosis knowledge and mechanics control are essential for treatment success.

  20. Impact Damage Evaluation Method of Friction Disc Based on High-Speed Photography and Tooth-Root Stress Coupling

    Yin, L.; Shao, Y. M.; Liu, J.; Zheng, H. L.

    2015-07-01

    The stability of friction disc could be seriously affected by the tooth surface damage due to poor working conditions of the wet multi-disc brake in heavy trucks. There are few current works focused on the damage of the friction disc caused by torsion-vibration impacts. Hence, it is necessary to investigate its damage mechanisms and evaluation methods. In this paper, a damage mechanism description and evaluation method of a friction disc based on the high-speed photography and tooth-root stress coupling is proposed. According to the HighSpeed Photography, the collision process between the friction disc and hub is recorded, which can be used to determine the contact position and deformation. Combined with the strain-stress data obtained by the strain gauge at the place of the tooth-root, the impact force and property are studied. In order to obtain the evaluation method, the damage surface morphology data of the friction disc extracted by 3D Super Depth Digital Microscope (VH-Z100R) is compared with the impact force and property. The quantitative relationships between the amount of deformation and collision number are obtained using a fitting analysis method. The experimental results show that the damage of the friction disc can be evaluated by the proposed impact damage evaluation method based on the high-speed photography and tooth-root stress coupling.

  1. Multiple essential MT1-MMP functions in tooth root formation, dentinogenesis, and tooth eruption.

    Xu, H; Snider, T N; Wimer, H F; Yamada, S S; Yang, T; Holmbeck, K; Foster, B L

    2016-01-01

    Membrane-type matrix metalloproteinase 1 (MT1-MMP) is a transmembrane zinc-endopeptidase that breaks down extracellular matrix components, including several collagens, during tissue development and physiological remodeling. MT1-MMP-deficient mice (MT1-MMP(-/-)) feature severe defects in connective tissues, such as impaired growth, osteopenia, fibrosis, and conspicuous loss of molar tooth eruption and root formation. In order to define the functions of MT1-MMP during root formation and tooth eruption, we analyzed the development of teeth and surrounding tissues in the absence of MT1-MMP. In situ hybridization showed that MT1-MMP was widely expressed in cells associated with teeth and surrounding connective tissues during development. Multiple defects in dentoalveolar tissues were associated with loss of MT1-MMP. Root formation was inhibited by defective structure and function of Hertwig's epithelial root sheath (HERS). However, no defect was found in creation of the eruption pathway, suggesting that tooth eruption was hampered by lack of alveolar bone modeling/remodeling coincident with reduced periodontal ligament (PDL) formation and integration with the alveolar bone. Additionally, we identified a significant defect in dentin formation and mineralization associated with the loss of MT1-MMP. To segregate these multiple defects and trace their cellular origin, conditional ablation of MT1-MMP was performed in epithelia and mesenchyme. Mice featuring selective loss of MT1-MMP activity in the epithelium were indistinguishable from wild type mice, and importantly, featured a normal HERS structure and molar eruption. In contrast, selective knock-out of MT1-MMP in Osterix-expressing mesenchymal cells, including osteoblasts and odontoblasts, recapitulated major defects from the global knock-out including altered HERS structure, short roots, defective dentin formation and mineralization, and reduced alveolar bone formation, although molars were able to erupt. These data

  2. Contribution of prosthetic treatment considerations for dental extractions of permanent teeth.

    Fernández-Barrera, Miguel Ángel; Medina-Solís, Carlo Eduardo; Casanova-Rosado, Juan Fernando; Mendoza-Rodríguez, Martha; Escoffié-Ramírez, Mauricio; Casanova-Rosado, Alejandro José; Navarrete-Hernández, José de Jesús; Maupomé, Gerardo

    2016-01-01

    Background. Tooth loss is an easily identifiable outcome that summarizes a complex suite of factors in an individual's history of dental disease and its treatment by dental services over a lifetime. Assessment of overall tooth loss data is essential for epidemiologically evaluating the adequacy of dental care provided at a systems level, as well as for placing in context tooth loss for non-disease causes. For example, when derived from prosthetic treatment planning, the latter may unfortunately lead to some teeth being extracted (pulled) for the sake of better comprehensive clinical results. The objective of the present manuscript was to identify the contribution to overall tooth loss, by extraction of permanent teeth because of prosthetic treatment reasons. Material and Methods. A cross-sectional study included sex, age, total number of extractions performed by subject, sextant (anterior vs. posterior), group of teeth (incisors, canines, premolars and molars), upper or lower arch, and the main reason underlying extraction (extraction for any reason vs. prosthetic treatment), in patients 18 years of age and older seeking care at a dental school clinic in Mexico. A multivariate logistic regression model was generated. Results. A total of 749 teeth were extracted in 331 patients; 161 teeth (21.5% of total) were extracted for explicit prosthetic treatment indications. As age increased, the likelihood of having an extraction for prosthetic reasons increased 3% (OR = 1.03, p dental school clinical environment; age, sex, type of tooth, and the total number of extractions moderated such pattern.

  3. Revitalization of traumatized immature tooth with platelet-rich fibrin

    Umrana Faizuddin

    2015-01-01

    Full Text Available Endodontic treatment options for immature, nonvital teeth conventionally include surgical endodontics, apexification with calcium hydroxide, or single visit mineral trioxide aggregate plug. Regeneration is a new concept which is been introduced in the treatment of traumatized open apex tooth. Regeneration of pulp-dentin complex in an infected necrotic tooth with an open apex is possible if the canal is effectively disinfected. The purpose of this case report is to add a new vista in regenerative, endodontic therapy by using platelet-rich fibrin for revitalization of immature nonvital tooth.

  4. REASONS AND RISKS OF PERMANENT TEETH EXTRACTION. THE GENERAL DENTAL PRACTICE IN GREECE

    N.A. CHRYSANTHAKOPOULOS

    2013-12-01

    Full Text Available Aim: The aim of this retrospective study was to inves‑ tigate the reasons for tooth extraction and their associati‑ ons with possible risk indicators, such as socio-demographic and other epidemiological variables analyzed in dental practice in Greece. Materials and method: The study invol‑ ved 2,250 individuals, 1,170 males and 1,080 females aged 18 to 78 years. Data were collected by means of an intervi‑ ewer-administered questionnaire and oral clinical exami‑ nation. Statistical analysis of the questionnaire items was performed with a multivariate regression analysis model in order to estimate the possible associations between den‑ tal caries and periodontal disease as dependent variables, as well as the socio-demographic and other epidemiologi‑ cal variables, as independent parameters. Results: A total of 5,568 permanent teeth were extracted for various rea‑ sons during the study. The results showed that the main reasons for tooth extraction were dental caries (37.3% and periodontal disease (35.0%.Tooth extraction due to dental caries was associated with risk indicators of lower educa‑ tional and income level, inadequate oral hygiene and lack of a regular dental follow-up, whereas tooth extraction due to periodontal disease was associated with the same vari‑ ables, to which smoking was added. Conclusions: Dental caries and periodontal disease were the main reasons for tooth extraction in Greece. In addition, significant associ‑ ations were recorded between the causes of tooth extrac‑ tion and the possible risk indicators under analysis

  5. Evaluation of Reasons of Permanent Teeth Extraction in Iranian People (2009

    Kakoei S.

    2012-02-01

    Full Text Available Statement of Problem: Everyday, many people lose their teeth because of various reasons. Knowing the reasons of tooth extraction would help officials to make decisions for helping patients saving their teeth.Purpose: The aim of this study was to investigate the reasons of teeth extraction in dental clinics and some private offices in the city of Kerman in November 2009- February 2010.Materials and Method: In this cross-sectional study, the reasons of teeth extraction in 2076 teeth from 1500 patients selected by simple sampling from Kerman dental clinics were evaluated. Personal data such as gender, age, educational level, occupation, and family size as well as the main reason of tooth extraction (decay, periodontal diseases, prosthesis, tooth impaction, orthodontic reasons, and patient’s request and the type of tooth were collected by a checklist. Data were analyzed in SPSS, version 11.5 using χ² test.Results: The two main reasons of tooth extraction were dental caries (43.6% and patient request (30.6%, respectively. Overall, the first and third molars of the lower jaw were the most commonly extracted teeth. There was a significant relationship between gender and tooth extraction because of caries and orthodontic reasons ( p <0.0001. Meanwhile, the patients’ age had a significant relationship with most teeth extraction reasons ( p <0.0001. Except for patient’s request, educational level had a significant impact on other teeth extraction reasons ( p <0.0001. Conclusion: According to the results of this study, the most common reasons of tooth extraction were dental caries and patient request despite their restorability. Preventive programs and routine dental examination are recommended.

  6. Tooth regeneration: implications for the use of bioengineered organs in first-wave organ replacement.

    Nakahara, Taka; Ide, Yoshiaki

    2007-08-01

    Experiments with animal models have shown that the tooth crown structure can be regenerated using tissue engineering techniques that combine tooth bud cells and biodegradable materials, or by using embryonic tissue and adult stem cells. Moreover, tooth roots and periodontal tissues have been reconstructed by grafting dental stem cells, which leads to the recovery of tooth function, suggesting that tooth regeneration will become possible in humans in the near future. The present article reviews current research on tooth regeneration, discusses a model of tooth replacement that could be used clinically, and proposes a new tooth regeneration approach that overcomes the difficulties associated with the tooth replacement model. Tooth regeneration is an important stepping stone in the establishment of engineered organ transplantation, which is one of the ultimate goals of regenerative therapies.

  7. Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans.

    Shen, B.; Dong, L.; S. Xiao; Lang, X; K. Huang; Peng, Y.; C. Zhou; Ke, S; Liu, P

    2016-01-01

    Molar tooth structures are ptygmatically folded and microspar-filled structures common in early- and mid-Proterozoic (∼2,500-750 million years ago, Ma) subtidal successions, but extremely rare in rocks

  8. Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans

    Shen, Bing; Dong, Lin; Xiao, Shuhai; Lang, Xianguo; Huang, Kangjun; Peng, Yongbo; Zhou, Chuanming; Ke, Shan; Liu, Pengju

    2016-01-01

    Molar tooth structures are ptygmatically folded and microspar-filled structures common in early- and mid-Proterozoic (∼2,500–750 million years ago, Ma) subtidal successions, but extremely rare in rocks

  9. Enhanced Prediction of Gear Tooth Surface Fatigue Life Project

    National Aeronautics and Space Administration — Sentient will develop an enhanced prediction of gear tooth surface fatigue life with rigorous analysis of the tribological phenomena that contribute to pitting...

  10. Making a tooth: growth factors, transcription factors, and stem cells

    Yah Ding ZHANG; Zhi CHEN; Yi Qiang SONG; Chao LIU; Yi Ping CHEN

    2005-01-01

    Mammalian tooth development is largely dependent on sequential and reciprocal epithelial-mesenchymal interactions.These processes involve a series of inductive and permissive interactions that result in the determination, differentiation,and organization of odontogenic tissues. Multiple signaling molecules, including BMPs, FGFs, Shh, and Wnt proteins,have been implicated in mediating these tissue interactions. Transcription factors participate in epithelial-mesenchymal interactions via linking the signaling loops between tissue layers by responding to inductive signals and regulating the expression of other signaling molecules. Adult stem cells are highly plastic and multipotent. These cells including dental pulp stem cells and bone marrow stromal cells could be reprogrammed into odontogenic fate and participated in tooth formation. Recent progress in the studies of molecular basis of tooth development, adult stem cell biology, and regeneration will provide fundamental knowledge for the realization of human tooth regeneration in the near future.

  11. Management of premature primary tooth loss in the child patient.

    Law, Clarice S

    2013-08-01

    Premature loss of primary teeth can result in a loss of arch length and have a negative effect on occlusion and alignment, often increasing the need for orthodontic treatment. Use of space maintainers can reduce the severity of problems such as crowding, ectopic eruption, tooth impaction and poor molar relationship. This article presents a review of the consequences of premature tooth loss and discusses the appliances commonly used for space maintenance.

  12. Endogenous and Exogenous Substances Influencing the Orthodontic Tooth Movement

    Mine Geçgelen Cesur; Gözde Beygirci

    2016-01-01

    Orthodontic tooth movement occurs as a result of prolonged application of controlled mechanical forces. Recent studies have focused on the effects of systemic or local applications of medications and the intake of dietary supplements as well as the mechanical forces. Factors affecting the orthodontic tooth movement are parathyroid hormone, thyroid hormones, estrogen, vitamin D3, eicosanoids, nonsteroidal anti-inflammatory drugs (NSAIDs), paracetamol, corticosteroids, bisphosphonates, choleste...

  13. DENTAL IMPLANTS: AS AN ALTERNATIVE FOR TOOTH REPLACEMENT

    Banerjee Nandini; Singh Sushma

    2013-01-01

    A dental implant is an artificial tooth that replaces a tooth that has been taken out. Implants are natural-looking, can provide support for dentures and do not affect the teeth bordering them. They are as stable as your real teeth and protect you from the loss of jawbone, which occurs when you lose teeth. Endosseous dental implants have revolutionized the fields of implants and periodontics. During the last decade, a great deal of information has been generated concerning the effectiveness a...

  14. Ectopic Supernumerary Tooth in Nasal Septum: A Case Study

    Saleh Mohebbi

    2013-06-01

    Full Text Available Introduction: Nasal teeth eruption is a rare phenomenon. The variability of symptoms and generic history makes the diagnosis difficult. This difficulty is more challenging when the tooth is placed in the depth of septum.   Case Report: Our case is an example of this problem. Herein, we present a case of intraseptal tooth with nasal obstruction and septal deviation and recurrent sinusitis. We present preoperative imaging.   Conclusion: Great suspicion may helpful for preoperative diagnosis and good deciding.

  15. The Prevalence and Treatment Outcomes of Primary Tooth Injuries

    2010-01-01

    Objectives: The aim of the present study was to evaluate the type and prevalence of primary tooth injuries, as well as their treatment and treatment outcomes, among children referred to the Department of Pedodontics at the Ankara University Faculty of Dentistry in Turkey. Methods: The study population consisted of patients applying to the department with a primary tooth injury over a period of 21 months. Fifty-one patients presented with trauma to 99 primary teeth. Clinical and radiographic e...

  16. Study on the effect of x-ray radiation on the dental extraction wounds

    Shimizu, Takefumi (Nihon Univ., Tokyo. School of Dentistry)

    1982-03-01

    Male Donryu rats were irradiated with 1,500 rad (group 2) or 2,000 rad (group 3) with a 10 MeV electron beam. Seven days later their first left upper molar (M1) was extracted, and the dental extraction wound was examined histopathologically 3, 7, 14, 21, 35, 49 and 90 days later (5 rats each day). The findings were compared with those obtained on nonirradiated rats whose M1 were also removed (group 1). Covering by epithelium was seen on all the rats in group 1 on the 7th day after tooth extraction, in group 2 on the 21st day, and in group 3 on the 49th day. The bone absorption of tooth extraction lacuna in group 2 and 3 was prominent, increasing with time, as compared with group 1. Sequester formation was particularly prominent in group 3, and in many cases the extraction lacuna was malformed. Restoration by regenerated bone was detected in group 1 on the 14th day after tooth extraction, and in group 2 on the 35th day, but it was only slight in group 3 even on the 90th day. Therefore, it was clear that irradiation of the upper jaw of rats before tooth extraction caused delayed healing of the lacuna of the extracted tooth, and that the effect was dose dependent.

  17. Esthetic-functional recovery of permanent posterior tooth using autogenous biological restoration

    A M Botelho

    2012-01-01

    Full Text Available Occlusal morphology and difficult access for cleaning permanent molars result in the buildup of bacterial plaque and the development of caries. One method known as biological restoration was carried out. This technique known as biological restoration, has as main restorative material a fragment obtained from a duly donated extracted human tooth. This case report describes the restoration of an extensively decayed molar through the bonding of a fragment obtained from a third molar extracted from the patient himself. Biological restoration is a low-cost option that offers satisfactory aesthetic, morphological and functional results.The morphological/functional reestablishment of posterior teeth can be obtained through biological restoration, which allows the recovery of properties inherent to the dental structure, offers satisfactory aesthetic results and low cost.

  18. The combination use of platelet-rich fibrin and treated dentin matrix for tooth root regeneration by cell homing.

    Ji, Baohui; Sheng, Lei; Chen, Gang; Guo, Shujuan; Xie, Li; Yang, Bo; Guo, Weihua; Tian, Weidong

    2015-01-01

    Endogenous regeneration through cell homing provides an alternative approach for tissue regeneration, except cell transplantation, especially considering clinical translation. However, tooth root regeneration through cell homing remains a provocative approach in need of intensive study. Both platelet-rich fibrin (PRF) and treated dentin matrix (TDM) are warehouses of various growth factors, which can promote cell homing. We hypothesized that endogenous stem cells are able to sense biological cues from PRF membrane and TDM, and contribute to the regeneration of tooth root, including soft and hard periodontal tissues. Therefore, the biological effects of canine PRF and TDM on periodontal ligament stem cells (PDLSCs) and bone marrow mesenchymal stem cells (BMSCs) were evaluated respectively in vitro. Beagle dogs were used as orthotopic transplantation model. It was found that PRF significantly recruited and stimulated the proliferation of PDLSCs and BMSCs in vitro. Together, PRF and TDM induced cell differentiation by upregulating the mineralization-related gene expression of bone sialoprotein (BSP) and osteopotin (OPN) after 7 days coculture. In vivo, transplantation of autologous PRF and allogeneic TDM into fresh tooth extraction socket achieved successful root regeneration 3 months postsurgery, characterized by the regeneration of cementum and periodontal ligament (PDL)-like tissues with orientated fibers, indicative of functional restoration. The results suggest that tooth root connected to the alveolar bone by cementum-PDL complex can be regenerated through the implantation of PRF and TDM in a tooth socket microenvironment, probably by homing of BMSCs and PDLSCs. Furthermore, bioactive cues and inductive microenvironment are key factors for endogenous regeneration. This approach provides a tangible pathway toward clinical translation.

  19. Modification of tooth development by heat shock protein 60

    Tamas Papp; Angela Polyak; Krisztina Papp; Zoltan Meszar; Roza Zakany; Eva Meszar-Katona; Palne Terdik Tu nde; Chang Hwa Ham; Szabolcs Felszeghy

    2016-01-01

    Although several heat shock proteins have been investigated in relation to tooth development, no available information is available about the spatial and temporal expression pattern of heat shock protein 60 (Hsp 60). To characterize Hsp 60 expression in the structures of the developing tooth germ, we used Western blotting, immunohistochemistry and in situ hybridization. Hsp 60 was present in high amounts in the inner and outer enamel epithelia, enamel knot (EK) and stratum intermedium (SI). Hsp 60 also appeared in odontoblasts beginning in the bell stage. To obtain data on the possible effect of Hsp 60 on isolated lower incisors from mice, we performed in vitro culturing. To investigate the effect of exogenous Hsp 60 on the cell cycle during culturing, we used the 5-bromo-2- deoxyuridine (BrdU) incorporation test on dental cells. Exogenously administered Hsp 60 caused bluntness at the apical part of the 16.5-day-old tooth germs, but it did not influence the proliferation rate of dental cells. We identified the expression of Hsp 60 in the developing tooth germ, which was present in high concentrations in the inner and outer enamel epithelia, EK, SI and odontoblasts. High concentration of exogenous Hsp 60 can cause abnormal morphology of the tooth germ, but it did not influence the proliferation rate of the dental cells. Our results suggest that increased levels of Hsp 60 may cause abnormalities in the morphological development of the tooth germ and support the data on the significance of Hsp during the developmental processes.

  20. Young's modulus and hardness of shark tooth biomaterials.

    Whitenack, Lisa B; Simkins, Daniel C; Motta, Philip J; Hirai, Makoto; Kumar, Ashok

    2010-03-01

    To date, the majority of studies on feeding mechanics in sharks have focused on the movement of cranial components and muscle function, with little attention to tooth properties or function. Attributes related to mechanical properties, such as structural strength, may also be subjected to natural selection. Additionally it is necessary to characterize these properties in order to construct biomechanical models of tooth function. The goal of this study was to determine hardness and elastic modulus for the shark tooth materials enameloid, osteodentine, and orthodentine. Five teeth each from one carcharhiniform species, the bonnethead Sphyrna tiburo, and one lamniform, the sand tiger shark Carcharias taurus, were utilized for nanoindentation testing. Each tooth was sectioned transversely, air-dried, and polished. Both enameloid and dentine were tested on each tooth via a Berkovich diamond tip, with nine 2 microm deep indentations per material. t-Tests were used to determine if there were differences in hardness and Young's modulus between the tooth materials of the two species. There was no significant difference between the two species for the material properties of enameloid, however both hardness and Young's modulus were higher for osteodentine than for orthodentine. This may be due to differences in microanatomy and chemical composition, however this needs to be studied in greater detail.

  1. Corticision: A Flapless Procedure to Accelerate Tooth Movement.

    Park, Young Guk

    2016-01-01

    Orthodontic tooth movement results from applied forces to the teeth evoking cellular responses in the teeth and their surrounding tissues, including the periodontal ligament, alveolar bone and gingiva. It is advantageous for the orthodontist to be well informed of the detailed process of the biological events that unfold during tooth movement, since some of these details may differ from one person to another due to biological differences such as periodontal metabolism or alveolar bone density. This led us to emphasize that orthodontics is a field of endeavor where the integration of mechanics and biology is materialized, and to affirm the fact that tooth movement is conducted in individual human beings, each composed of a unique and intricate physiological system. Biological variations may be the foundation of the differences that are frequently observed in the outcomes of orthodontic treatment in particular with reference to treatment duration between patients with similar malocclusions and who were treated identically. A wide diversity of clinical trials has been carried out to control the tissue resistance to facilitate orthodontic tooth movement, which involves biomechanical, pharmaceutical, surgical, electrical regimens or tissue engineering technology. The term 'Corticision' is a neologism which indicates 'cortical bone incision'. It is a minimally invasive periodontal procedure without flap elevation, thus accelerating tooth movement with an enhanced turnover rate of the surrounding structures. This chapter introduces the technical procedure, and the biological background of how such a minor surgical procedure can receive the accelerated tooth movement with impunity and thereby shorten the duration of treatment.

  2. Anterior tooth morphology and its effect on torque.

    van Loenen, M; Degrieck, J; De Pauw, G; Dermaut, L

    2005-06-01

    This study was undertaken to determine the variation in crown-root angle (CRA) of the upper incisors and canines as well as the variation in their labial contour. In addition, the influence of the variability of the labial contour and of different bracket heights on torque was evaluated. Proximal radiographs were taken of 160 extracted maxillary teeth (81 incisors and 79 canines). They were digitized and analysed with Jasc Paint Shop Pro 7TM and Mathcad 2001 Professional. The incisal edge, the centre of the cemento-enamel junction (CEJ), and the root apex were digitized to define the crown and root long axis. For all teeth the CRA was measured. At several heights of the labial surface a tangent was determined, enabling measurement of the inclination of the labial surface. The CRA had great variability, ranging from 167 to 195 degrees for the canines (mean value 183 degrees) and from 171 to 195 degrees for the incisors (average 184 degrees). The mean inclinations of the labial surfaces for the incisors varied greatly. Between 4 and 4.5 mm from the incisal edge the standard deviations (SD) were the smallest and between 2 and 4.5 mm from the incisal edge the labial surface angle differed by approximately 10 degrees. For the canines the mean inclinations of the buccal surface also varied. This angle differed by around 10 degrees between 2 and 4.5 mm from the incisal edge, but the SD were much larger than for the incisors. It can be concluded that placement of a bracket on a tooth at varying heights, still within a clinically acceptable range, results in important differences in the amount of root torque.

  3. Treatment responses to tooth whitening in twins.

    Corby, Patricia M A; Biesbrock, Aaron; Gerlach, Robert; Corby, Andrea L; Moreira, Alexandre; Schork, Nicholas J; Bretz, Walter A

    2014-02-01

    The aim of this study was to determine heritability estimates of treatment responses to a 10% hydrogen peroxide strip-based whitening system in twins. Eighty-five twin pairs were randomly assigned to 10% hydrogen peroxide whitening strips or placebo strips without peroxide. Both twins (monozygotic or dizygotic) received the same treatment. Maxillary teeth were treated for 30 minutes twice daily for 7 days. Efficacy was measured objectively as L* (light-dark), a* (red-green), and b* (yellow-blue) color change from digital images at baseline (∆) and day 8. Heritability estimates for tooth whitening treatment responses for changes from day 8 to baseline were obtained using variance-component methodologies. Whitening treatment responses were highly heritable (h(2) = 71.0) for ∆b* and ∆a*(p < .0001), but not for ∆L* (h(2) = 27.0), which was essentially modulated by environmental factors. This study has demonstrated that both genetic and environmental factors significantly contributed to seven-day whitening treatment responses achieved with 10% hydrogen peroxide strips.

  4. [Pathology of Charcot-Marie-Tooth Disease].

    Oka, Nobuyuki

    2016-01-01

    Although genetic testing is available, nerve biopsy is useful in selected patients for the diagnosis of Charcot-Marie-Tooth disease (CMT). These are sporadic cases of hereditary neuropathy, or familial cases in which genetic testing is negative. CMT is caused by mutations of various genes. The pathological features of CMT have mostly been investigated using nerve biopsy, which may shed light on the presumed functions of mutated gene products. PMP22 duplication in CMT1A induces numerous large onion bulb lesions (OB). Compared to chronic inflammatory demyelinating polyradiculoneuropathy, the differential features of CMT1A are patchy distribution of OB and non-inflammatory lesions. CMT1B also manifests as OB, but presents abnormal compaction of myelin sheaths caused by uncompacted myelin or excessive myelin folding. CMT2 includes axonal neuropathies and many causative genes have been found. CMT2A (MFN2 mutation) shows abnormal mitochondria with a spherical morphology instead of tubular in the longitudinal direction. CMT4 consists of autosomal recessive forms with demyelinating pathology. Most subtypes have mutations of genes relating to myelin maintenance, and pathologically, they show abnormal folding of the myelin structure.

  5. Biomaterials in tooth tissue engineering: a review.

    Sharma, Sarang; Srivastava, Dhirendra; Grover, Shibani; Sharma, Vivek

    2014-01-01

    Biomaterials play a crucial role in the field of tissue engineering. They are utilized for fabricating frameworks known as scaffolds, matrices or constructs which are interconnected porous structures that establish a cellular microenvironment required for optimal tissue regeneration. Several natural and synthetic biomaterials have been utilized for fabrication of tissue engineering scaffolds. Amongst different biomaterials, polymers are the most extensively experimented and employed materials. They can be tailored to provide good interconnected porosity, large surface area, adequate mechanical strengths, varying surface characterization and different geometries required for tissue regeneration. A single type of material may however not meet all the requirements. Selection of two or more biomaterials, optimization of their physical, chemical and mechanical properties and advanced fabrication techniques are required to obtain scaffold designs intended for their final application. Current focus is aimed at designing biomaterials such that they will replicate the local extra cellular environment of the native organ and enable cell-cell and cell-scaffold interactions at micro level required for functional tissue regeneration. This article provides an insight into the different biomaterials available and the emerging use of nano engineering principles for the construction of bioactive scaffolds in tooth regeneration.

  6. The orthodontic extraction of permanent molars: a literature review.

    Chua, Emilia S L; Felicita, A Sumathi

    2015-05-01

    The most common cause of dental crowding is the presence of an arch-length--tooth-size discrepancy. Conventional methods of gaining space in orthodontics involve the extraction of teeth, often premolars. However, there are a number of clinical situations in which the extraction of permanent molars might be considered. This paper highlights the indications, advantages, disadvantages and timing of the extraction of the first, second and third permanent molars in the treatment of a crowded malocclusion.

  7. Use of ultrasound Doppler to determine tooth vitality in a discolored tooth after traumatic injury: its prospects and limitations.

    Cho, Yong-Wook; Park, Sung-Ho

    2014-02-01

    When a tooth shows discoloration and does not respond to the cold test or electric pulp test (EPT) after a traumatic injury, its diagnosis can be even more difficult due to the lack of proper diagnostic methods to evaluate its vitality. In these case reports, we hope to demonstrate that ultrasound Doppler might be successfully used to evaluate the vitality of the tooth after trauma, and help reduce unnecessary endodontic treatments. In all three of the present cases, the teeth were discolored after traumatic injuries and showed negative responses to the cold test and EPT. However, they showed distinctive vital reactions in the ultrasound Doppler test during the whole observation period. In the first case, the tooth color returned to normal, and the tooth showed a positive response to the cold test and EPT at 10 wk after the injury. In the second case, the tooth color had returned to its normal shade at 10 wk after the traumatic injury but remained insensitive to the cold test and EPT. In the third case, the discoloration was successfully treated with vital tooth bleaching.

  8. Autocrine and paracrine Shh signaling are necessary for tooth morphogenesis, but not tooth replacement in snakes and lizards (Squamata).

    Handrigan, Gregory R; Richman, Joy M

    2010-01-01

    Here we study the role of Shh signaling in tooth morphogenesis and successional tooth initiation in snakes and lizards (Squamata). By characterizing the expression of Shh pathway receptor Ptc1 in the developing dentitions of three species (Eublepharis macularius, Python regius, and Pogona vitticeps) and by performing gain- and loss-of-function experiments, we demonstrate that Shh signaling is active in the squamate tooth bud and is required for its normal morphogenesis. Shh apparently mediates tooth morphogenesis by separate paracrine- and autocrine-mediated functions. According to this model, paracrine Shh signaling induces cell proliferation in the cervical loop, outer enamel epithelium, and dental papilla. Autocrine signaling within the stellate reticulum instead appears to regulate cell survival. By treating squamate dental explants with Hh antagonist cyclopamine, we induced tooth phenotypes that closely resemble the morphological and differentiation defects of vestigial, first-generation teeth in the bearded dragon P. vitticeps. Our finding that these vestigial teeth are deficient in epithelial Shh signaling further corroborates that Shh is needed for the normal development of teeth in snakes and lizards. Finally, in this study, we definitively refute a role for Shh signaling in successional dental lamina formation and conclude that other pathways regulate tooth replacement in squamates.

  9. Histology of tooth attachment tissues and plicidentine in Varanus (Reptilia: Squamata), and a discussion of the evolution of amniote tooth attachment.

    Maxwell, Erin E; Caldwell, Michael W; Lamoureux, Denis O; Budney, Lisa A

    2011-10-01

    Few recent studies have examined the histological basis for tooth attachment in squamates. In the past few years, a surge of interest in this topic has led to the intriguing suggestion that the major tissues derived from the tooth germ (enamel, dentine, cementum and alveolar bone), are conservative and are present in all amniotes. In this study, we describe the histology and development of the tooth attachment complex in Varanus rudicollis, the rough-neck monitor. We provide the first published evidence for the role of cementum and alveolar bone in tooth attachment in varanoid lizards. In Varanus, cementum is deposited on the external surface of the tooth root as well as at the base of the tooth, where it plays a role in the attachment of the tooth to the jawbone. Alveolar bone is also involved in tooth ankylosis. Our results support the hypothesis that the major tooth germ tissues are found in all amniotes. We provide insights into the structure and development of plicidentine, defined as infolding of the dentine around the tooth base. This feature is unique to varanoids among extant tetrapods and is the third tissue implicated in tooth attachment in Varanus. Plicidentine develops asymmetrically along the labial-lingual axis of a tooth. Varanus is characterized by the presence of both primary and higher-order lamellae, which anastomose to form a honeycomb-like surface that then interacts with the more basal attachment tissues.

  10. Degenerative alterations of the cementum-periodontal ligament complex and early tooth loss in a young patient with periodontal disease.

    Petruţiu, S A; Buiga, Petronela; Roman, Alexandra; Danciu, Theodora; Mihu, Carmen Mihaela; Mihu, D

    2012-01-01

    Premature exfoliation of primary or permanent teeth in children or adolescents is extremely rare and it can be a manifestation of an underlying systemic disease. This study aims to present the histological aspects associated with early tooth loss in a case of periodontal disease developed without local inflammation and with minimal periodontal pockets and attachment loss. The maxillary left second premolar was extracted together with a gingival collar attached to the root surface. The histological analysis recorded the resorption of the cementum in multiple areas of the entire root surface with the connective tissue of the desmodontium invading the lacunae defects. The connective tissue rich in cells occupied the periodontal ligamentar space and the resorptive areas. No inflammation was obvious in the periodontal ligament connective tissue. This report may warn clinicians about the possibility of the association of cemental abnormalities with early tooth loss.

  11. Autotransplantation of a Supernumerary Tooth to Replace a Misaligned Incisor with Abnormal Dimensions and Morphology: 2-Year Follow-Up

    R. Ebru Tirali

    2013-01-01

    Full Text Available Autotransplantation is a viable treatment option to restore esthetics and function impaired by abnormally shaped teeth when a suitable donors tooth is available. This paper describes the autotransplantation and 2-year follow-up of a supernumerary maxillary incisor as a replacement to a misaligned maxillary incisor with abnormal crown morphology and size. The supernumerary incisor was immediately autotransplanted into the extraction site of the large incisor and was stabilized with a bonded semirigid splint for 2 weeks. Fixed orthodontic therapy was initiated 3 months after autotransplantation. Ideal alignment of the incisors was accomplished after 6 months along with radiographic evidence of apical closure and osseous/periodontal regeneration. In autogenous tooth transplantation, a successful clinical outcome can be achieved if the cases are selected and treated properly.

  12. Shading of ceramic crowns using digital tooth shade matching devices.

    Baltzer, A; Kaufmann-Jinoian, V

    2005-04-01

    In the 1990s, there was great optimism due to the development of devices for measuring tooth shade. The frequently not so simple, visual determination of the shade of a tooth was to be done with the aid of a device which recognizes the shade and describes it accurately by reference to a color chart. However, the skepticism towards such devices was also great. It is known that the color effect frequently differs strongly when comparing a tooth from the shade guide with a metal ceramic crown, despite identical shade designation. Anyone who considers visual shade determination to be inadequate and places his hopes in digital shade matching devices will be disappointed. It is the shade-generating structures of the metal ceramic and frequently of the veneer layers that turn out to be too thin which, despite correct shade selection, cause a different color perception. Such problems have been reduced decisively with the development of fracture-proof hard porcelain caps (Vita In-Ceram) with optical characteristics similar to teeth. In addition, the Vita System 3D-Master tooth shade system developed in 1998 by Vita in cooperation with Dr. Hall from Australia, leads the practitioner to a better understanding of the primary tooth shade characteristics of "brightness (value)", "color intensity (chroma)" and "color (wave length of the visible light, hue)". These two innovations allow a more accurate estimate of the basic shade of a natural tooth (reference tooth) and the imitation in the laboratory of its natural, shade-generating structures. If digital shade measurement supplements the visual shade estimate, then a further improvement can be expected--especially in the recognition of the basic shade. Qualitative descriptions of subjective shade measurement of a natural tooth and of its imitation in the dental laboratory by ceramics can be found frequently in professional journals and publications. With digital tooth shade matching devices, which apart from the color code of

  13. Evaluation of bleeding following dental extraction in patients on long-term antiplatelet therapy: A clinical trial

    K George Varghese

    2015-01-01

    Conclusion: Hence, we recommend routine single tooth extractions in patients on long-term antiplatelet medication, without interruption or alteration of their medication. Such patients do not have an increased risk of prolonged or excessive postoperative bleeding.

  14. Clinical evaluation of postradiation dental extraction

    Kusukawa, Jingo; Ohisi, Shinichiro; Kameyama, Tadamitsu; Yoshizumi, Munehiro; Hayabuchi, Naofumi [Kurume Univ., Fukuoka (Japan). School of Medicine

    1996-05-01

    Twenty-one patients who had undergone postradiation dental extraction were evaluated clinically. All patients had received irradiation for primary head and neck malignancies at doses ranging from 8 to 60 Gy (mean, 51.6 Gy). Time to dental extraction after irradiation ranged from 8 to 156 months (mean, 57.9 months). Of the 21 patients (80 teeth extracted, including 33 maxillary teeth and 47 mandibular teeth), one had delayed healing after wisdom tooth extraction due to postextraction irradiation. Thus, osteoradionecrosis after dental extraction did not develop. These results suggest that dental extraction after radiation is not contraindicated. To prevent complications, patients who have received radiation and require extractions should be cared for by oral and maxillofacial surgeons in close association with radiation oncologists. (author).

  15. In Vitro Color Change of Three Dental Veneering Resins in Tea, Coffee and Tamarind Extracts

    S. Muttagi

    2011-09-01

    Full Text Available Objective: To study the in vitro color changes of three dental resin veneering materials when immersed in tea, coffee and tamarind extracts.Materials and Methods: The color changes of heat polymerized tooth colored acrylic resin (Stellondetrey, B, F14, DPI Dental products of India Ltd, Mumbai, auto polymerized tooth colored acrylic resin (DPI, B, QV5, DPI Dental products of India Ltd, Mumbai andlight polymerized resin composite (Herculite XRV, Enamel A2, part no. 22860, lot no. 910437, Kerr Corporation, West Collins Avenue, Orange, CA, USA when immersed in water extracts of tea (Tata Tea Ltd. Bangalore, India, coffee (Tata Coffee Ltd. Coorg, Indiaand tamarind were evaluated using computer vision systems. The color images were recorded in R (red, G (green and B (blue form and converted into H (hue, S (saturationand V (value.Results: Significant color change occurred for auto polymerized tooth colored acrylic resin in tamarind extract, for heat polymerized tooth colored acrylic resin in tea extract andfor light polymerized resin composite in coffee extract. Auto polymerized tooth colored acrylic resin samples showed an overall higher color change. However, for all the material samples coffee extract produced more color change.Conclusion: These results suggest that the color stability of the resins is influenced by the presence of secondary metabolites such as tartaric acid, tannins, caffeine, saponins and phenols in tamarind, tea and coffee extracts.

  16. Root resorption during orthodontic tooth movements.

    Ramanathan, C; Hofman, Z

    2009-12-01

    The aim of the study was to compare the extent of maxillary incisor root resorption during different orthodontic tooth movements using three different techniques, namely the basal intrusion arch, the three component arch, and levelling of the upper dental arch with the straightwire appliance. The radiographs of 49 subjects (20 males and 29 females) with a mean age of 14.5 years were taken at two time points: in groups 1 and 2 after the levelling phase and in group 3 immediately after placement of the archwire (T1) and in all groups after a period of 6 months (T2). The amount of root resorption of the central incisors was determined at T2. The average incisor resorption was different in the three groups, with group 2 (three component arch) showing greater resorption (0.46 mm) than groups 1 (basal arch) and 3 (straightwire) of 0.26 and 0.25 mm, respectively. Analysis of variance (ANOVA) demonstrated that differences in root resorption in the three groups were not significant. Wilcoxon paired test showed that the root resorption occurring between T1 and T2 in the three groups was not significant. There was also no significant difference among the rates of resorption in the three groups. Grouping the subjects on the basis of the extent of root resorption and the biomechanics used showed differences in the percentage of subjects with the least (resorption between the three groups. This again showed that the technique of three component intrusion arch resulted in the greatest increase in root resorption.

  17. Malformations of the tooth root in humans

    Hans Ulrich eLuder

    2015-10-01

    Full Text Available The most common root malformations in humans arise from either developmental disorders of the root alone or disorders of radicular development as part of a general tooth dysplasia. The aim of this review is to relate the characteristics of these root malformations to potentially disrupted processes involved in radicular morphogenesis. Radicular morphogenesis proceeds under the control of Hertwig's epithelial root sheath (HERS which determines the number, length, and shape of the root, induces the formation of radicular dentin, and participates in the development of root cementum. Formation of HERS at the transition from crown to root development appears to be very insensitive to adverse effects, with the result that rootless teeth are extremely rare. In contrast, shortened roots as a consequence of impaired or prematurely halted apical growth of HERS constitute the most prevalent radicular dysplasia which occurs due to trauma and unknown reasons as well as in association with dentin disorders. While odontoblast differentiation inevitably stops when growth of HERS is arrested, it seems to be unaffected even in cases of severe dentin dysplasias such as regional odontodysplasia and dentin dysplasia type I. As a result radicular dentin formation is at least initiated and progresses for a limited time. The only condition affecting cementogenesis is hypophosphatasia which disrupts the formation of acellular cementum through an inhibition of mineralization. A process particularly susceptible to adverse effects appears to be the formation of the furcation in multirooted teeth. Impairment or disruption of this process entails taurodontism, single-rooted posterior teeth, and misshapen furcations. Thus even though many characteristics of human root malformations can be related to disorders of specific processes involved in radicular morphogenesis, precise inferences as to the pathogenesis of these dysplasias are hampered by the still limited knowledge on

  18. Accurate Modeling of the Spiral Bevel and Hypoid Gear with a New Tooth Profile

    LI Yun-song; ADAYI Xieeryazidan; DING Han

    2014-01-01

    Distinguishing with traditional tooth profile of spiral bevel and hypoid gear, it proposed a new tooth profile namely the spherical involute. Firstly, a new theory of forming the spherical involute tooth profile was proposed. Then, this theory was applied to complete parametric derivation of each part of its tooth profile. For enhancing the precision, the SWEEP method used for formation of each part of tooth surface and G1 stitching schema for obtaining a unified tooth surface are put forward and made the application in the accurate modeling. Lastly, owing to the higher accuracy of tooth surface of outputted model, it gave some optimization approaches. Given numerical example about the model can show that this designed gear with spherical involute tooth profile can achieve fast and accurate parametric modeling and provide a foundation for tooth contact analysis (TCA) in digitized design and manufacture.

  19. A Novel HA/β-TCP-Collagen Composite Enhanced New Bone Formation for Dental Extraction Socket Preservation in Beagle Dogs

    Ko-Ning Ho; Eisner Salamanca; Kuo-Chi Chang; Tsai-Chin Shih; Yu-Chi Chang; Haw-Ming Huang; Nai-Chia Teng; Che-Tong Lin; Sheng-Wei Feng; Wei-Jen Chang

    2016-01-01

    Past studies in humans have demonstrated horizontal and vertical bone loss after six months following tooth extraction. Many biomaterials have been developed to preserve bone volume after tooth extraction. Type I collagen serves as an excellent delivery system for growth factors and promotes angiogenesis. Calcium phosphate ceramics have also been investigated because their mineral chemistry resembles human bone. The aim of this study was to compare the performance of a novel bioresorbable pur...

  20. Effect of human bone morphogenetic protein 2 implant on tooth eruption in an experimental design.

    Steinberg, B; Chiego, D J; Huizinga, P J; Wozney, J M; Wikesjö, U M

    1999-07-01

    This study evaluated the influence of recombinant human bone morphogenetic protein 2 (rhBMP-2) on the development and eruption of the secondary dentition. Primary premolar tooth extraction sockets in 12 16-week-old felines were implanted with either rhBMP-2, in collagen sponge or with buffer/absorbable collagen sponge (ACS). Unoperated jaw quadrants served as controls. Experimental conditions were randomized between jaw quadrants in all animals. Two animals receiving rhBMP-2/ACS and buffer/ACS in two quadrants per implant were sacrificed at 4 weeks postsurgery. Ten animals receiving rhBMP-2/ACS (two quadrants), buffer/ACS implants (one quadrant), and one quadrant serving as an unoperated control were evaluated at 12 weeks postsurgery. Clinical assessments included healing, eruption patterns, and crown development. Radiographic assessments included tooth development, eruption patterns, and bone formation. Histological observations were also made from the 4-week animals. The secondary dentition remained unerupted at 4 weeks postsurgery. Histological analysis showed normal alveolar bone coronal to the erupting teeth in rhBMP-2/ACS-implanted quadrants. At 12 weeks postsurgery, all teeth were erupted without differences between quadrants. Clinically, the crowns of all teeth were normal. Radiographs suggested that teeth in rhBMP-2/ACS- and buffer/ACS-implanted jaw quadrants exhibited similar tooth development and eruption patterns as the normal control. The evidence from this study suggests that surgical implantation of rh-BMP-2/ACS in the pathway of the developing and erupting secondary dentition does not interfere with the normal development and eruption patterns of the teeth.

  1. Success Rate of Formocresol Pulpotomy versus Mineral Trioxide Aggregate in Human Primary Molar Tooth

    S E Jabbarifar

    2004-12-01

    Full Text Available Background: In spite of long time and broad use of formaldehyde derivates (Fixation agent in primary tooth pulp treatment, There is some concerns about these derivates such as variability, inconsistency success rate, mutagenicity, cytotoxicity, alergenicity, and some other potential health hazards of them. Therefore other alternative pulpotomy procedures like Bioactive glass (BAG, Glutaraldehyde (2%, Hydroxyappetite (HA, Bone dried freezed (BDF, ferric sulfate (15%, laser, Electrosurgery (ES, Bone Morphogenic proteins (BMP, recombinant protein-1 (RP1, and Mineral Trioxide Aggregate (MTA have been compared. The purpose of this clinical trial is to assess radiographic and clinical success rate of Formocresol (FC pulpotomy in compare with MTA in human primary molar teeth. Methods: 64 molars were pulpotomized equally and randomly with mineral trioxide Aggregate and Formocresol. Prior to trial, we defined a case as failure, when one or more of the events such as external root resorption, internal root resorption, periapical and furca lucency, pain, swelling, mobility, dental abscess, or early extraction appeared. Every treated tooth was defined as successful, if any noted evident was not shown. Results: Totally, 60 teeth treatment (92.2 percent were successful and 7.8 percent were failed. Failure and success rates for MTA group were 6.3 and 93.7 percent, respectively. Failure and success rates in FC group were 8.4 and 90.2 percent respectively. The difference between MTA and FC treatment methods was not significant (Fisher Exact test. Conclusion: Findings of this study show that mineral trioxide aggregate can be an alternative procedure for FC pulpotomy of primary tooth. Keywords: Mineral trioxide aggregate, formocresol, pulpotomy, success and failure rate.

  2. Single-Rooted Extraction Sockets: Classification and Treatment Protocol.

    El Chaar, Edgar; Oshman, Sarah; Fallah Abed, Pooria

    2016-09-01

    Clinicians have many treatment techniques from which to choose when extracting a failing tooth and replacing it with an implant-supported restoration and when successful management of an extraction socket during the course of tooth replacement is necessary to achieve predictable and esthetic outcomes. This article presents a straightforward, yet thorough, classification for extraction sockets of single-rooted teeth and provides guidance to clinicians in the selection of appropriate and predictable treatment. The presented classification of extraction sockets for single-rooted teeth focuses on the topography of the extraction socket, while the protocol for treatment of each socket type factors in the shape of the remaining bone, the biotype, and the location of the socket whether it be in the mandible or maxilla. This system is based on the biologic foundations of wound healing and can help guide clinicians to successful treatment outcomes.

  3. Periodontal response after tooth movement into intrabony defects.

    Polson, A; Caton, J; Polson, A P; Nyman, S; Novak, J; Reed, B

    1984-04-01

    The present study was undertaken since conflicting evidence exists regarding the effect of such tooth movement on levels of connective tissue attachment. Localized intrabony pockets were produced around isolated incisors in four rhesus monkeys. The root surfaces were planned to the level of the bone at the base of the angular bony defects. An oral hygiene regime was begun and continued for the remainder of the study. The experimental teeth were moved orthodontically into, and through, the original area of the intrabony defect. Two months after cessation of active tooth movement, block specimens were removed for histologic analysis. Control specimens comprised those teeth with induced periodontal defects, but without tooth movement. In specimens not subjected to tooth movement, angular bony defects were present and epithelium lined the root surface to the apical extent of instrumentation. The alveolar bone adjacent to the orthodontically moved teeth no longer had angular defect morphology. On the pressure side, epithelium lined the root surface, was interposed between root surface and bone and terminated at the apical limit of root instrumentation. On the tension side, the crest of the bone was located apical to the level of root planing, and epithelium lined the instrumented portion of the root surface. It was concluded that orthodontic tooth movement into intrabony periodontal defects was without effect upon the levels of connective tissue attachment.

  4. Implant-Root Proximity and Pulp Vitality of the Tooth

    Tasharoie

    2015-12-01

    Full Text Available Background When dental implants are applied in partially edentulous patients, there is the risk of placing the implants in close proximity or in direct contact with the adjacent roots. In this situation assurance of pulp vitality of the adjacent tooth is neessary. Objectives The current study aimed to assess pulp response of the tooth after root proximity with dental implant. Patients and Methods After investigating 2800 records of patients, 31 implants in 29 patients were included in this study. A parallel peri-apical radiography was taken and pulp vitality tests (cold, heat and electrical pulp tests were conducted for each patient. Results Among the 31 assessed implants and the adjacent intact teeth, 13 implants had direct contact and 18 implants had proximity of less than 1 mm with the adjacent root. All of the teeth had positive (normal pulp response to all tests. The most prevalent areas for proximity of implant-tooth were upper first premolar implants and upper canine teeth. The most approximation area was apical third of root of the teeth. Conclusions Based on the clinical and radiographic examinations, implant-tooth approximation (less than 1 mm or direct contact is not related to pulp vitality of the tooth. Further studies with larger sample sizes are necessary to confirm the results of the study.

  5. Jaw lesions associated with impacted tooth: A radiographic diagnostic guide

    Mortazavi, Hamed

    2016-01-01

    This review article aimed to introduce a category of jaw lesions associated with impacted tooth. General search engines and specialized databases such as Google Scholar, PubMed, PubMed Central, MedLine Plus, Science Direct, Scopus, and well-recognized textbooks were used to find relevant studies using keywords such as "jaw lesion", "jaw disease", "impacted tooth", and "unerupted tooth". More than 250 articles were found, of which approximately 80 were broadly relevant to the topic. We ultimately included 47 articles that were closely related to the topic of interest. When the relevant data were compiled, the following 10 lesions were identified as having a relationship with impacted tooth: dentigerous cysts, calcifying odontogenic cysts, unicystic (mural) ameloblastomas, ameloblastomas, ameloblastic fibromas, adenomatoid odontogenic tumors, keratocystic odontogenic tumors, calcifying epithelial odontogenic tumors, ameloblastic fibro-odontomas, and odontomas. When clinicians encounter a lesion associated with an impacted tooth, they should first consider these entities in the differential diagnosis. This will help dental practitioners make more accurate diagnoses and develop better treatment plans based on patients' radiographs. PMID:27672610

  6. Efficient transport of droplet sandwiched between saw-tooth plates.

    Wang, Liya; Wu, Hengan; Wang, Fengchao

    2016-01-15

    The transport of droplet sandwiched between smooth and saw-tooth plates was investigated using molecular dynamics method. The repeated opening and closing of the plates result in sequential stretching and squeezing of the droplet, which provide the driving force. The asymmetrical saw tooth obstructs the backward motion of the droplet, and gives rise to a net forward displacement of the droplet in every opening and closing cycle. This unidirectional motion facilitates the efficient droplet transport, which is referred to as the ratchet-like effect in this work. Our simulations also reveal that the influence of the surface wettability on the droplet transport is different for saw-tooth and smooth plates. Droplet transport efficiency exhibits monotonic decrease with the increase of the solid-liquid interactions for saw-tooth plates. While for smooth plates, unidirectional droplet movement was only observed for certain solid-liquid interactions. Taken together these simulation results and theoretical analysis, we demonstrate that hydrophobic saw-tooth plates can improve the transport efficiency significantly. These findings not only enhance our understanding of the droplet transport from atomistic scale, but also are beneficial to practical applications in designing of micro- and nano-fluidic systems.

  7. Canine tooth size and fitness in male mandrills (Mandrillus sphinx).

    Leigh, Steven R; Setchell, Joanna M; Charpentier, Marie; Knapp, Leslie A; Wickings, E Jean

    2008-07-01

    Sexual selection theory explains the evolution of exaggerated male morphologies and weaponry, but the fitness consequences of developmental and age-related changes in these features remain poorly understood. This long-term study of mandrill monkeys (Mandrillus sphinx) demonstrates how age-related changes in canine tooth weaponry and adult canine size correlate closely with male lifetime reproductive success. Combining long-term demographic and morphometric data reveals that male fitness covaries simply and directly with canine ontogeny, adult maximum size, and wear. However, fitness is largely independent of other somatometrics. Male mandrills sire offspring almost exclusively when their canines exceed approximately 30 mm, or two-thirds of average adult value (45 mm). Moreover, sires have larger canines than nonsires. The tooth diminishes through wear as animals age, corresponding with, and perhaps influencing, reproductive senescence. These factors combine to constrain male reproductive opportunities to a brief timespan, defined by the period of maximum canine length. Sexually-selected weaponry, especially when it is nonrenewable like the primate canine tooth, is intimately tied to the male life course. Our analyses of this extremely dimorphic species indicate that sexual selection is closely intertwined with growth, development, and aging, pointing to new directions for sexual selection theory. Moreover, the primate canine tooth has potential as a simple mammalian system for testing genetically-based models of aging. Finally, the tooth may record details of life histories in fossil primates, especially when sexual selection has played a role in the evolution of dimorphism.

  8. Jaw lesions associated with impacted tooth: A radiographic diagnostic guide

    Motazavi, Hamed; Bharvand, Maryam [Dept. of Oral Medicine, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran (Iran, Islamic Republic of)

    2016-09-15

    This review article aimed to introduce a category of jaw lesions associated with impacted tooth. General search engines and specialized databases such as Google Scholar, PubMed, PubMed Central, MedLine Plus, Science Direct, Scopus, and well-recognized textbooks were used to find relevant studies using keywords such as 'jaw lesion', 'jaw disease', 'impacted tooth', and 'unerupted tooth'. More than 250 articles were found, of which approximately 80 were broadly relevant to the topic. We ultimately included 47 articles that were closely related to the topic of interest. When the relevant data were compiled, the following 10 lesions were identified as having a relationship with impacted tooth: dentigerous cysts, calcifying odontogenic cysts, unicystic (mural) ameloblastomas, ameloblastomas, ameloblastic fibromas, adenomatoid odontogenic tumors, keratocystic odontogenic tumors, calcifying epithelial odontogenic tumors, ameloblastic fibro-odontomas, and odontomas. When clinicians encounter a lesion associated with an impacted tooth, they should first consider these entities in the differential diagnosis. This will help dental practitioners make more accurate diagnoses and develop better treatment plans based on patients' radiographs.

  9. Energy harvesting from mastication forces via a smart tooth

    Bani-Hani, Muath; Karami, M. Amin

    2016-04-01

    The batteries of the current pacing devices are relatively large and occupy over 60 percent of the size of pulse generators. Therefore, they cannot be placed in the subtle areas of human body. In this paper, the mastication force and the resulting tooth pressure are converted to electricity. The pressure energy can be converted to electricity by using the piezoelectric effect. The tooth crown is used as a power autonomous pulse generator. We refer to this envisioned pulse generator as the smart tooth. The smart tooth is in the form of a dental implant. A piezoelectric vibration energy harvester is designed and modeled for this purpose. The Piezoelectric based energy harvesters investigated and analyzed in this paper initially includes a single degree of freedom piezoelectric based stack energy harvester which utilizes a harvesting circuit employing the case of a purely resistive circuit. The next step is utilizing and investigating a bimorph piezoelectric beam which is integrated/embedded in the smart tooth implant. Mastication process causes the bimorph beam to buckle or return to unbuckled condition. The transitions results in vibration of the piezoelectric beam and thus generate energy. The power estimated by the two mechanisms is in the order of hundreds of microwatts. Both scenarios of the energy harvesters are analytically modeled. The exact analytical solution of the piezoelectric beam energy harvester with Euler-Bernoulli beam assumptions is presented. The electro-mechanical coupling and the geometric nonlinearities have been included in the model for the piezoelectric beam.

  10. The development of complex tooth shape in reptiles

    Oldrich eZahradnicek

    2014-02-01

    Full Text Available Reptiles have a diverse array of tooth shapes, from simple unicuspid to complex multicuspid teeth, reflecting functional adaptation to a variety of diets and eating styles. In addition to cusps, often complex longitudinal labial and lingual enamel crests are widespread and contribute to the final shape of reptile teeth. The simplest shaped unicuspid teeth have been found in piscivorous or carnivorous ancestors of recent diapsid reptiles and they are also present in some extant carnivores such as crocodiles and snakes. However, the ancestral tooth shape for squamate reptiles is thought to be bicuspid, indicating an insectivorous diet. The development of bicuspid teeth in lizards has recently been published, indicating that the mechanisms used to create cusps and crests are very distinct from those that shape cusps in mammals. Here, we introduce the large variety of tooth shapes found in lizards and compare the morphology and development of bicuspid, tricuspid and pentacuspid teeth, with the aim of understanding how such tooth shapes are generated. Next, we discuss whether the processes used to form such morphologies are conserved between divergent lizards and whether the underlying mechanisms share similarities with those of mammals. In particular, we will focus on the complex teeth of the chameleon, gecko, varanus and anole lizards using SEM and histology to compare the tooth crown morphology and embryonic development.

  11. Tooth regeneration: a revolution in stomatology and evolution in regenerative medicine

    2011-01-01

    A tooth is a complex biological organ and consists of multiple tissues including the enamel, dentin, cementum and pulp. Tooth loss is the most common organ failure. Can a tooth be regenerated? Can adult stem cells be orchestrated to regenerate tooth structures such as the enamel, dentin, cementum and dental pulp, or even an entire tooth? If not, what are the therapeutically viable sources of stem cells for tooth regeneration? Do stem cells necessarily need to be taken out of the body, and man...

  12. Ultrasonographic evaluation of periodontal changes during orthodontic tooth movement - work in progress

    ZIMBRAN, ADELA; DUDEA, DIANA; GASPARIK, CRISTINA; DUDEA, SORIN

    2017-01-01

    Background and aim Orthodontic tooth movement (OTM) is a process whereby the application of a force induces bone resorption on the pressure side and bone apposition on the tension side of the lamina dura. However, only limited data are available on the in vivo behavior of the periodontal tissues. The aim of this study was to assess the changes of periodontal tissues, induced by the orthodontic canine retraction, using 40 MHz ultrasonography. Methods Ultrasonographic evaluation of periodontal tissues was conducted in 5 patients with indication for orthodontic treatment. The upper first premolars were extracted bilaterally due to severe crowding, and the canines were distalized using elastomeric chain with a net force of 100 cN. Ultrasonographic scans (US scans) were performed before, during and after retraction, in three distinct areas of the canines buccal surface: mesial, middle and distal. The reference point was the bracket, which appeared hyperechoic on the US scan. Four different dimensions were obtained: D1 (depth of the sulcus), D2 (thickness of the gingiva), D3 (length of the supracrestal fibers), D4 (width of periodontal space). Results An increase of D1 was observed in all three areas of the periodontium, during orthodontic treatment. D3 was strongly correlated before and immediately after force delivery only for the mesial area (r=0.828, pmovement. Conclusion High-resolution ultrasonography has the capability to obviate changes in periodontal ligament space and free gingiva during orthodontic tooth movement. PMID:28246503

  13. Inflammatory response of human dental pulp to at-home and in-office tooth bleaching

    Maysa Magalhães Vaz

    Full Text Available ABSTRACT Tooth bleaching is a technique of choice to obtain a harmonious smile, but bleaching agents may damage the dental pulp. Objective: This study evaluated the inflammatory responses of human dental pulp after the use of two bleaching techniques. Material and Methods: Pulp samples were collected from human third molars extracted for orthodontic reasons and divided into three groups: control - no tooth bleaching (CG (n=7; at-home bleaching with 15% carbamide peroxide (AH (n = 10, and in-office bleaching with 38% hydrogen peroxide (IO (n=12. Pulps were removed and stained with hematoxylin-eosin for microscopic analysis of inflammation intensity, collagen degradation, and pulp tissue organization. Immunohistochemistry was used to detect mast cells (tryptase+, blood vessels (CD31+, and macrophages (CD68+. Chi-square, Kruskal-Wallis, and Mann Whitney tests were used for statistical analysis. The level of significance was set at p0.05. No mast cells were found in the pulp samples analyzed. Conclusion: In-office bleaching with 38% hydrogen peroxide resulted in more intense inflammation, higher macrophages migration, and greater pulp damage then at-home bleaching with 15% carbamide peroxide, however, these bleaching techniques did not induce migration of mast cells and increased the number of blood vessels.

  14. Clinical treatment and prognosis of tooth injury%牙创伤的临床治疗及预后

    卫粉兰; 籍增平; 邵海荣; 董晶; 沈艳

    2016-01-01

    Objective To analysis the type of teeth injury,discuss the treatments and the result of teeth injury. Method Select 204 cases of patients with 264 teeth injuried.Retrospective analyzing the diagnosis and the treatments of dental trauma,exploring the reason of tooth extraction for treatment failure. Results there are 171 male patients,93 female patients,182 adults,82 minors in 264 teeth injury.233 of those injuried teeth were healed well after root canal therapy,fixation,dental crown repair.54 were extracted,the rate of tooth extraction was 20.5%(54/264).The rate of tooth extraction in teeth with Crown and root fractured and replanted teeth were higher than that of concussion teeth and cracked teeth (P<0.05). Most of the reasons for tooth extraction was root resorption.. Conclusion It is significant in improving the therapeutic effect and reducing the rate of removal that applying appropriate treatment of early according to characteristics of different types of dental trauma.%目的:分析牙创伤的类型,讨论其治疗方法及效果。方法选择204例患者264颗创伤牙,回顾性分析其临床诊断情况、治疗方法及治疗失败牙拔除的原因。结果264颗创伤牙中男171颗,女93颗;成人182颗,未成年人年轻恒牙82颗;经根管治疗、固定及冠修复等治疗后,愈合良好210颗,拔除54颗,拔除率20.5%,冠根联合折牙及脱位再植牙拔除率高于震荡或隐裂牙、冠折牙(P<0.05),拔除原因多为根吸收。结论针对不同类型牙创伤的临床特点,尽早采用恰当的治疗方法,对提高治疗效果、降低拔除率有重要意义。

  15. Precise modeling of arc tooth face-gear with transition curve

    Cui Yanmei; Fang Zongde; Su Jinzhan; Feng Xianzhang; Peng Xianlong

    2013-01-01

    A fabrication method is adopted for which an imaginary gear simultaneously realizes conjugated meshing with an arc tooth cylindrical gear and an arc tooth face-gear. The cutter fillet and tooth crest edge form the tooth root fillet of the gear, and the linear tooth surface equation of the imaginary gear and the position vector of the curvature center of the cutter fillet are constructed with certain cutter inclination to deduce a working arc tooth surface equation. The tooth root fillet equation of the arc tooth face-gear is derived from the meshing geometry and kinematics. A numer-ically controlled machining model of the arc tooth face-gear is established through the transforma-tion of adjustment parameters from the cutter-tilt milling machine to a common multi-axis NC machine. Motion parameters of each movement axis of the NC machine are acquired. A processing example is presented to verify the precision of the fabrication method in processing the arc tooth face-gear. The method provides a theoretical and tentative basis for the analysis of tooth surface contact stress, tooth root bending stress and dynamics. A hobbing test is conducted to demonstrate the good meshing condition of the arc tooth face-gear pair.

  16. Stem cell-based biological tooth repair and regeneration.

    Volponi, Ana Angelova; Pang, Yvonne; Sharpe, Paul T

    2010-12-01

    Teeth exhibit limited repair in response to damage, and dental pulp stem cells probably provide a source of cells to replace those damaged and to facilitate repair. Stem cells in other parts of the tooth, such as the periodontal ligament and growing roots, play more dynamic roles in tooth function and development. Dental stem cells can be obtained with ease, making them an attractive source of autologous stem cells for use in restoring vital pulp tissue removed because of infection, in regeneration of periodontal ligament lost in periodontal disease, and for generation of complete or partial tooth structures to form biological implants. As dental stem cells share properties with mesenchymal stem cells, there is also considerable interest in their wider potential to treat disorders involving mesenchymal (or indeed non-mesenchymal) cell derivatives, such as in Parkinson's disease.

  17. Is a three-dimensional-printed tooth filling possible?

    Muhammet Kerim Ayar

    2016-01-01

    Full Text Available Introduction: Three-dimensional (3-D printing is seen as an innovative production process in many fields of dentistry and medicine. But implantation of this novel production process into the treatment of decayed teeth in dentistry remains lacking. Destruction of dental tissues as a result of dental caries is generally treated with dental resin composite fillings. However, a 3-D-printed tooth filling approach, which could be an alternative to traditional approaches, has a potential to reduce treatment costs and technique-sensitivity of the placement of restorative material. The Hypothesis: Here, the hypothesis that a 3-D-printed tooth filling approach could be an alternative to traditional approaches to treatment of decayed teeth is proposed. Evaluation of the Hypothesis: The actual implementation of the 3-D-printed tooth filling technique in the practice of restorative dentistry was discussed in this manuscript.

  18. Three-dimensional analysis of mandibular growth and tooth eruption

    Krarup, S.; Darvann, Tron Andre; Larsen, Per

    2005-01-01

    , relocated laterally during growth. Furthermore, the position of tooth buds remained relatively stable inside the jaw until root formation started. Eruption paths of canines and premolars were vertical, whereas molars erupted in a lingual direction. The 3D method would seem to offer new insight into jaw......Normal and abnormal jaw growth and tooth eruption are topics of great importance for several dental and medical disciplines. Thus far, clinical studies on these topics have used two-dimensional (2D) radiographic techniques. The purpose of the present study was to analyse normal mandibular growth...... and tooth eruption in three dimensions based on computer tomography (CT) scans, extending the principles of mandibular growth analysis proposed by Bjork in 1969 from two to three dimensions. As longitudinal CT data from normal children are not available (for ethical reasons), CT data from children...

  19. Molar tooth carbonates and benthic methane fluxes in Proterozoic oceans

    Shen, Bing; Dong, Lin; Xiao, Shuhai; Lang, Xianguo; Huang, Kangjun; Peng, Yongbo; Zhou, Chuanming; Ke, Shan; Liu, Pengju

    2016-01-01

    Molar tooth structures are ptygmatically folded and microspar-filled structures common in early- and mid-Proterozoic (~2,500-750 million years ago, Ma) subtidal successions, but extremely rare in rocks isotopes, we show that molar tooth structures may have formed within sediments where microbial sulphate reduction and methanogenesis converged. The convergence was driven by the abundant production of methyl sulphides (dimethyl sulphide and methanethiol) in euxinic or H2S-rich seawaters that were widespread in Proterozoic continental margins. In this convergence zone, methyl sulphides served as a non-competitive substrate supporting methane generation and methanethiol inhibited anaerobic oxidation of methane, resulting in the buildup of CH4, formation of degassing cracks in sediments and an increase in the benthic methane flux from sediments. Precipitation of crack-filling microspar was driven by methanogenesis-related alkalinity accumulation. Deep ocean ventilation and oxygenation around 750 Ma brought molar tooth structures to an end.

  20. Aesthetic rehabilitation in a patient with tooth wear

    Haroon Rashid

    2012-01-01

    Full Text Available This case report sheds light upon the procedural treatment of aesthetic oral rehabilitation in patients with tooth wear so that not only a specialist but also a general dental practitioner can easily tackle cases of this caliber. In this case report, the treatment of a 58-year-old man with aesthetics concerns, tooth wear, and sensitivity in anterior teeth is discussed. The need for a stabilizing splint, crown lengthening, and the provisioning of partial dentures in the upper and lower arches were all part of the treatment protocol in this case. The prevalence of tooth wear and the aesthetic demands of patients have increased in our society nowadays. When both of these problems are encountered together in the dental practice, strict treatment planning is needed to achieve success.

  1. Tooth development in Ambystoma mexicanum: phosphatase activities, calcium accumulation and cell proliferation in the tooth-forming tissues.

    Wistuba, Joachim; Ehmcke, Jens; Clemen, Günter

    2003-06-01

    Prerequisites of tooth formation, cell proliferation in the tooth-forming tissues, calcium accumulation and the enzymatic activities of alkaline (ALP) and acid phosphatases (ACP) were investigated by immunohistochemical and histochemical methods in various developmental stages of the Mexican Axolotl, Ambystoma mexicanum. During the growth of replacement teeth, the tooth-forming tissues continually recruit cells from the surrounding regions. The basal layer of the oral epithelium, the dental lamina and sometimes even the outer enamel epithelium provide cells for the differentiated inner enamel epithelium, in which the active ameloblasts are localized. The differentiating odontoblasts are derived from proliferating cells situated basally to the replacement teeth in the mesenchymal tissue. When differentiation has started and the cells have become functional, proliferative activity can no longer be observed. Calcium is accumulated close to the site of mineralization in the inner enamel epithelium and in the odontoblasts as it is in mammals, elasmobranchii and teleostei. The activities of ACP and ALP related to the mineralization of the replacement teeth are separated spatially and not sequentially as they are in mammals. However, the results indicate a similar function of these enzymatic components in relation to tooth formation and maturation of mineral deposition. Most of the substantial processes related to tooth formation reported from other vertebrates occur in a manner similar to that in Ambystoma mexicanum, but there also seem to be basic mechanisms present that are realised in a unique way in this urodele.

  2. Environmental lead pollution and its possible influence on tooth loss and hard dental tissue lesions

    Cenić-Milošević Desanka

    2013-01-01

    Full Text Available Bacground/Aim. Environmental lead (Pb pollution is a global problem. Hard dental tissue is capable of accumulating lead and other hard metals from the environment. The aim of this study was to investigate any correlation between the concentration of lead in teeth extracted from inhabitants of Pančevo and Belgrade, Serbia, belonging to different age groups and occurrence of tooth loss, caries and non-carious lesions. Methods. A total of 160 volunteers were chosen consecutively from Pančevo (the experimental group and Belgrade (the control group and divided into 5 age subgroups of 32 subjects each. Clinical examination consisted of caries and hard dental tissue diagnostics. The Decayed Missing Filled Teeth (DMFT Index and Significant Caries Index were calculated. Extracted teeth were freed of any organic residue by UV digestion and subjected to voltammetric analysis for the content of lead. Results. The average DMFT scores in Pančevo (20.41 were higher than in Belgrade (16.52; in the patients aged 31-40 and 41-50 years the difference was significant (p < 0.05 and highly significant in the patients aged 51-60 (23.69 vs 18.5, p < 0.01. Non-carious lesions were diagnosed in 71 (44% patients from Pančevo and 39 (24% patients from Belgrade. The concentrations of Pb in extracted teeth in all the groups from Pančevo were statistically significantly (p < 0.05 higher than in all the groups from Belgrade. In the patients from Pančevo correlations between Pb concentration in extracted teeth and the number of extracted teeth, the number of carious lesions and the number of non-carious lesions showed a statistical significance (p < 0.001, p < 0.01 and p < 0.001, respectively. Conclusion. According to correlations between lead concentration and the number of extracted teeth, number of carious lesions and non-carious lesions found in the patients living in Pančevo, one possible cause of tooth loss and hard dental tissue damage could be a long

  3. Generation of gear tooth surfaces by application of CNC machines

    Litvin, F. L.; Chen, N. X.

    1994-01-01

    This study will demonstrate the importance of application of computer numerically controlled (CNC) machines in generation of gear tooth surfaces with new topology. This topology decreases gear vibration and will extend the gear capacity and service life. A preliminary investigation by a tooth contact analysis (TCA) program has shown that gear tooth surfaces in line contact (for instance, involute helical gears with parallel axes, worm gear drives with cylindrical worms, etc.) are very sensitive to angular errors of misalignment that cause edge contact and an unfavorable shape of transmission errors and vibration. The new topology of gear tooth surfaces is based on the localization of bearing contact, and the synthesis of a predesigned parabolic function of transmission errors that is able to absorb a piecewise linear function of transmission errors caused by gear misalignment. The report will describe the following topics: description of kinematics of CNC machines with six degrees of freedom that can be applied for generation of gear tooth surfaces with new topology. A new method for grinding of gear tooth surfaces by a cone surface or surface of revolution based on application of CNC machines is described. This method provides an optimal approximation of the ground surface to the given one. This method is especially beneficial when undeveloped ruled surfaces are to be ground. Execution of motions of the CNC machine is also described. The solution to this problem can be applied as well for the transfer of machine tool settings from a conventional generator to the CNC machine. The developed theory required the derivation of a modified equation of meshing based on application of the concept of space curves, space curves represented on surfaces, geodesic curvature, surface torsion, etc. Condensed information on these topics of differential geometry is provided as well.

  4. Root canal treatment of mandibular second premolar tooth with taurodontism

    Vujašković Mirjana

    2008-01-01

    Full Text Available INTRODUCTION Taurodontism is a morphoanatomical change in the shape of a tooth. An enlarged body of a tooth with smaller than usual roots is a characteristic feature. Internal tooth anatomy correlates with this appearance, which means that a taurodontal tooth has a large pulp chamber and apically positioned furcations. This dental anomaly may be associated with different syndromes and congenital discoders. CASE OUTLINE The case report presents the patient of a rare case of taurodontism in the mandibular second premolar with chronic periodontitis. Endodontic treatment was performed after dental history and clinical examination. Special care is required in all segments of endodontic treatment of a taurodontal tooth from the identification orifice, canal exploration, determining working length, cleaning and shaping and obturation of the root canal. Precurved K-file was used for canal exploration and location of the furcation. One mesial and one distal canal with the buccal position were identified in the apical third of the root canal. The working lengths of two canals were determined by radiographic interpretation with two K-files in each canal and verified with the apex locator. During canal instrumentation, the third canal was located in the disto-lingual position. The working length of the third canal was established using the apex locator. CONCLUSION Thorough knowledge of tooth anatomy and its variations can lead to lower percentage of endodontic failure. Each clinical case involving these teeth should be investigated carefully, clinically and radiographically to detect additional root canals. High quality radiographs from different angles and proper instrumentarium improve the quality of endodontic procedure.

  5. Risk indicators for tooth loss in adult workers

    Marília Jesus Batista

    2012-10-01

    Full Text Available Tooth loss continues to be a prevalent condition in Brazilian adults and elderly individuals. The aim of this cross-sectional study, conducted among workers in a wholesale grocery chain in the State of São Paulo, was to identify risk indicators for tooth loss in adults. The presence of caries and periodontal status were examined in 387 adults aged 20-64 years, according to World Health Organization criteria. Two outcomes were analyzed: loss of one or more teeth, and loss of four or more teeth. Independent variables analyzed were demographic and socioeconomic factors, clinical conditions, use of dental services, and self-perceived oral health. Poisson regression models were used for multivariate statistical analysis. Participants were missing a mean of 5.38 teeth, and 76.9% (n = 297 had lost at least one tooth; the most frequently lost teeth were permanent molars. Older age and the presence of visible dental biofilm were associated significantly with the two tooth loss outcomes (p < 0.05. Individuals who had visited the dentist 3 or more years previously showed a lower prevalence of tooth loss (prevalence ratio = 0.79; 95% confidence interval, 0.68-0.91. Those with lower household incomes were significantly more likely to have lost four or more teeth (prevalence ratio = 1.35; 95% confidence interval, 1.07-1.70. Study results indicated that age and dental biofilm were risk indicators for tooth loss, independently of socioeconomic factors. These risk indicators should be considered when planning oral health programs for adults.

  6. Three dimensional mathematical model of tooth for finite element analysis

    Puškar Tatjana

    2010-01-01

    Full Text Available Introduction. The mathematical model of the abutment tooth is the starting point of the finite element analysis of stress and deformation of dental structures. The simplest and easiest way is to form a model according to the literature data of dimensions and morphological characteristics of teeth. Our method is based on forming 3D models using standard geometrical forms (objects in programmes for solid modeling. Objective. Forming the mathematical model of abutment of the second upper premolar for finite element analysis of stress and deformation of dental structures. Methods. The abutment tooth has a form of a complex geometric object. It is suitable for modeling in programs for solid modeling SolidWorks. After analyzing the literature data about the morphological characteristics of teeth, we started the modeling dividing the tooth (complex geometric body into simple geometric bodies (cylinder, cone, pyramid,.... Connecting simple geometric bodies together or substricting bodies from the basic body, we formed complex geometric body, tooth. The model is then transferred into Abaqus, a computational programme for finite element analysis. Transferring the data was done by standard file format for transferring 3D models ACIS SAT. Results. Using the programme for solid modeling SolidWorks, we developed three models of abutment of the second maxillary premolar: the model of the intact abutment, the model of the endodontically treated tooth with two remaining cavity walls and the model of the endodontically treated tooth with two remaining walls and inserted post. Conclusion Mathematical models of the abutment made according to the literature data are very similar with the real abutment and the simplifications are minimal. These models enable calculations of stress and deformation of the dental structures. The finite element analysis provides useful information in understanding biomechanical problems and gives guidance for clinical research.

  7. Sclerostin Promotes Bone Remodeling in the Process of Tooth Movement

    Shu, Rui; Bai, Ding; Sheu, Tzongjen; He, Yao; Yang, Xianrui; Xue, Chaoran; He, Yiruo; Zhao, Mengyuan; Han, Xianglong

    2017-01-01

    Tooth movement is a biological process of bone remodeling induced by mechanical force. Sclerostin secreted by osteocytes is mechanosensory and important in bone remodeling. However, little is known regarding the role of sclerostin in tooth movement. In this study, models of experimental tooth movement were established in rats and mice. Sclerostin expression was investigated with immunohistochemistry staining, and osteoclastic activity was analyzed with tartrate-resistant acid phosphatase (TRAP) staining. MLO-Y4 osteocyte-like cells underwent uniaxial compression and tension stress or were cultured in hypoxia conditions. Expression of sclerostin was assessed by RT-qPCR and ELISA. MLO-Y4 cells were cultured with recombinant human sclerostin (rhSCL) interference and then co-cultured with RAW264.7 osteoclast precursor cells. Expressions of RANKL and OPG were analyzed by RT-qPCR, and osteoclastic activity was assessed by TRAP staining. During tooth movement, sclerostin was expressed differently in compression and tension sites. In SOST knock-out mice, there were significantly fewer TRAP-positive cells than in WT mice during tooth movement in compression sites. In-vitro studies showed that the expression of sclerostin in MLO-Y4 osteocyte-like cells was not different under a uniaxial compression and tension force, whereas hypoxia conditions significantly increased sclerostin expression in MLO-Y4 cells. rhSCL interference increased the expression of RANKL and the RANKL/OPG ratio in MLO-Y4 cells and the osteoclastic induction ability of MLO-Y4 cells in experimental osteocyte-osteoclast co-culture. These data suggest that sclerostin plays an important role in the bone remodeling of tooth movement. PMID:28081119

  8. Mesenchymal stem cell-mediated functional tooth regeneration in swine.

    Wataru Sonoyama

    Full Text Available Mesenchymal stem cell-mediated tissue regeneration is a promising approach for regenerative medicine for a wide range of applications. Here we report a new population of stem cells isolated from the root apical papilla of human teeth (SCAP, stem cells from apical papilla. Using a minipig model, we transplanted both human SCAP and periodontal ligament stem cells (PDLSCs to generate a root/periodontal complex capable of supporting a porcelain crown, resulting in normal tooth function. This work integrates a stem cell-mediated tissue regeneration strategy, engineered materials for structure, and current dental crown technologies. This hybridized tissue engineering approach led to recovery of tooth strength and appearance.

  9. Mineral trioxide aggregate root canal filling of traumatized immature tooth

    Maha A Kanfar; Al-Nazhan, Saad A.

    2013-01-01

    An 8-year-old female patient reported to the dental clinic seeking a help to save her traumatized maxillary left central incisor. The tooth had been treated with a temporary filling by a general dentist. The coronal tooth structure was intact, discolored, and a temporary filling was placed on the access opening. She gave a history of trauma about 3 years back. An intraoral periapical radiograph revealed an open apex and dentin bridge in the middle of the root canal. The root canal and the acc...

  10. CBCT-Aided Multidisciplinary Approach to Salvaging an Intruded Tooth.

    Pamboo, Jaya; Hans, Manoj Kumar; Chander, Subhash; Kumar, Santosh; Chinna, Harleen

    2016-03-01

    Among the most severe types of traumatic dental injuries is intrusive luxation, which displaces the affected tooth deeper into the alveolus, causing significant damage to the pulp and all of the supporting structures. This article describes a unique case of intrusive luxation of the mature left maxillary central incisor in an 18-year-old male patient. The diagnosis was confirmed using cone-beam computed tomography (CBCT), after which the intruded tooth was successfully repositioned by endodontic and orthodontic management. This was followed by prosthodontic rehabilitation. This case report also discusses the role of CBCT in effectively diagnosing this type of injury.

  11. Melatonin Effects on Hard Tissues: Bone and Tooth

    Hong-Wen He

    2013-05-01

    Full Text Available Melatonin is an endogenous hormone rhythmically produced in the pineal gland under the control of the suprachiasmatic nucleus (SCN and the light/dark cycle. This indole plays an important role in many physiological processes including circadian entrainment, blood pressure regulation, seasonal reproduction, ovarian physiology, immune function, etc. Recently, the investigation and applications of melatonin in the hard tissues bone and tooth have received great attention. Melatonin has been investigated relative to bone remolding, osteoporosis, osseointegration of dental implants and dentine formation. In the present review, we discuss the large body of published evidence and review data of melatonin effects on hard tissues, specifically, bone and tooth.

  12. Mesenchymal stem cell-mediated functional tooth regeneration in swine.

    Sonoyama, Wataru; Liu, Yi; Fang, Dianji; Yamaza, Takayoshi; Seo, Byoung-Moo; Zhang, Chunmei; Liu, He; Gronthos, Stan; Wang, Cun-Yu; Wang, Songlin; Shi, Songtao

    2006-12-20

    Mesenchymal stem cell-mediated tissue regeneration is a promising approach for regenerative medicine for a wide range of applications. Here we report a new population of stem cells isolated from the root apical papilla of human teeth (SCAP, stem cells from apical papilla). Using a minipig model, we transplanted both human SCAP and periodontal ligament stem cells (PDLSCs) to generate a root/periodontal complex capable of supporting a porcelain crown, resulting in normal tooth function. This work integrates a stem cell-mediated tissue regeneration strategy, engineered materials for structure, and current dental crown technologies. This hybridized tissue engineering approach led to recovery of tooth strength and appearance.

  13. Metastatic mandibular neuroblastoma: a rare cause of tooth mobility.

    Kürklü, Esma; Emiroğlu, Halil Haldun; Kebudi, Rejin; Ozdaş, Didem Oner; Ayan, Inci; Görgün, Omer; Zülfikar, Bülent; Yekeler, Ensar; Gülsüm, A K

    2011-01-01

    Neuroblastoma (NBL), a malignant embryonic tumor derived from neural crest cells, is the most common tumor worldwide among children less than 1 year of age. Metastasis to the mandible is uncommon. This article reports the case of a 15-month-old male diagnosed with NBL with bone metastasis including the mandible which resulted in severe tooth mobility. Dentists or pediatricians should consider the primary or metastatic tumors of the maxillofacial region in the differential diagnosis in children presenting with premature loss of teeth related to tooth mobility.

  14. ANESTHESIA FOR CHARCOT-MARIE-TOOTH DISEASE: CASE REPORT.

    Alzaben, Khalid R; Samarah, Omar Q; Obeidat, Salameh S; Halhouli, Oday; Al Kharabsheh, Murad

    2016-06-01

    Charcot-Marie-Tooth disease comprises a group of disorders characterized by progressive muscle weakness and wasting. Reviewing the anaesthetic literature produced conflicting reports about the best anaesthetic options for patients with CMTD; as they are at increased risk of prolonged response to muscle relaxants, malignant hyperthermia and risks of regional anaesthesia. We present a case of the successful use of total intravenous anaesthesia with dexmedetomidine and propofol combined with caudal block using bupivacaine mixed with dexmedetomidine without any complications, for a 17 year old male patient with Charcot Marie-Tooth disease who underwent a lower limb orthopedic surgery.

  15. Tooth Supported Overdenture Retained with Custom Attachments: A Case Report.

    Bansal, Siddharth; Aras, Meena A; Chitre, Vidya

    2014-12-01

    Overdenture is a favored treatment modality for elderly patients with few remaining teeth. Roots maintained under the denture base preserve the alveolar ridge, provide sensory feedback and improve the stability of the dentures. Furthermore, the use of copings and precision attachments on the remaining teeth enhances the retention of the denture. This clinical report describes a novel method of fabricating a tooth supported overdenture retained with custom made ball attachments using orthodontic separators as a female component. Customized ball attachments with orthodontic separators are a simple and cost effective alternative treatment to the use of prefabricated attachments for enhancing the retention of tooth supported overdentures.

  16. [Surgical removing of an ectopic tooth in an Iceland mare].

    Dicht, S; Del Chicca, F; Fürst, A

    2011-12-01

    Ectopic teeth occur because of failure of the first branchial cleft to close during development and are found mostly in young horses. Such dentigerous cysts are often located at the base of the ear, forming a notable swelling with a fistula, as it was the case with the two year old Iceland mare «Runa». In order to confirm the diagnosis, x-ray images were taken, which is also necessary to locate the ectopic tooth correctly. While operating, the whole cystic membrane should be removed and it is important to prevent adjacent nerves and blood vessels from damage. Prognosis for complete healing after removing an ectopic tooth is excellent.

  17. Characterization of a human tooth with carious lesions using conventional and synchrotron radiation-based micro computed tomography

    Dziadowiec, Iwona; Beckmann, Felix; Schulz, Georg; Deyhle, Hans; Müller, Bert

    2014-09-01

    In a dental office, every day X rays of teeth within the oral cavity are obtained. Caries induces a mineral loss and, therefore, becomes visible by reduced X-ray absorption. The detailed spatial distribution of the mineral loss, however, is inaccessible in conventional dental radiology, since the dose for such studies is intolerable. As a consequence, such measurements can only be performed after tooth extraction. We have taken advantage of synchrotron radiation-based micro computed tomography to characterize a human tooth with a rather small, natural caries lesion and an artificially induced lesion provoked by acidic etching. Both halves of the tooth were separately visualized from 2400 radiographs recorded at the beam line P07 / PETRA III (HASYLAB at DESY, Hamburg, Germany) with an asymmetric rotation axis at photon energy of 45 keV. Because of the setup, one finds an energy shift in the horizontal plane, to be corrected. After the appropriate three-dimensional registration of the data with the ones of the same crown using the better accessible phoenix nanotom® m of General Electric, Wunstorf, Germany, one can determine the joint histogram, which enable to calibrate the system with the conventional X-ray source.

  18. Surgical Re-entry of an Intentionally Replanted Periodontally Compromised Tooth Treated with Platelet Rich Fibrin (PRF): Hopeless to Hopeful.

    Ryana, Haneet Kour; Srinath, Rashmi; Prakash, Shobha

    2016-06-01

    Intentional replantation is generally contraindicated in periodontally compromised teeth however, there are reports suggesting that it can be a successful treatment alternative for periodontally involved hopeless teeth. Currently there is dearth of evidence regarding the success of this therapy, especially evidence for the effectiveness of autologous platelet rich fibrin is lacking. We present a case report of a 23-year-old male patient with periodontally hopeless left maxillary central incisor having bone loss extending beyond root apex. The tooth was gently extracted and replanted utilizing root conditioning and combined regenerative therapy (Xenograft, PRF and Type I Collagen Membrane). Surgical re-entry at nine months revealed bone formation in the apical third of the tooth. At one year, 87% radiographic bone gain was accomplished. The improvement in the clinical and radiographic parameters reinforced by the re-entry surgery findings strongly suggest that intentional replantation may be a cost-effective substitute to implants and tooth supported prosthesis in situations where conventional periodontal therapy would yield compromised outcomes.

  19. Surgical Re-entry of an Intentionally Replanted Periodontally Compromised Tooth Treated with Platelet Rich Fibrin (PRF): Hopeless to Hopeful

    Srinath, Rashmi; Prakash, Shobha

    2016-01-01

    Intentional replantation is generally contraindicated in periodontally compromised teeth however, there are reports suggesting that it can be a successful treatment alternative for periodontally involved hopeless teeth. Currently there is dearth of evidence regarding the success of this therapy, especially evidence for the effectiveness of autologous platelet rich fibrin is lacking. We present a case report of a 23-year-old male patient with periodontally hopeless left maxillary central incisor having bone loss extending beyond root apex. The tooth was gently extracted and replanted utilizing root conditioning and combined regenerative therapy (Xenograft, PRF and Type I Collagen Membrane). Surgical re-entry at nine months revealed bone formation in the apical third of the tooth. At one year, 87% radiographic bone gain was accomplished. The improvement in the clinical and radiographic parameters reinforced by the re-entry surgery findings strongly suggest that intentional replantation may be a cost-effective substitute to implants and tooth supported prosthesis in situations where conventional periodontal therapy would yield compromised outcomes. PMID:27504421

  20. In vivo PIXE-PIGE study of enhanced retention of fluorine in tooth enamel after laser irradiation

    Demortier, Guy [Department of Physics, University of Namur, 61, rue de Bruxelles, B5000 Namur (Belgium)], E-mail: guy.demortier@tvcablenet.be; Nammour, Samir [Faculty of Medicine, University of Liege, 8, rue Paul Spaak, B-1000 Bruxelles (Belgium)

    2008-05-15

    The presence of fluoride in tooth enamel reduces the solubility of hydroxylapatite by acid attack. Fluoride presence (even at low concentration) in the oral cavity is efficient against caries process. We propose a new approach of the explanation of the increase of fluoride retention in the tooth enamel when low power laser irradiation is applied after the treatment with fluoride gel (fluoridation). External beam PIGE measurements of fluorine on extracted teeth have been made in order to determine the best sequence of the operations. The laser irradiation after fluoride application is more efficient than the reverse procedure. This observation is in agreement with previous observations that the fluorine penetration in the enamel takes place first in the soft organic material present between the polycrystalline (prismatic) structure before being integrated in the crystalline composition of hydroxylapatite in order to produce fluoro-apatite. As those in vitro measurements do not reflect the whole process in the saliva, in vivo PIGE measurements have been also performed. We have demonstrated, by repeating the PIGE measurements (at least five times at various time intervals) that a significant increase of the fluoride retention took place even 18 months after the unique laser treatment. The complete experimental procedure is described: fluoride application, laser irradiation, PIGE measurements with 2.7 MeV protons (repeated measurements at the same place on the same tooth in order to follow the evolution) and safety tests before in vivo analyses.