Characterization of papillomavirus E1 helicase mutants defective for interaction with the SUMO-conjugating enzyme Ubc9

International Nuclear Information System (INIS)

Fradet-Turcotte, Amelie; Brault, Karine; Titolo, Steve; Howley, Peter M.; Archambault, Jacques

2009-01-01

The E1 helicase from BPV and HPV16 interacts with Ubc9 to facilitate viral genome replication. We report that HPV11 E1 also interacts with Ubc9 in vitro and in the yeast two-hybrid system. Residues in E1 involved in oligomerization (353-435) were sufficient for binding to Ubc9 in vitro, but the origin-binding and ATPase domains were additionally required in yeast. Nuclear accumulation of BPV E1 was shown previously to depend on its interaction with Ubc9 and sumoylation on lysine 514. In contrast, HPV11 and HPV16 E1 mutants defective for Ubc9 binding remained nuclear even when the SUMO pathway was inhibited. Furthermore, we found that K514 in BPV E1 and the analogous K559 in HPV11 E1 are not essential for nuclear accumulation of E1. These results suggest that the interaction of E1 with Ubc9 is not essential for its nuclear accumulation but, rather, depends on its oligomerization and binding to DNA and ATP.

Digital dentistry: promise, reality and the role of software standards

NARCIS (Netherlands)

Benalouane, A.; Bakker, Q.; Wismeijer, D.; Genuchten, M.

2011-01-01

Up until now, dentistry was mostly carried out in the "analogue" world: X-rays were examined on film, patient information was recorded on paper, impressions were poured in plaster to create models, models were waxed and physical dental articulators were used. Today, certain steps of the process can

A Paradigm shift in the concept for making dental impressions.

Science.gov (United States)

Nayar, Sanjna; Mahadevan, R

2015-04-01

Digital dental impression is a revolutionary technological advancement that so surpasses the accuracy and efficiency of former techniques for obtaining replicas of prepared teeth for the purpose of fabricating restorations that its adoption by dentists is rapidly eclipsing the use of elastomeric impression materials. The ultimate goals of dentists dedicated to quality restorative dentistry are to make their treatment of patients as accurate, stressless, and efficient as possible. By elimination of the everyday problems described above, there is no question that the significant advantages of digital impressions will make intraoral digital scanning standard procedure in most dental offices within the next several years. Furthermore, digital impressions have proven to reduce remakes and returns, as well as increase overall efficiency. The patient also benefits by being provided a far more positive experience. Finally, through the use of digital impression making, it has been determined that laboratory products become more consistent and require less chair time at insertion.

A Paradigm shift in the concept for making dental impressions

Directory of Open Access Journals (Sweden)

Sanjna Nayar

2015-01-01

Full Text Available Digital dental impression is a revolutionary technological advancement that so surpasses the accuracy and efficiency of former techniques for obtaining replicas of prepared teeth for the purpose of fabricating restorations that its adoption by dentists is rapidly eclipsing the use of elastomeric impression materials. The ultimate goals of dentists dedicated to quality restorative dentistry are to make their treatment of patients as accurate, stressless, and efficient as possible. By elimination of the everyday problems described above, there is no question that the significant advantages of digital impressions will make intraoral digital scanning standard procedure in most dental offices within the next several years. Furthermore, digital impressions have proven to reduce remakes and returns, as well as increase overall efficiency. The patient also benefits by being provided a far more positive experience. Finally, through the use of digital impression making, it has been determined that laboratory products become more consistent and require less chair time at insertion.

Dentistry: Careers in Dentistry

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... in Dentistry e-mail Print Share Careers in Dentistry A dental education opens up a world of ... accredited training programs in your area . Careers in Dentistry Be a Dentist General Dentistry Dental Specialties Dental ...

Accuracy of 3 different impression techniques for internal connection angulated implants.

Science.gov (United States)

Tsagkalidis, George; Tortopidis, Dimitrios; Mpikos, Pavlos; Kaisarlis, George; Koidis, Petros

2015-10-01

Making implant impressions with different angulations requires a more precise and time-consuming impression technique. The purpose of this in vitro study was to compare the accuracy of nonsplinted, splinted, and snap-fit impression techniques of internal connection implants with different angulations. An experimental device was used to allow a clinical simulation of impression making by means of open and closed tray techniques. Three different impression techniques (nonsplinted, acrylic-resin splinted, and indirect snap-fit) for 6 internal-connected implants at different angulations (0, 15, 25 degrees) were examined using polyether. Impression accuracy was evaluated by measuring the differences in 3-dimensional (3D) position deviations between the implant body/impression coping before the impression procedure and the coping/laboratory analog positioned within the impression, using a coordinate measuring machine. Data were analyzed by 2-way ANOVA. Means were compared with the least significant difference criterion at Pimpression technique exhibited a higher accuracy than the other techniques studied when increased implant angulations at 25 degrees were involved. Copyright © 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

A clinical report on the use of closed-tray, hex-lock-friction-fit implant impression copings.

Science.gov (United States)

Raviv, Eli; Hanna, Jan; Raviv, Roy; Harel-Raviv, Mili

2014-08-01

The precision of an impression determines the subsequent accuracy and fit of the final restoration. Therefore, the ultimate search is for the most accurate impression material and the most efficient and least time consuming technique. One of the major debates in implant dentistry has focused on the advantages of the pick-up versus the transfer impression technique. The pick-up technique is widely accepted as the more accurate. However, the conventional transfer technique is simpler and less time consuming. The Hex-Lock-Friction-Fit impression coping (AB Dental Devices) combines the advantages of the transfer impression technique and the pick-up impression technique. In this article we will review the relevant literature, discuss the advantages of this unique implant impression technique, and present some related clinical cases.

Recent advances in dental optics - Part I: 3D intraoral scanners for restorative dentistry

Science.gov (United States)

Logozzo, Silvia; Zanetti, Elisabetta M.; Franceschini, Giordano; Kilpelä, Ari; Mäkynen, Anssi

2014-03-01

Intra-oral scanning technology is a very fast-growing field in dentistry since it responds to the need of an accurate three-dimensional mapping of the mouth, as required in a large number of procedures such as restorative dentistry and orthodontics. Nowadays, more than 10 intra-oral scanning devices for restorative dentistry have been developed all over the world even if only some of those devices are currently available on the market. All the existing intraoral scanners try to face with problems and disadvantages of traditional impression fabrication process and are based on different non-contact optical technologies and principles. The aim of this publication is to provide an extensive review of existing intraoral scanners for restorative dentistry evaluating their working principles, features and performances.

Can we measure patients' perception during dental impressions? The Burdens in Dental Impression-Making Questionnaire - BiDIM-Q.

Science.gov (United States)

Tsirogiannis, Panagiotis; Neophytou, Sophia; Reul, Anika; Heydecke, Guido; Reissmann, Daniel R

2017-01-01

To develop a reliable and valid instrument for the comprehensive assessment of patients' burdens during dental impression making, the Burdens in Dental Impression Making Questionnaire, BiDIM-Q. The item pool was generated in a convenience sample of 20 prosthodontic patients using semi-structured face-to-face interviews. The final instrument was tested in 145 consecutively recruited patients, and psychometric properties of the BiDIM-Q were determined. Four different impression materials were used according to the manufacturers' instructions and indications: alginate, c-silicone, polyvinylsiloxane, and polyether. The final BiDIM-Q consisting of 12 items showed sufficient reliability, indicated by Cronbach's alpha of .82 and an average inter-item correlation of .29. Validity was supported by Pearson correlation coefficients for the correlation between the instrument's total score with the patients' overall satisfaction rating (r=.63), and by the correlation matrix for the correlations of the patients' perceptions with the practitioners' satisfaction ratings. Overall, patient perceived burdens were low with highest burdens observed when using polyether in partially dentate patients for pick-up impressions, while lowest burdens were reported when using c-silicone for impressions of edentulous jaws. The BiDIM-Q is a reliable and valid tool for assessing patient-based process-related quality of care in dentistry allowing a deeper insight into patients' perspective during dental impression making. Copyright © 2016 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.

The Utilization of Additional Cassava Starch (Manihot Utilisima) for Alginate Dental Impression Material

OpenAIRE

Ali Noerdin; Bambang Irawan; Mirna Febriani

2003-01-01

In Indonesia alginate which is a common impression material used in dentistry is still imported. Since the economic crisis in 1998 the alginate price becoming four times more expensive. This situation resulted in efforts to modify the commercial alginate as had been conducted by a dentist in South Sumatera province in Indonesia. He who had added cassava starch into the commercial alginate used to make partial denture impression. The aim of this research is to investigate the effect of additio...

Knockdown of UbcH10 Enhances the Chemosensitivity of Dual Drug Resistant Breast Cancer Cells to Epirubicin and Docetaxel

Directory of Open Access Journals (Sweden)

Cheng Wang

2015-03-01

Full Text Available Breast cancer is one of the most common and lethal cancers in women. As a hub gene involved in a diversity of tumors, the ubiquitin-conjugating enzyme H10 (UbcH10, may also play some roles in the genesis and development of breast cancer. In the current study, we found that the expression of UbcH10 was up-regulated in some breast cancer tissues and five cell lines. We established a dual drug resistant cell line MCF-7/EPB (epirubicin/TXT (docetaxel and a lentiviral system expressing UbcH10 shRNA to investigate the effects of UbcH10 knockdown on the chemosensitivity of MCF-7/EPB/TXT cells to epirubicin and docetaxel. The knockdown of UbcH10 inhibited the proliferation of both MCF-7 and MCF-7/EPB/TXT cells, due to the G1 phase arrest in cell cycle. Furthermore, UbcH10 knockdown increased the sensitivity of MCF-7/EPB/TXT cells to epirubicin and docetaxel and promoted the apoptosis induced by these two drugs. Protein detection showed that, in addition to inhibiting the expression of Ki67 and cyclin D1, UbcH10 RNAi also impaired the increased BCL-2 and MDR-1 expression levels in MCF-7/EPB/TXT cells, which may contribute to abating the drug resistance in the breast cancer cells. Our research in the current study demonstrated that up-regulation of UbcH10 was involved in breast cancer and its knockdown can inhibit the growth of cancer cells and increase the chemosensitivity of the dual drug resistant breast cancer cells to epirubicin and docetaxel, suggesting that UbcH10 may be a promising target for the therapy of breast cancer.

Accuracy of a self-perforating impression tray for dental implants.

Science.gov (United States)

Marotti, Juliana; Tortamano, Pedro; Castilho, Tatiana R R N; Steagall, Washington; Wolfart, Stefan; Haselhuhn, Klaus

2014-10-01

Difficulties are involved in impression making with conventional open impression trays. The purpose of this study was to evaluate the accuracy of transferring implant impressions with a self-perforating impression tray. A reference model of a mandible was fabricated, and 4 implants were placed in the regions of the first premolars and lateral incisors (implants 1, 2, 3, 4). Ten impressions of the reference model with polyvinyl siloxane were made for each group; control (conventional open impression tray) and test (self-perforating impression tray; Miratray Implant). A metal bar was screw-retained on implant 1, and the gaps generated at the vestibular face of implants 3 and 4 were measured by optical microcopy. The 2-way ANOVA and least square difference post hoc test were used (α=.05). Higher mean (±SD) values were obtained for the test group than for the control group for both implants: implant 3: 150 ±84 μm for the test group, 73 ±63 μm for the control group (P=.019); implant 4: 129 ±65 μm for the test group, 62 ±61 μm for the control group (P=.04). The self-perforating impression tray provided less accuracy than the conventional open tray. Copyright © 2014 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

A rare allergy to a polyether dental impression material.

Science.gov (United States)

Mittermüller, Pauline; Szeimies, Rolf-Markus; Landthaler, Michael; Schmalz, Gottfried

2012-08-01

Polyether impression materials have been used in dentistry for more than 40 years. Allergic reactions to these materials such as reported in the 1970s ceased after replacement of a catalyst. Very recently, however, patients have started to report symptoms that suggest a new allergic reaction from polyether impression materials. Here, we report on the results of allergy testing with polyether impression materials as well as with its components. Eight patients with clinical symptoms of a contact allergy (swelling, redness or blisters) after exposure to a polyether impression material were subjected to patch tests, two of them additionally to a prick test. A further patient with atypical symptoms of an allergy (nausea and vomiting after contact with a polyether impression material in the oral cavity) but with a history of other allergic reaction was also patch tested. The prick tests showed no immediate reactions in the two patients tested. In the patch tests, all eight patients with typical clinical symptoms showed positive reactions to the mixed polyether impression materials, to the base paste or to a base paste component. The patient with the atypical clinical symptoms did not show any positive patch test reactions. Polyether impression materials may evoke type IV allergic reactions. The causative agent was a component of the base paste. In consideration of the widespread use of this impression material (millions of applications per year) and in comparison to the number of adverse reactions from other dental materials, the number of such allergic reactions is very low. In very scarce cases, positive allergic reactions to polyether impression materials are possible.

Preliminary Results of a Multicentre Study of the UBC Rapid Test for Detection of Urinary Bladder Cancer.

Science.gov (United States)

Ecke, Thorsten H; Arndt, Christian; Stephan, Carsten; Hallmann, Steffen; Lux, Oliver; Otto, Thomas; Ruttloff, Jürgen; Gerullis, Holger

2015-05-01

UBC Rapid is a test detecting fragments of cytokeratins 8 and 18 in urine. These are cytokeratins frequently overexpressed in tumor cells. We present the first results of a multi-centre study using UBC Rapid in patients with bladder cancer and healthy controls. Clinical urine samples from 92 patients with tumors of the urinary bladder (45 low-grade and 47 high-grade tumors) and from 33 healthy controls were used. Urine samples were analyzed by the UBC Rapid point-of-care (POC) system and evaluated both visually and quantitatively using a concile Omega 100 POC reader. For visual evaluation, different thresholds of band intensity for considering a test as positive were applied. Sensitivities and specificities were calculated by contingency analyses. We found that pathological concentrations by UBC Rapid are detectable in urine of patients with bladder cancer. The calculated diagnostic sensitivity of UBC Rapid in urine was 68.1% for high-grade, but only 46.2% for low-grade tumors. The specificity was 90.9%. The area under the curve (AUC) after receiver-operated curve (ROC) analysis was 0.733. Pathological levels of UBC Rapid in urine are higher in patients with bladder cancer in comparison to the control group (pbladder cancer and controls. Further studies with a greater number of patients will show how valuable these results are. Copyright© 2015 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.

Cellular Ubc2/Rad6 E2 ubiquitin-conjugating enzyme facilitates tombusvirus replication in yeast and plants

International Nuclear Information System (INIS)

Imura, Yoshiyuki; Molho, Melissa; Chuang, Chingkai; Nagy, Peter D.

2015-01-01

Mono- and multi-ubiquitination alters the functions and subcellular localization of many cellular and viral proteins. Viruses can co-opt or actively manipulate the ubiquitin network to support viral processes or suppress innate immunity. Using yeast (Saccharomyces cerevisiae) model host, we show that the yeast Rad6p (radiation sensitive 6) E2 ubiquitin-conjugating enzyme and its plant ortholog, AtUbc2, interact with two tombusviral replication proteins and these E2 ubiquitin-conjugating enzymes could be co-purified with the tombusvirus replicase. We demonstrate that TBSV RNA replication and the mono- and bi-ubiquitination level of p33 is decreased in rad6Δ yeast. However, plasmid-based expression of AtUbc2p could complement both defects in rad6Δ yeast. Knockdown of UBC2 expression in plants also decreases tombusvirus accumulation and reduces symptom severity, suggesting that Ubc2p is critical for virus replication in plants. We provide evidence that Rad6p is involved in promoting the subversion of Vps23p and Vps4p ESCRT proteins for viral replicase complex assembly. - Highlights: • Tombusvirus p33 replication protein interacts with cellular RAD6/Ubc2 E2 enzymes. • Deletion of RAD6 reduces tombusvirus replication in yeast. • Silencing of UBC2 in plants inhibits tombusvirus replication. • Mono- and bi-ubiquitination of p33 replication protein in yeast and in vitro. • Rad6p promotes the recruitment of cellular ESCRT proteins into the tombusvirus replicase

Cellular Ubc2/Rad6 E2 ubiquitin-conjugating enzyme facilitates tombusvirus replication in yeast and plants

Energy Technology Data Exchange (ETDEWEB)

Imura, Yoshiyuki, E-mail: imura@brs.nihon-u.ac.jp; Molho, Melissa; Chuang, Chingkai; Nagy, Peter D., E-mail: pdnagy2@uky.edu

2015-10-15

Mono- and multi-ubiquitination alters the functions and subcellular localization of many cellular and viral proteins. Viruses can co-opt or actively manipulate the ubiquitin network to support viral processes or suppress innate immunity. Using yeast (Saccharomyces cerevisiae) model host, we show that the yeast Rad6p (radiation sensitive 6) E2 ubiquitin-conjugating enzyme and its plant ortholog, AtUbc2, interact with two tombusviral replication proteins and these E2 ubiquitin-conjugating enzymes could be co-purified with the tombusvirus replicase. We demonstrate that TBSV RNA replication and the mono- and bi-ubiquitination level of p33 is decreased in rad6Δ yeast. However, plasmid-based expression of AtUbc2p could complement both defects in rad6Δ yeast. Knockdown of UBC2 expression in plants also decreases tombusvirus accumulation and reduces symptom severity, suggesting that Ubc2p is critical for virus replication in plants. We provide evidence that Rad6p is involved in promoting the subversion of Vps23p and Vps4p ESCRT proteins for viral replicase complex assembly. - Highlights: • Tombusvirus p33 replication protein interacts with cellular RAD6/Ubc2 E2 enzymes. • Deletion of RAD6 reduces tombusvirus replication in yeast. • Silencing of UBC2 in plants inhibits tombusvirus replication. • Mono- and bi-ubiquitination of p33 replication protein in yeast and in vitro. • Rad6p promotes the recruitment of cellular ESCRT proteins into the tombusvirus replicase.

Rapid prototyping: An innovative technique in dentistry

Directory of Open Access Journals (Sweden)

Shakeba Quadri

2017-01-01

Full Text Available Emergence of advanced digital technology has opened up new perspectives for design and production in the field of dentistry. Rapid prototyping (RP is a technique to quickly and automatically construct a three-dimensional (3D model of a part or product using 3D printers or stereolithography machines. RP has various dental applications, such as fabrication of implant surgical guides, zirconia prosthesis and molds for metal castings, maxillofacial prosthesis and frameworks for fixed and removable partial dentures, wax patterns for the dental prosthesis and complete denture. Rapid prototyping presents fascinating opportunities, but the process is difficult as it demands a high level of artistic skill, which means that the dental technicians should be able to work with the models obtained after impression to form a mirror image and achieve good esthetics. This review aims to focus on various RP methods and its application in dentistry.

A clinical report on the use of closed tray, hex-lock-friction-fit implant impression copings.

Science.gov (United States)

Raviv, Eli; Hana, Jan; Raviv, Roy; Harel-Raviv, Mili

2012-04-17

Abstract AbstractThe precision of an impression determines the subsequent accuracy and fit of thefinal restoration. Therefore, the ultimate search is for the most accurate impressionmaterial and technique that is also the most efficient and least time consuming. One ofthe major debates in implant dentistry has been between the pick up versus the transferimpression technique. The pick up technique is widely accepted as the more accurate.However, the conventional transfer technique is simpler and less time consuming. TheHex-Lock-Friction-Fit impression coping (AB Dental Devices®) combines theadvantages of both the transfer impression technique and the pick up impressiontechnique. In this article we will review the relevant literature, discuss the advantages ofthis unique implant impression technique and present some related clinical cases.

Usefulness of Bladder Tumour Antigen (BTA) and Urinary Bladder Cancer test (UBC) in Transitional Cell Bladder Cancer (TCC) diagnosis and follow-up

International Nuclear Information System (INIS)

Nuvoli, S.; Spanu, A.; Masia, A.; Mulas, A.; Falchi, A.; Solinas, M.E.; Marrosu, A.; Madeddu, G.; Mocci, A.

2002-01-01

Aim: We evaluated BTA and UBC clinical utility in TCC diagnosis and follow-up. Materials and Methods: We enrolled consecutively 96 untreated TCC, 73 other genitourinary carcinomas (OC), 106 benign genitourinary diseases (BD) and 75 normal controls (C). After trans-urethral resection (TUR), TCC were classified by clinical staging (9 Ta, 27 T1, 32 T2, 20 T3 and 8 T4) and pathological grading (14 G1, 28 G2, 41 G3 and 13 G4). Urine BTA and UBC were assayed by monoclonal antibody methods, IEMA and IRMA, respectively (cut-off:14 U/ml and 8 μg/l, respectively). Results: Sensitivity, specificity, PPV, NPV and accuracy were 83.6%, 75.1%, 64.6%, 89.% and 72.4%, respectively for BTA and 53.1%, 89.4%, 72.8%, 78% and 75.6%, respectively for UBC. BTA and UBC specificities were determined combining OC and BD data, although UBC reached the highest value in OC (93.15%). Sensitivity and specificity differences between the two markers were significant (p<0.00001). BTA and UBC sensitivity and mean values significantly increased with progressive staging and grading. Moreover, marker levels were significantly higher in TCC compared to OC, BD and C. Seventy-one high stage and/or grade TCC underwent radical cystectomy, while 25 were monitored after TUR (14 cases: group A) or segmental cystectomy (11 cases: group B) for 8-32 months by periodical clinical examination, cystoscopy and urinary BTA and UBC assays. During follow-up, 9 group A cases developed recurrences and 5 were NED. BTA was elevated in 8/9 cases (88.8%) with recurrence, while borderline in the remaining one. UBC was above cut-off in 6/9 cases (66.6%) all with high BTA, while low in the remaining 3, confirming first observation data. Both marker increases preceded by several months the cystoscopic evidence of recurrence. In NED patients, BTA was low in all cases (100%), while UBC was under cut-off in 4/5 cases (80%) and slightly high in the remaining asymptomatic patient. Ten group B patients developed local recurrences

Overexpression of the E2 ubiquitin-conjugating enzyme UbcH10 causes chromosome missegregation and tumor formation.

NARCIS (Netherlands)

Ree, J.H.; Jeganathan, K.B.; Malureanu, L.; Deursen, J.M.A. van

2010-01-01

The anaphase-promoting complex/cyclosome (APC/C) E3 ubiquitin ligase functions with the E2 ubiquitin-conjugating enzyme UbcH10 in the orderly progression through mitosis by marking key mitotic regulators for destruction by the 26-S proteasome. UbcH10 is overexpressed in many human cancer types and

Accuracy of different abutment level impression techniques in All-On-4 dental implants

Directory of Open Access Journals (Sweden)

Marzieh Alikhasi

2012-01-01

Full Text Available Background and Aims: Passive fit of prosthetic frameworks is a major concern in implant dentistry. Impression technique is one of the several variables that may affect the outcome of dental implants. The purpose of this study was to compare the three dimensional accuracy of direct and indirect abutment level implant impressions ofALL-ON-4 treatment plan.Materials and Methods: A reference acrylic resin model with four Branemark fixtures was made according to All-On-4 treatment plan. Multiunit abutments were screwed into the fixtures and two special trays were made for direct and indirect impression techniques. Ten direct and ten indirect impression techniques with respective impression transfers were made. Impressions were poured with stone and the positional accuracy of the abutment analogues in each dimension of x, y, and z axes and also angular displacement (Δθ were evaluated using a Coordinate Measuring Machine (CMM. Data were analyzed using T- test.Results: The results showed that direct impression technique was significantly more accurate than indirect technique (P<0.001.Conclusion: The results showed that the accuracy of direct impression technique was significantly more than that of indirect technique in Δθ and Δr coordinate and also Δx, Δy, Δz.

Dental impressions using 3D digital scanners: virtual becomes reality.

Science.gov (United States)

Birnbaum, Nathan S; Aaronson, Heidi B

2008-10-01

The technologies that have made the use of three-dimensional (3D) digital scanners an integral part of many industries for decades have been improved and refined for application to dentistry. Since the introduction of the first dental impressioning digital scanner in the 1980s, development engineers at a number of companies have enhanced the technologies and created in-office scanners that are increasingly user-friendly and able to produce precisely fitting dental restorations. These systems are capable of capturing 3D virtual images of tooth preparations, from which restorations may be fabricated directly (ie, CAD/CAM systems) or fabricated indirectly (ie, dedicated impression scanning systems for the creation of accurate master models). The use of these products is increasing rapidly around the world and presents a paradigm shift in the way in which dental impressions are made. Several of the leading 3D dental digital scanning systems are presented and discussed in this article.

Selected applications for current polymers in prosthetic dentistry - state of the art.

Science.gov (United States)

Kawala, Maciej; Smardz, Joanna; Adamczyk, Lukasz; Grychowska, Natalia; Wieckiewicz, Mieszko

2018-05-10

Polymers are widely applied in medicine, including dentistry, i.e. in prosthodontics. The following paper is aimed at demonstrating the applications of selected modern polymers in prosthetic dentistry based on the reported literature. The study was conducted using the PubMed, SCOPUS and CINAHL databases in relation to documents published during 1999-2017. The following keywords were used: polymers with: prosthetic dentistry, impression materials, denture base materials, bite registration materials, denture soft liners, occlusal splint materials and 3D printing. Original papers and reviews which were significant from the modern clinical viewpoint and practical validity in relation to the possibility of using polymeric materials in prosthetic dentistry, were presented. Denture base materials were most commonly modified polymers. Modifications mainly concerned antimicrobial properties and reinforcement of the material structure by introducing additional fibers. Antimicrobial modifications were also common in case of relining materials. Polymeric materials have widely been used in prosthetic dentistry. Modifications of their composition allow achieving new, beneficial properties that affect quality of patients' life. Progress in science allows for a more methodologically-advanced research on the synthesis of new polymeric materials and incorporation of new substances into already known polymeric materials, that will require systematization and appropriate classification. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.org.

Ectopic expression of ubiquitin-conjugating enzyme gene from wild rice, OgUBC1, confers resistance against UV-B radiation and Botrytis infection in Arabidopsis thaliana

International Nuclear Information System (INIS)

Jeon, En Hee; Pak, Jung Hun; Kim, Mi Jin; Kim, Hye Jeong; Shin, Sang Hyun; Lee, Jai Heon; Kim, Doh Hoon; Oh, Ju Sung; Oh, Boung-Jun; Jung, Ho Won; Chung, Young Soo

2012-01-01

Highlights: ► We isolated a novel E2 ubiquitin-conjugating enzyme from leaves of wild rice plants. ► The OgUBC1 was highly expressed in leaves treated with SA and UV-B radiation. ► The recombinant OgUBC1 has an enzymatic activity of E2 in vitro. ► The OgUBC1 could protect disruption of plant cells by UV-B radiation. ► OgUBC1 confers disease resistance and UV-B tolerance in transgenic Arabidopsis plants. -- Abstract: A previously unidentified gene encoding ubiquitin-conjugating enzyme was isolated from leaves of wild rice plant treated with wounding and microbe-associated molecular patterns. The OgUBC1 gene was composed of 148 amino acids and contained a typical active site and 21 ubiquitin thioester intermediate interaction residues and 4 E3 interaction residues. Both exogenous application of salicylic acid and UV-B irradiation triggered expression of OgUBC1 in leaves of wild rice. Recombinant OgUBC1 proteins bound to ubiquitins in vitro, proposing that the protein might act as E2 enzyme in planta. Heterologous expression of the OgUBC1 in Arabidopsis thaliana protected plants from cellular damage caused by an excess of UV-B radiation. A stable expression of chalcone synthase gene was detected in leaves of OgUBC1-expressing Arabidopsis, resulting in producing higher amounts of anthocyanin than those in wild-type Col-0 plants. Additionally, both pathogenesis-related gene1 and 5 were transcribed in the transgenic Arabidopsis in the absence of pathogen infection. The OgUBC1-expressing plants were resistant to the infection of Botrytis cinerea. Taken together, we suggested that the OgUBC1 is involved in ubiquitination process important for cellular response against biotic and abiotic stresses in plants.

Ectopic expression of ubiquitin-conjugating enzyme gene from wild rice, OgUBC1, confers resistance against UV-B radiation and Botrytis infection in Arabidopsis thaliana

Energy Technology Data Exchange (ETDEWEB)

Jeon, En Hee; Pak, Jung Hun; Kim, Mi Jin; Kim, Hye Jeong [Department of Genetic Engineering, Dong-A University, Busan 604-714 (Korea, Republic of); Shin, Sang Hyun [National Crop Experiment Station, Rural Development Administration, Suwon 441-100 (Korea, Republic of); Lee, Jai Heon; Kim, Doh Hoon; Oh, Ju Sung [Department of Genetic Engineering, Dong-A University, Busan 604-714 (Korea, Republic of); Oh, Boung-Jun [BioControl Center, Jeonnam 516-942 (Korea, Republic of); Jung, Ho Won, E-mail: hwjung@dau.ac.kr [Department of Genetic Engineering, Dong-A University, Busan 604-714 (Korea, Republic of); Chung, Young Soo, E-mail: chungys@dau.ac.kr [Department of Genetic Engineering, Dong-A University, Busan 604-714 (Korea, Republic of)

2012-10-19

Highlights: Black-Right-Pointing-Pointer We isolated a novel E2 ubiquitin-conjugating enzyme from leaves of wild rice plants. Black-Right-Pointing-Pointer The OgUBC1 was highly expressed in leaves treated with SA and UV-B radiation. Black-Right-Pointing-Pointer The recombinant OgUBC1 has an enzymatic activity of E2 in vitro. Black-Right-Pointing-Pointer The OgUBC1 could protect disruption of plant cells by UV-B radiation. Black-Right-Pointing-Pointer OgUBC1 confers disease resistance and UV-B tolerance in transgenic Arabidopsis plants. -- Abstract: A previously unidentified gene encoding ubiquitin-conjugating enzyme was isolated from leaves of wild rice plant treated with wounding and microbe-associated molecular patterns. The OgUBC1 gene was composed of 148 amino acids and contained a typical active site and 21 ubiquitin thioester intermediate interaction residues and 4 E3 interaction residues. Both exogenous application of salicylic acid and UV-B irradiation triggered expression of OgUBC1 in leaves of wild rice. Recombinant OgUBC1 proteins bound to ubiquitins in vitro, proposing that the protein might act as E2 enzyme in planta. Heterologous expression of the OgUBC1 in Arabidopsis thaliana protected plants from cellular damage caused by an excess of UV-B radiation. A stable expression of chalcone synthase gene was detected in leaves of OgUBC1-expressing Arabidopsis, resulting in producing higher amounts of anthocyanin than those in wild-type Col-0 plants. Additionally, both pathogenesis-related gene1 and 5 were transcribed in the transgenic Arabidopsis in the absence of pathogen infection. The OgUBC1-expressing plants were resistant to the infection of Botrytis cinerea. Taken together, we suggested that the OgUBC1 is involved in ubiquitination process important for cellular response against biotic and abiotic stresses in plants.

Estrogen receptor alpha and nuclear factor Y coordinately regulate the transcription of the SUMO-conjugating UBC9 gene in MCF-7 breast cancer cells.

Science.gov (United States)

Ying, Shibo; Dünnebier, Thomas; Si, Jing; Hamann, Ute

2013-01-01

UBC9 encodes a protein that conjugates small ubiquitin-related modifier (SUMO) to target proteins thereby changing their functions. Recently, it was noted that UBC9 expression and activity play a role in breast tumorigenesis and response to anticancer drugs. However, the underlying mechanism is poorly understood. To investigate the transcriptional regulation of the UBC9 gene, we identified and characterized its promoter and cis-elements. Promoter activity was tested using luciferase reporter assays. The binding of transcription factors to the promoter was detected by chromatin immunoprecipitation (ChIP), and their functional role was confirmed by siRNA knockdown. UBC9 mRNA and protein levels were measured by quantitative reverse transcription PCR and Western blot analysis, respectively. An increased expression of UBC9 mRNA and protein was found in MCF-7 breast cancer cells treated with 17β-estradiol (E2). Analysis of various deletion mutants revealed a 137 bp fragment upstream of the transcription initiation site to be sufficient for reporter gene transcription. Mutations of putative estrogen receptor α (ER-α) (one imperfect estrogen response element, ERE) and/or nuclear factor Y (NF-Y) binding sites (two CCAAT boxes) markedly reduced promoter activity. Similar results were obtained in ER-negative MDA-MB-231 cells except that the ERE mutation did not affect promoter activity. Additionally, promoter activity was stimulated upon E2 treatment and overexpression of ER-α or NF-YA in MCF-7 cells. ChIP confirmed direct binding of both transcription factors to the UBC9 promoter in vivo. Furthermore, UBC9 expression was diminished by ER-α and NF-Y siRNAs on the mRNA and protein levels. In conclusion, we identified the proximal UBC9 promoter and provided evidence that ER-α and NF-Y regulate UBC9 expression on the transcriptional level in response to E2 in MCF-7 cells. These findings may contribute to a better understanding of the regulation of UBC9 in ER

2013 Alan Blizzard Award Feature Article--Enriching Educational Experiences through UBC's First Year Seminar in Science (SCIE113)

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Fox, Joanne; Birol, Gülnur; Han, Andrea; Cassidy, Alice; Nakonechny, Joanne; Berger, Jim; Peacock, Simon; Samuels, Lacey

2014-01-01

The First Year Seminar in Science (SCIE113) was developed during 2009/2010 academic year through an exemplary collaboration between faculty, administrators and educational support staff in the Faculty of Science at the University of British Columbia (UBC). SCIE113 reflects the vision and values of the Faculty of Science and UBC by offering an…

Estrogen receptor alpha and nuclear factor Y coordinately regulate the transcription of the SUMO-conjugating UBC9 gene in MCF-7 breast cancer cells.

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Shibo Ying

Full Text Available UBC9 encodes a protein that conjugates small ubiquitin-related modifier (SUMO to target proteins thereby changing their functions. Recently, it was noted that UBC9 expression and activity play a role in breast tumorigenesis and response to anticancer drugs. However, the underlying mechanism is poorly understood. To investigate the transcriptional regulation of the UBC9 gene, we identified and characterized its promoter and cis-elements. Promoter activity was tested using luciferase reporter assays. The binding of transcription factors to the promoter was detected by chromatin immunoprecipitation (ChIP, and their functional role was confirmed by siRNA knockdown. UBC9 mRNA and protein levels were measured by quantitative reverse transcription PCR and Western blot analysis, respectively. An increased expression of UBC9 mRNA and protein was found in MCF-7 breast cancer cells treated with 17β-estradiol (E2. Analysis of various deletion mutants revealed a 137 bp fragment upstream of the transcription initiation site to be sufficient for reporter gene transcription. Mutations of putative estrogen receptor α (ER-α (one imperfect estrogen response element, ERE and/or nuclear factor Y (NF-Y binding sites (two CCAAT boxes markedly reduced promoter activity. Similar results were obtained in ER-negative MDA-MB-231 cells except that the ERE mutation did not affect promoter activity. Additionally, promoter activity was stimulated upon E2 treatment and overexpression of ER-α or NF-YA in MCF-7 cells. ChIP confirmed direct binding of both transcription factors to the UBC9 promoter in vivo. Furthermore, UBC9 expression was diminished by ER-α and NF-Y siRNAs on the mRNA and protein levels. In conclusion, we identified the proximal UBC9 promoter and provided evidence that ER-α and NF-Y regulate UBC9 expression on the transcriptional level in response to E2 in MCF-7 cells. These findings may contribute to a better understanding of the regulation of UBC9 in ER

Antimicrobial Property of Hydrocolloid Impression Material Incorporated with Silver Nanoparticles Against Staphylococcus Aureus

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Wangchuk Norbu Penden

2017-01-01

Full Text Available Dental impressions can easily become contaminated with patient’s blood and saliva which are capable of transmitting infectious diseases to dental personnel. The addition of antimicrobial agents into impression materials could be effective in reducing the chances of cross-infection. Silver nanoparticles have been applied in dentistry as a potent antimicrobial agent. This study aims to evaluate the in vitro antimicrobial efficacy of silver nanoparticles incorporated to irreversible hydrocolloid impression material against Staphylococcus aureus. Silver nanoparticles (AgZrPO4, National Direct Network Company, Thailand at concentrations of 0.25%, 0.50%, 1.00% and 1.50% w/w were added to powder of impression materials (Kromopan, Lascod, Ilaty. Impression material samples were prepared on sterile plate in accordance with manufacturer’s instruction. After setting, a 100 microliter of S. aureus ATCC6538 suspension (106 cells/mL were inoculated on the surface of the impression sample and left for 10 minutes. The amount of S. aureus on the surface was quantified using imprint technique on Mannitol Salt agar. Impression materials incorporated with AgZrPO4 showed antimicrobial property against S. aureus (up to 95% reduction compared with control (impression material without AgZrPO4. Even though the mechanism of antimicrobial action was not clearly understood, AgZrPO4 incorporated to impression material was demonstrated to possess an inhibitory effect against pathogenic bacteria. Further studies are needed to investigate physical properties of the material and the clinical usage.

Digital versus conventional impressions for fixed prosthodontics: A systematic review and meta-analysis.

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Chochlidakis, Konstantinos M; Papaspyridakos, Panos; Geminiani, Alessandro; Chen, Chun-Jung; Feng, I Jung; Ercoli, Carlo

2016-08-01

Limited evidence is available for the marginal and internal fit of fixed dental restorations fabricated with digital impressions compared with those fabricated with conventional impressions. The purpose of this systematic review was to compare marginal and internal fit of fixed dental restorations fabricated with digital techniques to those fabricated using conventional impression techniques and to determine the effect of different variables on the accuracy of fit. Medline, Cochrane, and EMBASE databases were electronically searched and enriched by hand searches. Studies evaluating the fit of fixed dental restorations fabricated with digital and conventional impression techniques were identified. Pooled data were statistically analyzed, and factors affecting the accuracy of fit were identified, and their impact on accuracy of fit outcomes were assessed. Dental restorations fabricated with digital impression techniques exhibited similar marginal misfit to those fabricated with conventional impression techniques (P>.05). Both marginal and internal discrepancies were greater for stone die casts, whereas digital dies produced restorations with the smallest discrepancies (Pdigital impression was used to generate stereolithographic (SLA)/polyurethane dies, misfit values were intermediate. The fabrication technique, the type of restoration, and the impression material had no effect on misfit values (P>.05), whereas die and restoration materials were statistically associated (Pdigital impression technique provided better marginal and internal fit of fixed restorations than conventional techniques did. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

MEL-18 interacts with HSF2 and the SUMO E2 UBC9 to inhibit HSF2 sumoylation.

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Zhang, Jie; Goodson, Michael L; Hong, Yiling; Sarge, Kevin D

2008-03-21

In a previous study we found that sumoylation of the DNA-binding protein heat shock factor 2 (HSF2) is up-regulated during mitosis, but the mechanism that mediates this regulation was unknown. Here we show that HSF2 interacts with the polycomb protein MEL-18, that this interaction decreases during mitosis, and that overexpression and RNA interference-mediated reduction of MEL-18 result in decreased and increased HSF2 sumoylation, respectively. Other results suggest that MEL-18 may also function to inhibit the sumoylation of other cellular proteins. The results also show that MEL-18 is able to interact with the small ubiquitin-like modifier (SUMO) ubiquitin carrier protein (E2) enzyme UBC9 and that MEL-18 inhibits the ability of UBC9 to transfer the SUMO protein to target proteins. Together, the results in this work suggest a mechanism in which MEL-18 bound to HSF2 inhibits its sumoylation by binding to and inhibiting the activity of UBC9 enzymes in the vicinity of HSF2. These results provide an explanation for how mitotic HSF2 sumoylation is regulated and suggest that MEL-18, in contrast to the sumoylation-stimulating activities of the polycomb protein PC2, actually functions like an anti-SUMO ubiquitin-protein isopeptide ligase (E3), interacting both with HSF2 and the SUMO E2 UBC9 but acting to inhibit UBC9 activity to decrease sumoylation of a target protein, in this case that of HSF2.

Experimental study on the use of spacer foils in two-step putty and wash impression procedures using silicone impression materials.

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Mann, Karsten; Davids, Andreas; Range, Ursula; Richter, Gert; Boening, Klaus; Reitemeier, Bernd

2015-04-01

The 2-step putty and wash impression technique is commonly used in fixed prosthodontics. However, cutting sluiceways to allow the light-body material to drain is time-consuming. A solution might be the use of a spacer foil. The purpose of this study was to evaluate the influence of spacer foil on the margin reproduction and dimensional accuracy of 2-step putty and wash impressions. Two methods of creating space for the wash material in a 2-step putty and wash impression were compared: the traditional cutout technique and a spacer foil. Eleven commercially available combinations of silicone impression materials were included in the study. The impressions and the cast production were carried out under standardized conditions. All casts were measured with a 3-dimensional (3D) coordinate measuring machine. Preparation margin reproduction and the diameters and spacing of the stone cast dies were measured (α=.05). The 2 methods showed significant differences (P<.05) in the reproduction of the preparation margins (complete reproduction cutout, 90% to 98%; foil, 74% to 91%). The use of a foil resulted in greater dimensional accuracy of the cast dies compared to the cutout technique. Cast dies from the cutout technique were significantly smaller than the metallic original cast (cutout median, 4.55 mm to 4.61 mm; foil median, 4.61 to 4.64). Spacing between the dies revealed only a few additional significant differences between the techniques. When spacer foils were used, dies were obtained that better corresponded to the original tooth. Copyright © 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

A sectional-splinting technique for impressing multiple implant units by eliminating the use of an open tray

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Suryakant C. Deogade

2014-01-01

Full Text Available Since the inception of root form implant dentistry by P-I Branemark in the early 1980′s, so many technical advances have been put forward by several authors. However, the open tray impression technique is still performed for impressing multiple implant fixtures as it was first described in the original Branemark procedure manual. The most critical aspect for a successful implant-supported restoration is the passive and an accurate fit of superstructures to avoid preload and loading stresses. Splinting impression technique in multiple implants has gained popularity. Auto-polymerizing acrylic resin is among the most routinely practiced splinting material for multiple implant units. However, unfortunately, it exhibits shrinkage, which makes an impression quite inaccurate. This case report presents the solution to minimize the shrinkage of resin by utilizing sectional-splinting technique as advocated in the previous implant literature.

In vivo precision of conventional and digital methods of obtaining complete-arch dental impressions.

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Ender, Andreas; Attin, Thomas; Mehl, Albert

2016-03-01

Digital impression systems have undergone significant development in recent years, but few studies have investigated the accuracy of the technique in vivo, particularly compared with conventional impression techniques. The purpose of this in vivo study was to investigate the precision of conventional and digital methods for complete-arch impressions. Complete-arch impressions were obtained using 5 conventional (polyether, POE; vinylsiloxanether, VSE; direct scannable vinylsiloxanether, VSES; digitized scannable vinylsiloxanether, VSES-D; and irreversible hydrocolloid, ALG) and 7 digital (CEREC Bluecam, CER; CEREC Omnicam, OC; Cadent iTero, ITE; Lava COS, LAV; Lava True Definition Scanner, T-Def; 3Shape Trios, TRI; and 3Shape Trios Color, TRC) techniques. Impressions were made 3 times each in 5 participants (N=15). The impressions were then compared within and between the test groups. The cast surfaces were measured point-to-point using the signed nearest neighbor method. Precision was calculated from the (90%-10%)/2 percentile value. The precision ranged from 12.3 μm (VSE) to 167.2 μm (ALG), with the highest precision in the VSE and VSES groups. The deviation pattern varied distinctly according to the impression method. Conventional impressions showed the highest accuracy across the complete dental arch in all groups, except for the ALG group. Conventional and digital impression methods differ significantly in the complete-arch accuracy. Digital impression systems had higher local deviations within the complete arch cast; however, they achieve equal and higher precision than some conventional impression materials. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Direct 3-D morphological measurements of silicone rubber impression using micro-focus X-ray CT.

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Kamegawa, Masayuki; Nakamura, Masayuki; Fukui, Yu; Tsutsumi, Sadami; Hojo, Masaki

2010-01-01

Three-dimensional computer models of dental arches play a significant role in prosthetic dentistry. The microfocus X-ray CT scanner has the advantage of capturing precise 3D shapes of deep fossa, and we propose a new method of measuring the three-dimensional morphology of a dental impression directly, which will eliminate the conversion process to dental casts. Measurement precision and accuracy were evaluated using a standard gage comprised of steel balls which simulate the dental arch. Measurement accuracy, standard deviation of distance distribution of superimposed models, was determined as +/-0.050 mm in comparison with a CAD model. Impressions and casts of an actual dental arch were scanned by microfocus X-ray CT and three-dimensional models were compared. The impression model had finer morphology, especially around the cervical margins of teeth. Within the limitations of the current study, direct three-dimensional impression modeling was successfully demonstrated using microfocus X-ray CT.

Survey of Bacterial and Fungal Contaminations in Iranian Alginate, Foreign Alginate and Speedex Used for Impression in Dentistry

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Abbas Falah Tafti

2012-02-01

Full Text Available Background and Aims: Since impression materials usually contact with saliva, blood, and oral soft tissues, their microbial contamination are harmful in immunocompromised patients. The aim of the present study was to determine the bacterial and fungal contamination in common impression materials. Materials and Methods: In current lab trial study, 5 different samples from each 4 impression materials were homogenized in 1 ml Tween 80 and then 100µl of each sample were cultured onto blood agar, EMB, or sabouraud dextrose agar. Bacterial and fungal cultures were incubated at 37º C and 30º C, respectively. The isolated bacterial and fungal colonies were enumerated and identified using specific diagnostic media and tests. Data were analyzed using Kruskal-Wallis test. Results: Totally 75% of samples had one or several bacterial contaminations. Iranian alginate and Speedex (putty were the most contaminated samples. On the other hand, Speedex (light body and foreign alginate showed lower contamination. Species of Micrococcus, Staphylococcus, Bacilluses, Corynebacteria, gram negative Citrobacter, Actinomycetes and Neisseria were isolated from the analyzed impression materials. Aspergillus, Penicillium, Alternaria, Cladosporium and Sepdonium were the fungi isolated from impression materials. Statistical significant difference was shown between bacterial contamination of Iranian and foreign alginates (P=0.001. There was no statistical significant differences between the bacterial and fungal isolated colonies (CFU/gr of 4 tested impression materials (P=0.21. Conclusion: Several opportunistic bacteria and fungi were isolated from impression materials especially from Iranian alginate and Speedex putty which indicated their contamination.

An evaluation of student and clinician perception of digital and conventional implant impressions.

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Lee, Sang J; Macarthur, Robert X; Gallucci, German O

2013-11-01

perform for the student group than the clinician group; however, the difficulty level of the digital impression was the same in both groups. It was also determined that the student group preferred the digital impression as the most efficient impression technique, and the clinician group had an even distribution in the choice of preferred and efficient impression techniques. Copyright © 2013 Editorial Council for the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

Exposure of Seventh and Eighth Grade Urban Youth to Dentistry and Oral Health Careers.

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Mayberry, Melanie E; Young, Deirdre D; Sawilowsky, Shlomo; Hoelscher, Diane

2018-01-01

While pipeline programs for students from underrepresented minority groups have been established at the high school and college levels, fewer programs have been developed for middle school students. In an effort to reach this cohort, the University of Detroit Mercy School of Dentistry embarked on a grassroots collaborative pipeline program with two distinct segments: Urban Impressions and Dental Imprint. Their purpose is to expose Detroit-area seventh and eighth grade students to careers in dentistry, provide oral health education, and introduce role models. The aim of this pilot study was to determine outcomes for the middle school participants in Urban Impressions (n=86) and Dental Imprint (n=68). Both segments featured hands-on dental activities at the dental school. Outcomes were assessed by pretest-posttest surveys. Across the three cohorts, a total of 86 students participated in one or more sessions, with 57 completing the pre- and post-program surveys, for a 66% response rate. The results showed that the Dental Imprint respondents' knowledge of oral health, dental admissions, and specialties increased by an average 26% over three years. The gain in knowledge for each cohort was statistically significant (pdentistry as a career following the program. These results suggest that the two segments of this program are meeting their goals of increasing middle grade students' awareness of oral health professions including dentistry and providing access to role models. Institutions may benefit from the description of strategies used by this program to address challenges related to establishing early pipeline programs.

Clinical characteristics of an allergic reaction to a polyether dental impression material.

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Rafael, Caroline Freitas; Liebermann, Anja

2017-04-01

Allergic and hypersensitivity reactions to dental impression materials may occur throughout dental treatment, with diverse manifestations from slight redness to severe pain and a burning mouth with total stomatitis. Patients are often unaware of these allergic reactions, which makes early identification of the cause almost impossible. In addition, symptoms usually begin after 24 hours and mostly in patients with a preexisting history of allergic responses. This report describes a patient with a suspected allergic reaction to a polyether dental impression material during prosthetic rehabilitation associated with a mandibular telescopic denture. Although instances of such occurrence are rare, clinicians need to be aware of these symptoms and select materials carefully for patients with a history of allergy. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Randomized controlled within-subject evaluation of digital and conventional workflows for the fabrication of lithium disilicate single crowns. Part I: digital versus conventional unilateral impressions.

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Benic, Goran I; Mühlemann, Sven; Fehmer, Vincent; Hämmerle, Christoph H F; Sailer, Irena

2016-11-01

Trials comparing the overall performance of fully digital and conventional workflows in reconstructive dentistry are needed. The purpose of the first part of this randomized controlled clinical trial was to determine whether optical impressions produce different results from conventional impressions with respect to time efficiency and patient and operator perceptions of the clinical workflow. Three digital impressions and 1 conventional impression were made in each of 10 participants according to a randomly generated sequence. The digital systems were Lava COS, iTero, and Cerec Bluecam. The conventional impression was made with the closed-mouth technique and polyvinyl siloxane material. The time needed for powdering, impressions, and interocclusal record was recorded. Patient and clinician perceptions of the procedures were rated by means of visual analog scales. The paired t test with Bonferroni correction was applied to detect differences (α=.05/6=.0083). The mean total working time ±standard deviation amounted to 260 ±66 seconds for the conventional impression, 493 ±193 seconds for Lava, 372 ±126 seconds for iTero, and 357 ±55 seconds for Cerec. The total working time for the conventional impression was significantly lower than that for Lava and Cerec. With regard to the working time without powdering, the differences between the methods were not statistically significant. The patient rating (very uncomfortable=0; comfortable=100) measured 61 ±34 for conventional impression, 71 ±18 for Lava, 66 ±20 for iTero, and 48 ±18 for Cerec. The differences were not statistically significant. The clinician rating (simple=0; very difficult=100) was 13 ±13 for the conventional impression, 54 ±27 for Lava, 22 ±11 for iTero, and 36 ±23 for Cerec. The differences between the conventional impression and Lava and between iTero and Lava were statistically significant. The conventional impression was more time-effective than the digital impressions. In terms of

Current status of disinfection of dental impressions in Indian dental colleges: a cause of concern.

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Marya, Charu Mohan; Shukla, Prasoon; Dahiya, Vandana; Jnaneswar, Avinash

2011-11-15

Dentistry is predominantly a field of surgery, involving exposure to blood and other potentially infectious materials and therefore requires a high standard of infection control and safety practice in controlling cross-contamination and occupational exposures to blood- and saliva-borne diseases. A questionnaire survey was conducted in 60 dental colleges throughout India to establish routine methods of treating impressions of the oral cavity for disinfection. An email describing the purpose of the study along with a short questionnaire was sent to one of the teaching faculty of concerned departments of the colleges. Questions were asked regarding availability of materials required to disinfect the impressions, the preferred method to treat the impression, and whether postgraduate courses were offered by the department. The routine method of treating the impression reported by 75.9% of the respondents was washing under running water, while 24.1% of the respondents reported that impressions were treated by chemical disinfectants. Strict infection control measures are necessary to ensure the health and safety of dental workers and patients. The present study showed that there is a lack of commitment to high standards of infection control practices in dental colleges in India.

A review on common chemical hemostatic agents in restorative dentistry

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Pardis Tarighi

2014-01-01

Full Text Available Control of hemorrhage is one of the challenging situations dentists confront during deep cavity preparation and before impressions or cementation of restorations. For the best bond and least contamination it is necessary to be familiar with the hemostatic agents available on the market and to be able to choose the appropriate one for specific situations. This review tries to introduce the commercially available hemostatic agents, discusses their components and their specific features. The most common chemical agents that are widely used in restorative and prosthodontic dentistry according to their components and mechanism of action as well as their special uses are introduced. PubMed and Google Scholar were searched for studies involving gingival retraction and hemostatic agents from 1970 to 2013. Key search words including: "gingival retraction techniques, impression technique, hemostasis and astringent" were searched. Based on the information available in the literature, in order to achieve better results with impression taking and using resin bonding techniques, common hemostatic agents might be recommended before or during acid etching; they should be rinsed off properly and it is recommended that they be used with etch-and-rinse adhesive systems.

Accuracy of complete-arch dental impressions: a new method of measuring trueness and precision.

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Ender, Andreas; Mehl, Albert

2013-02-01

A new approach to both 3-dimensional (3D) trueness and precision is necessary to assess the accuracy of intraoral digital impressions and compare them to conventionally acquired impressions. The purpose of this in vitro study was to evaluate whether a new reference scanner is capable of measuring conventional and digital intraoral complete-arch impressions for 3D accuracy. A steel reference dentate model was fabricated and measured with a reference scanner (digital reference model). Conventional impressions were made from the reference model, poured with Type IV dental stone, scanned with the reference scanner, and exported as digital models. Additionally, digital impressions of the reference model were made and the digital models were exported. Precision was measured by superimposing the digital models within each group. Superimposing the digital models on the digital reference model assessed the trueness of each impression method. Statistical significance was assessed with an independent sample t test (α=.05). The reference scanner delivered high accuracy over the entire dental arch with a precision of 1.6 ±0.6 µm and a trueness of 5.3 ±1.1 µm. Conventional impressions showed significantly higher precision (12.5 ±2.5 µm) and trueness values (20.4 ±2.2 µm) with small deviations in the second molar region (PDigital impressions were significantly less accurate with a precision of 32.4 ±9.6 µm and a trueness of 58.6 ±15.8µm (Pdigital models were visible across the entire dental arch. The new reference scanner is capable of measuring the precision and trueness of both digital and conventional complete-arch impressions. The digital impression is less accurate and shows a different pattern of deviation than the conventional impression. Copyright © 2013 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

Contact angle of unset elastomeric impression materials.

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Menees, Timothy S; Radhakrishnan, Rashmi; Ramp, Lance C; Burgess, John O; Lawson, Nathaniel C

2015-10-01

Some elastomeric impression materials are hydrophobic, and it is often necessary to take definitive impressions of teeth coated with some saliva. New hydrophilic materials have been developed. The purpose of this in vitro study was to compare contact angles of water and saliva on 7 unset elastomeric impression materials at 5 time points from the start of mixing. Two traditional polyvinyl siloxane (PVS) (Aquasil, Take 1), 2 modified PVS (Imprint 4, Panasil), a polyether (Impregum), and 2 hybrid (Identium, EXA'lence) materials were compared. Each material was flattened to 2 mm and a 5 μL drop of distilled water or saliva was dropped on the surface at 25 seconds (t0) after the start of mix. Contact angle measurements were made with a digital microscope at initial contact (t0), t1=2 seconds, t2=5 seconds, t3=50% working time, and t4=95% working time. Data were analyzed with a generalized linear mixed model analysis, and individual 1-way ANOVA and Tukey HSD post hoc tests (α=.05). For water, materials grouped into 3 categories at all time-points: the modified PVS and one hybrid material (Identium) produced the lowest contact angles, the polyether material was intermediate, and the traditional PVS materials and the other hybrid (EXA'lence) produced the highest contact angles. For saliva, Identium, Impregum, and Imprint 4 were in the group with the lowest contact angle at most time points. Modified PVS materials and one of the hybrid materials are more hydrophilic than traditional PVS materials when measured with water. Saliva behaves differently than water in contact angle measurement on unset impression material and produces a lower contact angle on polyether based materials. Copyright © 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Mutually exclusive STAT1 modifications identified by Ubc9/substrate dimerization-dependent SUMOylation.

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Zimnik, Susan; Gaestel, Matthias; Niedenthal, Rainer

2009-03-01

Post-translational modifications control the physiological activity of the signal transducer and activator of transcription STAT1. While phosphorylation at tyrosine Y701 is a prerequisite for STAT1 dimerization, its SUMOylation represses the transcriptional activity. Recently, we have demonstrated that SUMOylation at lysine K703 inhibits the phosphorylation of nearby localized Y701 of STAT1. Here, we analysed the influence of phosphorylation of Y701 on SUMOylation of K703 in vivo. For that reason, an Ubc9/substrate dimerization-dependent SUMOylation (USDDS) system was developed, which consists of fusions of the SUMOylation substrate and of the SUMO-conjugating enzyme Ubc9 to the chemically activatable heterodimerization domains FKBP and FRB, respectively. When FKBP fusion proteins of STAT1, p53, CRSP9, FOS, CSNK2B, HES1, TCF21 and MYF6 are coexpressed with Ubc9-FRB, treatment of HEK293 cells with the rapamycin-related dimerizer compound AP21967 induces SUMOylation of these proteins in vivo. For STAT1-FKBP and p53-FKBP we show that this SUMOylation takes place at their specific SUMOylation sites in vivo. Using USDDS, we then demonstrate that STAT1 phosphorylation at Y701 induced by interferon-beta treatment inhibits SUMOylation of K703 in vivo. Thus, pY701 and SUMO-K703 of STAT1 represent mutually exclusive modifications, which prevent signal integration at this molecule and probably ensure the existence of differentially modified subpopulations of STAT1 necessary for its regulated nuclear cytoplasmic activation/inactivation cycle.

From alginate impressions to digital virtual models: accuracy and reproducibility.

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Dalstra, Michel; Melsen, Birte

2009-03-01

To compare the accuracy and reproducibility of measurements performed on digital virtual models with those taken on plaster casts from models poured immediately after the impression was taken, the 'gold standard', and from plaster models poured following a 3-5 day shipping procedure of the alginate impression. Direct comparison of two measuring techniques. The study was conducted at the Department of Orthodontics, School of Dentistry, University of Aarhus, Denmark in 2006/2007. Twelve randomly selected orthodontic graduate students with informed consent. Three sets of alginate impressions were taken from the participants within 1 hour. Plaster models were poured immediately from two of the sets, while the third set was kept in transit in the mail for 3-5 days. Upon return a plaster model was poured as well. Finally digital models were made from the plaster models. A number of measurements were performed on the plaster casts with a digital calliper and on the corresponding digital models using the virtual measuring tool of the accompanying software. Afterwards these measurements were compared statistically. No statistical differences were found between the three sets of plaster models. The intra- and inter-observer variability are smaller for the measurements performed on the digital models. Sending alginate impressions by mail does not affect the quality and accuracy of plaster casts poured from them afterwards. Virtual measurements performed on digital models display less variability than the corresponding measurements performed with a calliper on the actual models.

Accuracy evaluation of intraoral optical impressions: A clinical study using a reference appliance.

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Atieh, Mohammad A; Ritter, André V; Ko, Ching-Chang; Duqum, Ibrahim

2017-09-01

�6.6 μm and mean precision of 16.9 ±5.8 μm than optical impressions with a mean trueness of 46.2 ±11.4 μm and mean precision of 61.1 ±4.9 μm. Complete arch (first molar-to-first molar) optical impressions were less accurate than conventional impressions but may be adequate for quadrant impressions. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Evaluating the marginal fit of zirconia copings with digital impressions with an intraoral digital scanner.

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An, Shinyoung; Kim, Sungtae; Choi, Hyunmin; Lee, Jae-Hoon; Moon, Hong-Seok

2014-11-01

Digital impression systems have been developed to overcome the disadvantages associated with conventional impression methods. The purpose of this study was to compare the marginal fit of zirconia copings designed with the use of an iTero digital scanner with those designed by the conventional impression technique. Thirty identical cast, base-metal dies from 1 maxillary central incisor prepared for a ceramic crown restoration were fabricated. For the conventional impression group (CI), base metal dies (n=10) were replicated as stone dies by means of a conventional impression technique with polyvinyl siloxane material. For the iTero with polyurethane group (iP), base metal dies (n=10) were replicated as polyurethane dies with the iTero digital impression system. For the iTero with no dies group (iNo), base metal dies (n=10) were scanned with the iTero digital impression system, but no dies were fabricated. For each group, 10 zirconia copings were fabricated based on the stone dies (CI group), polyurethane dies (iP group), or stereolithography files (iNo group). The marginal gap of each specimen was measured with a light microscope at ×50 magnification. One-way analysis of variance and the Tukey honestly significant difference test were used for statistical analysis (α=.05). Statistically significant differences were found between the CI group and iP group (Pdigital impression method than in the group that used the conventional impression method. However, the marginal discrepancies of all of the groups were clinically acceptable. Copyright © 2014 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Study motives, career choices and interest in paediatric dentistry among final year dental students in Nigeria

Science.gov (United States)

2014-01-01

Background Students’ motives for studying Dentistry have been a subject of interest for years because of the potential for understanding the psychological makeup and subsequent job satisfaction for the dentist. It is also useful in identifying expectations of the profession. This study therefore tried to identify study motives and career preferences of dental students especially with respect to the practice of paediatric dentistry. Methods This was a cross-sectional study using a self-administered questionnaire. The final year students in six dental schools in Nigeria were required to fill the questionnaire. Students were asked to rank their motives and career preferences on a Likert like scale with points ranging from 0–5 where 0 represented a factor that had no influence on their decision and 5 represented a very influential factor. The underlying dimensions for study motives, career preference, impression about and motive for interest in the practice of paediatric dentistry were identified using factor analysis. Results One hundred and seventy nine of 223 students (80.3%) participated in this study. Motives for the practice of dentistry included characteristics of the profession, altruism and intellectual challenges, existence of artistic theme in dentistry and parent’s recommendation. Overall, 67.1% of respondents indicated interest in postgraduate studies and 50.8% were interested in paediatric dentistry practice. The main motives for showing interest in the practice of paediatric dentistry were ‘personal interest, professional interest and interest of significant others in children’, and ‘family influence’. Significantly more males than females were interested in the practice of paediatric dentistry though the motives for interest in the practice of paediatric dentistry did not differ significantly by sex or age. Conclusion The non-significant sex difference in the motives for interest in the practice of paediatric dentistry is a possible

The fission yeast ubiquitin-conjugating enzymes UbcP3, Ubc15, and Rhp6 affect transcriptional silencing of the mating-type region

DEFF Research Database (Denmark)

Nielsen, Inga Sig; Nielsen, Olaf; Murray, Johanne M

2002-01-01

Genes transcribed by RNA polymerase II are silenced when introduced near the mat2 or mat3 mating-type loci of the fission yeast Schizosaccharomyces pombe. Silencing is mediated by a number of gene products and cis-acting elements. We report here the finding of novel trans-acting factors identified...... was not suppressed by a mutation in the 26S proteasome, suggesting that loss of silencing is not due to an increased degradation of silencing factors but rather to the posttranslational modification of proteins by ubiquitination. We discuss the implications of these results for the possible modes of action of UbcP3...

Green dentistry: The future

Directory of Open Access Journals (Sweden)

Mensudar Rathakrishnan

2017-01-01

Full Text Available Dentistry is a profession dedicated to promote health and wellness of the people. Green dentistry is a relatively new emerging concept in dentistry. Most dental offices are privately-owned small businesses and have no financial advantage to invest in many environmental-friendly practices. For this reason, more research is needed to find cost-effective environmental alternatives in dentistry. The aim of this article is to expand awareness and practice of eco-friendly dentistry.

Effect of digital impressions and production protocols on the adaptation of zirconia copings.

Science.gov (United States)

Kocaağaoğlu, Hasan; Kılınç, Halil Ibrahim; Albayrak, Haydar

2017-01-01

Proper marginal, axial, and occlusal adaptation of dental restorations is essential for their long-term success. Production protocols including digital impression systems have been developed, but little information is available on the adaptation of zirconia restorations produced via them. The purpose of this in vitro study was to compare the effects of digital impression protocols on the marginal, axial, and occlusal adaptation of zirconia copings. Thirty extracted human maxillary premolar teeth without caries or defects were used. The teeth were prepared for zirconia crowns and randomly divided into 3 groups. Zirconia copings were designed at a thickness of 0.5 mm with 30 μm of simulated die spacer starting 1 mm from the margin of preparations. They were produced using computer-aided design-computer-aided manufacture (CAD-CAM) protocol with a conventional impression (group Cn) and 2 different production protocols with digital impressions (group C) and group Tr. The marginal, axial, and occlusal discrepancies of these copings were measured using the silicone replica technique with stereomicroscopy at ×50 magnification, and the data were analyzed with 1-way ANOVAs (α=.05). The mean marginal discrepancy values were 85.6 μm for group Cn, 58.7 μm for group C, and 47.7 μm for the Tr group. Significant differences were found among the production protocols in marginal, axial, and occlusal discrepancies (Pdigital impressions had significantly fewer marginal discrepancies than those of group Cn (P.05), and group Tr revealed the lowest axial discrepancy (P.05). The copings produced with the aid of digital impression systems exhibited better marginal and occlusal adaptation than those of the copings produced with the aid of conventional impression. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Cosmetic Dentistry

Science.gov (United States)

If you have stained, broken or uneven teeth, cosmetic dentistry can help. Cosmetic dentistry is different from orthodontic treatment, which can straighten your teeth with braces or other devices. Cosmetic dental procedures include Bleaching to make teeth whiter ...

Clinical marginal fit of zirconia crowns and patients' preferences for impression techniques using intraoral digital scanner versus polyvinyl siloxane material.

Science.gov (United States)

Sakornwimon, Nawapat; Leevailoj, Chalermpol

2017-09-01

The use of digital intraoral scanners is increasing; however, evidence of its precision in making crown impressions clinically remains scarce. Patients should also feel more comfortable with digital impressions, but only a few studies evaluating this subject have been performed. The purpose of this clinical study was to evaluate the marginal fit of monolithic zirconia crowns and patients' preferences for digital impressions versus polyvinyl siloxane (PVS) impressions. Sixteen participants with indications for single molar crowns were included. After crown preparation, digital impressions by intraoral scanner and PVS impressions were made. The participants were asked to complete a 6-item questionnaire with a visual analog scale related to perceptions of each of the following topics: time involved, taste/smell, occlusal registration, size of impression tray/scanner, gag reflex, and overall preference. Computer-aided design and computer-aided manufacturing monolithic zirconia crowns were fabricated from both impressions. The crowns were evaluated intraorally, and a blinded examiner measured the marginal discrepancy of silicone replicas under a stereomicroscope. Intraexaminer reliability was evaluated by calculating the intraclass correlation coefficient. Data for patients' preferences and marginal discrepancies were analyzed using the paired t test (α=.05). Visual analog scale scores for digital impressions were statistically significantly higher than those for PVS impressions in every topic (Pdigital group on all sides (P>.05). No differences were found in the clinical marginal fit of zirconia crowns fabricated from either digital impressions compared with PVS impressions. Furthermore, patients' satisfaction with digital impressions was significantly higher than with conventional impressions. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Nano dentistry

International Nuclear Information System (INIS)

Oh, S.; Park, Y.B.; Kim, S.; Jin, S.

2014-01-01

Nano technology in dentistry has drawn many scientists’ and clinicians’ attention to significant advances in the diagnosis, treatment, and prevention of oral disease. Also, nano materials in dentistry have been studied to overcome the physical and chemical characteristics of conventional dental materials. These interesting facts are the motivation of this special issue. The presented issue provides a variety of topics in the field of dentistry such as novel nano filled composite resin, the cytotoxicity of nanoparticles deposited on orthodontic bands, the osseointegration of 3D nano scaffold, and nano surface treated implant.

Awareness, knowledge, and attitude of dentistry students in Kerman towards evidence-based dentistry

Science.gov (United States)

Sarani, Arezoo; Sarani, Melika; Abdar, Mohammad Esmaeli; Abdar, Zahra Esmaeili

2016-01-01

Introduction Evidence-based care helps dentists provide quality dental services to patients, and such care is based on the use of reliable information about treatment and patient care from a large number of papers, books, and published textbooks. This study aimed to determine the knowledge, awareness, and attitude of dentistry students towards evidence-based dentistry. Methods In this cross-sectional study, all dentistry students who were studying in their sixth semester and higher in the Kerman School of Dentistry (n = 73) were studied. The data were analyzed using SPSS version 17 and the independent-samples t-tests and the ANOVA test. Results The means of the students’ knowledge, awareness, and attitude scores were 29.2 ± 10.8, 29.9 ± 8.12 and 44.5 ± 5.3, respectively. Among demographic variables, only the number of semesters showed a significant difference with knowledge, awareness, and attitude of dentistry students toward evidence-based dentistry (p = 0.001). Conclusion According to the results of this study, knowledge and awareness of dentistry students at Kerman University of Medical Sciences towards evidence-based dentistry were average and have a neutral attitude. Thus, providing necessary training in this regard will cause promoting the knowledge, awareness, and improved attitudes of dentistry students. PMID:27382446

Human Ubc9 is involved in intracellular HIV-1 Env stability after trafficking out of the trans-Golgi network in a Gag dependent manner.

Directory of Open Access Journals (Sweden)

Christopher R Bohl

Full Text Available The cellular E2 Sumo conjugase, Ubc9 interacts with HIV-1 Gag, and is important for the assembly of infectious HIV-1 virions. In the previous study we demonstrated that in the absence of Ubc9, a defect in virion assembly was associated with decreased levels of mature intracellular Envelope (Env that affected Env incorporation into virions and virion infectivity. We have further characterized the effect of Ubc9 knockdown on HIV Env processing and assembly. We found that gp160 stability in the endoplasmic reticulum (ER and its trafficking to the trans-Golgi network (TGN were unaffected, indicating that the decreased intracellular mature Env levels in Ubc9-depleted cells were due to a selective degradation of mature Env gp120 after cleavage from gp160 and trafficked out of the TGN. Decreased levels of Gag and mature Env were found to be associated with the plasma membrane and lipid rafts, which suggest that these viral proteins were not trafficked correctly to the assembly site. Intracellular gp120 were partially rescued when treated with a combination of lysosome inhibitors. Taken together our results suggest that in the absence of Ubc9, gp120 is preferentially degraded in the lysosomes likely before trafficking to assembly sites leading to the production of defective virions. This study provides further insight in the processing and packaging of the HIV-1 gp120 into mature HIV-1 virions.

Are We Doing Any Good? A Value-Added Analysis of UBC's Science One Program

Directory of Open Access Journals (Sweden)

Chris Waltham

2012-12-01

Full Text Available Science One is a full academic year interdisciplinary alternative to the traditional first-year experience in the Faculty of Science at the University of British Columbia (UBC. Anecdotal reports suggest that alumni/ae of the program do very well in upper-level classes and many become successful graduate and medical students. The high faculty/student ratio makes the program an expensive one, however, and thus we have sought rigorous evidence of the benefits to our students. Our approach has been a value-added one; we have compared high-school and upper-level undergraduate grades for students in all UBC's first-year science programs. We have found a clear signal that there is a large benefit to participating in Science One, and conclude that this arises from a combination of the recruitment of enthusiastic students who are up for a challenge, the Science One admissions process, and taking the program itself.Science One consiste en une année scolaire interdisciplinaire complète qui représente une variante de l’expérience traditionnelle vécue en première année à la Faculté des sciences de l’Université de la Colombie-Britannique (UBC. Des rapports isolés suggèrent que les anciens étudiants du programme obtiennent de très bons résultats dans les cours de niveau supérieur et plusieurs obtiennent leur diplôme avec succès et étudient en médecine. Cependant, le ratio élevé enseignant/étudiant fait en sorte que le programme coûte cher, c’est pourquoi les auteurs ont cherché à obtenir des données probantes sur les avantages qu’il présente pour leurs étudiants. Ils ont employé la méthode de la valeur ajoutée; ont comparé les notes obtenues au secondaire et celles des étudiants de premier cycle inscrits à des cours de niveau supérieur dans tous les programmes scientifiques offerts à l’UBC. Ils ont découvert que la participation à Science One est très bénéfique et ont conclu que cela résulte d�

Marginal adaptation of CAD-CAM onlays: Influence of preparation design and impression technique.

Science.gov (United States)

Lima, Fernanda Ferruzzi; Neto, Constantino Fernandes; Rubo, José H; Santos, Gildo Coelho; Moraes Coelho Santos, Maria Jacinta

2018-03-15

restorations within a clinically acceptable range; however, the indirect impression technique resulted in the fabrication of restorations with superior marginal adaptation on the buccal location. Copyright © 2017 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Examination of the Position Accuracy of Implant Abutments Reproduced by Intra-Oral Optical Impression

Science.gov (United States)

Odaira, Chikayuki; Kobayashi, Takuya; Kondo, Hisatomo

2016-01-01

An impression technique called optical impression using intraoral scanner has attracted attention in digital dentistry. This study aimed to evaluate the accuracy of the optical impression, comparing a virtual model reproduced by an intraoral scanner to a working cast made by conventional silicone impression technique. Two implants were placed on a master model. Working casts made of plaster were fabricated from the master model by silicone impression. The distance between the ball abutments and the angulation between the healing abutments of 5 mm and 7 mm height at master model were measured using Computer Numerical Control Coordinate Measuring Machine (CNCCMM) as control. Working casts were then measured using CNCCMM, and virtual models via stereo lithography data of master model were measured by a three-dimensional analyzing software. The distance between ball abutments of the master model was 9634.9 ± 1.2 μm. The mean values of trueness of the Lava COS and working casts were 64.5 μm and 22.5 μm, respectively, greater than that of control. The mean of precision values of the Lava COS and working casts were 15.6 μm and 13.5 μm, respectively. In the case of a 5-mm-height healing abutment, mean angulation error of the Lava COS was greater than that of the working cast, resulting in significant differences in trueness and precision. However, in the case of a 7-mm-height abutment, mean angulation errors of the Lava COS and the working cast were not significantly different in trueness and precision. Therefore, distance errors of the optical impression were slightly greater than those of conventional impression. Moreover, the trueness and precision of angulation error could be improved in the optical impression using longer healing abutments. In the near future, the development of information technology could enable improvement in the accuracy of the optical impression with intraoral scanners. PMID:27706225

Digital versus analog complete-arch impressions for single-unit premolar implant crowns: Operating time and patient preference.

Science.gov (United States)

Schepke, Ulf; Meijer, Henny J A; Kerdijk, Wouter; Cune, Marco S

2015-09-01

Digital impression-making techniques are supposedly more patient friendly and less time-consuming than analog techniques, but evidence is lacking to substantiate this assumption. The purpose of this in vivo within-subject comparison study was to examine patient perception and time consumption for 2 complete-arch impression-making methods: a digital and an analog technique. Fifty participants with a single missing premolar were included. Treatment consisted of implant therapy. Three months after implant placement, complete-arch digital (Cerec Omnicam; Sirona) and analog impressions (semi-individual tray, Impregum; 3M ESPE) were made, and the participant's opinion was evaluated with a standard questionnaire addressing several domains (inconvenience, shortness of breath, fear of repeating the impression, and feelings of helplessness during the procedure) with the visual analog scale. All participants were asked which procedure they preferred. Operating time was measured with a stopwatch. The differences between impressions made for maxillary and mandibular implants were also compared. The data were analyzed with paired and independent sample t tests, and effect sizes were calculated. Statistically significant differences were found in favor of the digital procedure regarding all subjective domains (P<.001), with medium to large effect sizes. Of all the participants, over 80% preferred the digital procedure to the analog procedure. The mean duration of digital impression making was 6 minutes and 39 seconds (SD=1:51) versus 12 minutes and 13 seconds (SD=1:24) for the analog impression (P<.001, effect size=2.7). Digital impression making for the restoration of a single implant crown takes less time than analog impression making. Furthermore, participants preferred the digital scan and reported less inconvenience, less shortness of breath, less fear of repeating the impression, and fewer feelings of helplessness during the procedure. Copyright © 2015 Editorial Council

How the adoption of impression management goals alters impression formation.

Science.gov (United States)

Gibson, Bryan; Poposki, Elizabeth M

2010-11-01

Five experiments (N = 390) tested the hypothesis that adopting an impression management goal leads the impression manager to view an interaction partner as having less of the trait he or she is attempting to express. This hypothesis was confirmed for the impression management goals of appearing introverted, extraverted, smart, confident, and happy. Experiment 2 shows that adoption of the impression goal could alter judgments even when participants could not act on the goal. Experiment 3 provides evidence that adopting an impression management goal prompted a comparison mind-set and that this comparison mind-set activation mediated target judgments. Experiment 4 rules out a potential alternative explanation and provides more direct evidence that comparison of the impression manager's self-concept mediates the impression of the target. Experiment 5 eliminates a potential confound and extends the effect to another impression goal. These experiments highlight the dynamic interplay between impression management and impression formation.

Effect of disinfection on irreversible hydrocolloid and alternative impression materials and the resultant gypsum casts.

Science.gov (United States)

Suprono, Montry S; Kattadiyil, Mathew T; Goodacre, Charles J; Winer, Myron S

2012-10-01

impression material. The alternative impression materials performed best for the parameters tested. Spray disinfection had no effect on the alternative impression materials. Copyright © 2012 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

Mining processes in dentistry

NARCIS (Netherlands)

Mans, R.S.; Reijers, H.A.; van Genuchten, M.; Wismeijer, D.

2012-01-01

Business processes in dentistry are quickly evolving towards "digital dentistry". This means that many steps in the dental process will increasingly deal with computerized information or computerized half products. A complicating factor in the improvement of process performance in dentistry,

[Dentistry students' reasons for choosing dentistry as a career in Damascus University].

Science.gov (United States)

Mashlah, A M

2012-05-01

This cross-sectional questionnaire survey assessed the motives for choosing dentist as a profession among dentistry students at Damascus University, Syrian Arab Republic. A total of 408 undergraduate students (233 males and 175 females) aged 18-23 years were selected randomly from students in the second, third and fourth years of dentistry study. They completed a questionnaire that enquired about their reasons for studying dentistry as well as their sociodemographic characteristics. The number of admissions in females had increased over the 3 years. Most parents of the students were university-educated. The main motivation for choosing dentistry was as a means to achieve personal goals, including getting a good job abroad, having financial independence, and attaining a good reputation. There were significant differences between the sexes with regard to the reasons for choosing dentistry.

Laser in operative dentistry

OpenAIRE

E. Yasini; Gh. Rahbari; A. Matorian

1994-01-01

Today laser has a lot of usage in medicine and dentistry. In the field of dentistry, laser is used in soft tissue surgery, sterilization of canals (in root canal therapy) and in restorative dentistry laser is used for cavity preparation, caries removal, sealing the grooves (in preventive dentistry), etching enamel and dentin, composite polymerization and removal of tooth sensitivity. The use of Co2 lasers and Nd: YAG for cavity preparation, due to creating high heat causes darkness and cracks...

Digital versus conventional implant impressions for partially edentulous arches: An evaluation of accuracy.

Science.gov (United States)

Marghalani, Amin; Weber, Hans-Peter; Finkelman, Matthew; Kudara, Yukio; El Rafie, Khaled; Papaspyridakos, Panos

2018-04-01

Definition technique had the fewest 3D deviations compared with the other 2 techniques; however, the accuracy of all impression techniques was within clinically acceptable levels, and not all differences were statistically significant. Copyright © 2017 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Antimicrobial activity and properties of irreversible hydrocolloid impression materials incorporated with silver nanoparticles.

Science.gov (United States)

Ginjupalli, Kishore; Alla, Rama Krishna; Tellapragada, Chaitanya; Gupta, Lokendra; Upadhya Perampalli, Nagaraja

2016-06-01

Conventional spray and the immersion disinfection of irreversible hydrocolloid impression materials may lead to dimensional changes. The purpose of this in vitro study was to investigate the antimicrobial activity and properties of irreversible hydrocolloid impression materials incorporated with silver nanoparticles. The antimicrobial activity and properties of 2 commercially available irreversible hydrocolloid impression materials were evaluated after incorporating varying concentrations of silver nanoparticles. Antimicrobial activity was determined using the disk diffusion method. The gel strength, permanent deformation, flow, and gelation time were measured according to American Dental Association specification #18. Analysis of variance was used to identify the significant differences within and across the groups (α=.05). Adding silver nanoparticles to irreversible hydrocolloid impression materials resulted in superior antimicrobial activity without adversely affecting their properties. Adding silver nanoparticles to Zelgan significantly increased the gel strength compared with the control group, except at 5 wt%. However, the gel strength of Tropicalgin was unaffected except at 5 wt%. An increase in the permanent deformation was found with the incorporation of silver nanoparticles in both Zelgan and Tropicalgin. The flow of Zelgan increased with the incorporation of silver nanoparticles, whereas a decrease in the flow of Tropicalgin was observed at 1 wt% and 2 wt%. An increase in the gelation time of both Zelgan and Tropicalgin was observed with the incorporation of silver nanoparticles. Based on this in vitro study, silver nanoparticles can be incorporated into irreversible hydrocolloid impression materials as antimicrobial agents without adversely affecting their properties. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Structure of a SUMO-binding-motif mimic bound to Smt3p–Ubc9p: conservation of a noncovalent Ubiquitin-like protein–E2 complex as a platform for selective interactions within a SUMO pathway

Science.gov (United States)

Duda, David M.; van Waardenburg, Robert C. A. M.; Borg, Laura A.; McGarity, Sierra; Nourse, Amanda; Waddell, M. Brett; Bjornsti, Mary-Ann; Schulman, Brenda A.

2007-01-01

Summary The SUMO ubiquitin-like proteins play regulatory roles in cell division, transcription, DNA repair, and protein subcellular localization. Paralleling other ubiquitin-like proteins, SUMO proteins are proteolytically processed to maturity, conjugated to targets by E1-E2-E3 cascades, and subsequently recognized by specific downstream effectors containing a SUMO-binding motif (SBM). SUMO and its E2 from the budding yeast S. cerevisiae, Smt3p and Ubc9p, are encoded by essential genes. Here we describe the 1.9 Å resolution crystal structure of a noncovalent Smt3p–Ubc9p complex. Unexpectedly, a heterologous portion of the crystallized complex derived from the expression construct mimics an SBM, and binds Smt3p in a manner resembling SBM binding to human SUMO family members. In the complex, Smt3p binds a surface distal from Ubc9's catalytic cysteine. The structure implies that a single molecule of Smt3p cannot bind concurrently to both the noncovalent binding site and the catalytic cysteine of a single Ubc9p molecule. However, formation of higher-order complexes can occur, where a single Smt3p covalently linked to one Ubc9p's catalytic cysteine also binds noncovalently to another molecule of Ubc9p. Comparison with other structures from the SUMO pathway suggests that formation of the noncovalent Smt3p–Ubc9p complex occurs mutually exclusively with many other Smt3p and Ubc9p interactions in the conjugation cascade. By contrast, high-resolution insights into how Smt3p–Ubc9p can also interact with downstream recognition machineries come from contacts with the SBM mimic. Interestingly, the overall architecture of the Smt3p–Ubc9p complex is strikingly similar to recent structures from the ubiquitin pathway. The results imply that noncovalent ubiquitin-like protein–E2 complexes are conserved platforms, which function as parts of larger assemblies involved many protein post-translational regulatory pathways. PMID:17475278

Biomimetic dentistry

OpenAIRE

Suchetana Goswami

2018-01-01

“Biomimetics” is the field of science that uses the natural system of synthesizing materials through biomimicry. This method can be widely used in dentistry for regeneration of dental structures and replacement of lost dental tissues. This is a review paper that states its scope, history, different fields of biomimetic dentistry, and its future conditions in India.

[Specialties in dentistry. 4. Post-academic specialization in geriatric dentistry

NARCIS (Netherlands)

Schaub, R.M.; Baat, C. de

2006-01-01

In recent years, a specialization in geriatric dentistry has been established and along with it an educational programme. A specialist in geriatric dentistry is a dentist general practitioner with special knowledge and skills for delivering oral care to frail elderly people. The educational

Specialties in dentistry. 4. Post-academic specialization in geriatric dentistry

NARCIS (Netherlands)

Schaub, R.M.; de Baat, C.

2006-01-01

In recent years, a specialization in geriatric dentistry has been established and along with it an educational programme. A specialist in geriatric dentistry is a dentist general practitioner with special knowledge and skills for delivering oral care to frail elderly people. The educational

Accuracy of impressions with different impression materials in angulated implants.

Science.gov (United States)

Reddy, S; Prasad, K; Vakil, H; Jain, A; Chowdhary, R

2013-01-01

To evaluate the dimensional accuracy of the resultant (duplicative) casts made from two different impression materials (polyvinyl siloxane and polyether) in parallel and angulated implants. Three definitive master casts (control groups) were fabricated in dental stone with three implants, placed at equi-distance. In first group (control), all three implants were placed parallel to each other and perpendicular to the plane of the cast. In the second and third group (control), all three implants were placed at 10° and 15 o angulation respectively to the long axis of the cast, tilting towards the centre. Impressions were made with polyvinyl siloxane and polyether impression materials in a special tray, using a open tray impression technique from the master casts. These impressions were poured to obtain test casts. Three reference distances were evaluated on each test cast by using a profile projector and compared with control groups to determine the effect of combined interaction of implant angulation and impression materials on the accuracy of implant resultant cast. Statistical analysis revealed no significant difference in dimensional accuracy of the resultant casts made from two different impression materials (polyvinyl siloxane and polyether) by closed tray impression technique in parallel and angulated implants. On the basis of the results of this study, the use of both the impression materials i.e., polyether and polyvinyl siloxane impression is recommended for impression making in parallel as well as angulated implants.

Biomimetic dentistry

Directory of Open Access Journals (Sweden)

Suchetana Goswami

2018-01-01

Full Text Available “Biomimetics” is the field of science that uses the natural system of synthesizing materials through biomimicry. This method can be widely used in dentistry for regeneration of dental structures and replacement of lost dental tissues. This is a review paper that states its scope, history, different fields of biomimetic dentistry, and its future conditions in India.

Efficacy of DNA double-strand breaks repair in breast cancer is decreased in carriers of the variant allele of the UBC9 gene c.73G>A polymorphism

International Nuclear Information System (INIS)

Synowiec, Ewelina; Krupa, Renata; Morawiec, Zbigniew; Wasylecka, Maja; Dziki, Lukasz; Morawiec, Jan; Blasiak, Janusz; Wozniak, Katarzyna

2010-01-01

UBC9 (E2) SUMO conjugating enzyme plays an important role in the maintenance of genome stability and integrity. In the present work we examined the association between the c.73G>A (Val25Met) polymorphism of the UBC9 gene (rs11553473) and efficacy of DNA double-strand breaks (DSBs) repair (DRE) in breast cancer patients. We determined the level of endogenous (basal) and exogenous (induced by γ-irradiation) DSBs and efficacy of their repair in peripheral blood lymphocytes of 57 breast cancer patients and 70 healthy individuals. DNA damage and repair were studied by neutral comet assay. Genotypes were determined in DNA from peripheral blood lymphocytes by allele-specific PCR (ASO-PCR). We also correlated genotypes with the clinical characteristics of breast cancer patients. We observed a strong association between breast cancer occurrence and the variant allele carried genotypes in patients with elevated level of basal as well as induced DNA damage (OR 6.74, 95% CI 2.27-20.0 and OR 5.33, 95% CI 1.81-15.7, respectively). We also found statistically significant (p A polymorphism of the UBC9 gene in breast cancer patients. Carriers of variant allele have decreased DNA DRE as compared to wild type genotype carriers. We did not find any association with the UBC9 gene polymorphism and estrogen and progesterone receptor status. The variant allele of the UBC9 gene polymorphism was strongly inversely related to HER negative breast cancer patients (OR 0.03, 95% CI 0.00-0.23). Our results suggest that the c.73G>A polymorphism of the UBC9 gene may affect DNA DSBs repair efficacy in breast cancer patients.

Green dentistry, a metamorphosis towards an eco-friendly dentistry: a short communication.

Science.gov (United States)

Rastogi, Varun; Sharma, Rachna; Yadav, Lalita; Satpute, Pranali; Sharma, Vandana

2014-07-01

Dentistry is most importantly and foremost a healing profession. In today's world, it is very necessary to understand the importance of being eco-friendly in every facet of our lives, including dental practice which has a huge impact on the environment due to the large amount of metallic waste generated by various dental procedures along with excessive use of water and electricity, which specifically emphasis the thrust to move towards 'Green dentistry'. Green dentistry is an innovative way of dental practice which is environment friendly and at the same time conserves money and time by reducing waste, conserving energy and decreasing pollution with the use of latest techniques and procedures. Green dentistry therefore, protects the environment and mankind from the hazards of rapid urbanisation in developing countries. The authors wish to emphasize the practice of eco-friendly, green dentistry in a developing country like India which needs to conserve resources and curb environmental pollution.

Laser in operative dentistry

Directory of Open Access Journals (Sweden)

E. Yasini

1994-06-01

Full Text Available Today laser has a lot of usage in medicine and dentistry. In the field of dentistry, laser is used in soft tissue surgery, sterilization of canals (in root canal therapy and in restorative dentistry laser is used for cavity preparation, caries removal, sealing the grooves (in preventive dentistry, etching enamel and dentin, composite polymerization and removal of tooth sensitivity. The use of Co2 lasers and Nd: YAG for cavity preparation, due to creating high heat causes darkness and cracks around the region of laser radiation. Also due to high temperature of these lasers, pulp damage is inevitable. So today, by using the Excimer laser especially the argon floride type with a wavelength of 193 nm, the problem of heat stress have been solved, but the use of lasers in dentistry, especially for cavity preparation needs more researches and evaluations.

Influence of disinfection with peracetic acid and hypochlorite in dimensional alterations of casts obtained from addition silicone and polyether impressions.

Science.gov (United States)

Queiroz, Daher Antonio; Peçanha, Marcelo Massaroni; Neves, Ana Christina Claro; Frizzera, Fausto; Tonetto, Mateus Rodrigues; Silva-Concílio, Laís Regiane

2013-11-01

Dental impressions disinfection is important to reduce the risk of cross contamination but this process may produce dimensional distortions. Peracetic acid is a disinfectant agent with several favorable characteristics yet underutilized in Dentistry. The aim of this paper is to compare the dimensional stability of casts obtained from addition silicone and polyether impressions that were immersed for 10 minutes in a solution of 0.2% peracetic acid or 1% sodium hypochlorite. Sixty samples in type IV gypsum were produced after a master cast that simulated a full crown preparation of a maxillary premolar. Samples were divided in 6 groups (n = 10) according to the impression material and disinfection agent: Group AC--addition silicone control (without disinfectant); Group APA--addition silicone + 0.2% peracetic acid; Group AH--addition silicone + 1% sodium hypochlorite; Group PC--polyether control (without disinfectant); Group PPA--polyether + 0.2% peracetic acid; Group PH--polyether + 1% sodium hypochlorite. Cast height, base and top diameter were measured and a mean value was obtained for each sample and group all data was statistically analyzed (ANOVA, p polyether impressions regardless of the disinfectant materials. It can be concluded that disinfection with the proposed agents did not produce significant alterations of the impressions and the peracetic acid could be considered a reliable material to disinfect dental molds.

Intraoral scan bodies in implant dentistry: A systematic review.

Science.gov (United States)

Mizumoto, Ryan M; Yilmaz, Burak

2018-04-05

Intraoral scan body (ISB) design is highly variable and its role in the digital workflow and accuracy of digital impressions is not well understood. The purpose of this systematic review was to determine the relevant reports pertaining to ISBs with regard to design and accuracy and to describe their evolution and role in the digital dentistry workflow. Special attention was placed on their key features in relation to intraoral scanning technology and the digitization process. A MEDLINE/PubMed search was performed to identify relevant reports pertaining to ISB usage in dentistry. This search included but was not limited to scan body features and design, scan body accuracy, and scan body techniques and the role of ISBs in computer-aided design and computer-aided manufacturing (CAD-CAM) processes. Commercially available scan bodies were examined, and a patient situation was shown highlighting the use of ISBs in the digital workflow. Deficiencies in the reports were found regarding various scan body topics, including ISB features/design, accuracy, and the role of ISBs in CAD-CAM processes. ISBs are complex implant-positioning-transfer devices that play an essential role in the digital workflow and fabrication of accurately fitting implant-supported restorations. With scanner technology rapidly evolving and becoming more widespread, future studies are needed and should be directed toward all parts of the digital workflow when using ISBs. By understanding the basic components of ISBs and how they relate to digital scanning and CAD-CAM technology, more emphasis may be placed on their importance and usage in the digital workflow to ensure accurate transfer of implant position to the virtual and analog definitive cast. Efforts should be made by clinicians to identify an optimal ISB design in relation to the specific intraoral scanning technology being used. Copyright © 2017 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights

Impression Cytology

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Sevda Söker

2007-01-01

Full Text Available Impression cytology is fast, easy to perform, economical and non-invasive technique for the diagnosis of conjunctival eye diseases. Conjunctival impression cytology using cellulose acetate filter paper of the ocular surface epithelium with no side effects or contraindication. In this article, technique of conjunctival impression cytology is reviewed.

American Academy of Cosmetic Dentistry

Science.gov (United States)

... AACD AACD 2018: A Masterpiece of Comprehensive Cosmetic Dentistry Education 34th Annual Scientific Session | April 18-21 ... 222.9540 Contact Us © 2017American Academy of Cosmetic Dentistry American Academy of Cosmetic Dentistry (AACD) © 2017American Academy ...

Caspase recruitment domain of procaspase-2 could be a target for SUMO-1 modification through Ubc9

International Nuclear Information System (INIS)

Shirakura, Hiromi; Hayashi, Naoko; Ogino, Shin-ichi; Tsuruma, Kazuhiro; Uehara, Takashi; Nomura, Yasuyuki

2005-01-01

To identify the binding proteins that regulate the function of procaspase-2, we screened for proteins using the yeast two-hybrid method and isolated human Ubc9 and SUMO-1 as the candidates. Ubc9 and SUMO-1 interacted with the caspase recruitment domain of procaspase-2 in its N-terminal. We elucidated the covalent modification of procaspase-2 by SUMO-1 in mammalian cells by immunoprecipitation followed by Western blot analysis. Procaspase-2 and SUMO-1 were co-localized by dot-like structures in the nucleus that are related to promyelocytic leukemia bodies. Interestingly, a conjugation-deficient mutant (K60R) procaspase-2 resulted in a delay of its enzyme maturation (appearance of p12 subunit) compared to that of wild-type. Thus, the modification with SUMO-1 may play a critical role in the nuclear localization and the activation (maturation) of procaspase-2

Efficacy of DNA double-strand breaks repair in breast cancer is decreased in carriers of the variant allele of the UBC9 gene c.73G>A polymorphism

Energy Technology Data Exchange (ETDEWEB)

Synowiec, Ewelina [Department of Molecular Genetics, University of Lodz, Lodz (Poland); Krupa, Renata [Laboratory of DNA Repair, Department of Molecular Genetics, University of Lodz, Banacha 12/16, Lodz (Poland); Morawiec, Zbigniew; Wasylecka, Maja [Department of Surgical Oncology, N. Copernicus Hospital, Lodz (Poland); Dziki, Lukasz; Morawiec, Jan [Department of General and Colorectal Surgery, Medical University of Lodz, Lodz (Poland); Blasiak, Janusz [Department of Molecular Genetics, University of Lodz, Lodz (Poland); Wozniak, Katarzyna, E-mail: wozniak@biol.uni.lodz.pl [Laboratory of DNA Repair, Department of Molecular Genetics, University of Lodz, Banacha 12/16, Lodz (Poland)

2010-12-10

UBC9 (E2) SUMO conjugating enzyme plays an important role in the maintenance of genome stability and integrity. In the present work we examined the association between the c.73G>A (Val25Met) polymorphism of the UBC9 gene (rs11553473) and efficacy of DNA double-strand breaks (DSBs) repair (DRE) in breast cancer patients. We determined the level of endogenous (basal) and exogenous (induced by {gamma}-irradiation) DSBs and efficacy of their repair in peripheral blood lymphocytes of 57 breast cancer patients and 70 healthy individuals. DNA damage and repair were studied by neutral comet assay. Genotypes were determined in DNA from peripheral blood lymphocytes by allele-specific PCR (ASO-PCR). We also correlated genotypes with the clinical characteristics of breast cancer patients. We observed a strong association between breast cancer occurrence and the variant allele carried genotypes in patients with elevated level of basal as well as induced DNA damage (OR 6.74, 95% CI 2.27-20.0 and OR 5.33, 95% CI 1.81-15.7, respectively). We also found statistically significant (p < 0.05) difference in DRE related to the c.73G>A polymorphism of the UBC9 gene in breast cancer patients. Carriers of variant allele have decreased DNA DRE as compared to wild type genotype carriers. We did not find any association with the UBC9 gene polymorphism and estrogen and progesterone receptor status. The variant allele of the UBC9 gene polymorphism was strongly inversely related to HER negative breast cancer patients (OR 0.03, 95% CI 0.00-0.23). Our results suggest that the c.73G>A polymorphism of the UBC9 gene may affect DNA DSBs repair efficacy in breast cancer patients.

Structural model of the hUbA1-UbcH10 quaternary complex: in silico and experimental analysis of the protein-protein interactions between E1, E2 and ubiquitin.

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Stefania Correale

Full Text Available UbcH10 is a component of the Ubiquitin Conjugation Enzymes (Ubc; E2 involved in the ubiquitination cascade controlling the cell cycle progression, whereby ubiquitin, activated by E1, is transferred through E2 to the target protein with the involvement of E3 enzymes. In this work we propose the first three dimensional model of the tetrameric complex formed by the human UbA1 (E1, two ubiquitin molecules and UbcH10 (E2, leading to the transthiolation reaction. The 3D model was built up by using an experimentally guided incremental docking strategy that combined homology modeling, protein-protein docking and refinement by means of molecular dynamics simulations. The structural features of the in silico model allowed us to identify the regions that mediate the recognition between the interacting proteins, revealing the active role of the ubiquitin crosslinked to E1 in the complex formation. Finally, the role of these regions involved in the E1-E2 binding was validated by designing short peptides that specifically interfere with the binding of UbcH10, thus supporting the reliability of the proposed model and representing valuable scaffolds for the design of peptidomimetic compounds that can bind selectively to Ubcs and inhibit the ubiquitylation process in pathological disorders.

[Impressions techniques--Part 2].

Science.gov (United States)

Levartovsky, S; Masri, M; Alter, E; Pilo, R

2012-10-01

A dental impression is a positive replica of the teeth, the surrounding gingiva and the border between them; the purpose of which is to create an accurate master model. Two major techniques for impressions exist today: The conventional and the digital impressions. The current article describes both techniques. In the conventional impressions, it is important to choose a proper tray, stock or custom, and to mix the material properly. The commonly used impression techniques for making a conventional impression are described with a review on the effect of the technique on its accuracy. The effect of the wash bulk on the accuracy of the stone dies and/or the restoration is discussed, as well. The digital impressions with their advantages and disadvantages are described in comparison to the conventional impressions. Although, digital impressions eliminate some of the negative characteristics of conventional impressions, proper soft-tissue management and isolation of tooth preparation margins is still mandatory.

Academy of General Dentistry

Science.gov (United States)

... Examine Oral Systemic Health Nov 14, 2017 General Dentistry and American Family Physician Collaborate to Examine Oral ... Oral Health Oct 23, 2017 Academy of General Dentistry Foundation Celebrates 45 Years Raising Awareness for Oral ...

Accuracy of impressions with different impression materials in ...

African Journals Online (AJOL)

Purpose: To evaluate the dimensional accuracy of the resultant (duplicative) casts made from two ... materials in a special tray, using a open tray impression technique from the master casts. These impressions were poured to obtain test casts.

PERCEPTION OF ACADEMIC COURSE OF DENTISTRY ON THE USE OF PORTFOLIO AS A METHOD EVALUATIVE

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Jacques Antonio Cavalcante Maciel

2014-05-01

Full Text Available The portfolio is targeted as an innovative method of learning that allows you to record the reflections and impressions on the subject or course, promoting effective learning from experiences. This present study has aimed to describe the experience of the use of portfolios as a method of assessing learning in dental students and assess students' perceptions about the method. The research was quantitative, descriptive. The survey was conducted in dentistry course at Sobral UFC. We used a questionnaire containing ten questions to 23 students of the seventh semester of Dentistry, who attended Sobral UFC-modules of Community Health III between 2011.2 and had as one of evaluative methods to build the Portfolio. The portfolio was defined by students as a reflective report of the activities developed in theory and practice, and an evaluation method well accepted by academics. You can see that the evaluation method was efficient in its purpose, leading academics to develop a critical view on the theme developed in the classroom and that proved a facilitator in the process of teaching and learning for students.

Cosmetic Dentistry - Multiple Languages

Science.gov (United States)

... Here: Home → Multiple Languages → All Health Topics → Cosmetic Dentistry URL of this page: https://medlineplus.gov/languages/ ... W XYZ List of All Topics All Cosmetic Dentistry - Multiple Languages To use the sharing features on ...

Precision of fit between implant impression coping and implant replica pairs for three implant systems.

Science.gov (United States)

Nicoll, Roxanna J; Sun, Albert; Haney, Stephan; Turkyilmaz, Ilser

2013-01-01

The fabrication of an accurately fitting implant-supported fixed prosthesis requires multiple steps, the first of which is assembling the impression coping on the implant. An imprecise fit of the impression coping on the implant will cause errors that will be magnified in subsequent steps of prosthesis fabrication. The purpose of this study was to characterize the 3-dimensional (3D) precision of fit between impression coping and implant replica pairs for 3 implant systems. The selected implant systems represent the 3 main joint types used in implant dentistry: external hexagonal, internal trilobe, and internal conical. Ten impression copings and 10 implant replicas from each of the 3 systems, B (Brånemark System), R (NobelReplace Select), and A (NobelActive) were paired. A standardized aluminum test body was luted to each impression coping, and the corresponding implant replica was embedded in a stone base. A coordinate measuring machine was used to quantify the maximum range of displacement in a vertical direction as a function of the tightening force applied to the guide pin. Maximum angular displacement in a horizontal plane was measured as a function of manual clockwise or counterclockwise rotation. Vertical and rotational positioning was analyzed by using 1-way analysis of variance (ANOVA). The Fisher protected least significant difference (PLSD) multiple comparisons test of the means was applied when the F-test in the ANOVA was significant (α=.05). The mean and standard deviation for change in the vertical positioning of impression copings was 4.3 ±2.1 μm for implant system B, 2.8 ±4.2 μm for implant system R, and 20.6 ±8.8 μm for implant system A. The mean and standard deviation for rotational positioning was 3.21 ±0.98 degrees for system B, 2.58 ±1.03 degrees for system R, and 5.30 ±0.79 degrees for system A. The P-value for vertical positioning between groups A and B and between groups A and R was <.001. No significant differences were found for

SCIENTIFIC BASIS OF DENTISTRY

Directory of Open Access Journals (Sweden)

Yegane GÜVEN

2017-10-01

Full Text Available Technological and scientific innovations have increased exponentially over the past years in the dentistry profession. In this article, these developments are evaluated both in terms of clinical practice and their place in the educational program. The effect of the biologic and digital revolutions on dental education and daily clinical practice are also reviewed. Biomimetics, personalized dental medicine regenerative dentistry, nanotechnology, high-end simulations providing virtual reality, genomic information, and stem cell studies will gain more importance in the coming years, moving dentistry to a different dimension.

What about narrative dentistry?

Science.gov (United States)

Vergnes, Jean-Noel; Apelian, Nareg; Bedos, Christophe

2015-06-01

Narrative medicine strives toward a humanized form of medicine in which empathy and the ability to listen are developed with the same emphasis as scientific rigor. We hypothesize that the adoption of narrative medicine in dentistry would be an excellent method to cultivate the philosophy behind the emerging clinical concept of patient-centered dentistry. Reading literary works, reflective writing, and creative writing would sensitize practitioners to the daily lives of people, human uniqueness, and alterity. Narrative dentistry could lead to more empathic and self-aware practices, and improve dental professionals' observational abilities by making them more perceptive and more attentive to image, metaphor, and meaning. The introduction of narrative dentistry would enrich the clinical clerkship of dentists by bringing the often-missing humanities to the dental professional, academic, and scientific environment. Copyright © 2015 American Dental Association. Published by Elsevier Inc. All rights reserved.

Ergonomics in Dentistry

OpenAIRE

Dargahi H; Saraji J; Sadr J; Sadri G

2010-01-01

Background and Aims: There are several risk factors in dentistry professional environment. Carelessness about occupational health regulation endangers dentist's life. Erconomics in dentistry is a scientific approach which introduces the latest ergonomic principles in dental profession. It discusses about physical and mental stresses. Ergonomic programs eliminate dentist physical and mental challenges and provide practical solution to establish efficient and comforting environment. Materi...

Comparison of the marginal fit of lithium disilicate crowns fabricated with CAD/CAM technology by using conventional impressions and two intraoral digital scanners.

Science.gov (United States)

Abdel-Azim, Tamer; Rogers, Kelly; Elathamna, Eiad; Zandinejad, Amirali; Metz, Michael; Morton, Dean

2015-10-01

Conventional impression materials and techniques have been used successfully to fabricate fixed restorations. Recently, digital pathways have been developed, but insufficient data are available regarding their marginal accuracy. The purpose of this in vitro study was to compare the marginal gap discrepancy of lithium disilicate single crowns fabricated with computer-aided design and computer-aided manufacturing (CAD/CAM) technology by using both conventional and 2 digital impression techniques. One typodont maxillary right central incisor was prepared for a ceramic crown. Ten impressions were made by using each method: conventional with polyvinyl siloxane impression material, Lava COS (3M ESPE), and iTero (Cadent) intraoral scanning devices. Lithium disilicate (e.max CAD) crowns were fabricated with CAD/CAM technology, and the marginal gap was measured for each specimen at 4 points under magnification with a stereomicroscope. The mean measurement for each location and overall mean gap size by group were calculated. Statistically significant differences among the impression techniques were tested with F and t tests (α=.05). The average (±SD) gap for the conventional impression group was 112.3 (±35.3) μm. The digital impression groups had similar average gap sizes; the Lava group was 89.8 (±25.4) μm, and the iTero group was 89.6 (±30.1) μm. No statistically significant difference was found in the effects among impression techniques (P=.185) CONCLUSIONS: Within the limitations of this study, digital and conventional impressions were found to produce crowns with similar marginal accuracy. Copyright © 2015 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Development of radiobiological dentistry in Russia

International Nuclear Information System (INIS)

Lidenbraten, L.D.

1997-01-01

History of the radiological dentistry progress in Russia from the first report on the application of biomedical radiography techniques to dental practice in Russia in 1901 is briefly described. The first special X-ray room was open in 1921 in Petrograd. First scientific papers and guides on the radiological dentistry made their appearance. The second period in the development of Russian radiological dentistry was connected with the World War 2 and wounds of maxillo-facial wounds. Postwar time is characterized by application of the novel techniques, wide range of scientific researches in the radiological dentistry. The modern history of radiological dentistry began from 1983 due to computerized tomography used in case of malignant tumors of maxilla and nose cavity

Accuracy and reproducibility of virtual edentulous casts created by laboratory impression scan protocols.

Science.gov (United States)

Peng, Lingyan; Chen, Li; Harris, Bryan T; Bhandari, Bikash; Morton, Dean; Lin, Wei-Shao

2018-04-24

Although computer-aided design and computer-aided manufacturing (CAD-CAM) complete removable dental prostheses (CRDPs) have gained popularity, conventional impressions are still common for CAD-CAM CRDP treatment. These need to be digitized and converted into virtual edentulous casts with a laboratory impression scan protocol during prosthesis fabrication. How this can best be accomplished is unclear. The purpose of this in vitro study was to compare the accuracy and reproducibility of virtual edentulous casts created by a dental laboratory laser scanner and a cone-beam computed tomography (CBCT) scanner with a digitized master cast. A master cast was digitized as the virtual reference cast. Ten polyvinyl siloxane impressions were made on the master cast and scanned with the dental laboratory laser scanner and CBCT scanner. The impressions were sprayed with antiglare spray and rescanned. Four groups of virtual study casts (N=40) were created from the impression scans. All virtual study casts and the reference cast were registered with surface-matching software, and the root mean square (RMS) values (representation of overall accuracy) and percentage of measurement data points within 1 standard deviation (SD) of mean RMS values (%, representation of overall reproducibility) among the 4 study groups were measured. Additionally, 95 numeric distance differences (representation of accuracy at each region) were measured in 5 distinct regions: the apex of the denture border, 6 mm from denture border, crest of the ridge, palate, and posterior palatal seal. The repeated-measures ANOVA and post hoc test (t grouping) were used to determine statistical differences (α=.05). The laboratory scanner group had a significantly larger RMS value (4.0 ±0.3 μm, Pvirtual edentulous casts, and the antiglare spray only significantly improved the accuracy and reproducibility of virtual edentulous casts created by the dental laboratory laser scanner. The accuracy of the virtual edentulous

Accuracy of a new ring-opening metathesis elastomeric dental impression material with spray and immersion disinfection.

Science.gov (United States)

Kronström, Mats H; Johnson, Glen H; Hompesch, Richard W

2010-01-01

was 0.040 mm greater in diameter than MD. The accuracy of gypsum working casts and working dies from the new and 2 existing types of impression material were similar, for both spray and immersion disinfection. Judicious application of a die spacer can compensate for the small differences observed. VPS may require additional laboratory accommodation to compensate for a shorter working die. Copyright 2010 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

Custom CAD-CAM healing abutment and impression coping milled from a poly(methyl methacrylate) block and bonded to a titanium insert.

Science.gov (United States)

Proussaefs, Periklis

2016-11-01

This article describes a technique in which a custom-made computer-aided design and computer-aided manufacturing (CAD-CAM) healing abutment milled from a poly(methyl methacrylate) (PMMA) block is fabricated and bonded to a titanium metal insert. An impression is made during dental implant surgery, and the CAD-CAM custom-made healing abutment is fabricated before second-stage surgery while appropriate healing time is allowed for the dental implant to osseointegrate. The contours of the healing abutment are based on the contours of a tentatively designed definitive prosthesis. The healing tissue obtains contours that will be compatible with the contours of the definitive prosthesis. After the milling process is complete, a titanium metal insert is bonded to the healing abutment. Placement of the custom-made CAD-CAM healing abutment at second-stage surgery allows the tissue to obtain contours similar to those of the definitive prosthesis. A custom-made CAD-CAM impression coping milled from a PMMA block and with a titanium insert is used for the definitive impression after the soft tissue has healed. This technique allows guided soft tissue healing by using a custom-made CAD-CAM healing abutment and impression coping. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Digital assessment of preliminary impression accuracy for edentulous jaws: Comparisons of 3-dimensional surfaces between study and working casts.

Science.gov (United States)

Matsuda, Takashi; Goto, Takaharu; Kurahashi, Kosuke; Kashiwabara, Toshiya; Watanabe, Megumi; Tomotake, Yoritoki; Nagao, Kan; Ichikawa, Tetsuo

2016-07-01

The aim of this study was to compare 3-dimensional surfaces of study and working casts for edentulous jaws and to evaluate the accuracy of preliminary impressions with a view to the future application of digital dentistry for edentulous jaws. Forty edentulous volunteers were serially recruited. Nine dentists took preliminary and final impressions in a routine clinical work-up. The study and working casts were digitized using a dental 3-dimensional scanner. The two surface images were superimposed through a least-square algorithm using imaging software and compared qualitatively. Furthermore, the surface of each jaw was divided into 6 sections, and the difference between the 2 images was quantitatively evaluated. Overall inspection showed that the difference around residual ridges was small and that around borders were large. The mean differences in the upper and lower jaws were 0.26mm and 0.45mm, respectively. The maximum values of the differences showed that the upward change mainly occurred in the anterior residual ridge, and the downward change mainly in the posterior border seal, and the labial and buccal vestibules, whereas every border of final impression was shortened in the lower jaw. The accuracy in all areas except the border, which forms the foundation, was estimated to be less than 0.25mm. Using digital technology, we here showed the overall and sectional accuracy of the preliminary impression for edentulous jaws. In our clinic, preliminary impressions have been made using an alginate material while ensuring that the requisite impression area was covered. Copyright © 2016 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.

Dentistry proteomics: from laboratory development to clinical practice.

Science.gov (United States)

Rezende, Taia M B; Lima, Stella M F; Petriz, Bernardo A; Silva, Osmar N; Freire, Mirna S; Franco, Octávio L

2013-12-01

Despite all the dental information acquired over centuries and the importance of proteome research, the cross-link between these two areas only emerged around mid-nineties. Proteomic tools can help dentistry in the identification of risk factors, early diagnosis, prevention, and systematic control that will promote the evolution of treatment in all dentistry specialties. This review mainly focuses on the evolution of dentistry in different specialties based on proteomic research and how these tools can improve knowledge in dentistry. The subjects covered are an overview of proteomics in dentistry, specific information on different fields in dentistry (dental structure, restorative dentistry, endodontics, periodontics, oral pathology, oral surgery, and orthodontics) and future directions. There are many new proteomic technologies that have never been used in dentistry studies and some dentistry areas that have never been explored by proteomic tools. It is expected that a greater integration of these areas will help to understand what is still unknown in oral health and disease. Copyright © 2013 Wiley Periodicals, Inc.

Ethical advertising in dentistry.

Science.gov (United States)

Graskemper, Joseph P

2009-01-01

Advertising in dentistry has steadily increased since the 1970s to become a leading choice of many dentists to promote their practices. The manner in which advertising progresses within the profession affects all dentists and how patients perceive dentistry as a profession. This paper presents ethical concepts that should be followed when dentists are pursuing practice promotion through advertising. It also raises questions that, hopefully, will increase attention and discussion on dental advertising. The paper concludes that ethical advertising is easily achieved by promoting patient education while not placing the dentist's self-interests ahead of the patient's. With this approach, dentistry may continue to be one of the most trusted professions.

[Precision of digital impressions with TRIOS under simulated intraoral impression taking conditions].

Science.gov (United States)

Yang, Xin; Sun, Yi-fei; Tian, Lei; Si, Wen-jie; Feng, Hai-lan; Liu, Yi-hong

2015-02-18

To evaluate the precision of digital impressions taken under simulated clinical impression taking conditions with TRIOS and to compare with the precision of extraoral digitalizations. Six #14-#17 epoxy resin dentitions with extracted #16 tooth preparations embedded were made. For each artificial dentition, (1)a silicone rubber impression was taken with individual tray, poured with type IV plaster,and digitalized with 3Shape D700 model scanner for 10 times; (2) fastened to a dental simulator, 10 digital impressions for each were taken with 3Shape TRIOS intraoral scanner. To assess the precision, best-fit algorithm and 3D comparison were conducted between repeated scan models pairwise by Geomagic Qualify 12.0, exported as averaged errors (AE) and color-coded diagrams. Non-parametric analysis was performed to compare the precisions of digital impressions and model images. The color-coded diagrams were used to show the deviations distributions. The mean of AE for digital impressions was 7.058 281 μm, which was greater than that of 4.092 363 μm for the model images (Pimpressions were no more than 10 μm, which meant that the consistency between the digital impressions was good. The deviations distribution was uniform in the model images,while nonuniform in the digital impressions with greater deviations lay mainly around the shoulders and interproximal surfaces. Digital impressions with TRIOS are of good precision and up to the clinical standard. Shoulders and interproximal surfaces scanning are more difficult.

Dentistry to the rescue of missing children: A review

Science.gov (United States)

Vij, Nitika; Kochhar, Gulsheen Kaur; Chachra, Sanjay; Kaur, Taranjot

2016-01-01

Today's society is becoming increasingly unsafe for children: we frequently hear about new incidents of missing children, which lead to emotional trauma for the loved ones and expose systemic failures of law and order. Parents can take extra precautions to ensure the safety of their children by educating them about ways to protect themselves and keep important records of the child such as updated color photographs, fingerprints, deoxyribonucleic acid (DNA) samples, etc., handy. However, in spite of all efforts, the problem of missing children still remains. Developments in the field of dentistry have empowered dentists with various tools and techniques to play a pivotal role in tracing a missing child. One such tool is Toothprints, a patented arch-shaped thermoplastic dental impression wafer developed by Dr. David Tesini, a paediatric dentist from Massachusetts. Toothprints enables a unique identification of the missing children not only through the bite impression but also through salivary DNA. Besides the use of Toothprints, a dentist can assist investigating agencies in identifying the missing children in multiple ways, including postmortem dental profiling, labeled dental fixtures, DNA extraction from teeth, and serial number engraving on the children's teeth. More importantly, all these tools cause minimal inconvenience to the individual, making a dentist's role in tracking a missing child even more significant. Thus, the simple discipline of maintaining timely dental records with the help of their dentists can save potential hassles for the parents in the future. PMID:27051216

Dentistry to the rescue of missing children: A review.

Science.gov (United States)

Vij, Nitika; Kochhar, Gulsheen Kaur; Chachra, Sanjay; Kaur, Taranjot

2016-01-01

Today's society is becoming increasingly unsafe for children: we frequently hear about new incidents of missing children, which lead to emotional trauma for the loved ones and expose systemic failures of law and order. Parents can take extra precautions to ensure the safety of their children by educating them about ways to protect themselves and keep important records of the child such as updated color photographs, fingerprints, deoxyribonucleic acid (DNA) samples, etc., handy. However, in spite of all efforts, the problem of missing children still remains. Developments in the field of dentistry have empowered dentists with various tools and techniques to play a pivotal role in tracing a missing child. One such tool is Toothprints, a patented arch-shaped thermoplastic dental impression wafer developed by Dr. David Tesini, a paediatric dentist from Massachusetts. Toothprints enables a unique identification of the missing children not only through the bite impression but also through salivary DNA. Besides the use of Toothprints, a dentist can assist investigating agencies in identifying the missing children in multiple ways, including postmortem dental profiling, labeled dental fixtures, DNA extraction from teeth, and serial number engraving on the children's teeth. More importantly, all these tools cause minimal inconvenience to the individual, making a dentist's role in tracking a missing child even more significant. Thus, the simple discipline of maintaining timely dental records with the help of their dentists can save potential hassles for the parents in the future.

[Research Progress on Forensic Dentistry].

Science.gov (United States)

Liu, F; Dang, Y H

2017-04-01

Forensic dentistry is an interdiscipline of forensic medicine and stomatology, which provides legal information by collecting, testing and assessing the dental evidence scientifically. In this review, the present application of forensic dentistry has been described, such as the estimation of age, sex, species, occupation and living habit, as well as the identification of individual, domestic violence or abuse, which aims to enrich and improve forensic dentistry for making it be more useful in forensic medicine even in juridical practice. Copyright© by the Editorial Department of Journal of Forensic Medicine.

Dosimetry in dentistry.

Science.gov (United States)

Asha, M L; Chatterjee, Ingita; Patil, Preeti; Naveen, S

2015-01-01

The purpose of this paper was to review various dosimeters used in dentistry and the cumulative results of various studies done with various dosimeters. Several relevant PubMed indexed articles from 1999 to 2013 were electronically searched by typing "dosimeters", "dosimeters in dentistry", "properties of dosimeters", "thermoluminescent and optically stimulated dosimeters", "recent advancements in dosimetry in dentistry." The searches were limited to articles in English to prepare a concise review on dental dosimetry. Titles and abstracts were screened, and articles that fulfilled the criteria of use of dosimeters in dental applications were selected for a full-text reading. Article was divided into four groups: (1) Biological effects of radiation, (2) properties of dosimeters, (3) types of dosimeters and (4) results of various studies using different dosimeters. The present review on dosimetry based on various studies done with dosimeters revealed that, with the advent of radiographic technique the effective dose delivered is low. Therefore, selection of radiological technique plays an important role in dental dose delivery.

Brexit and dentistry.

Science.gov (United States)

Sinclair, E; Stagnell, S; Shah, S

2016-05-27

On 23 June 2016, eligible UK voters will be asked to decide whether to vote in the EU referendum. The EU impacts on our daily lives in more ways than many people realise. Dentistry is affected by EU legislation. Examples include the movement of dental professionals, the import of dental equipment and materials, as well as health and safety legislation. Many more EU dentists and DCPs come to the UK to work than vice versa. These numbers have increased markedly since 2004. The result of the vote may affect how dentistry operates in the UK in future years. In addition, a vote to stay would not necessarily prevent change. There are attempts underway to increase the ease by which professionals can work in other member states, especially on a temporary basis. This too is likely affect dentistry at some point. Workforce planners and policy makers should factor in the impact of the EU in future dental policy.

The effect of disinfection of alginate impressions with 35% beetle juice spray on stone model linear dimensional changes

Directory of Open Access Journals (Sweden)

Anggra Yudha Ramadianto

2007-07-01

Full Text Available Dimensional stability of alginate impression is very important for treatment in dentistry. This study was to find the effect of the beetle juice spray procedure on alginate impression on gypsum model linear dimensional changes. This experimental study used 25 samples, divided into 5 groups. The first group, as control, were the alginate impressions filled with dental stone immediately after forming. The other four groups were the alginate impressions gel spray each 1,2,3, and 4 times with 35% beetle juice and then filled with dental stone. Dimensional changes were measured in the lower part of the plaster model from buccal-lingual and mesial-distal direction and also measured in the outer distance between the upper part of the stone model by using Mitutoyo digital micrometre and profile projector scaled 0,001 mm. The results of mesial-distal diameter average of the control group and group 2,3,4, and 5 were 9.909 mm, 9.852 mm, 9.845 mm, 9.824 mm, and 9.754 mm. Meanwhile, the results of buccal-lingual diameter average were 9.847 mm, 9.841 mm, 9.826 mm, 9.776 mm, and 9.729 mm. The results of the outer distance between the upper part of the stone model were 31.739 mm, 31.689 mm, 31.682 mm, 31.670 mm, and 31.670 mm. The data of this study was evaluated statistically based on the variant analysis. The conclusion of this study was statistically, there was no significant effect on gypsum model linear dimensional changes obtained from alginate impressions sprayed with 35% beetle juice.

In Vitro Comparative Evaluation of Different Types of Impression Trays and Impression Materials on the Accuracy of Open Tray Implant Impressions: A Pilot Study

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Sonam Gupta

2017-01-01

Full Text Available Purpose. For a precise fit of multiple implant framework, having an accurate definitive cast is imperative. The present study evaluated dimensional accuracy of master casts obtained using different impression trays and materials with open tray impression technique. Materials and Methods. A machined aluminum reference model with four parallel implant analogues was fabricated. Forty implant level impressions were made. Eight groups (n=5 were tested using impression materials (polyether and vinylsiloxanether and four types of impression trays, two being custom (self-cure acrylic and light cure acrylic and two being stock (plastic and metal. The interimplant distances were measured on master casts using a coordinate measuring machine. The collected data was compared with a standard reference model and was statistically analyzed using two-way ANOVA. Results. Statistically significant difference (p0.05 was observed between varied stock and custom trays. Conclusions. The polyether impression material proved to be more accurate than vinylsiloxanether impression material. The rigid nonperforated stock trays, both plastic and metal, could be an alternative for custom trays for multi-implant impressions when used with medium viscosity impression materials.

The evidence-based dentistry initiative at Baylor College of Dentistry.

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Jones, Daniel L; Hinton, Robert J; Dechow, Paul C; Abdellatif, Hoda; McCann, Ann L; Schneiderman, Emet D; D'Souza, Rena

2011-02-01

This report describes the impact of an R25 Oral Health Research Education Grant awarded to the Texas A&M Health Science Center-Baylor College of Dentistry (BCD) to promote the application of basic and clinical research findings to clinical training and encourage students to pursue careers in oral health research. At Baylor, the R25 grant supports a multi-pronged initiative that employs clinical research as a vehicle for acquainting both students and faculty with the tools of evidence-based dentistry (EBD). New coursework and experiences in all 4 years of the curriculum plus a variety of faculty development offerings are being used to achieve this goal. Progress on these fronts is reflected in a nascent "EBD culture" characterized by increasing participation and buy-in by students and faculty. The production of a new generation of dental graduates equipped with the EBD skill set as well as a growing nucleus of faculty who can model the importance of evidence-based practice is of paramount importance for the future of dentistry.

Plasma in dentistry: a review of basic concepts and applications in dentistry.

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Kim, Jae-Hoon; Lee, Mi-Ae; Han, Geum-Jun; Cho, Byeong-Hoon

2014-01-01

Plasma-related technologies are essential in modern industries. Recently, plasma has attracted increased attention in the biomedical field. This paper provides a basic knowledge of plasma and a narrative review of plasma applications in dentistry. To review plasma applications in dentistry, an electronic search in PubMed, SCOPUS and Google scholar up to December 2012 was done. This was followed by extensive hand searching using reference lists from relevant articles. There have been attempts to apply plasma technology in various fields of dentistry including surface modifications of dental implants, adhesion, caries treatment, endodontic treatment and tooth bleaching. Although many studies were in early stages, the potential value of plasma for dental applications has been demonstrated. To enlarge the scope of plasma applications and put relevant research to practical use, interdisciplinary research with participation of dental professionals is required.

Two-step impression/ injection, an alternative putty/ wash impression technique: case report.

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Caputi, S; Murmura, G; Sinjari, B; Varvara, G

2012-01-01

We here describe a new technique for making a definitive impression that we refer to as the two-step impression/injection technique. This technique initially follows the classical one-step putty/ light-body impression technique with the polymerization of the putty and the light-body compound. This is then followed by the second step: injection of extra-light-body compound into the preparation through a hole in the metal stock tray. The aim of this additional step is to control the wash bulk and minimize the changes that can produce unfavorable impression results. This new two-step impression/injection technique allows displacement of soft tissues, such as the tongue, during the first seating of the putty and wash materials, while in the second step, the extra-light-body compound records all of the finer details without being compressed.

A Comparative Evaluation of the Linear Dimensional Accuracy of Four Impression Techniques using Polyether Impression Material.

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Manoj, Smita Sara; Cherian, K P; Chitre, Vidya; Aras, Meena

2013-12-01

There is much discussion in the dental literature regarding the superiority of one impression technique over the other using addition silicone impression material. However, there is inadequate information available on the accuracy of different impression techniques using polyether. The purpose of this study was to assess the linear dimensional accuracy of four impression techniques using polyether on a laboratory model that simulates clinical practice. The impression material used was Impregum Soft™, 3 M ESPE and the four impression techniques used were (1) Monophase impression technique using medium body impression material. (2) One step double mix impression technique using heavy body and light body impression materials simultaneously. (3) Two step double mix impression technique using a cellophane spacer (heavy body material used as a preliminary impression to create a wash space with a cellophane spacer, followed by the use of light body material). (4) Matrix impression using a matrix of polyether occlusal registration material. The matrix is loaded with heavy body material followed by a pick-up impression in medium body material. For each technique, thirty impressions were made of a stainless steel master model that contained three complete crown abutment preparations, which were used as the positive control. Accuracy was assessed by measuring eight dimensions (mesiodistal, faciolingual and inter-abutment) on stone dies poured from impressions of the master model. A two-tailed t test was carried out to test the significance in difference of the distances between the master model and the stone models. One way analysis of variance (ANOVA) was used for multiple group comparison followed by the Bonferroni's test for pair wise comparison. The accuracy was tested at α = 0.05. In general, polyether impression material produced stone dies that were smaller except for the dies produced from the one step double mix impression technique. The ANOVA revealed a highly

An in vitro comparison of the accuracy of implant impressions with coded healing abutments and different implant angulations.

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Al-Abdullah, Khaled; Zandparsa, Roya; Finkelman, Matthew; Hirayama, Hiroshi

2013-08-01

abutment impression group was higher than the corresponding median of the control group (OTSC) for every combination of angulation and position. Kruskal-Wallis tests indicated a statistically significant difference (Pimpressions were found to be less accurate than those fabricated from the open tray with splinted impression copings technique for restoring 2 paired (10 or 30 degrees) convergent internal connection implants with nonengaging screw-retained splinted 2-unit implant restorations. Accuracy of fit was not influenced by the implant angulation or position for either impression technique or by the Encode healing abutment height for the Encode impression technique. Copyright © 2013 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Mosby, Inc. All rights reserved.

[The elementary discussion on digital implant dentistry].

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Su, Y C

2016-04-09

It is a digital age today. Exposed to all kinds of digital products in many fields. Certainly, implant dentistry is not exception. Digitalization could improve the outcomes and could decrease the complications of implant dentistry. This paper introduces the concepts, definitions, advantages, disadvantages, limitations and errors of digital implant dentistry.

Dental traumatology: an orphan in pediatric dentistry?

DEFF Research Database (Denmark)

Andreasen, Jens Ove; Lauridsen, Eva; Daugaard-Jensen, Jette

2009-01-01

Traumatic dental injuries are very frequent during childhood and adolescence. In fact, 2 out of 3 children have suffered a traumatic dental injury before adulthood. This fact links dental traumatology to pediatric dentistry. Unfortunately, this is not reflected by active participation by pediatric...... dentists in acute treatment, follow-up, and research. To examine the status of pediatric dentistry in relation to dental trauma, a publication analysis was undertaken in 1980, 1990, 2000, and 2007 about trauma articles published in 4 pediatric journals: journal of Dentistry for Children, Pediatric...... Dentistry, The journal of Pedodontics, and the International journal of Pediatric Dentistry. This study shows an average publication rate of trauma articles of approximately 3 percent of all articles published and with no improvement in later decennia. If only clinical studies are considered (leaving out...

Fit of lithium disilicate crowns fabricated from conventional and digital impressions assessed with micro-CT.

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Kim, Jae-Hyun; Jeong, Ji-Hye; Lee, Jin-Han; Cho, Hye-Won

2016-10-01

Although the number of lithium disilicate crowns fabricated with computer-aided design and computer-aided manufacturing (CAD-CAM) technology has increased, the accuracy of the prostheses produced by using digital pathways remains unknown. The purpose of this in vitro study was to compare marginal and internal discrepancies of lithium disilicate crowns fabricated from digital and conventional impressions. A typodont mandibular first molar was prepared for a lithium disilicate crown, and 20 duplicate dies were fabricated by milling poly(methyl methacrylate) resin blocks from laboratory scans. Four groups of 5 lithium disilicate crowns each were created by using a CS3500 (Carestream Dental) intraoral digital impression; Trios (3shape) intraoral digital impression; Ceramill Map400 (Amann Girrbach) extraoral digital impression; and a heat-press technique as a control group. All of the IPS e.max CAD (Ivoclar Vivadent AG) crowns were produced using a 5-axis milling engine (Ceramill Motion2). The lithium disilicate crowns were cemented with zinc phosphate cement under finger pressure. Marginal and internal discrepancies were measured using micro-computed tomography (SkyScan1172). One-way ANOVAs with the Tukey honest significant differences test were used for statistical analysis of the data (α=.05). The mean marginal discrepancies of CS3500 lithium disilicate crowns were 129.6 μm, 200.9 μm for Ceramill Map400, and 207.8 μm 176.1 μm for the heat-press technique; and the internal discrepancy volumes for CS3500 were 25.3 mm 3 , 40.7 mm 3 for Trios, 29.1 mm 3 for Ceramill Map400, and 29.1 and 31.4 mm 3 for the heat-press technique. The CS3500 group showed a significantly better marginal discrepancy than the other 3 groups and a smaller internal discrepancy volume than the Trios group (Pdigital impressions, whereas no differences were found between IPS e.max CAD crowns produced from an extraoral digital impression and IPS e.max Press crowns produced using a heat

Impression Generation of Indonesian Cultural Paintings for Mobile Application with Culture Dependent Color-Impression Metric Creation Contents

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Devira Nanda Kuswhara

2014-06-01

Full Text Available Painting is one of complex image reflecting observations and feelings of the artist to the environment. This condition extends the need of painting impression generation system since common people with lack of art experience would have difficulties to interpret the painting. From this point of view we presents a new model to provide representative impressions of paintings by providing a color-impression metric taken from public survey and implement it for mobile application. The new model provides analytical functions to generate the representative impression of the image query. The functions consist of two main section: (1 The cultural-dependent color-impression metric creation which consist of conducting survey, applying normalized 3D color vector quantization to image dataset, generating image-impression metric, and generating color- impression metric; and (2 Impression generation of image query which consist of applying normalized 3D color vector quantization to image query and measuring the similarity between image query andcolor-impression metric. To perform our proposed impression generation system, we examine our system with Indonesian cultural image dataset and 5 different mobile devices. Our proposed system performs main color impression precision result with average precision of more than 60%. Brightness intensity and zooming affects the retrieved impressions. Rotating captures of an image generate the same retrieved impressions. The system also performs average response time vary in range 41263 to 117434 milliseconds from all devices. Keywords: impression generation system, color based impression, cultural computing, mobile application.

Impression block with orientator

International Nuclear Information System (INIS)

Brilin, V I; Ulyanova, O S

2015-01-01

Tool review, namely the impression block, applied to check the shape and size of the top of fish as well as to determine the appropriate tool for fishing operation was realized. For multiple application and obtaining of the impress depth of 3 cm and more, the standard volumetric impression blocks with fix rods are used. However, the registered impress of fish is not oriented in space and the rods during fishing are in the extended position. This leads to rods deformation and sinking due to accidental impacts of impression block over the borehole irregularity and finally results in faulty detection of the top end of fishing object in hole. The impression blocks with copy rods and fixed magnetic needle allow estimating the object configuration and fix the position of magnetic needle determining the position of the top end of object in hole. However, the magnetic needle fixation is realized in staged and the rods are in extended position during fishing operations as well as it is in standard design. The most efficient tool is the impression block with copy rods which directs the examined object in the borehole during readings of magnetic needles data from azimuth plate and averaging of readings. This significantly increases the accuracy of fishing toll direction. The rods during fishing are located in the body and extended only when they reach the top of fishing object

A Comparative Evaluation of the Linear Dimensional Accuracy of Four Impression Techniques using Polyether Impression Material

OpenAIRE

Manoj, Smita Sara; Cherian, K. P.; Chitre, Vidya; Aras, Meena

2013-01-01

There is much discussion in the dental literature regarding the superiority of one impression technique over the other using addition silicone impression material. However, there is inadequate information available on the accuracy of different impression techniques using polyether. The purpose of this study was to assess the linear dimensional accuracy of four impression techniques using polyether on a laboratory model that simulates clinical practice. The impression material used was Impregu...

Developing patient safety in dentistry.

Science.gov (United States)

Pemberton, M N

2014-10-01

Patient safety has always been important and is a source of public concern. Recent high profile scandals and subsequent reports, such as the Francis report into the failings at Mid Staffordshire, have raised those concerns even higher. Mortality and significant morbidity associated with the practice of medicine has led to many strategies to help improve patient safety, however, with its lack of associated mortality and lower associated morbidity, dentistry has been slower at systematically considering how patient safety can be improved. Recently, several organisations, researchers and clinicians have discussed the need for a patient safety culture in dentistry. Strategies are available to help improve patient safety in healthcare and deserve further consideration in dentistry.

ETI: Our first impressions

Science.gov (United States)

Harrison, Albert A.; Johnson, Joel T.

2000-06-01

Despite scant or ambiguous information, people are capable of developing comprehensive and detailed impressions. Consequently, if the detection of an electromagnetically-active civilization is announced, many people will rapidly form impressions of what the extraterrestrials and their civilization are "like". First impressions are crucial, not only because of their immediate psychological, social, and political consequences on Earth, but because they can influence the future of interstellar communication. Initial impressions will rest less on hard data than on the nature and tone of the "evidence" that is gleaned from the transmission; the interpretation and dissemination of this evidence; and the hard wiring, psychological programming, cultural conditioning, and social influence processes that shape human perception. We consider how dispositional inferences, implicit theories of personality, negatively toned or adverse information, physical appearance, prior expectations, the confirmation bias, and thinking and unthinking approaches to attitude formation are likely to affect human impressions of ETI.

Comparison of Adaptation between the Major Connectors Fabricated from Intraoral Digital Impressions and Extraoral Digital Impressions.

Science.gov (United States)

Gan, Ning; Ruan, Yaye; Sun, Jian; Xiong, Yaoyang; Jiao, Ting

2018-01-11

The objective was to compare the adaptation between the major connectors of removable partial dentures derived from intraoral digital impressions and extraoral digital impressions. Twenty-four volunteers were enrolled. Each volunteer received an intraoral digital impression and one extraoral digital impression digitized from conventional gypsum impression. A software was used to create the major connectors on digital impression datasets. After all the virtual major connectors designed from Group intraoral digital impressions (Group I) and Group extraoral digital impressions (Group E) were directly fabricated by 3D printing technique, the adaptation of the final major connectors in volunteers' mouths were measured. The adaptation ranged from 159.87 to 577.99 μm in Group I while from 120.83 to 536.17 μm in Group E. The adaptation of major connectors in Group I were found better at the midline palatine suture while the adaptation of major connectors in Group E were found better at the two sides of the palatal vault. In both groups, the highest accuracy in adaptation was revealed at the anterior margin of the major connectors. It is feasible to manufacture the major connectors by digital impression and 3D printing technique. Both the adaptation of the two kinds of digital impressions were clinical acceptable.

Giving the wrong impression: food and beverage brand impressions delivered to youth through popular movies.

Science.gov (United States)

Skatrud-Mickelson, Monica; Adachi-Mejia, Anna M; MacKenzie, Todd A; Sutherland, Lisa A

2012-06-01

Marketing on television showcases less-healthful options, with emerging research suggesting movies promote similar products. Given the obesity epidemic, understanding advertising to youth should be a public health imperative. The objective of this study was to estimate youth impressions to food and beverages delivered through movies. Impressions were calculated by dividing US receipts annually into average movie ticket prices, then multiplying this by the number of brand appearances. Examination by ratings, product types and ages were conducted by Spearman rank correlation coefficient tests. Youth in the USA saw over 3 billion food, beverage or food-retail establishment (FRE) impressions on average, annually from 1996 to 2005. Those aged 12-18 viewed over half of all impressions, with PG-13-rated movies containing 61.5% of impressions. There were no significant trends in brand appearances by food, beverage or FRE impressions over the decade, although there was a decreasing trend in R-rated impressions for both foods (Pbeverages (Pfood and beverage impressions annually to youth. Given the public health crisis of obesity, future research should further investigate these trends, as well as the potential association of these unhealthy exposures in youth.

[The rise and development of general dentistry in China].

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Liu, Hongchen

2016-02-01

General dentistry is an important part of the dental medicine and general dentists and general dentistry form the basis of clinical dental medicine. China's general dentistry has a long history, which started as an independent specialist in the 1990s. At present, the Chinese general dental medicine has received more and more attention as an independent profession. General dental medical model has been rapidly developed in the general hospital department of dentistry, private practice and community dentistry institutions, dental specialist hospitals and so on. In this paper, we will review the rise and development of China's general dentistry, and report its theoretical characteristics, institutional framework, academic progress, member development report, and look forward to its development in the future.

Digital vs. conventional implant impressions: efficiency outcomes.

Science.gov (United States)

Lee, Sang J; Gallucci, German O

2013-01-01

The aim of this pilot study was to evaluate the efficiency, difficulty and operator's preference of a digital impression compared with a conventional impression for single implant restorations. Thirty HSDM second year dental students performed conventional and digital implant impressions on a customized model presenting a single implant. The outcome of the impressions was evaluated under an acceptance criteria and the need for retake/rescan was decided. The efficiency of both impression techniques was evaluated by measuring the preparation, working, and retake/scan time (m/s) and the number of retakes/rescans. Participants' perception on the level of difficulty for the both impressions was assessed with a visual analogue scale (VAS) questionnaire. Multiple questionnaires were obtained to assess the participants' perception on preference, effectiveness and proficiency. Mean total treatment time was of 24:42 m/s for conventional and 12:29 m/s for digital impressions (P impressions (P impression (P impression technique and 30.63 (±17.57) for digital impression technique (P = 0.006). Sixty percent of the participants preferred the digital impression, 7% the conventional impression technique and 33% preferred either technique. Digital impressions resulted in a more efficient technique than conventional impressions. Longer preparation, working, and retake time were consumed to complete an acceptable conventional impression. Difficulty was lower for the digital impression compared with the conventional ones when performed by inexperienced second year dental students. © 2012 John Wiley & Sons A/S.

Quality of Impressions and Work Authorizations Submitted by Dental Students Supervised by Prosthodontists and General Dentists.

Science.gov (United States)

Imbery, Terence A; Diaz, Nicholas; Greenfield, Kristy; Janus, Charles; Best, Al M

2016-10-01

Preclinical fixed prosthodontics is taught by Department of Prosthodontics faculty members at Virginia Commonwealth University School of Dentistry; however, 86% of all clinical cases in academic year 2012 were staffed by faculty members from the Department of General Practice. The aims of this retrospective study were to quantify the quality of impressions, accuracy of laboratory work authorizations, and most common errors and to determine if there were differences between the rate of errors in cases supervised by the prosthodontists and the general dentists. A total of 346 Fixed Prosthodontic Laboratory Tracking Sheets for the 2012 academic year were reviewed. The results showed that, overall, 73% of submitted impressions were acceptable at initial evaluation, 16% had to be poured first and re-evaluated for quality prior to pindexing, 7% had multiple impressions submitted for transfer dies, and 4% were rejected for poor quality. There were higher acceptance rates for impressions and work authorizations for cases staffed by prosthodontists than by general dentists, but the differences were not statistically significant (p=0.0584 and p=0.0666, respectively). Regarding the work authorizations, 43% overall did not provide sufficient information or had technical errors that delayed prosthesis fabrication. The most common errors were incorrect mountings, absence of solid casts, inadequate description of margins for porcelain fused to metal crowns, inaccurate die trimming, and margin marking. The percentages of errors in cases supervised by general dentists and prosthodontists were similar for 17 of the 18 types of errors identified; only for margin description was the percentage of errors statistically significantly higher for general dentist-supervised than prosthodontist-supervised cases. These results highlighted the ongoing need for faculty development and calibration to ensure students receive the highest quality education from all faculty members teaching fixed

Accuracy of a new elastomeric impression material for complete-arch dental implant impressions.

Science.gov (United States)

Baig, Mirza R; Buzayan, Muaiyed M; Yunus, Norsiah

2018-05-01

The aim of the present study was to assess the accuracy of multi-unit dental implant casts obtained from two elastomeric impression materials, vinyl polyether silicone (VPES) and polyether (PE), and to test the effect of splinting of impression copings on the accuracy of implant casts. Forty direct impressions of a mandibular reference model fitted with six dental implants and multibase abutments were made using VPES and PE, and implant casts were poured (N = 20). The VPES and PE groups were split into four subgroups of five each, based on splinting type: (a) no splinting; (b) bite registration polyether; (c) bite registration addition silicone; and (d) autopolymerizing acrylic resin. The accuracy of implant-abutment replica positions was calculated on the experimental casts, in terms of interimplant distances in the x, y, and z-axes, using a coordinate measuring machine; values were compared with those measured on the reference model. Data were analyzed using non-parametrical Kruskal-Wallis and Mann-Whitney tests at α = .05. The differences between the two impression materials, VPES and PE, regardless of splinting type, were not statistically significant (P>.05). Non-splinting and splinting groups were also not significantly different for both PE and VPES (P>.05). The accuracy of VPES impression material seemed comparable with PE for multi-implant abutment-level impressions. Splinting had no effect on the accuracy of implant impressions. © 2018 John Wiley & Sons Australia, Ltd.

Informed Consent in Dentistry.

Science.gov (United States)

Reid, Kevin I

2017-03-01

A review of literature regarding informed consent in dentistry reveals a paucity of information and minimal scholarship devoted to this subject. But this begs the question about informed consent somehow being different for dentistry than for medicine or other healthcare delivery. My account draws distinctions where appropriate but is rooted in the premise that informed consent is an ethical construct applicable to vulnerable people as patients independent of what type of treatment or body part being considered. This paper highlights the crucial importance of the process of informed consent and refusal in dentistry, underscoring its important place in oral healthcare. This paper will not address the unique circumstances involving consent in those without capacity or focus on informed consent in the research setting; our focus will be on those patients with full decisionmaking capacity in the clinical setting. I will emphasize the importance of disclosure of treatment options and highlight the benefits of shared-decision-making in the informed consent process.

Paediatric dentistry- novel evolvement

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Saleha Shah, B.D.S, MClinDent Paediatric Dentistry (UK

2018-01-01

Full Text Available Pediatric dentistry provides primary and comprehensive preventive and therapeutic oral health care for infants and children through adolescence, together with special health care needs. This specialty encompasses a variety of skills, disciplines, procedures and techniques that share a common origin with other dental specialties however these have been modified and reformed to the distinctive requirements of infants, children, adolescents and special health care needs. Disciplines comprise of behavior guidance, care of the medically and developmentally compromised and disabled patient, supervision of orofacial growth and development, caries prevention, sedation, pharmacological management, and hospital dentistry including other traditional fields of dentistry. The skills apply to the ever-changing stages of dental, physical, and psychosocial development for treating conditions and diseases distinctive to growing individuals. Hence with the changing scope of practice it is imperative that the clinician stays updated with the current evidence based trends in practice, collaborates with other disciplines and Imparts quality oral health care tailored to the specific needs of every child.

Giving the wrong impression: food and beverage brand impressions delivered to youth through popular movies

Science.gov (United States)

Skatrud-Mickelson, Monica; Adachi-Mejia, Anna M.; MacKenzie, Todd A.; Sutherland, Lisa A.

2012-01-01

Background Marketing on television showcases less-healthful options, with emerging research suggesting movies promote similar products. Given the obesity epidemic, understanding advertising to youth should be a public health imperative. The objective of this study was to estimate youth impressions to food and beverages delivered through movies. Methods Impressions were calculated by dividing US receipts annually into average movie ticket prices, then multiplying this by the number of brand appearances. Examination by ratings, product types and ages were conducted by Spearman rank correlation coefficient tests. Results Youth in the USA saw over 3 billion food, beverage or food–retail establishment (FRE) impressions on average, annually from 1996 to 2005. Those aged 12–18 viewed over half of all impressions, with PG-13-rated movies containing 61.5% of impressions. There were no significant trends in brand appearances by food, beverage or FRE impressions over the decade, although there was a decreasing trend in R-rated impressions for both foods (P< 0.01) and beverages (P< 0.01), but not FREs (P= 0.08). Conclusions Movies promote billions of food and beverage impressions annually to youth. Given the public health crisis of obesity, future research should further investigate these trends, as well as the potential association of these unhealthy exposures in youth. PMID:22076600

History of Dentistry in Central Serbia

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Jeremic Marko

2016-11-01

Full Text Available History of dentistry in the Central Serbian District of Jagodina has been influenced by traditional medicine for centuries. Development of dentistry in the region of Jagodina was slow, the level of oral and general hygiene was low and the sanitary prevention was absent. Trained physicians started to practice medicine and dentistry in the first half of the nineteenth century and they were educated in abroad universities. However, common people used to address to these physicians only when the traditional medicine were unable to help. Until the end of the World War II, common, mostly rural people, with the urgent dental treatment need were usually referred to the barbers, healers or empirics in the nearby villages rather than the dentists. Medications used for the urgent dental treatment were balsams and solutions made of herbs. After the World War II, the dental technicians who finished special courses started to practice dentistry. In 1947 the Regional Dental Office in Jagodina was opened and in 1955 the first Doctor of Dental Medicine who graduated from the School of Dental Medicine of University of Belgrade was employed. Nowadays, the Department of Dentistry represents is an important and independent part of the Health Care Centre in Jagodina.

A clinical comparison of cordless and conventional displacement systems regarding clinical performance and impression quality.

Science.gov (United States)

Acar, Özlem; Erkut, Selim; Özçelik, Tuncer Burak; Ozdemır, Erdem; Akçil, Mehtap

2014-05-01

It is not clear whether newly introduced cordless displacement systems are better able to manage gingiva than conventional systems. The purpose of this in vivo study was to evaluate the gingival management ability of 4 different displacement methods with a standardized subgingival preparation finish line. The effects of 4 displacement techniques on gingival management and impression quality were evaluated by means of 6 evaluation criteria. A subgingival preparation finish line of between 1 and 2 mm was ensured, and the buccal aspects of 252 (n=63) teeth were clinically assessed for ease of application, time spent, bleeding, remnants, and dilatation. The complete reproduction of the preparation finish line and the bubble and void formations on polyether impressions were also evaluated. The data were statistically analyzed with the χ(2) test (α=.05). The Bonferroni correction was used to control Type I error for the pairwise comparison groups (α=.008). Statistically significant differences were found for all criteria among the groups (Pimpression quality (Pimpression quality (P>.008). The retraction cap with paste group showed better results for ease of application, time spent, and bleeding than the aluminum chloride impregnated cord group (Pimpression qualities. Copyright © 2014 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Accuracy of Digital Impressions and Fitness of Single Crowns Based on Digital Impressions

Science.gov (United States)

Yang, Xin; Lv, Pin; Liu, Yihong; Si, Wenjie; Feng, Hailan

2015-01-01

In this study, the accuracy (precision and trueness) of digital impressions and the fitness of single crowns manufactured based on digital impressions were evaluated. #14-17 epoxy resin dentitions were made, while full-crown preparations of extracted natural teeth were embedded at #16. (1) To assess precision, deviations among repeated scan models made by intraoral scanner TRIOS and MHT and model scanner D700 and inEos were calculated through best-fit algorithm and three-dimensional (3D) comparison. Root mean square (RMS) and color-coded difference images were offered. (2) To assess trueness, micro computed tomography (micro-CT) was used to get the reference model (REF). Deviations between REF and repeated scan models (from (1)) were calculated. (3) To assess fitness, single crowns were manufactured based on TRIOS, MHT, D700 and inEos scan models. The adhesive gaps were evaluated under stereomicroscope after cross-sectioned. Digital impressions showed lower precision and better trueness. Except for MHT, the means of RMS for precision were lower than 10 μm. Digital impressions showed better internal fitness. Fitness of single crowns based on digital impressions was up to clinical standard. Digital impressions could be an alternative method for single crowns manufacturing. PMID:28793417

Accuracy of Digital Impressions and Fitness of Single Crowns Based on Digital Impressions

Directory of Open Access Journals (Sweden)

Xin Yang

2015-06-01

Full Text Available In this study, the accuracy (precision and trueness of digital impressions and the fitness of single crowns manufactured based on digital impressions were evaluated. #14-17 epoxy resin dentitions were made, while full-crown preparations of extracted natural teeth were embedded at #16. (1 To assess precision, deviations among repeated scan models made by intraoral scanner TRIOS and MHT and model scanner D700 and inEos were calculated through best-fit algorithm and three-dimensional (3D comparison. Root mean square (RMS and color-coded difference images were offered. (2 To assess trueness, micro computed tomography (micro-CT was used to get the reference model (REF. Deviations between REF and repeated scan models (from (1 were calculated. (3 To assess fitness, single crowns were manufactured based on TRIOS, MHT, D700 and inEos scan models. The adhesive gaps were evaluated under stereomicroscope after cross-sectioned. Digital impressions showed lower precision and better trueness. Except for MHT, the means of RMS for precision were lower than 10 μm. Digital impressions showed better internal fitness. Fitness of single crowns based on digital impressions was up to clinical standard. Digital impressions could be an alternative method for single crowns manufacturing.

Substance Use as Impression Management.

Science.gov (United States)

Sharp, Mark J.; Getz, J. Greg

1996-01-01

Examines the function of substance use as an impression management tactic. Introductory psychology students (n=377) responded to a survey instrument measuring self-monitoring, perceived success in impression management, interaction anxiety, and self-esteem. Results suggest that alcohol use may serve an impression management function. (JPS)

What's new in paediatric dentistry?

Science.gov (United States)

Vitale, M. C.

2016-03-01

Since the early 80's, the use of laser has been introduced in the daily dental practice and the technological development has also provided over time to optimize its use. Various types of lasers with different wavelengths have been developed for use in a handy, easy and ergonomic manner. In daily paediatric dentistry, laser could be a very useful medical device which can completely replace the traditional high hand-piece and bur to realize a "micro-invasive" dentistry and a "clean" surgery, without bleeding and sutures. According to the international literature and in the light of recent researches, this work could give an overview on assisted laser therapy in paediatric dentistry, highlighting advantages and disadvantages of this new technology and pointing out the high compliance of the young patient.

Dimensional Accuracy of Hydrophilic and Hydrophobic VPS Impression Materials Using Different Impression Techniques - An Invitro Study

Science.gov (United States)

Pilla, Ajai; Pathipaka, Suman

2016-01-01

Introduction The dimensional stability of the impression material could have an influence on the accuracy of the final restoration. Vinyl Polysiloxane Impression materials (VPS) are most frequently used as the impression material in fixed prosthodontics. As VPS is hydrophobic when it is poured with gypsum products, manufacturers added intrinsic surfactants and marketed as hydrophilic VPS. These hydrophilic VPS have shown increased wettability with gypsum slurries. VPS are available in different viscosities ranging from very low to very high for usage under different impression techniques. Aim To compare the dimensional accuracy of hydrophilic VPS and hydrophobic VPS using monophase, one step and two step putty wash impression techniques. Materials and Methods To test the dimensional accuracy of the impression materials a stainless steel die was fabricated as prescribed by ADA specification no. 19 for elastomeric impression materials. A total of 60 impressions were made. The materials were divided into two groups, Group1 hydrophilic VPS (Aquasil) and Group 2 hydrophobic VPS (Variotime). These were further divided into three subgroups A, B, C for monophase, one-step and two-step putty wash technique with 10 samples in each subgroup. The dimensional accuracy of the impressions was evaluated after 24 hours using vertical profile projector with lens magnification range of 20X-125X illumination. The study was analyzed through one-way ANOVA, post-hoc Tukey HSD test and unpaired t-test for mean comparison between groups. Results Results showed that the three different impression techniques (monophase, 1-step, 2-step putty wash techniques) did cause significant change in dimensional accuracy between hydrophilic VPS and hydrophobic VPS impression materials. One-way ANOVA disclosed, mean dimensional change and SD for hydrophilic VPS varied between 0.56% and 0.16%, which were low, suggesting hydrophilic VPS was satisfactory with all three impression techniques. However, mean

Improvdent: Improving dentures for patient benefit. A crossover randomised clinical trial comparing impression materials for complete dentures

Directory of Open Access Journals (Sweden)

Gray Janine C

2012-08-01

This trial aims to provide evidence on the costs and quality of dentures cast from two different commonly used impression materials; the intention is to significantly impact on the quality of denture production within NHS dentistry. Trial Registration ISRCTN Register: ISRCTN01528038 UKCRN Portfolio ID: 8305

Advances of Proteomic Sciences in Dentistry.

Science.gov (United States)

Khurshid, Zohaib; Zohaib, Sana; Najeeb, Shariq; Zafar, Muhammad Sohail; Rehman, Rabia; Rehman, Ihtesham Ur

2016-05-13

Applications of proteomics tools revolutionized various biomedical disciplines such as genetics, molecular biology, medicine, and dentistry. The aim of this review is to highlight the major milestones in proteomics in dentistry during the last fifteen years. Human oral cavity contains hard and soft tissues and various biofluids including saliva and crevicular fluid. Proteomics has brought revolution in dentistry by helping in the early diagnosis of various diseases identified by the detection of numerous biomarkers present in the oral fluids. This paper covers the role of proteomics tools for the analysis of oral tissues. In addition, dental materials proteomics and their future directions are discussed.

Effects of implant system, impression technique, and impression material on accuracy of the working cast.

Science.gov (United States)

Wegner, Kerstin; Weskott, Katharina; Zenginel, Martha; Rehmann, Peter; Wöstmann, Bernd

2013-01-01

This in vitro study aimed to identify the effects of the implant system, impression technique, and impression material on the transfer accuracy of implant impressions. The null hypothesis tested was that, in vitro and within the parameters of the experiment, the spatial relationship of a working cast to the placement of implants is not related to (1) the implant system, (2) the impression technique, or (3) the impression material. A steel maxilla was used as a reference model. Six implants of two different implant systems (Standard Plus, Straumann; Semados, Bego) were fixed in the reference model. The target variables were: three-dimensional (3D) shift in all directions, implant axis direction, and rotation. The target variables were assessed using a 3D coordinate measuring machine, and the respective deviations of the plaster models from the nominal values of the reference model were calculated. Two different impression techniques (reposition/pickup) and four impression materials (Aquasil Ultra, Flexitime, Impregum Penta, P2 Magnum 360) were investigated. In all, 80 implant impressions for each implant system were taken. Statistical analysis was performed using multivariate analysis of variance. The implant system significantly influenced the transfer accuracy for most spatial dimensions, including the overall 3D shift and implant axis direction. There was no significant difference between the two implant systems with regard to rotation. Multivariate analysis of variance showed a significant effect on transfer accuracy only for the implant system. Within the limits of the present study, it can be concluded that the transfer accuracy of the intraoral implant position on the working cast is far more dependent on the implant system than on the selection of a specific impression technique or material.

The quality of fixed prosthodontic impressions: An assessment of crown and bridge impressions received at commercial laboratories.

Science.gov (United States)

Rau, Clayton T; Olafsson, Vilhelm G; Delgado, Alex J; Ritter, André V; Donovan, Terry E

2017-09-01

The authors evaluated and quantified clinically detectable errors commonly seen in impressions sent to commercial laboratories and determined possible relationships between finish line errors and other factors involved. The authors visited 3 large and 1 small commercial dental laboratories over a 12-month period. Three calibrated examiners evaluated the impressions. The examiners evaluated all impressions for errors by using ×2.5 magnification loupes under ambient room lighting without the aid of additional illumination. The authors evaluated 1,157 impressions; 86% of the examined impressions had at least 1 detectable error, and 55% of the noted errors were critical errors pertaining to the finish line. The largest single error categories evaluated were tissue over the finish line (49.09%), lack of unprepared stops in dual-arch impressions (25.63%), pressure of the tray on the soft tissue (25.06%), and void at the finish line (24.38%). The factors blood on the impression (odds ratio, 2.31; P impressions evaluated. The authors noted an increase in errors at the finish line with dual-arch impression techniques and in the presence of blood. Dentists have ethical, moral, and legal obligations bestowed on them by the profession and need to evaluate critically the work they send to laboratories. The authors strongly recommend an improvement in technique and reviewing of all impressions and working casts. Published by Elsevier Inc.

Comparison of marginal and internal fit of 3-unit ceramic fixed dental prostheses made with either a conventional or digital impression.

Science.gov (United States)

Su, Ting-Shu; Sun, Jian

2016-09-01

digital impression system were better than those fabricated from conventional impressions. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Accuracy of intraoral digital impressions using an artificial landmark.

Science.gov (United States)

Kim, Jong-Eun; Amelya, Ami; Shin, Yooseok; Shim, June-Sung

2017-06-01

Intraoral scanners have been reported to have limited accuracy in edentulous areas. Large amounts of mobile tissue and the lack of obvious anatomic landmarks make it difficult to acquire a precise digital impression of an edentulous area with an intraoral scanner. The purpose of this in vitro study was to determine the effect of an artificial landmark on a long edentulous space on the accuracy outcomes of intraoral digital impressions. A mandibular model containing 4 prepared teeth and an edentulous space of 26 mm in length was used. A blue-light light-emitting diode tabletop scanner was used as a control scanner, and 3 intraoral scanners were used as experimental groups. Five scans were made using each intraoral scanner without an artificial landmark, and another 5 scans were performed after application of an artificial landmark (a 4×3 mm alumina material) on the edentulous area. The obtained datasets were used to evaluate trueness and precision. Without an artificial landmark on the edentulous area, the mean trueness for the intraoral scanner ranged from 36.1 to 38.8 μm and the mean precision ranged from 13.0 to 43.6 μm. With an artificial landmark on the edentulous area, accuracy was improved significantly: the mean trueness was 26.7 to 31.8 μm, and the mean precision was 9.2 to 12.4 μm. The use of an alumina artificial landmark in an edentulous space improved the trueness and precision of the intraoral scanners tested. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Evaluation of the marginal fit of single-unit, complete-coverage ceramic restorations fabricated after digital and conventional impressions: A systematic review and meta-analysis.

Science.gov (United States)

Tsirogiannis, Panagiotis; Reissmann, Daniel R; Heydecke, Guido

2016-09-01

the marginal discrepancy of single-unit ceramic restorations fabricated after digital or conventional impressions. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Comparison of dimensional accuracy of digital dental models produced from scanned impressions and scanned stone casts

Science.gov (United States)

Subeihi, Haitham

Introduction: Digital models of dental arches play a more and more important role in dentistry. A digital dental model can be generated by directly scanning intraoral structures, by scanning a conventional impression of oral structures or by scanning a stone cast poured from the conventional impression. An accurate digital scan model is a fundamental part for the fabrication of dental restorations. Aims: 1. To compare the dimensional accuracy of digital dental models produced by scanning of impressions versus scanning of stone casts. 2. To compare the dimensional accuracy of digital dental models produced by scanning of impressions made of three different materials (polyvinyl siloxane, polyether or vinyl polyether silicone). Methods and Materials: This laboratory study included taking addition silicone, polyether and vinyl polyether silicone impressions from an epoxy reference model that was created from an original typodont. Teeth number 28 and 30 on the typodont with a missing tooth number 29 were prepared for a metal-ceramic three-unit fixed dental prosthesis with tooth #29 being a pontic. After tooth preparation, an epoxy resin reference model was fabricated by duplicating the typodont quadrant that included the tooth preparations. From this reference model 12 polyvinyl siloxane impressions, 12 polyether impressions and 12 vinyl polyether silicone impressions were made. All 36 impressions were scanned before pouring them with dental stone. The 36 dental stone casts were, in turn, scanned to produce digital models. A reference digital model was made by scanning the reference model. Six groups of digital models were produced. Three groups were made by scanning of the impressions obtained with the three different materials, the other three groups involved the scanning of the dental casts that resulted from pouring the impressions made with the three different materials. Groups of digital models were compared using Root Mean Squares (RMS) in terms of their

Minimum intervention dentistry: periodontics and implant dentistry.

Science.gov (United States)

Darby, I B; Ngo, L

2013-06-01

This article will look at the role of minimum intervention dentistry in the management of periodontal disease. It will discuss the role of appropriate assessment, treatment and risk factors/indicators. In addition, the role of the patient and early intervention in the continuing care of dental implants will be discussed as well as the management of peri-implant disease. © 2013 Australian Dental Association.

Nanomaterials in preventive dentistry

Science.gov (United States)

Hannig, Matthias; Hannig, Christian

2010-08-01

The prevention of tooth decay and the treatment of lesions and cavities are ongoing challenges in dentistry. In recent years, biomimetic approaches have been used to develop nanomaterials for inclusion in a variety of oral health-care products. Examples include liquids and pastes that contain nano-apatites for biofilm management at the tooth surface, and products that contain nanomaterials for the remineralization of early submicrometre-sized enamel lesions. However, the treatment of larger visible cavities with nanomaterials is still at the research stage. Here, we review progress in the development of nanomaterials for different applications in preventive dentistry and research, including clinical trials.

Patients' preferences when comparing analogue implant impressions using a polyether impression material versus digital impressions (Intraoral Scan) of dental implants.

Science.gov (United States)

Wismeijer, Daniel; Mans, Ronny; van Genuchten, Michiel; Reijers, Hajo A

2014-10-01

The primary objective of this clinical study was to assess the patients' perception of the difference between an analogue impression approach on the one hand and an intra-oral scan (IO scan) on the other when restoring implants in the non-aesthetic zone. A second objective was to analyse the difference in time needed to perform these two procedures. Thirty consecutive patients who had received 41 implants (Straumann tissue level) in the non-aesthetic zone in an implant-based referral practice setting in the Netherlands. As they were to receive crown and or bridge work on the implants, in one session, the final impressions were taken with both an analogue technique and with an intraoral scan. Patients were also asked if, directly after the treatment was carried out, they would be prepared to fill out a questionnaire on their perception of both techniques. The time involved following these two procedures was also recorded. The preparatory activities of the treatment, the taste of the impression material and the overall preference of the patients were significantly in favour of the IO scan. The bite registration, the scan head and gag reflex positively tended to the IO scan, but none of these effects were significant. The overall time involved with the IO scan was more negatively perceived than the analogue impression. Overall less time was involved when following the analogue impression technique than with the IO scan. The overall preference of the patients in our sample is significantly in favour of the approach using the IO scan. This preference relates mainly to the differences between the compared approaches with respect to taste effects and their preparatory activities. The patients did perceive the duration of IO scan more negatively than the analogue impression approach. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

3D printing in dentistry.

Science.gov (United States)

Dawood, A; Marti Marti, B; Sauret-Jackson, V; Darwood, A

2015-12-01

3D printing has been hailed as a disruptive technology which will change manufacturing. Used in aerospace, defence, art and design, 3D printing is becoming a subject of great interest in surgery. The technology has a particular resonance with dentistry, and with advances in 3D imaging and modelling technologies such as cone beam computed tomography and intraoral scanning, and with the relatively long history of the use of CAD CAM technologies in dentistry, it will become of increasing importance. Uses of 3D printing include the production of drill guides for dental implants, the production of physical models for prosthodontics, orthodontics and surgery, the manufacture of dental, craniomaxillofacial and orthopaedic implants, and the fabrication of copings and frameworks for implant and dental restorations. This paper reviews the types of 3D printing technologies available and their various applications in dentistry and in maxillofacial surgery.

Ventral impressions on the hypopharynx

International Nuclear Information System (INIS)

Daschner, H.; Hannig, C.

1991-01-01

Two impressions can be seen on the ventral aspect of the hypopharynx and upper oesophagus; on static images it is difficult to differentiate these from small tumours. In order to evaluate this region more accurately, we have examined 150 patients by means of rapid rate cinematography. In 52.6% we found a constant irregular or convex impression formed by the cricoid; in the other cases this was not seen or was quite minimal. In 93% a sub-cricoid impression could be demonstrated which was due to lax mucosa. Characteristically this showed a variable appearance during the passage of a bolus. Only the cricoid impression was associated with dysphagia. (orig.) [de

Accounting Narratives and Impression Management

OpenAIRE

Brennan, Niamh; Merkl-Davies, Doris M.

2013-01-01

This chapter focuses on impression management in accounting communication. Impression management entails the construction of an impression by organisations with the intention to appeal to their audiences, including shareholders, stakeholders, the general public, and the media. If successful, it undermines the quality of financial reporting and capital misallocations may result. What is more, wider social and political consequences include unwarranted support by non-financial...

Influence of abutment tooth geometry on the accuracy of conventional and digital methods of obtaining dental impressions.

Science.gov (United States)

Carbajal Mejía, Jeison B; Wakabayashi, Kazumichi; Nakamura, Takashi; Yatani, Hirofumi

2017-09-01

.43, P=.002). Visual analysis revealed that the intraoral scanner group showed a homogeneous deviation pattern across all TOC angles tested, whereas scans from the PVS and desktop scanner groups showed marked local deviations when undercuts (negative angles) were present. Conventional dental impressions alone or those further digitized with an extraoral digital scanner cannot reliably reproduce abutment tooth preparations when the TOC angle is close to 0 degrees. In contrast, digital impressions made with intraoral scanning can accurately record abutment tooth preparations independently of their geometry. Copyright © 2016 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

Minimally legally invasive dentistry.

Science.gov (United States)

Lam, R

2014-12-01

One disadvantage of the rapid advances in modern dentistry is that treatment options have never been more varied or confusing. Compounded by a more educated population greatly assisted by online information in an increasingly litigious society, a major concern in recent times is increased litigation against health practitioners. The manner in which courts handle disputes is ambiguous and what is considered fair or just may not be reflected in the judicial process. Although legal decisions in Australia follow a doctrine of precedent, the law is not static and is often reflected by community sentiment. In medical litigation, this has seen the rejection of the Bolam principle with a preference towards greater patient rights. Recent court decisions may change the practice of dentistry and it is important that the clinician is not caught unaware. The aim of this article is to discuss legal issues that are pertinent to the practice of modern dentistry through an analysis of legal cases that have shaped health law. Through these discussions, the importance of continuing professional development, professional association and informed consent will be realized as a means to limit the legal complications of dental practice. © 2014 Australian Dental Association.

Photodynamic therapy in dentistry: a literature review.

Science.gov (United States)

Gursoy, Hare; Ozcakir-Tomruk, Ceyda; Tanalp, Jale; Yilmaz, Selçuk

2013-05-01

The purpose of this review was to summarize recent developments regarding photodynamic therapy (PDT) in the field of dentistry. A review of pertinent literature was carried out in PubMED to determine the current position of PDT applications in dentistry. One hundred thirteen relevant articles were retrieved from PubMED by inserting the keywords "photodynamic therapy", "dentistry", "periodontology", "oral surgery", and "endodontics". It is anticipated that this overview will create a specific picture in the practitioner's mind regarding the current status and use of PDT. In spite of different results and suggestions brought about by different researchers, PDT can be considered as a promising and less invasive technique in dentistry. PDT seems to be an effective tool in the treatment of localized and superficial infections. Within the limitations of the present review, it can be concluded that although PDT cannot replace antimicrobial therapy at its current stage, it may be used as an adjunctive tool for facilitating the treatment of oral infections. Oral infections (such as mucosal and endodontic infections, periodontal diseases, caries, and peri-implantitis) are among the specific targets where PDT can be applied. Further long-term clinical studies are necessary in establishing a more specific place of the technique in the field of dentistry.

Biomaterials in Relation to Dentistry.

Science.gov (United States)

Deb, Sanjukta; Chana, Simran

2015-01-01

Dental caries remains a challenge in the improvement of oral health. It is the most common and widespread biofilm-dependent oral disease, resulting in the destruction of tooth structure by the acidic attack from cariogenic bacteria. The tooth is a heavily mineralised tissue, and both enamel and dentine can undergo demineralisation due to trauma or dietary conditions. The adult population worldwide affected by dental caries is enormous and despite significant advances in caries prevention and tooth restoration, treatments continue to pose a substantial burden to healthcare. Biomaterials play a vital role in the restoration of the diseased or damaged tooth structure and, despite providing reasonable outcomes, there are some concerns with clinical performance. Amalgam, the silver grey biomaterial that has been widely used as a restorative material in dentistry, is currently in throes of being phased out, especially with the Minimata convention and treaty being signed by a number of countries (January 2013; http://mercuryconvention.org/Convention/) that aims to control the anthropogenic release of mercury in the environment, which naturally impacts the use of amalgam, where mercury is a component. Thus, the development of alternative restoratives and restoration methods that are inexpensive, can be used under different climatic conditions, withstand storage and allow easy handling, the main prerequisites of dental biomaterials, is important. The potential for using biologically engineered tissue and consequent research to replace damaged tissues has also seen a quantum leap in the last decade. Ongoing research in regenerative treatments in dentistry includes alveolar ridge augmentation, bone tissue engineering and periodontal ligament replacement, and a future aim is bioengineering of the whole tooth. Research towards developing bioengineered teeth is well underway and identification of adult stem cell sources to make this a viable treatment is advancing; however, this

Laser restorative dentistry in children and adolescents.

Science.gov (United States)

Olivi, G; Genovese, M D

2011-04-01

The idea of substituting a drill with a laser light, has led to its introduction in dentistry. Besides being more accepted to patients, in paediatric dentistry the laser has demonstrated safety compared with rotating instruments. A review of the past 20 years of the dental literature concerning laser use in dentistry, including paediatric dentistry was completed. The findings of that review are presented. The various types of lasers and their uses for caries detection, tooth sealing and caries removal are described. Laser caries detection demonstrated a good reproducibility, reliability and predictability to monitor the caries process over time. Erbium lasers have been found to be efficient for caries removal, tooth cleaning and decontamination. The laser erbium technology represents a safe device to effectively and selectively remove carious tissues from decayed teeth. For children, all the recognized advantages of this technique play a decisive role in the successful day-to-day treatment of dental caries.

21 CFR 872.6880 - Preformed impression tray.

Science.gov (United States)

2010-04-01

...) MEDICAL DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6880 Preformed impression tray. (a) Identification. A preformed impression tray is a metal or plastic device intended to hold impression material... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Preformed impression tray. 872.6880 Section 872...

Interpreter-mediated dentistry.

Science.gov (United States)

Bridges, Susan; Drew, Paul; Zayts, Olga; McGrath, Colman; Yiu, Cynthia K Y; Wong, H M; Au, T K F

2015-05-01

The global movements of healthcare professionals and patient populations have increased the complexities of medical interactions at the point of service. This study examines interpreter mediated talk in cross-cultural general dentistry in Hong Kong where assisting para-professionals, in this case bilingual or multilingual Dental Surgery Assistants (DSAs), perform the dual capabilities of clinical assistant and interpreter. An initial language use survey was conducted with Polyclinic DSAs (n = 41) using a logbook approach to provide self-report data on language use in clinics. Frequencies of mean scores using a 10-point visual analogue scale (VAS) indicated that the majority of DSAs spoke mainly Cantonese in clinics and interpreted for postgraduates and professors. Conversation Analysis (CA) examined recipient design across a corpus (n = 23) of video-recorded review consultations between non-Cantonese speaking expatriate dentists and their Cantonese L1 patients. Three patterns of mediated interpreting indicated were: dentist designated expansions; dentist initiated interpretations; and assistant initiated interpretations to both the dentist and patient. The third, rather than being perceived as negative, was found to be framed either in response to patient difficulties or within the specific task routines of general dentistry. The findings illustrate trends in dentistry towards personalized care and patient empowerment as a reaction to product delivery approaches to patient management. Implications are indicated for both treatment adherence and the education of dental professionals. Copyright © 2015 Elsevier Ltd. All rights reserved.

How good are our impressions? An audit of alginate impression quality in the production of removable prostheses.

Science.gov (United States)

Horwitz, Richard

2014-05-01

Impressions are taken regularly in practice giving vital information to the dental laboratory, but are there quality assurance systems in place to make sure that they are up to a sufficient standard? As dental professionals we have to appreciate that dental technicians can only work with the information given to them. This makes the skill of taking a good impression vital in order for us as clinicians to provide prostheses of good quality. This paper outlines an audit of alginate impressions and their quality in the making of removable prostheses. To record the quality of impression taking, and how one's own ability to critique an impression may differ from that of our colleagues.

Advances in Nanotechnology for Restorative Dentistry

Science.gov (United States)

Khurshid, Zohaib; Zafar, Muhammad; Qasim, Saad; Shahab, Sana; Naseem, Mustafa; AbuReqaiba, Ammar

2015-01-01

Rationalizing has become a new trend in the world of science and technology. Nanotechnology has ascended to become one of the most favorable technologies, and one which will change the application of materials in different fields. The quality of dental biomaterials has been improved by the emergence of nanotechnology. This technology manufactures materials with much better properties or by improving the properties of existing materials. The science of nanotechnology has become the most popular area of research, currently covering a broad range of applications in dentistry. This review describes the basic concept of nanomaterials, recent innovations in nanomaterials and their applications in restorative dentistry. Advances in nanotechnologies are paving the future of dentistry, and there are a plenty of hopes placed on nanomaterials in terms of improving the health care of dental patients. PMID:28787967

Sulcus depth reproduction with polyvinyl siloxane impression material: effects of hydrophilicity and impression temperature.

Science.gov (United States)

Takahashi, Hidekazu; Finger, Werner J; Kurokawa, Rie; Furukawa, Masae; Komatsu, Masashi

2010-03-01

To determine the sulcus penetration ability of hydrophilic and hydrophobic polyvinyl siloxane (PVS) impression materials by impression technique, temperature, and sulcus width. Hydrophilic Flexitime (FLE; Heraeus Kulzer) and its hydrophobic counterpart (EXP) without surfactant were investigated, using light (L), monophase (M), and heavy (H) consistencies. A truncated steel cone surrounded by a 2-mm-deep and 50-, 100-, or 200-microm-wide sulcus, simulating the gingival tissue with agar, served as the test model. Impressions were made with single-mix (L or M) and double-mix (LM or LH) techniques at 23 degrees C and 37 degrees C, respectively. The reproduced sulcus heights were measured with a 3D laser scanner. Data were analyzed by ANOVA and Tukey HSD (P 1.9 mm); FLE-M, -LM, and-LH reproductions were shorter with narrow sulci. Reproductions of 50- and 100-microm sulci with EXP-L were shallower than with FLE-L. The shortest reproduction was, however, greater than 1.6 mm. In spite of some significant differences found in sulcus-reproducing ability with hydrophilic and hydrophobic impression materials applied at different impression-making temperatures and with different techniques, the practical relevance is limited.

Possibility of magnetic resonance imaging application in teaching preclinical dentistry - endodontic and prosthetic treatment prognosis

International Nuclear Information System (INIS)

Tanasiewicz, T.

2010-01-01

Background. The necessary condition for successful both endodontic and prosthetic reconstruction treatment is the precise mapping of the shape of dental cavities. The aim of this work is an elaboration and verification of the possibility of using 3D Spin Echo MRI techniques in teaching preclinical dentistry both in endodontic and prosthetics specialty. Objectives. Author' aim was to obtain an elaboration and a verification, whether there exists a possibility to use, at the level of in vitro analysis, techniques of the Magnetic Resonance Imaging, which are based on the 3D sequence of the Spin Echo that may in the future find employment in the teaching of preclinical dentistry, clinical dental therapy and diagnostics within the scope of: a dimensional imaging of the inner topography of teeth and spatial structure of a chamber and root canals of teeth for the therapeutic and didactic aims; introduction of a nondestructive and a non-impressional method of reconstruction of the topography of the inner spaces of the human teeth for the purposes of the reconstructive dentistry. Material and Methods. 6 extracted molar teeth were used for measurements without additional preparation, after endodontic and prosthetic preparation. MR measurements were carried out on a 4.7 T research MRI system equipped with Maran DRX console. Results. Figures show 3D images of outer surface, inner space of the teeth before and after endodontic preparation and internal tooth fixation constructed using both classical methods (polymer mass impression) and non-impressional methods (MRI representation). The sizes of the presented volumes were calculated. Internal tooth volumes were determined before and after endodontic treatment; total tooth volumes were also measured. Research proceedings made it possible to compare the quality of internal tooth space after preparation for inner root canals fixations constructed using both classical methods and non-impressional MRI method. Conclusions. The results

Nanotechnology in dentistry: prevention, diagnosis, and therapy

Directory of Open Access Journals (Sweden)

Abou Neel EA

2015-10-01

Full Text Available Ensanya Ali Abou Neel,1–3 Laurent Bozec,3 Roman A Perez,4,5 Hae-Won Kim,4–6 Jonathan C Knowles3,5 1Division of Biomaterials, Operative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia; 2Biomaterials Department, Faculty of Dentistry, Tanta University, Tanta, Egypt; 3UCL Eastman Dental Institute, Biomaterials and Tissue Engineering, London, UK; 4Institute of Tissue Regenerative Engineering (ITREN, 5Department of Nanobiomedical Science and BK21 Plus NBM Global Research Center for Regenerative Medicine, 6Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, Republic of Korea Abstract: Nanotechnology has rapidly expanded into all areas of science; it offers significant alternative ways to solve scientific and medical questions and problems. In dentistry, nanotechnology has been exploited in the development of restorative materials with some significant success. This review discusses nanointerfaces that could compromise the longevity of dental restorations, and how nanotechnolgy has been employed to modify them for providing long-term successful restorations. It also focuses on some challenging areas in dentistry, eg, oral biofilm and cancers, and how nanotechnology overcomes these challenges. The recent advances in nanodentistry and innovations in oral health-related diagnostic, preventive, and therapeutic methods required to maintain and obtain perfect oral health, have been discussed. The recent advances in nanotechnology could hold promise in bringing a paradigm shift in dental field. Although there are numerous complex therapies being developed to treat many diseases, their clinical use requires careful consideration of the expense of synthesis and implementation. Keywords: nanotechnology, nanointerfaces, biofilm-related oral diseases, tissue engineering, drug delivery, toxicity

21 CFR 872.3660 - Impression material.

Science.gov (United States)

2010-04-01

...) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3660 Impression material. (a) Identification. Impression material is a device composed of materials such as alginate or polysulfide intended to be placed... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Impression material. 872.3660 Section 872.3660...

21 CFR 872.6570 - Impression tube.

Science.gov (United States)

2010-04-01

... DEVICES DENTAL DEVICES Miscellaneous Devices § 872.6570 Impression tube. (a) Identification. An impression tube is a device consisting of a hollow copper tube intended to take an impression of a single tooth...) Classification. Class I (general controls). The device is exempt from the premarket notification procedures in...

Two-piece impression procedure for implant-retained orbital prostheses.

Science.gov (United States)

Ozcelik, Tuncer Burak; Yilmaz, Burak

2012-01-01

Obtaining an accurate impression of facial tissues with undercuts and extraoral implants has always been a challenge for both clinicians and patients. This report describes a three-step, two-piece technique that enables an accurate and comfortable impression of undercut tissues and extraoral implants in an orbital defect. An impression of the basal tissue surface of the defect area was made using a medium-body polyether impression material followed by an impression of the entire face of the patient made with a polyvinyl siloxane (PVS) impression material. First, the PVS impression material was removed; second, the impression posts were removed from the magnets; and third, the polyether impression was removed from the defect. The impression posts were attached to the implant analogs and placed in the negative spaces in the polyether impression. The polyether impression, which carries the implant analogs and impression posts, was placed in the PVS impression through the negative spaces. This technique minimizes trauma to the soft tissues and implants during impression making and also does not require additional materials.

Digital Versus Conventional Impressions in Fixed Prosthodontics: A Review.

Science.gov (United States)

Ahlholm, Pekka; Sipilä, Kirsi; Vallittu, Pekka; Jakonen, Minna; Kotiranta, Ulla

2018-01-01

To conduct a systematic review to evaluate the evidence of possible benefits and accuracy of digital impression techniques vs. conventional impression techniques. Reports of digital impression techniques versus conventional impression techniques were systematically searched for in the following databases: Cochrane Central Register of Controlled Trials, PubMed, and Web of Science. A combination of controlled vocabulary, free-text words, and well-defined inclusion and exclusion criteria guided the search. Digital impression accuracy is at the same level as conventional impression methods in fabrication of crowns and short fixed dental prostheses (FDPs). For fabrication of implant-supported crowns and FDPs, digital impression accuracy is clinically acceptable. In full-arch impressions, conventional impression methods resulted in better accuracy compared to digital impressions. Digital impression techniques are a clinically acceptable alternative to conventional impression methods in fabrication of crowns and short FDPs. For fabrication of implant-supported crowns and FDPs, digital impression systems also result in clinically acceptable fit. Digital impression techniques are faster and can shorten the operation time. Based on this study, the conventional impression technique is still recommended for full-arch impressions. © 2016 by the American College of Prosthodontists.

The Intraoral Ultrasonography in Dentistry | Caglayan | Nigerian ...

African Journals Online (AJOL)

Intraoral USG is also used in dentistry for examining the salivary glands and ducts, as well as the mouth floor, the buccal, labial, and palatal mucosa, the tongue, periodontal tissues, and periapical lesions. The main purpose of this review is to provide detailed information about intraoral USG applications in dentistry.

A comparative evaluation of intraoral and extraoral digital impressions: An in vivo study.

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Sason, Gursharan Kaur; Mistry, Gaurang; Tabassum, Rubina; Shetty, Omkar

2018-01-01

The accuracy of a dental impression is determined by two factors: "trueness" and "precision." The scanners used in dentistry are relatively new in market, and very few studies have compared the "precision" and "trueness" of intraoral scanner with the extraoral scanner. The aim of this study was to evaluate and compare accuracy of intraoral and extraoral digital impressions. Ten dentulous participants (male/female) aged 18-45 years with an asymptomatic endodontically treated mandibular first molars with adjacent teeth present were selected for this study. The prepared test tooth was measured using a digital Vernier caliper to obtain reference datasets. The tooth was then scanned using the intraoral scanner, and the extraoral scans were obtained using the casts made from the impressions. The datasets were divided into four groups and then statistically analyzed. The test tooth preparation was done, and dimples were made using a round diamond point on the bucco-occlusal, mesio-occlusal, disto-occlusal, and linguo-occlusal lines angles, and these were used to obtain reference datasets intraorally using a digital Vernier caliper. The test tooth was then scanned with the IO scanner (CS 3500, Carestream dental) thrice and also impressions were made using addition silicone impression material (3M™ ESPE) and dental casts were poured in Type IV dental stone (Kalrock-Kalabhai Karson India Pvt. Ltd., India) which were later scanned with the EO scanner (LAVA™ Scan ST Design system [3M™ ESPE]) thrice. The Datasets obtained from Intraoral and Extraoral scanner were exported to Dental Wings software and readings were obtained. Repeated measures ANOVA test was used to compare differences between the groups and independent t -test for comparison between the readings of intraoral and extraoral scanner. Least significant difference test was used for comparison between reference datasets with intraoral and extraoral scanner, respectively. A level of statistical significance of P

Options in virtual 3D, optical-impression-based planning of dental implants.

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Reich, Sven; Kern, Thomas; Ritter, Lutz

2014-01-01

If a 3D radiograph, which in today's dentistry often consists of a CBCT dataset, is available for computerized implant planning, the 3D planning should also consider functional prosthetic aspects. In a conventional workflow, the CBCT is done with a specially produced radiopaque prosthetic setup that makes the desired prosthetic situation visible during virtual implant planning. If an exclusively digital workflow is chosen, intraoral digital impressions are taken. On these digital models, the desired prosthetic suprastructures are designed. The entire datasets are virtually superimposed by a "registration" process on the corresponding structures (teeth) in the CBCTs. Thus, both the osseous and prosthetic structures are visible in one single 3D application and make it possible to consider surgical and prosthetic aspects. After having determined the implant positions on the computer screen, a drilling template is designed digitally. According to this design (CAD), a template is printed or milled in CAM process. This template is the first physically extant product in the entire workflow. The article discusses the options and limitations of this workflow.

Disinfection of dental impressions - compliance to accepted standards.

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Almortadi, N; Chadwick, R G

2010-12-18

The responsibility of ensuring impressions have been cleaned and disinfected before dispatch to the dental laboratory lies solely with the dentist. Uncertainty of impression disinfection risks both the health of the receiving dental technician and potential repeat disinfection of an already disinfected impression with detrimental consequences for its dimensions. To ascertain, from the perspectives of dentists and dental technicians, current impression decontamination and disinfection practices with, in the case of the technicians, an estimate of the relative prevalence of contaminated voids within apparently disinfected impressions. Anonymous postal questionnaire. Dentist (n = 200) and dental technician (n = 200) potential participants, selected at random from the registers held by the General Dental Council, were invited to complete an anonymous postal questionnaire that sought to establish current practices and perceived effectiveness of impression disinfection. Questionnaire return rates of 42.1% and 31.2% were recorded for dentists and dental technicians respectively. A wide range of solutions, at different dilutions of the same product, was used by the dentists to disinfect dental impressions. 37.2% rinsed the impressions with water, and 2.6% always brushed debris away, before disinfection. 24.7% of dentists did not inform the laboratory of disinfection. Irrespective of the disinfection status of the received impressions, 50% of the responding dental technicians disinfected all impressions. 95% of them had received blood-contaminated impressions. 15% had encountered blood-filled voids upon trimming back the peripheries of impressions. 64.7% were confident that the impressions received by them had been disinfected by the dentists. Compliance with good practice is less than ideal and education in impression disinfection for both dentists and dental technicians is required to address this.

Evidence-Based Dentistry in Everyday Practice.

Science.gov (United States)

Gudray, Kiran; Walmsley, Anthony Damien

2016-12-01

This article informs readers of a method of implementing evidence-based dentistry in practice. Following these steps, practitioners should be able to use this skill in an efficient manner. The importance of evidence-based dentistry and its relevance to situations encountered in everyday practice is also highlighted. Clinical relevance: This article highlights a series of steps to be followed by practitioners to ensure that treatment provided is supported by the most recent, good quality evidence.

Augmented reality in dentistry: a current perspective.

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Kwon, Ho-Beom; Park, Young-Seok; Han, Jung-Suk

2018-02-21

Augmentation reality technology offers virtual information in addition to that of the real environment and thus opens new possibilities in various fields. The medical applications of augmentation reality are generally concentrated on surgery types, including neurosurgery, laparoscopic surgery and plastic surgery. Augmentation reality technology is also widely used in medical education and training. In dentistry, oral and maxillofacial surgery is the primary area of use, where dental implant placement and orthognathic surgery are the most frequent applications. Recent technological advancements are enabling new applications of restorative dentistry, orthodontics and endodontics. This review briefly summarizes the history, definitions, features, and components of augmented reality technology and discusses its applications and future perspectives in dentistry.

Plasma rich in growth factors in dentistry

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Ana Glavina

2017-06-01

Full Text Available Background Plasma rich in growth factors (PRGF has wider use in many fields of dentistry due to its endogenous biocompatible regenerative potential i.e., their potential to stimulate and accelerate tissue healing and bone regeneration. Aims This review shows the increasing use of PRGF technology in various fields of dentistry. Methods In the last nine years PubMed has been searched in order to find out published articles upon PRGF in dentistry and 36 papers have been included. Results PRGF technology has many advantages with positive clinical and biological outcomes in tissue healing and bone regeneration. Conclusion In order to determine the most effective therapeutic value for patients, further research is required.

Pediatric Dentistry: A Clinical Approach, 3rd Edition

DEFF Research Database (Denmark)

Pediatric Dentistry: A Clinical Approach, Third Edition provides a uniquely clear, comprehensive, and clinical approach to the dental treatment of children and adolescents. •Offers systematic coverage of all clinical, scientific and social topics relating to pediatric dentistry •Thoroughly revised...

Impression management as symbolic capital

DEFF Research Database (Denmark)

Lueg, Klarissa; Nielsen, Camilla

2015-01-01

in Germany and LinkedIn in Denmark. We summarize those differences and relate them to different cultural contexts and impression management practices. Our sample consists of Danish Higher Executives (HEs)/managers (e.g., CEOs) and companies that have profiles on both SNS, thus reaching out to both the German......Social Network Sites (SNS) play an increasingly important role in the European business world, especially with respect to cross-cultural impression management. Departing from the Bourdieusian concept of “capital,” this paper analyzes the differences in the use of two popular business SNS: XING...... and the Danish markets. It is apparent that even business experts operating in both markets could better adapt to the standards and possibilities offered by the German SNS with respect to impression management. We introduce a set of recommendations to foster SNS-related and culture-sensitive impression...

A systematic review of the uses of fluoroscopy in dentistry.

Science.gov (United States)

Uzbelger Feldman, Daniel; Yang, Jie; Susin, Cristiano

2010-01-01

To determine the quality of the evidence for the uses of fluoroscopy in dentistry. A systematic review using Ovid and MEDLINE was conducted to identify papers showing the uses of fluoroscopy in dentistry published between 1953 and September 2009. Human, animal and phantom/skull/mannequin studies on fluoroscopy with regard to its diagnostic value, research performance, and clinical and safety applications in dentistry were included in this analysis. Studies that were not in English, as well as those that employed fluoroscopy in dentistry without the use of image intensification, were excluded. Articles were evaluated, classified and graded by levels of evidence. Fifty-five out of 139 papers fulfilled the inclusion criteria. Amongst them, 19 were related to diagnosis, 15 to research, 12 to clinical and nine to safety applications. Fluoroscopy has contributed to nine different areas of dentistry. Also, it was used on 895 dental patients, 37 animals and 17 phantoms/skulls/mannequins. Two randomised controlled trials, two cohort studies, two case controls, 48 case reports and one expert opinion were found. Fluoroscopy with image intensification has been a useful, but not consistently used tool in dentistry for over 50 years. Several lines of evidence have shown fluoroscopy's diagnostic potential, research use, and clinical and safety applications in dentistry.

The Image Gently in Dentistry campaign: promotion of responsible use of maxillofacial radiology in dentistry for children

OpenAIRE

White, SC; Scarfe, WC; Schulze, RKW; Lurie, AG; Douglass, JM; Farman, AG; Law, CS; Levin, MD; Sauer, RA; Valachovic, RW; Zeller, GG; Goske, MJ

2014-01-01

© 2014 Published by Elsevier Inc. The Image Gently in Dentistry campaign to be launched in September 2014 is a specific initiative of the Alliance for Radiation Safety in Pediatric Imaging, supported by organized dentistry and dental education as well as many dental specialty organizations. The objective of the campaign is to change practice by increasing awareness of the opportunities to improve radiation protection when imaging children in dental practices. Six practical steps are provided ...

Physical characteristic of brown algae (Phaeophyta from madura strait as irreversible hydrocolloid impression material

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Prihartini Widiyanti

2012-09-01

Full Text Available Background: Brown algae is a raw material for producing natrium alginates. One type of brown algae is Sargassum sp, a member of Phaeophyta division. Sargassum sp could be found in Madura strait Indonesia. Natrium alginate can be extracted from Sargassum sp. The demand of alginate in Indonesia is mainly fulfilled from abroad, meanwhile Sargassum sp is abundantly available. Purpose: The purpose of study were to explore the potency of brown alga Sargassum sp from Madura strait as hydrocolloid impression material and to examine its physical characteristic. Methods: The methods of research including extraction natrium alginate from Sargassum sp, synthesis of dental impression material and the test of porosity, density, viscosity, and water content of impression material which fulfilled the standard of material used in clinical application in dentistry. Results: Extraction result of Sargassum sp was natrium alginate powder with cream colour, odorless, and water soluble. The water content of natrium alginate was 21.64% and the viscosity was 0.7 cPs. The best porosity result in the sample with the addition of trinatrium phosphate 4% was 3.61%. Density value of impression material was 3 gr/cm3. Conclusion: The research suggested that brown algae Sargassum sp from Madura strait is potential as hydrocolloid impression material, due to its physical properties which close to dental impression material, but still need further research to optimize the physical characteristic.Latar belakang: Alga coklat adalah sumber bahan baku material natrium alginat. Salah satu jenis alga coklat adalah Sargassum sp yang merupakan anggota divisi Phaeophyta. Sargassum sp dapat ditemukan di Selat Madura Indonesia. Natrium alginat dapat diekstraksi dari Sargassum sp. Kebutuhan akan bahan ini di Indonesia sebagian besar dipenuhi dari impor, padahal ketersediaan Sargassum sp di Indonesia sangat melimpah. Tujuan: Penelitian ini bertujuan untuk mengeksplorasi potensi alga coklat

Sports dentistry: a perspective for the future

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Paulo Vinícius Soares

2014-04-01

Full Text Available Sports Dentistry (SD acts in the prevention, maintenance and treatment of oral and facial injuries, as well as the collection and dissemination of information on dental trauma, beyond stimulus to research. Establishes as a duty for the dentist detect problems related to the athlete’s stomatognathic system. This essay is based on the provided data from the literature related to SD, including definition, practice areas and research fields. To discuss the data, six areas were categorized: shares in sports dentistry; oral health of athlete; sports-related dental implications; dental-facial trauma; face shields; and mouthguards. The analyzed data show that the SD is still an underexplored field of action by dentists, but it is expanding, despite not being recognized specialty by the Federal Council of Dentistry, but the Brazilian Academy of Sports Dentistry has been created with a mission to show the real importance of Dentistry in sport. The dentist should be part of the group of professionals associated with the athlete to perform periodic checks in order to ensure oral health which may contribute to athletes´performance. When impact occurs, however, it would be possible reduce the severity of the impact related to injuries, by using helmets, masks, goggles, face shields and mouthguard. Additionally, it is imperative that dentists, sports coaching, athletes, and professional who work with athletes be aware of the benefits of incorporating SD as an important academic and professional subject.

Impression Management and Entrepreneurial Experience

DEFF Research Database (Denmark)

Halbinger, Maria; Reichstein, Toke

2016-01-01

into entrepreneurship. Analyzing individual-level data collected through online survey, field studies and experiments in hacker-and makerspaces, we find that impression management behavior that focuses others, i.e. accommodative impression management is positively associated with entrepreneurial experience while self...

Evaluation of accuracy of complete-arch multiple-unit abutment-level dental implant impressions using different impression and splinting materials.

Science.gov (United States)

Buzayan, Muaiyed; Baig, Mirza Rustum; Yunus, Norsiah

2013-01-01

This in vitro study evaluated the accuracy of multiple-unit dental implant casts obtained from splinted or nonsplinted direct impression techniques using various splinting materials by comparing the casts to the reference models. The effect of two different impression materials on the accuracy of the implant casts was also evaluated for abutment-level impressions. A reference model with six internal-connection implant replicas placed in the completely edentulous mandibular arch and connected to multi-base abutments was fabricated from heat-curing acrylic resin. Forty impressions of the reference model were made, 20 each with polyether (PE) and polyvinylsiloxane (PVS) impression materials using the open tray technique. The PE and PVS groups were further subdivided into four subgroups of five each on the bases of splinting type: no splinting, bite registration PE, bite registration addition silicone, or autopolymerizing acrylic resin. The positional accuracy of the implant replica heads was measured on the poured casts using a coordinate measuring machine to assess linear differences in interimplant distances in all three axes. The collected data (linear and three-dimensional [3D] displacement values) were compared with the measurements calculated on the reference resin model and analyzed with nonparametric tests (Kruskal-Wallis and Mann-Whitney). No significant differences were found between the various splinting groups for both PE and PVS impression materials in terms of linear and 3D distortions. However, small but significant differences were found between the two impression materials (PVS, 91 μm; PE, 103 μm) in terms of 3D discrepancies, irrespective of the splinting technique employed. Casts obtained from both impression materials exhibited differences from the reference model. The impression material influenced impression inaccuracy more than the splinting material for multiple-unit abutment-level impressions.

Exploring leadership in the context of dentistry in the UK.

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Willcocks, Stephen George

2016-05-03

Purpose The purpose of this paper is to explore selective leadership approaches in the context of dentistry in the UK. Design/methodology/approach This is a conceptual paper utilising published sources from relevant literature about leadership theory and practice and the policy background to dentistry in the UK. Findings This paper suggests that there is merit in identifying and applying an eclectic mix of leadership theory to the case of dentistry. It offers insight into individual aspects of the leadership role for dentists and applies this to the dental context. It also contrasts these individual approaches with shared leadership and suggests this may also be relevant to dentistry. It highlights the fact that leadership will be of growing concern for dentistry in the light of recent policy changes. Research limitations/implications This paper points out that there are developmental implications depending on the particular approach taken. It argues that leadership development will become increasingly important in dentistry in the UK. Originality/value This paper addresses a topic that has so far received limited attention in the literature.

Demand in Pediatric Dentistry for Sedation and General Anesthesia by Dentist Anesthesiologists: A Survey of Directors of Dentist Anesthesiologist and Pediatric Dentistry Residencies

OpenAIRE

Hicks, C. Gray; Jones, James E.; Saxen, Mark A.; Maupome, Gerardo; Sanders, Brian J.; Walker, LaQuia A.; Weddell, James A.; Tomlin, Angela

2012-01-01

This study describes what training programs in pediatric dentistry and dental anesthesiology are doing to meet future needs for deep sedation/general anesthesia services required for pediatric dentistry. Residency directors from 10 dental anesthesiology training programs in North America and 79 directors from pediatric dentistry training programs in North America were asked to answer an 18-item and 22-item online survey, respectively, through an online survey tool. The response rate for the 1...

Paediatric laser dentistry. Part 1: General introduction.

Science.gov (United States)

Caprioglio, C; Olivi, G; Genovese, M D

2017-03-01

Knowledge of the physical characteristics of different laser lights and optical and thermal properties of oral tissues is very important to understand the interaction of dental lasers with biological tissues. Choosing the correct dental laser is crucial to match specific wavelengths with target chromophores of different tissues; this affinity makes laser irradiation selective and therefore minimally invasive. Various types of lasers are used in dentistry, offering a viable alternative to low and high-speed handpieces and surgical blades, and also minimising fear and discomfort of the patient. Lasers can provide innovative and minimally invasive therapies in different branches of dentistry including preventive and restorative dentistry, traumatic injury treatments and surgical procedures. Laser has also biostimulating and anti-inflammatory effects, as well as analgesic effect.

Predoctoral Teaching of Geriatric Dentistry in U.S. Dental Schools.

Science.gov (United States)

Ettinger, Ronald L; Goettsche, Zachary S; Qian, Fang

2017-08-01

The aim of this study was to assess the current teaching of geriatric dentistry in U.S. dental schools and compare the findings to previous reports. Academic deans at all 67 U.S. dental schools were contacted in November 2015 via email, asking them to complete a questionnaire about the teaching of geriatric dentistry or gerodontology at their institution. Questionnaires were received from 56 of the 67 schools (84% response rate). The results showed that geriatric dentistry was taught in all responding schools; for 92.8% of the respondents, the instruction was compulsory. Among the responding schools, 62.5% were teaching it as an independent course, 25% as an organized series of lectures, and 8.9% as occasional lectures in parts of other courses. In addition, 57.1% had some form of compulsory clinical education in geriatric dentistry. Public schools, as opposed to private schools, were marginally associated with an increased interest in expanding geriatric dentistry teaching (p=0.078). No differences were found between any teaching variables and school location. This study found that the form of education in geriatric dentistry in U.S. dental schools differed in many ways, but the teaching of geriatric dentistry had increased among all respondents and had been increasing for over 30 years. Future research is needed to determine the impact of this teaching on services to the geriatric community.

Tissue engineering in dentistry.

Science.gov (United States)

Abou Neel, Ensanya Ali; Chrzanowski, Wojciech; Salih, Vehid M; Kim, Hae-Won; Knowles, Jonathan C

2014-08-01

of this review is to inform practitioners with the most updated information on tissue engineering and its potential applications in dentistry. The authors used "PUBMED" to find relevant literature written in English and published from the beginning of tissue engineering until today. A combination of keywords was used as the search terms e.g., "tissue engineering", "approaches", "strategies" "dentistry", "dental stem cells", "dentino-pulp complex", "guided tissue regeneration", "whole tooth", "TMJ", "condyle", "salivary glands", and "oral mucosa". Abstracts and full text articles were used to identify causes of craniofacial tissue loss, different approaches for craniofacial reconstructions, how the tissue engineering emerges, different strategies of tissue engineering, biomaterials employed for this purpose, the major attempts to engineer different dental structures, finally challenges and future of tissue engineering in dentistry. Only those articles that dealt with the tissue engineering in dentistry were selected. There have been a recent surge in guided tissue engineering methods to manage periodontal diseases beyond the traditional approaches. However, the predictable reconstruction of the innate organisation and function of whole teeth as well as their periodontal structures remains challenging. Despite some limited progress and minor successes, there remain distinct and important challenges in the development of reproducible and clinically safe approaches for oral tissue repair and regeneration. Clearly, there is a convincing body of evidence which confirms the need for this type of treatment, and public health data worldwide indicates a more than adequate patient resource. The future of these therapies involving more biological approaches and the use of dental tissue stem cells is promising and advancing. Also there may be a significant interest of their application and wider potential to treat disorders beyond the craniofacial region. Considering the

Impressed by impression management: Newcomer reactions to ingratiated supervisors.

Science.gov (United States)

Foulk, Trevor A; Long, David M

2016-10-01

Organizational newcomers are unfamiliar with many aspects of their workplace and look for information to help them reduce uncertainty and better understand their new environment. One aspect critical to newcomers is the disposition of their supervisor-the person who arguably can impact the newcomer's career the most. To form an impression of their new supervisor, newcomers look to social cues from coworkers who have interpersonal contact with the supervisor. In the present research, we investigate the ways newcomers use observed ingratiation-a common impression management strategy whereby coworkers try to appear likable (Schlenker, 1980)-to form impressions of a supervisor's warmth. Research on social influence cannot easily account for how third parties will interpret ingratiation, as the behaviors linked to ingratiation suggest something positive about the target, yet the unsavory aspects of the behavior imply it may not have the same effects as other positive behaviors. Our findings suggest that newcomers are unique in that they are motivated to learn about their new supervisor, and are prone to ignore those unsavory aspects and infer something positive about a supervisor targeted with ingratiation. Our findings also suggest that this effect can be weakened based on the supervisor's response. In other words, newcomers rely less on evidence from a coworker's ingratiation in the presence of direct behaviors from the supervisor. (PsycINFO Database Record (c) 2016 APA, all rights reserved).

Effect of Storage Time and Temperature on Dimensional Stability of Impressions Made with Zinc Oxide Impression Paste

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Sareh Habibzadeh

2016-10-01

Full Text Available Objectives: This study aimed to assess the effect of storage time and temperature on dimensional stability of impressions made with Cavex Outline zinc oxide impression paste.Materials and Methods: A round stainless steel mold with five grooves (three horizontal and two vertical was used in this in-vitro experimental study. Cavex Outline impression paste was prepared according to the manufacturer’s instructions and applied to the mold. The mold was placed on a block and stored at 35°C and 100% humidity for setting. The impressions were poured with stone immediately and also after 30, 120, 240 and 420 minutes and 24 hours. The distance between the vertical lines on the casts was measured and compared with that in the immediately poured cast.Results: Storage in a refrigerator and at room temperature for zero to seven hours had no significant effect on dimensional stability of the impressions; however, 24 hours of storage in a refrigerator or at room temperature decreased the dimensional stability of Cavex Outline (P=0.001. Also, a significant association was found between dimensional changes following 24 hours of storage in a refrigerator (4°C and at room temperature (23°C; P<0.01.Conclusions: The optimal pouring time of Cavex Outline impressions with stone is between zero to seven hours, and 24 hours of storage significantly decreases the dimensional stability.Keywords: Dental Impression Materials; Zinc Oxide; Cavex

Preliminary impression techniques for microstomia patients

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K Aswini Kumar

2016-01-01

Full Text Available The Prosthetic rehabilitation of microstomia patients presents difficulties at all the stages. The difficulty starts with the preliminary impression making. This is due to the tongue rigidity and the decreased oral opening. A maximum oral opening which is smaller than the size of the tray can make prosthetic treatment challenging. Due to the restricted mouth opening, insertion and removal of the impression trays is extremely cumbersome and various modifications of the trays have been used in the past. Among these are the flexible trays and the sectional trays used with different modes of reassembling the segments extra orally after the impression is made. This article reviews the literature published from 1971 to 2015 concerning preliminary impression techniques used in making impressions for patients with microstomia based on various tray designs. An electronic search was performed across three databases (PubMed, Science Direct and Google Scolar for relevant citations. The keywords/combinations used for the search were microstomia, limited/constricted/restricted mouth opening/oral access, trismus, sectional trays, impressions and prosthetic/prosthodontic rehabilitation. The search was limited to papers written in English which resulted in a total of 45 related articles of which 17 articles were included for discussion of this review.

Scientific Productivity of Dentistry in Iranian Journals during 1978-2006

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Roghie Eskroochi

2010-12-01

Full Text Available   This investigation is an attempt to study growth and development of scientific products in dentistry using scientometrics in Iran during 1978-2006.   In this project, 2726 dentistry articles published in Iranian journals during a specific period; including Persian and English articles, were collected. Then subjects of all articles were specified using MESH and NLM classification systems.   In Persian dentistry journals, dentistry journal of Shahid Beheshti University of Medical Science has published 804 articles during a specific period that includes 35/07% of all articles; therefore it falls in the first rank.   Among 2726 articles collected, 2102 Persian articles and 95 English articles were written by a team and 520 Persian articles and 9 English articles by individuals.   Maximum number of articles belonged to Prosthodontics and minimum number of articles were on Oral and Maxillofacial pathology.   Scientific outputs in dentistry in Iran have undergone an ascending growth since 2000 and it reached its highest level with 360 scientific articles in 2006.   This investigation indicates the evolutionary trend and dramatic growth in number of dentistry articles published in Iranian journals.

Impression mismanagement : People as inept self-presenters

NARCIS (Netherlands)

Steinmetz, J.F.; Sezer, O.; Sedikides, C.

2017-01-01

People routinely manage the impressions they make on others, attempting to project a favorable self-image. The bulk of the literature has portrayed people as savvy self-presenters who typically succeed at conveying a desired impression. When people fail at making a favorable impression, such as when

Radioprotection in dentistry: Analysis of the Dentistry Faculties of the Rio de Janeiro State not referring at personnel and installations

International Nuclear Information System (INIS)

Padilha F, L.G.; Borges, J.C.; Raymundo Junior, R.; Koch, H.A.

1998-01-01

The objective was to show the necessity and the importance of the training and formation of the dentist in radioprotection according to the recent proposal for technical regulations 'Radiological protection directrixes in Medical and Dentistry radiodiagnostic' of the Secretaria do Vigilancia Sanitaria of Ministerio da Saude (SVSMS). This regulation establishes basic standards to radioprotection in the medical and dentistry areas, including principles, limits, obligations and basic controls for the man and environment protection, versus possible improper effects caused by the use of ionizing radiation sources. An analysis of the discipline programs of the Dentistry Schools of Rio de Janeiro state indicates that they show a little or none preoccupation by the radiological protection, which was confirmed through a survey applied toward responsible professors by department or radiology service to the dentistry Schools. This work suggests the creation or adaptation of the existing disciplines introducing radioprotection and images quality in radiodiagnostic, to improve, complement and to make uniform the formation of future dentists optimizing the solution of the identified problems. (Author)

Demand in pediatric dentistry for sedation and general anesthesia by dentist anesthesiologists: a survey of directors of dentist anesthesiologist and pediatric dentistry residencies.

Science.gov (United States)

Hicks, C Gray; Jones, James E; Saxen, Mark A; Maupome, Gerardo; Sanders, Brian J; Walker, Laquia A; Weddell, James A; Tomlin, Angela

2012-01-01

This study describes what training programs in pediatric dentistry and dental anesthesiology are doing to meet future needs for deep sedation/general anesthesia services required for pediatric dentistry. Residency directors from 10 dental anesthesiology training programs in North America and 79 directors from pediatric dentistry training programs in North America were asked to answer an 18-item and 22-item online survey, respectively, through an online survey tool. The response rate for the 10 anesthesiology training program directors was 9 of 10 or 90%. The response rate for the 79 pediatric dentistry training program directors was 46 of 79 or 58%. Thirty-seven percent of pediatric dentistry programs use clinic-based deep sedation/general anesthesia for dental treatment in addition to hospital-based deep sedation/general anesthesia. Eighty-eight percent of those programs use dentist anesthesiologists for administration of deep sedation/general anesthesia in a clinic-based setting. Pediatric dentistry residency directors perceive a future change in the need for deep sedation/general anesthesia services provided by dentist anesthesiologists to pediatric dentists: 64% anticipate an increase in need for dentist anesthesiologist services, while 36% anticipate no change. Dental anesthesiology directors compared to 2, 5, and 10 years ago have seen an increase in the requests for dentist anesthesiologist services by pediatric dentists reported by 56% of respondents (past 2 years), 63% of respondents (past 5 years), and 88% of respondents (past 10 years), respectively. Predicting the future need of dentist anesthesiologists is an uncertain task, but these results show pediatric dentistry directors and dental anesthesiology directors are considering the need, and they recognize a trend of increased need for dentist anesthesiologist services over the past decade.

Effects of Impression Coping Design, Impression Technique, and Dental Undercuts on the Accuracy of Implant Impressions Assessed by 3-Dimensional Optical Scanning: An In Vitro Study.

Science.gov (United States)

Sabouhi, Mahmoud; Bajoghli, Farshad; Dakhilalian, Mansour; Beygi, Ali; Abolhasani, Majid

2016-04-01

The aim of this in vitro study was to evaluate the effect of the type and design of the impression copings on the accuracy of implant impressions in 2 different conditions. A reference model with 2 implants inserted in bilateral mandibular canines was fabricated. The posterior teeth were inserted as tilted to simulate intra-oral undercuts. The teeth were eliminated to create an edentulous condition. Three different impression techniques were performed (open high retentive [OH], open low retentive [OL], closed [C]) for each condition. Total of 48 casts were made. Two scan-bodies were secured on each cast, scanned by an optical scanner. Then, they were compared to the scan of the reference model, and the calculated mean errors were analyzed with a 2-way ANOVA and Tukey test. There was no significant difference between the complete and partially edentulous groups (F = 3.252, P = 0.079). There was significant difference between the different designs of the impression copings (F = 31.789, P impression copings was more important than the undercuts. The accuracy of the closed tray coping was greater than the low retentive coping and equal to the high retentive coping.

Recent advances in imaging technologies in dentistry

Institute of Scientific and Technical Information of China (English)

Naseem; Shah; Nikhil; Bansal; Ajay; Logani

2014-01-01

Dentistry has witnessed tremendous advances in all its branches over the past three decades. With these advances, the need for more precise diagnostic tools,specially imaging methods, have become mandatory.From the simple intra-oral periapical X-rays, advanced imaging techniques like computed tomography, cone beam computed tomography, magnetic resonance imaging and ultrasound have also found place in modern dentistry. Changing from analogue to digital radiography has not only made the process simpler and faster but also made image storage, manipulation(brightness/contrast, image cropping, etc.) and retrieval easier. The three-dimensional imaging has made the complex cranio-facial structures more accessible for examination and early and accurate diagnosis of deep seated lesions. This paper is to review current advances in imaging technology and their uses in different disciplines of dentistry.

Interprofessional Collaborative Practice: How Could Dentistry Participate?

Science.gov (United States)

Cole, James R; Dodge, William W; Findley, John S; Horn, Bruce D; Kalkwarf, Kenneth L; Martin, Max M; Valachovic, Richard W; Winder, Ronald L; Young, Stephen K

2018-05-01

There is a remarkable phenomenon occurring among health professionals: the development of ongoing, routine collaboration, both in educating the next generation of providers and in delivering care. These new approaches, commonly referred to as interprofessional education and interprofessional collaborative practice, have been introduced into academic health settings and delivery systems throughout the U.S. and the rest of the world; however, the full integration of dentistry in health care teams remains unrealized. In academic settings, dentistry has found ways to collaborate with the other health professions, but most practicing dentists still find themselves on the margins of new models of care delivery. This article provides a perspective on the history and context of the evolution of collaborative approaches to health care and proposes ways in which dentistry can participate more fully in the future.

Current applications of nanotechnology in dentistry: a review.

Science.gov (United States)

Bhavikatti, Shaeesta Khaleelahmed; Bhardwaj, Smiti; Prabhuji, M L V

2014-01-01

With the increasing demand for advances in diagnosis and treatment modalities, nanotechnology is being considered as a groundbreaking and viable research subject. This technology, which deals with matter in nanodimensions, has widened our views of poorly understood health issues and provided novel means of diagnosis and treatment. Researchers in the field of dentistry have explored the potential of nanoparticles in existing therapeutic modalities with moderate success. The key implementations in the field of dentistry include local drug delivery agents, restorative materials, bone graft materials, and implant surface modifications. This review provides detailed insights about current developments in the field of dentistry, and discusses potential future uses of nanotechnology.

Use of antidepressants in dentistry: A systematic review.

Science.gov (United States)

Lino, P A; Martins, C C; Miranda, Gfpc; de Souza E Silva, M E; de Abreu, Mhng

2017-08-24

Previous research has suggested that antidepressants can be used in oral health care. The aim of this systematic review was to search for scientific evidence of the efficacy of the use of antidepressants in dentistry. The clinical question was as follows (PICO question): dentistry patients (Patients); antidepressants (Intervention); no use or placebo or other drug (Comparison); and efficacy in oral health problems (Outcome). An electronic search was conducted in seven databases, as well as a manual search without restriction regarding language and date of publication. Two independent reviewers selected studies based on eligibility criteria, extracted data and assessed methodological quality based on the PEDro scale. The PROSPERO record is number CRD42016037442. A total of 15 randomized controlled trials were associated with the use of antidepressants to control chronic or acute pain in dentistry, among other conditions such as bruxism and burning mouth syndrome. The most commonly used drug in clinical trials was amitriptyline (more than 50% of studies). Antidepressants may be effective in dentistry for acute and chronic pain, but there is a large amount of methodological heterogeneity among the evaluated studies. In summary, there is rationality for the indication of this class of medicine in dentistry in specific clinical situations. © 2017 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. All rights reserved.

Differential reflectometry versus tactile sense detection of subgingival calculus in dentistry

Science.gov (United States)

Shakibaie, Fardad; Walsh, Laurence J.

2012-10-01

Detecting dental calculus is clinically challenging in dentistry. This study used typodonts with extracted premolar and molar teeth and simulated gingival tissue to compare the performance of differential reflectometry and periodontal probing. A total of 30 extracted teeth were set in an anatomical configuration in stone to create three typodonts. Clear polyvinyl siloxane impression material was placed to replicate the periodontal soft tissues. Pocket depths ranged from 10 to 15 mm. The three models were placed in a phantom head, and an experienced dentist assessed the presence of subgingival calculus first using the DetecTar (differential reflectometry) and then a periodontal probe. Scores from these two different methods were compared to the gold standard (direct examination of the root surface using 20× magnification) to determine the accuracy and reproducibility. Differential reflectometry was more accurate than tactile assessment (79% versus 60%), and its reproducibility was also higher (Cohen kappa 0.54 versus 0.39). Both methods performed better on single rooted premolar teeth than on multirooted teeth. These laboratory results indicate that differential reflectometry allows more accurate and reproducible detection of subgingival calculus than conventional probing, and supports its use for supplementing traditional periodontal examination methods in dental practice.

Effects of impression levels and trays on the accuracy of impressions taken from angulated implants.

Science.gov (United States)

Geramipanah, Farideh; Sahebi, Majid; Davari, Maryam; Hajimahmoudi, Mohammadreza; Rakhshan, Vahid

2015-09-01

It is crucial to keep the misfit of the abutment-fixture unit at the lowest possible rate. There are a few controversial studies on the accuracy of impression making of angulated implants, and much fewer (and controversial) studies on the abutment-level impression technique, which is a convenient and clinically favorable method. Besides, there are no studies on comparison of sectional vs. full-arch trays. We aimed to assess these. A trapezoidal model with four angulated implants installed at 20° and 30° buccal tilts was fabricated. Forty impressions were taken from this model, with two groups of full-arch and sectional custom trays (n = 2 × 20), each divided into two subgroups of implant-level and abutment-level techniques (n = 2 × 2 × 10 in four subgroups). Absolute and non-absolute linear and angular impression errors were estimated by comparing the fabricated casts with the model, using a coordinate measuring machine. The effects of sectional/full-arch trays and abutment-level and fixture-level techniques on impression accuracies were analyzed using one- and two-way analyses of variance (ANOVA), Tukey, Mann-Whitney, and one-sample t-tests (α = 0.05, Mann-Whitney's α using the Bonferroni Bonferroni method). No significant differences between the absolute linear errors of the two trays (P = 0.100 [ANOVA]) and the two levels (P = 0.400 [ANOVA]) were observed. The assessment of absolute angular errors showed no significant differences (all P values ≥ 0.4 [ANOVA]). The difference between the linear errors in the full-arch vs. sectional trays was not significant in the fixture-level group (P = 0.290). However, in the abutment-level group, the linear error was significantly greater in the sectional tray compared to full-arch tray (P = 0.013, α = 0.025 [Mann-Whitney]). Using sectional trays might not be advantageous over full-arch trays. Sectional trays are not recommended for taking abutment-level impressions. The abutment

Personalized medicine in dentistry

Directory of Open Access Journals (Sweden)

Pushpa S Pudakalkatti

2017-01-01

Full Text Available Personalized medicine is a branch of medicine that proposes customization of healthcare in which decisions and treatment are tailored according to individual patient needs. The field of personalized medicine relies on genetic information, proteomic information and clinical patient characteristics to individualize treatment. With advances in genetics, proteomics, pharmacogenetics and knowledgeable patient population, the opportunity exists to deliver never before levels of personalized care. Although general dentists may consider personalized medicine a concept for the future, the reality is that its direct application to everyday dentistry is closer than one might think. Use of personalized medicine in dentistry, especially in periodontology is progressing rapidly, and dentist should consider this approach while treating patients. Google and PubMed search was done to select articles for present review. Total 17 articles were used to compile information.

Radiation incidents in dentistry

International Nuclear Information System (INIS)

Lovelock, D.J.

1996-01-01

Most dental practitioners act as their own radiographer and radiologist, unlike their medical colleagues. Virtually all dental surgeons have a dental X-ray machine for intraoral radiography available to them and 40% of dental practices have equipment for dental panoramic tomography. Because of the low energy of X-ray equipment used in dentistry, radiation incidents tend to be less serious than those associated with other aspects of patient care. Details of 47 known incidents are given. The advent of the 1985 and 1988 Ionising Radiation Regulations has made dental surgeons more aware of the hazards of radiation. These regulations, and general health and safety legislation, have led to a few dental surgeons facing legal action. Because of the publicity associated with these court cases, it is expected that there will be a decrease in radiation incidents arising from the practice of dentistry. (author)

Demand in Pediatric Dentistry for Sedation and General Anesthesia by Dentist Anesthesiologists: A Survey of Directors of Dentist Anesthesiologist and Pediatric Dentistry Residencies

Science.gov (United States)

Hicks, C. Gray; Jones, James E.; Saxen, Mark A.; Maupome, Gerardo; Sanders, Brian J.; Walker, LaQuia A.; Weddell, James A.; Tomlin, Angela

2012-01-01

This study describes what training programs in pediatric dentistry and dental anesthesiology are doing to meet future needs for deep sedation/general anesthesia services required for pediatric dentistry. Residency directors from 10 dental anesthesiology training programs in North America and 79 directors from pediatric dentistry training programs in North America were asked to answer an 18-item and 22-item online survey, respectively, through an online survey tool. The response rate for the 10 anesthesiology training program directors was 9 of 10 or 90%. The response rate for the 79 pediatric dentistry training program directors was 46 of 79 or 58%. Thirty-seven percent of pediatric dentistry programs use clinic-based deep sedation/general anesthesia for dental treatment in addition to hospital-based deep sedation/general anesthesia. Eighty-eight percent of those programs use dentist anesthesiologists for administration of deep sedation/general anesthesia in a clinic-based setting. Pediatric dentistry residency directors perceive a future change in the need for deep sedation/general anesthesia services provided by dentist anesthesiologists to pediatric dentists: 64% anticipate an increase in need for dentist anesthesiologist services, while 36% anticipate no change. Dental anesthesiology directors compared to 2, 5, and 10 years ago have seen an increase in the requests for dentist anesthesiologist services by pediatric dentists reported by 56% of respondents (past 2 years), 63% of respondents (past 5 years), and 88% of respondents (past 10 years), respectively. Predicting the future need of dentist anesthesiologists is an uncertain task, but these results show pediatric dentistry directors and dental anesthesiology directors are considering the need, and they recognize a trend of increased need for dentist anesthesiologist services over the past decade. PMID:22428968

Top-Cited Articles in Implant Dentistry.

Science.gov (United States)

Fardi, Anastasia; Kodonas, Konstantinos; Lillis, Theodoros; Veis, Alexander

Citation analysis is the field of bibliometrics that uses citation data to evaluate the scientific recognition and the influential performance of a research article in the scientific community. The aim of this study was to conduct a bibliometric analysis of the top-cited articles pertaining to implant dentistry, to analyze the main characteristics, and to display the most interesting topics and evolutionary trends. The 100 top-cited articles published in "Dentistry, Oral Surgery, and Medicine" journals were identified using the Science Citation Index Database. The articles were further reviewed, and basic information was collected, including the number of citations, journals, authors, publication year, study design, level of evidence, and field of study. The highly cited articles in implant dentistry were cited between 199 and 2,229 times. The majority of them were published in four major journals: Clinical Oral Implants Research, International Journal of Oral & Maxillofacial Implants, Journal of Clinical Periodontology, and Journal of Periodontology. The publication year ranged from 1981 to 2009, with 45% published in a nine-year period (2001 to 2009). Publications from the United States (29%) were the most heavily cited, followed by those from Sweden (23%) and Switzerland (17%). The University of Göteborg from Sweden produced the highest number of publications (n = 19), followed by the University of Bern in Switzerland (n = 13). There was a predominance of clinical papers (n = 42), followed by reviews (n = 25), basic science research (n = 21), and proceedings papers (n = 12). Peri-implant tissue healing and health (24%), implant success/failures (19.2%), and biomechanical topics (16.8%) were the most common fields of study. Citation analysis in the field of implant dentistry reveals interesting information about the topics and trends negotiated by researchers and elucidates which characteristics are required for a paper to attain a "classic" status. Clinical

Forensic Dentistry - Identification from the Dentist's Point of View

Czech Academy of Sciences Publication Activity Database

Dostálová, T.; Eliášová, H.; Seydlová, M.; Pilin, A.; Hippmann, R.; Šimková, H.; Daniš, I.; Zvárová, Jana; Nagy, Miroslav

2008-01-01

Roč. 109, č. 1 (2008), s. 14-18 ISSN 1214-6994 R&D Projects: GA MŠk(CZ) 1M06014 Institutional research plan: CEZ:AV0Z10300504 Keywords : dentistry * forensic dentistry * identification Subject RIV: IN - Informatics, Computer Science

Evidence-based dentistry: fundamentals for the dentist.

Science.gov (United States)

Bauer, Janet; Chiappelli, Francesco; Spackman, Sue; Prolo, Paolo; Stevenson, Richard

2006-06-01

This article explains the fundamentals of evidence-based dentistry for the dentist. Evidence-based dentistry is a discipline whose primary participant is the translational researcher. Recent developments have emphasized the importance of this discipline (clinical and translational research) for improving health care. The process of evidence-based dentistry is the reciprocation of new and existing evidence between dentists and quantitative and qualitative researchers, facilitated by the translational researcher. The product of this reciprocation is the clinical practice guideline, or best evidence, that provides the patient options in choosing treatments or services. These options are quantified and qualified by decision, utility, and cost data. Using shared decision-making, the dentist and patient arrive at a mutual understanding of which option best meets an acceptable and preferred treatment course that is cost effective. This option becomes the clinical decision.

Downplaying Positive Impressions: Compensation Between Warmth and Competence in Impression Management.

Science.gov (United States)

Holoien, Deborah Son; Fiske, Susan T

2013-01-01

The compensation effect demonstrates a negative relationship between the dimensions of warmth and competence in impression formation in comparative contexts. However, does compensation between warmth and competence extend to impression management? Two studies examined whether people actively downplay their warmth in order to appear competent and downplay their competence in order to appear warm. In Studies 1a and 1b, participants selected words pretested to be high or low in warmth and competence to include in an e-mail message to people they wanted to impress. As predicted, participants downplayed their competence when they wanted to appear warm (Study 1a) and downplayed their warmth when they wanted to appear competent (Study 1b). In Studies 2a and 2b, compensation also occurred when participants introduced themselves to another person, as evidenced by the questions they selected to answer about themselves, their self-reported goals, and their open-ended introductions. Compensation occurred uniquely between warmth and competence and not for other dimensions, such as healthiness (Study 2a) and political interest (Study 2b), which suggests that the compensation effect extends beyond a mere zero-sum exchange between dimensions.

Neural correlates of self-deception and impression-management.

Science.gov (United States)

Farrow, Tom F D; Burgess, Jenny; Wilkinson, Iain D; Hunter, Michael D

2015-01-01

Self-deception and impression-management comprise two types of deceptive, but generally socially acceptable behaviours, which are common in everyday life as well as being present in a number of psychiatric disorders. We sought to establish and dissociate the 'normal' brain substrates of self-deception and impression-management. Twenty healthy participants underwent fMRI scanning at 3T whilst completing the 'Balanced Inventory of Desirable Responding' test under two conditions: 'fake good', giving the most desirable impression possible and 'fake bad' giving an undesirable impression. Impression-management scores were more malleable to manipulation via 'faking' than self-deception scores. Response times to self-deception questions and 'fake bad' instructions were significantly longer than to impression-management questions and 'fake good' instructions respectively. Self-deception and impression-management manipulation and 'faking bad' were associated with activation of medial prefrontal cortex (mPFC) and left ventrolateral prefrontal cortex (vlPFC). Impression-management manipulation was additionally associated with activation of left dorsolateral prefrontal cortex and left posterior middle temporal gyrus. 'Faking bad' was additionally associated with activation of right vlPFC, left temporo-parietal junction and right cerebellum. There were no supra-threshold activations associated with 'faking good'. Our neuroimaging data suggest that manipulating self-deception and impression-management and more specifically 'faking bad' engages a common network comprising mPFC and left vlPFC. Shorter response times and lack of dissociable neural activations suggests that 'faking good', particularly when it comes to impression-management, may be our most practiced 'default' mode. Copyright © 2014 Elsevier Ltd. All rights reserved.

Trends in complete denture impressions in pakistan

International Nuclear Information System (INIS)

Vohra, F.; Rashid, H.; Hanif, A.

2015-01-01

Multiple materials and techniques have been reported for complete denture impressions in literature. The aim of the study was to assess the trends in complete denture impression materials and techniques among general dental practitioners (GDP) and specialists (SP) in Pakistan. Methods: In this cross-sectional study, self-designed-structured questionnaires were distributed among 500 dentists in Pakistan. The three-part questionnaire enquired about the demographic features, preferred impression materials, impression techniques and related procedures commonly used in their clinical practice. A comparison between the responses of SP and GDP was also drawn. Frequency distribution and Chi-square test were performed to compare the responses. Results: A total of 294 questionnaires were completed at a response rate of 58.8%. 75% of GDP used alginate for primary impressions and 66% of SP preferred impression compound for the same. A majority of both SP and GDP favoured the used of custom trays (SP 81%, GDP 85%) and selective pressure technique (SP 84%, GDP 53%) for final impression. However, 85% of GDP used zinc-oxide eugenol and 62% of SP favoured elastomeric materials for the same. Most of the SP and GDP used chemical cured resin custom trays (SP 54%, GDP 75%), however, 86% of SP used spaced trays and almost 60% of GDP preferred close-fitting trays. Conclusions: The practice of GDP and SP with regards to CD impression materials and techniques differed significantly. Continued education and training for GDP and SP with respect to procedures and techniques related to CD is recommended. (author)

Making a Great First Impression

Science.gov (United States)

Evenson, Renee

2007-01-01

Managers and business owners often base hiring decisions on first impressions. That is why it is so important to teach students to make a great first impression--before they go on that first job interview. Managers do not have unrealistic expectations, they just want to hire people who they believe can develop into valuable employees. A nice…

Evaluation of the fit of zirconia copings fabricated by direct and indirect digital impression procedures.

Science.gov (United States)

Lee, Bora; Oh, Kyung Chul; Haam, Daewon; Lee, Joon-Hee; Moon, Hong-Seok

2018-02-07

Intraoral scanners are effective for direct digital impression when dental restorations are fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM); however, if the abutment tooth cannot be dried completely or the prepared margin is placed subgingivally, accurate digital images cannot always be guaranteed. The purpose of this in vitro study was to compare the internal and marginal discrepancies of zirconia copings fabricated directly using an intraoral scanner with those fabricated indirectly with impression scanning. Forty-five resin dies fabricated with a 3-dimensional (3D) printer were divided into 3 groups: direct scanning (DS), impression scanning (IMP), and lost-wax casting (LW). For the DS group, a resin die was scanned with an intraoral scanner (Trios; 3Shape), whereas for the IMP group, impressions made with polyether were scanned with a cast scanner (D700; 3Shape). The zirconia copings were fabricated in the same way in the DS and IMP groups. For the LW group, impressions were made in the same way as in the IMP group, and Ni-Cr alloy copings were fabricated using LW. The marginal and internal discrepancies of the copings were measured by cementing them onto resin dies, embedding them in acrylic resin, and sectioning them in a buccolingual direction. The cement layer was measured, and the Kruskal-Wallis test was used to detect significant differences (α=.05). A nonparametric Friedman test was also performed to compare the measurements of each group by location (α=.05). The mean marginal discrepancies in the DS, IMP, and LW groups were 18.1 ±9.8, 23.2 ±17.2, and 32.3 ±18.6 μm (mean ±standard deviation), respectively. The mean internal discrepancies of the DS, IMP, and LW groups in the axial area were 38.0 ±9.1, 47.0 ±16.3, and 36.5 ±15.8 μm, and those in the occlusal area were 36.7 ±16.9, 33.4 ±21.6, and 44.5 ±31.9 μm, respectively. No statistically significant differences were found in marginal or internal

The Bidimensional Impression Management Index (BIMI): measuring agentic and communal forms of impression management.

Science.gov (United States)

Blasberg, Sabrina A; Rogers, Katherine H; Paulhus, Delroy L

2014-01-01

Measures of impression management have yet to incorporate two-factor models of person perception. The 2 primary factors are often labeled agency and communion. In Study 1, we assembled a new measure of impression management—the Bidimensional Impression Management Index (BIMI): It comprises 2 subscales designed specifically to tap agentic and communal content. Both subscales showed adequate alpha reliabilities under both honest and faking conditions. In Study 2, the BIMI was cross-validated in a new sample: The subscales remained relatively independent, and their reliabilities remained solid. A coherent pattern of personality correlates also supported the validities of both subscales. In Study 3, the differential sensitivity of the 2 subscales was demonstrated by manipulating the job type in simulated job applications. Implications and applications of the BIMI are discussed.

A comparison of expectations and impressions of ethical characteristics of dentists: results of a community primary care survey.

Science.gov (United States)

Reid, Kevin; Humeniuk, Katherine M; Hellyer, Joan Henriksen; Thorsteinsdottir, Bjorg; Tilburt, Jon C

2014-08-01

To better define potential challenges in dental professional ethics, the authors gathered data regarding patients' characterizations of an ideal dentist and compared them with their impressions of dentists in general. The authors invited 500 consecutively seen primary care patients at an academic medical center to participate in the study. Participants completed a 32-item survey assessing key domains of ethical characteristics of health care professionals: trustworthiness, honesty, beneficence, nonmaleficence, respect for autonomy, empathy, compassion, patience, courage, humility and dedication. The authors used the McNemar paired t test to compare respondents' ratings of ideal dentists with their ratings of dentists in general. Two hundred eight-five patients returned completed surveys, for a response rate of 57 percent. The authors found statistically significant differences between ideal and perceived characteristics in all but one domain. The area of greatest difference related to the domain of trustworthiness (that is, dentists should not "propose unnecessary treatments just so they can make money"). For this survey item, 98 percent of patients reported that it was very or extremely important, but only 57 percent of respondents moderately or strongly agreed that dentists in general were engaging in this practice (P dental profession and their actual impressions of dentists in general. Addressing these discrepancies may be crucial if dentistry is to continue to enjoy the public's trust.

Methodological Quality of Consensus Guidelines in Implant Dentistry.

Science.gov (United States)

Faggion, Clovis Mariano; Apaza, Karol; Ariza-Fritas, Tania; Málaga, Lilian; Giannakopoulos, Nikolaos Nikitas; Alarcón, Marco Antonio

2017-01-01

Consensus guidelines are useful to improve clinical decision making. Therefore, the methodological evaluation of these guidelines is of paramount importance. Low quality information may guide to inadequate or harmful clinical decisions. To evaluate the methodological quality of consensus guidelines published in implant dentistry using a validated methodological instrument. The six implant dentistry journals with impact factors were scrutinised for consensus guidelines related to implant dentistry. Two assessors independently selected consensus guidelines, and four assessors independently evaluated their methodological quality using the Appraisal of Guidelines for Research & Evaluation (AGREE) II instrument. Disagreements in the selection and evaluation of guidelines were resolved by consensus. First, the consensus guidelines were analysed alone. Then, systematic reviews conducted to support the guidelines were included in the analysis. Non-parametric statistics for dependent variables (Wilcoxon signed rank test) was used to compare both groups. Of 258 initially retrieved articles, 27 consensus guidelines were selected. Median scores in four domains (applicability, rigour of development, stakeholder involvement, and editorial independence), expressed as percentages of maximum possible domain scores, were below 50% (median, 26%, 30.70%, 41.70%, and 41.70%, respectively). The consensus guidelines and consensus guidelines + systematic reviews data sets could be compared for 19 guidelines, and the results showed significant improvements in all domain scores (p dentistry journals is needed. The findings of the present study may help researchers to better develop consensus guidelines in implant dentistry, which will improve the quality and trust of information needed to make proper clinical decisions.

Straightforward Case of Dental Implant in General Dentistry

Directory of Open Access Journals (Sweden)

Aji P. Tjikman

2013-07-01

Full Text Available Dental implant has become a fast developing and dynamic field in dental practice. It is acknowledged as a predictable treatment modality with high clinical success rates. Conventional fixed prostheses are no longer considered to be the first choice of treatment for replacing a missing tooth. Despite the increasing number of patients requesting dental implant treatments, there are only some clinicians who are offering implant therapy in their daily practice. The International team for Implantology described a straightforward case as a simple case such as implant placements in adquate soft and hard tissue conditions and single-tooth restorations in a non-aesthetic zone. A review of the current literature discussed the implementation of implant dentistry in universities worldwide into their curriculum for both undergraduate and postgraduate programs in general dentistry. The European consensus in implant dentistry education concluded that it is desirable to include the surgical technique for implant placement for straightforward cases into the dental curriculum. The levels and limitations to which the various aspects of implant dentistry and related skills are taught to be determined by the academic community. This review aimed at promoting awareness amongst dental practitioners and institutions in Indonesia of the shifting treatment paradigm in the maangement of a missing tooth. Hence clinicians will be able to include implant dentistry in the treatment planning of their patients and also undertake a significant part in the execution of such treatments.

Making a Good Impression at Work: National Differences in Employee Impression Management Behaviors in Japan, Korea, and the United States.

Science.gov (United States)

Krieg, Alexander; Ma, Li; Robinson, Patricia

2018-02-17

Impression management has important implications for success at work. This study explores differences in impression management in the East and West by examining the use of self-promotion, ingratiation, and exemplification directed towards three targets: supervisors, peers, and subordinates among 945 company employees from Japan, Korea, and the United States. Our results show that Korean employees used all three strategies most frequently, followed by United States, and then Japanese employees. Japanese and Korean employees used impression management strategies differentially across the three targets, and U.S. employees used impression management equally across targets. This elucidates how cultural trends in hierarchical relationships impact social behavior within the workplace. A follow-up mediation analysis found that relational or labor mobility fully mediated country differences in impression management, suggesting that culture is also reflected in larger social ecological trends in employee's ability and likelihood to change jobs, which also account for impression management strategy usage. Theoretical and practical implications for international business are discussed. This research may be useful in aligning strategies foreign employees might employ for using impression management when in Japan, Korea, and the United States.

Creating an evidence-based dentistry culture at Baylor College of Dentistry: the winds of change.

Science.gov (United States)

Hinton, Robert J; Dechow, Paul C; Abdellatif, Hoda; Jones, Daniel L; McCann, Ann L; Schneiderman, Emet D; D'Souza, Rena

2011-03-01

In the early years of the new millennium, the National Institute of Dental and Craniofacial Research of the National Institutes of Health began funding Oral Health Research Education Grants using the R25 mechanism to promote the application of basic and clinical research findings to clinical training and to encourage students to pursue careers in oral health research. This report describes the impact of an R25 grant awarded to the Texas A&M Health Science Center's Baylor College of Dentistry (BCD) on its curriculum and faculty development efforts. At BCD, the R25 grant supports a multipronged initiative that employs clinical research as a vehicle for acquainting both students and faculty with the tools of evidence-based dentistry (EBD). New coursework and experiences in all four years of the curriculum plus a variety of faculty development offerings are being used to achieve this goal. Progress on these fronts is reflected in a nascent EBD culture characterized by increasing participation and buy-in by students and faculty. The production of a new generation of dental graduates equipped with the EBD skill set as well as a growing nucleus of faculty members who can model the importance of evidence-based practice is of paramount importance for the future of dentistry.

Laser physics and a review of laser applications in dentistry for children.

Science.gov (United States)

Martens, L C

2011-04-01

The aim of this introduction to this special laser issue is to describe some basic laser physics and to delineate the potential of laser-assisted dentistry in children. A brief review of the available laser literature was performed within the scope of paediatric dentistry. Attention was paid to soft tissue surgery, caries prevention and diagnosis, cavity preparation, comfort of the patient, effect on bacteria, long term pulpal vitality, endodontics in primary teeth, dental traumatology and low level laser therapy. Although there is a lack of sufficient evidence taking into account the highest standards for evidence-based dentistry, it is clear that laser application in a number of different aetiologies for soft tissue surgery in children has proven to be successful. Lasers provide a refined diagnosis of caries combined with the appropriate preventive adhesive dentistry after cavity preparation. This will further lead to a new wave of micro-dentistry based on 'filling without drilling'. It has become clear from a review of the literature that specific laser applications in paediatric dentistry have gained increasing importance. It can be concluded that children should be considered as amongst the first patients for receiving laser-assisted dentistry.

Practice of preventive dentistry for nursing staff in primary care

Science.gov (United States)

Acuña-Reyes, Raquel; Cigarroa-Martínez, Didier; Ureña-Bogarín, Enrique; Orgaz-Fernández, Jose David

2014-01-01

Objectives: Determine the domain of preventive dentistry in nursing personnel assigned to a primary care unit. Methods: Prospective descriptive study, questionnaire validation, and prevalence study. In the first stage, the questionnaire for the practice of preventive dentistry (CPEP, for the term in Spanish) was validated; consistency and reliability were measured by Cronbach's alpha, Pearson's correlation, factor analysis with intra-class correlation coefficient (ICC). In the second stage, the domain in preventive dental nurses was explored. Results: The overall internal consistency of CPEP is α= 0.66, ICC= 0.64, CI95%: 0.29-0.87 (p >0.01). Twenty-one subjects in the study, average age 43, 81.0% female, average seniority of 12.5 were included. A total of 71.5% showed weak domain, 28.5% regular domain, and there was no questionnaire with good domain result. The older the subjects were, the smaller the domain; female nurses showed greater mastery of preventive dentistry (29%, CI95%: 0.1-15.1) than male nurses. Public health nurses showed greater mastery with respect to other categories (50%, CI95%: 0.56-2.8). Conclusions: The CDEP has enough consistency to explore the domain of preventive dentistry in health-care staff. The domain of preventive dentistry in primary care nursing is poor, required to strengthen to provide education in preventive dentistry to the insured population. PMID:25386037

Burger or yogurt? Indulgent consumption in impression management contexts.

Science.gov (United States)

Cheng, Yin-Hui; Huang, Molly C-J; Chuang, Shih-Chieh; Ju, Ying Rung

2015-10-01

We conducted three studies to investigate indulgent choice in settings with and without impression management by public-private manipulation with evaluation. Study 1 showed that the participants were less indulgent under public scrutiny due to the employment of impression management. Study 2 focused on the impression management context to test the moderate effect of self-consciousness in two impression managed contexts. Study 3 focused on context without impression management to test the moderate effects of self-awareness on choices. We found that depending on differences in primed personality, individuals tended to make choices other than those they favoured privately when anticipating that others might form impressions of them based on the decisions made. The findings of all three studies support our basic prediction that people are less indulgent under impression management and suggest that people tend to manage their impression by eating healthier (less indulgently) in public. © 2014 International Union of Psychological Science.

Dentistry 4. X-ray diagnostics

International Nuclear Information System (INIS)

2014-01-01

DIN pocketbook 267/4 gives an overview of the normative requirements of the new X-Ray and Radiation Protection Ordinance, which has been in effect since 1 November 2011. This DIN pocketbook is intended for anyone charged with professional responsibility for the use of ionizing radiation in dentistry, operators and users of x-ray devices, radiation protection officers, accredited experts, manufacturers as well as for anyone with an interest in radiation protection or optimal radiological diagnostics. It contains standards relating to the following areas: acceptance and constancy testing; devices for evaluating findings (monitors, film viewing devices), films, printers; archiving, designating, labelling. Adherence to the standards makes it possible to avoid distractive artefacts in x-ray images and optimise the quality of x-ray diagnostics in dentistry.

Advances in pediatric dentistry.

Science.gov (United States)

Yoon, Richard K; Best, Jed M

2011-07-01

This article addresses advances in 4 key areas related to pediatric dentistry: (1) caries detection tools, (2) early interventions to arrest disease progression, (3) caries-risk assessment tools, and (4) trends in pediatric procedures and dental materials. Copyright © 2011 Elsevier Inc. All rights reserved.

Graduate and Undergraduate Geriatric Dentistry Education in a Selected Dental School in Japan

Science.gov (United States)

Kitagawa, Noboru; Sato, Yuji; Komabayashi, Takashi

2010-01-01

Geriatric dentistry and its instruction are critical in a rapidly aging population. Japan is the world’s fastest-aging society, and thus geriatric dentistry education in Japan can serve as a global model for other countries that will soon encounter the issues that Japan has already confronted. This study aimed to evaluate geriatric dental education with respect to the overall dental education system, undergraduate geriatric dentistry curricula, mandatory internships, and graduate geriatric education of a selected dental school in Japan. Bibliographic data and local information were collected. Descriptive and statistical analyses (Fisher and Chi-square test) were conducted. Japanese dental schools teach geriatric dentistry in 10 geriatric dentistry departments as well as in prosthodontic departments. There was no significant differences found between the number of public and private dental schools with geriatric dentistry departments (p = 0.615). At Showa University School of Dentistry, there are more didactic hours than practical training hours; however, there is no significant didactic/practical hour distribution difference between the overall dental curriculum and fourth-year dental students’ geriatric dental education curriculum (p=0.077). Graduate geriatric education is unique because it is a four-year Ph.D. course of study; there is neither a Master’s degree program nor a certificate program in Geriatric Dentistry. Overall, both undergraduate and graduate geriatric dentistry curricula are multidisciplinary. This study contributes to a better understanding of geriatric dental education in Japan; the implications of this study include developing a clinical/didactic curriculum, designing new national/international dental public health policies, and calibrating the competency of dentists in geriatric dentistry. PMID:21985207

Application of digital diagnostic impression, virtual planning, and computer-guided implant surgery for a CAD/CAM-fabricated, implant-supported fixed dental prosthesis: a clinical report.

Science.gov (United States)

Stapleton, Brandon M; Lin, Wei-Shao; Ntounis, Athanasios; Harris, Bryan T; Morton, Dean

2014-09-01

This clinical report demonstrated the use of an implant-supported fixed dental prosthesis fabricated with a contemporary digital approach. The digital diagnostic data acquisition was completed with a digital diagnostic impression with an intraoral scanner and cone-beam computed tomography with a prefabricated universal radiographic template to design a virtual prosthetically driven implant surgical plan. A surgical template fabricated with computer-aided design and computer-aided manufacturing (CAD/CAM) was used to perform computer-guided implant surgery. The definitive digital data were then used to design the definitive CAD/CAM-fabricated fixed dental prosthesis. Copyright © 2014 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.

The complexity of patient safety reporting systems in UK dentistry.

Science.gov (United States)

Renton, T; Master, S

2016-10-21

Since the 'Francis Report', UK regulation focusing on patient safety has significantly changed. Healthcare workers are increasingly involved in NHS England patient safety initiatives aimed at improving reporting and learning from patient safety incidents (PSIs). Unfortunately, dentistry remains 'isolated' from these main events and continues to have a poor record for reporting and learning from PSIs and other events, thus limiting improvement of patient safety in dentistry. The reasons for this situation are complex.This paper provides a review of the complexities of the existing systems and procedures in relation to patient safety in dentistry. It highlights the conflicting advice which is available and which further complicates an overly burdensome process. Recommendations are made to address these problems with systems and procedures supporting patient safety development in dentistry.

Taking a step towards greener future: A practical guideline for eco-friendly dentistry

Directory of Open Access Journals (Sweden)

Rupa K R

2015-03-01

Full Text Available Humans have had a tremendous impact on the ecology and of late have rapidly damaged its delicate balance. Dentists as protectors of oral health should not limit their responsibilities to patient treatment but also inculcate methods to protect the environment as well. Thus the concept of eco-friendly dentistry or green dentistry has been introduced. Eco-dentistry or "green dentistry" is a practice of dentistry using technologies and materials that promote and protect the planet. It is a thought process, an attitude, and a guide for making earth friendly choices in dental practice. This article intends to provide guidance to practitioners about the practical changes we can make in practice, so as to minimizing the release of potential pollutants and reduce the impact of dentistry on Earth.

First Impressions.

Science.gov (United States)

Coen, Frank

1969-01-01

The unreliability of first impressions and subjective judgments is the subject of both Jane Austen's "Pride and Prejudice" and Lionel Trilling's "Of This Time, Of That Place"; consequently, the works are worthwhile parallel studies for high school students. Austen, by means of irony and subtle characterization, dramatizes the…

Green dentistry: the art and science of sustainable practice.

Science.gov (United States)

Mulimani, P

2017-06-23

Dentistry is highly energy and resource intensive with significant environmental impact. Factors inherent in the profession such as enormous electricity demands of electronic dental equipment, voluminous water requirements, environmental effects of biomaterials (before, during and after clinical use), the use of radiation and the generation of hazardous waste involving mercury, lead etc have contributed towards this. With rising temperatures across the world due to global warming, efforts are being made worldwide to mitigate the effects of environmental damage by resorting to sustainability concepts and green solutions in a myriad of ways. In such a scenario, a professional obligation and social responsibility of dentists makes it imperative to transform the practice of dentistry from a hazardous to a sustainable one, by adopting environmental-friendly measures or 'green dentistry'. The NHS in the UK has been proactive in implementing sustainability in healthcare by setting targets, developing guidance papers, initiating steering groups to develop measures and implementing actions through its Sustainable Development Unit (SDU). Such sustainable frameworks, specific to dentistry, are not yet available and even the scientific literature is devoid of studies in this field although anecdotal narratives abound. Hence this paper attempts to present a comprehensive evaluation of the existing healthcare sustainability principles, for their parallel application in the field of dentistry and lays out a blueprint for integrating the two main underlying principles of sustainability - resource use efficiency and eliminating or minimising pollution - in the day-to-day practice. The article also highlights the importance of social values, community care, engaging stakeholders, economic benefits, developing policy and providing leadership in converting the concept of green dentistry into a practised reality.

[The global impression technic in fixed dentures].

Science.gov (United States)

Lamy, M; Mainjot, A

2001-01-01

The global impression technique allows to obtain in a single stage the impression of the abutment as well as their neighboring teeth. This technique often requires the placement of one or two retraction cords in the sulcus. The impression technique herein described is the double mix method. This method is based on the use of two elastomers with different viscosities, but from the same group thus allowing a simultaneous polymerization.

Rapid Prototyping and its Application in Dentistry

Directory of Open Access Journals (Sweden)

V. N. V. Madhav

2013-01-01

Full Text Available Medical implants and biological models have three main characteristics: low volume, complex shape, and can be customized. These characteristics suit very well with Rapid Prototyping (RP and Rapid Manufacturing (RM processes. RP/RM processes are fabricated part layer- by-layer until complete shape finished from 3D model. Biocompatible materials, such as Titanium and Titanium alloy, Zirconium, Cobalt Chromium, PEEK, etc, are used for fabrication process. Reverse Engineering (RE technology greatly affects RP/RM processes. RE is used to capture or scan image of the limb, cranium, tooth, and other biological objects. Three common methods to get the image are 3D laser scanning, Computer Tomography (CT, and Magnetic Resonance Imaging (MRI. Main RP/RM techniques used in Dentistry are Stereotype Lithography Apparatus (SLA, Fused Deposition Modeling (FDM, Selective Laser Sintering (SLS, and ink jet printing. This article reviews the changing scenario of technology in dentistry with special emphasis on Rapid Prototyping and its various applications in Dentistry.

Single Visit Feeding Appliance for 1-day-old Neonate with Cleft Palate Using Safe Dental Putty-Gauze Hybrid Impression Technique for Maxillary Impression.

Science.gov (United States)

Rathee, Manu

2015-01-01

Cleft lip and palate is one of the most common craniofacial anomalies of humans. Intraoral impression making is the first clinical step in the fabrication of feeding appliance for infants with oro-nasal communication. It is difficult to control the flow of the impression material in the cleft area and undercuts in a child patient. This clinical report presents a simple and safe impression technique for maxillary impression making in neonates and infants with cleft palate. A gauze piece was used to confine the impression material during functional movements of sucking while impression making in an awake child to avoid the risk of aspiration or swallowing.

Ergonomics in Dentistry

Directory of Open Access Journals (Sweden)

Dargahi H

2010-01-01

Full Text Available Background and Aims: There are several risk factors in dentistry professional environment. Carelessness about occupational health regulation endangers dentist's life. Erconomics in dentistry is a scientific approach which introduces the latest ergonomic principles in dental profession. It discusses about physical and mental stresses. Ergonomic programs eliminate dentist physical and mental challenges and provide practical solution to establish efficient and comforting environment. Materials and Methods: This study reviewed the role and effectiveness of Ergonomics in dental profession. We used related journals, books and ergonomics websites to write this article. Conclusion: Many of researchers believe that awkward body posture and low movement are the sources of occupational disorders. Therefore, knowledge of ergonomics risk factors in dental office design is very important. Dentist's body posture and dental equipment evaluations are important factors in dental ergonomics. The most logical approach to design dental equipment for utilizing ergonomics principles is consideration of the dentist posture and type of movements and activities. In conclusion, dentists should be informed about dental ergonomics regulation and its different aspects. Furthermore, academic developments and research projects can be useful in this area.

Nanotechnology in Dentistry: Clinical Applications, Benefits, and Hazards.

Science.gov (United States)

Shashirekha, Govind; Jena, Amit; Mohapatra, Satyajit

2017-05-01

Nanotechnology is emerging as an interdisciplinary field that is undergoing rapid development and has brought about enormous changes in medicine and dentistry. Nanomaterial-based design is able to mimic some of the mechanical and structural properties of native tissue and can promote biointegration. Nanotechnology has various applications in dentistry, including dentition renaturalization, therapy for dentin hypersensitivity, complete orthodontic realignment in a single visit, covalently bonding diamondized enamel, enhancing properties of root canal sealers, and continuous oral health maintenance using mechanical dentifrobots. A range of synthetic nanoparticles such as hydroxyapatite, bioglass, titanium, zirconia, and silver nanoparticles are proposed for dental restoration. This review focuses on the developments in the field of nanomaterials in dentistry in the form of tissue regeneration materials, implantable devices, nanocomposites, endodontic sealers etc. and issues of patient safety.

Geriatric dentistry education and context in a selection of countries in 5 continents.

Science.gov (United States)

Marchini, Leonardo; Ettinger, Ronald; Chen, Xi; Kossioni, Anastassia; Tan, Haiping; Tada, Sayaka; Ikebe, Kazunori; Dosumu, Elizabeth Bosede; Oginni, Fadekemi O; Akeredolu, Patricia Adetokunbo; Butali, Azeez; Donnelly, Leeann; Brondani, Mario; Fritzsch, Bernd; Adeola, Henry A

2018-05-01

To summarize and discuss how geriatric dentistry has been addressed in dental schools of different countries regarding to (1) teaching students at the predoctoral level; (2) advanced training, and (3) research. A convenience sample of faculty members from a selection of high, upper-middle and lower-middle income countries were recruited to complete the survey. The survey had 5 open-ended main topics, and asked about (1) the size of their elderly population, (2) general information about dental education; (3) the number of dental schools teaching geriatric dentistry, and their teaching methods; (4) advanced training in geriatric dentistry; (5) scholarship/research in geriatric dentistry. (1) There is great variation in the size of elderly population; (2) duration of training and content of dental education curriculum varies; (3) geriatric dentistry has not been established as a standalone course in dental schools in the majority of the countries, (4) most countries, with the exception of Japan, lack adequate number of dentists trained in geriatric dentistry as well as training programs, and (5) geriatric dentistry-related research has increased in recent years in scope and content, although the majority of these papers are not in English. © 2018 Special Care Dentistry Association and Wiley Periodicals, Inc.

A simple method for fabricating custom sectional impression trays for making definitive impressions in patients with microstomia

OpenAIRE

Bachhav, Vinay Chila; Aras, Meena Ajay

2012-01-01

Objective: A maximum mouth opening that is smaller than the size of a complete denture can make prosthetic treatment challenging. This article describes a simple technique used to fabricate maxillary and mandibular custom sectional impression trays for making definitive impressions in patients with microstomia.

The entrepreneurial role in primary care dentistry.

Science.gov (United States)

Willcocks, S

2012-03-09

This paper explores the entrepreneurial role of dentists in primary care dentistry. It reviews the changing context of dentistry, not least the reforms being introduced by the health and social care bill. It suggests that this new context will reinforce the need to consider the business side of dental practice, in particular, the importance of quality, creativity and innovation, alongside the importance of meeting the needs of patients. An entrepreneurial approach will be required in order to sustain dental practice in an increasingly competitive environment.

Piezosurgery in dentistry

Directory of Open Access Journals (Sweden)

Dhruvakumar Deepa

2016-01-01

Full Text Available Piezosurgery (piezoelectric bone surgery is a technique of bone surgery which is gaining popularity in the field of dentistry in the recent years. This device is being used in osteotomies, periodontology and implantology, and oral surgical procedures. Piezoelectric ultrasonic vibrations are utilized to perform precise and safe osteotomies. This article discusses the equipment, biological effects on bone, and advantages and disadvantages of this technology.

Digital versus conventional implant impressions for edentulous patients: accuracy outcomes.

Science.gov (United States)

Papaspyridakos, Panos; Gallucci, German O; Chen, Chun-Jung; Hanssen, Stijn; Naert, Ignace; Vandenberghe, Bart

2016-04-01

To compare the accuracy of digital and conventional impression techniques for completely edentulous patients and to determine the effect of different variables on the accuracy outcomes. A stone cast of an edentulous mandible with five implants was fabricated to serve as master cast (control) for both implant- and abutment-level impressions. Digital impressions (n = 10) were taken with an intraoral optical scanner (TRIOS, 3shape, Denmark) after connecting polymer scan bodies. For the conventional polyether impressions of the master cast, a splinted and a non-splinted technique were used for implant-level and abutment-level impressions (4 cast groups, n = 10 each). Master casts and conventional impression casts were digitized with an extraoral high-resolution scanner (IScan D103i, Imetric, Courgenay, Switzerland) to obtain digital volumes. Standard tessellation language (STL) datasets from the five groups of digital and conventional impressions were superimposed with the STL dataset from the master cast to assess the 3D (global) deviations. To compare the master cast with digital and conventional impressions at the implant level, analysis of variance (ANOVA) and Scheffe's post hoc test was used, while Wilcoxon's rank-sum test was used for testing the difference between abutment-level conventional impressions. Significant 3D deviations (P impressions (P > 0.001). Digital implant impressions are as accurate as conventional implant impressions. The splinted, implant-level impression technique is more accurate than the non-splinted one for completely edentulous patients, whereas there was no difference in the accuracy at the abutment level. The implant angulation up to 15° did not affect the accuracy of implant impressions. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

Effects of Music on Image Impression and Relationship between Impression and Physical Properties

Science.gov (United States)

Sato, Keiko; Mitsukura, Yasue

Auditory information plays an integral role in AV media because even identical images are perceived differently when they are matched with different music. However, we now present a few studies in which the changes in subjective perceptions were analyzed on the basis of the physical properties of the perceived items. The purpose of this study is to investigate the effects of music on image impression in terms of the physical properties of images. In this paper, we first elucidate the changes in subjective impressions when the image is presented by itself and when it is presented with music. Secondly, to clarify the relation between the impression of an image or music and physical properties, we compare the different image or music perceptions with each other and also compare their respective physical properties, which include color information, structural information, and frequency characteristics. As a result, the color information of an image containing green or saturation colors and the power of the music were strongly correlated with adjectives expressing activity. Moreover, the entropy of saturation correlated with words expressing spatial extent.

Dimensional accuracy of digital dental models from cone-beam computed tomography scans of alginate impressions according to time elapsed after the impressions.

Science.gov (United States)

Lee, Sang-Mi; Hou, Yanan; Cho, Jin-Hyoung; Hwang, Hyeon-Shik

2016-02-01

Our objective was to investigate the dimensional accuracy of digital dental models obtained from the cone-beam computed tomography (CBCT) scans of alginate impressions according to the time elapsed after the impressions were taken. Alginate impressions were obtained of 20 adults using 2 alginate materials: Alginoplast (Heraeus Kulzer, Hanau, Germany) and Cavex (Cavex Holland, Haarlem, The Netherlands). These impressions were stored in wet conditions and scanned by CBCT immediately after impression-taking and after storage times of 12, 24, 36, 48, 60, and 72 hours. After reconstruction of the 3-dimensional digital dental models, the models were measured, and the data were analyzed to determine the dimensional changes according to the time elapsed. The changes within the measurement error were regarded as clinically acceptable in this study. The measurement errors ranged from 0.27 to 0.29 mm in the digital dental models obtained from CBCT scans of the alginate impressions. All measurements showed decreasing accuracy with greater elapsed time after the impressions were taken. Changes above the measurement error occurred at 24 and 36 hours for Cavex and Alginoplast, respectively. Digital dental models can be obtained from CBCT scans of alginate impressions without sending them to a remote laboratory. However, the impressions need to be scanned within 24 hours; otherwise, dimensional changes lead to errors that exceed the error of measurement. Copyright © 2016 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.

Geriatric dentistry content in the curriculum of the dental schools in Chile.

Science.gov (United States)

León, Soraya; Araya-Bustos, Francisca; Ettinger, Ronald L; Giacaman, Rodrigo A

2016-09-01

The purpose of this study was to identify the status of pre-doctoral geriatric dentistry education among all Chilean dental schools. Chile is one of the most rapidly ageing countries in Latin America. Consequently, specific knowledge and training on the needs of elderly populations need to be emphasised in dental schools. The current extent and methods of teaching geriatric dentistry among the dental schools in Chile are unknown. A web-based questionnaire was developed and sent to all 19 Chilean dental schools to identify which schools had a formal programme on geriatric dentistry and ask about their format, content and type of training of the faculty who taught in the programmes. Data were analysed, and a comparison was made among the schools. Sixteen (84%) of the participant schools reported teaching at least some aspects of geriatric dentistry, using various methodologies, but only 7 (37%) had specific courses. Of those schools reporting a didactic content on geriatric dentistry, 71% included clinical training, either in the school's dental clinics or in an extramural service. Contents mostly included demographics of ageing, theories of ageing and medical conditions. More than half of the faculty (57%) stated that they had formal training in geriatric dentistry, 43% were trained in prosthodontics, public health or other areas. Although most dental schools taught geriatric dentistry, only some had a specific course. Most schools with formal courses followed the international curriculum guidelines for geriatric dentistry. © 2014 John Wiley & Sons A/S and The Gerodontology Association. Published by John Wiley & Sons Ltd.

Curriculum content in geriatric dentistry in USA dental schools.

Science.gov (United States)

Ettinger, Ronald L; Goettsche, Zachary S; Qian, Fang

2018-03-01

The aim of this study was to re-examine the teaching of geriatric dentistry in the USA dental schools, to identify curriculum content and compare the findings to previous reports. All dental schools in the United States were contacted via email with a questionnaire to assess the teaching of geriatric dentistry. Non-responding schools were sent a minimum of three reminder emails to complete the survey. A statistical analysis was performed. Descriptive statistics were conducted to profile the variables of interest. Bivariate analysis was performed to explore if any of the variables were related using Fisher's exact test, non-parametric Wilcoxon rank-sum test and the Kruskal-Wallis test. Fifty-six of the 67 dental schools completed the questionnaire. Geriatric dentistry was taught in all dental schools; for 92.8%, the course was compulsory. We found that 62.5% were teaching it as an independent course, 25% as an organised series of lectures and 8.9% as occasional lectures in parts of other courses. Clinically, 84.2% have some form of compulsory education in geriatric dentistry. Public schools were marginally associated with an increased interest in expanding the geriatric dentistry curriculum (P = .078). No differences were found between these variables and school location. Geriatric dentistry is now required in 92.8% of dental schools. The teaching of traditional topics has not changed much; however, the number of gerontological topics has increased. Clinical teaching needs to be expanded, as in only 57.1% of schools was it a requirement. The ageing imperative will require research to determine the impact of teaching on services to the geriatric community. © 2017 John Wiley & Sons A/S and The Gerodontology Association. Published by John Wiley & Sons Ltd.

21 CFR 872.3670 - Resin impression tray material.

Science.gov (United States)

2010-04-01

... (CONTINUED) MEDICAL DEVICES DENTAL DEVICES Prosthetic Devices § 872.3670 Resin impression tray material. (a) Identification. Resin impression tray material is a device intended for use in a two-step dental mold fabricating... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Resin impression tray material. 872.3670 Section...

Stem cells in dentistry--part I: stem cell sources.

Science.gov (United States)

Egusa, Hiroshi; Sonoyama, Wataru; Nishimura, Masahiro; Atsuta, Ikiru; Akiyama, Kentaro

2012-07-01

Stem cells can self-renew and produce different cell types, thus providing new strategies to regenerate missing tissues and treat diseases. In the field of dentistry, adult mesenchymal stem/stromal cells (MSCs) have been identified in several oral and maxillofacial tissues, which suggests that the oral tissues are a rich source of stem cells, and oral stem and mucosal cells are expected to provide an ideal source for genetically reprogrammed cells such as induced pluripotent stem (iPS) cells. Furthermore, oral tissues are expected to be not only a source but also a therapeutic target for stem cells, as stem cell and tissue engineering therapies in dentistry continue to attract increasing clinical interest. Part I of this review outlines various types of intra- and extra-oral tissue-derived stem cells with regard to clinical availability and applications in dentistry. Additionally, appropriate sources of stem cells for regenerative dentistry are discussed with regard to differentiation capacity, accessibility and possible immunomodulatory properties. Copyright © 2012 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.

Advanced functional polymers for regenerative and therapeutic dentistry.

Science.gov (United States)

Lai, W-F; Oka, K; Jung, H-S

2015-07-01

Use of ceramics and polymers continues to dominate clinical procedures in modern dentistry. Polymers have provided the basis for adhesives, tissue void fillers, and artificial replacements for whole teeth. They have been remarkably effective in the clinic at restoration of major dental functions after damage or loss of teeth. With the rapid development of polymer science, dental materials science has significantly lagged behind in harnessing these advanced polymer products. What they offer is new and unique properties superior to traditional polymers and crucially a range of properties that more closely match natural biomaterials. Therefore, we should pursue more vigorously the benefits of advanced polymers in dentistry. In this review, we highlight how the latest generation of advanced polymers will enhance the application of materials in the dental clinic using numerous promising examples. Polymers have a broad range of applications in modern dentistry. Some major applications are to construct frameworks that mimic the precise structure of tissues, to restore tooth organ function, and to deliver bioactive agents to influence cell behavior from the inside. The future of polymers in dentistry must include all these new enhancements to increase biological and clinical effectiveness beyond what can be achieved with traditional biomaterials. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

Departments of Social Dentistry--An Update for the 1980s.

Science.gov (United States)

Waldman, H. Barry; Siegal, Stanley E.

1980-01-01

A review of the development and present status of departments of social dentistry is provided, along with a discussion of evolving programs and need for a change in the relationship between departments of social dentistry and the general school teaching programs. (JSR)

The Era of Whiter Teeth: Advertising American Dentistry 1910-1950

DEFF Research Database (Denmark)

Grumsen, Stine

2009-01-01

It has often been argued that the public image of dentists has been tainted by association with fear and pain into an image of evil ‘psychodontists' and that there is an apparent lack of ‘role models' in popular film, television, art and literature concerned with dentistry. This paper argues...... that we get a different picture when looking at different media. Advertisements introduce into a public domain, positive images of dentistry which crucially differ from the images found in other popular media. This paper traces the public image of dentistry in early 20th-century America, as seen through...... dentifrice advertisements, and suggests three important reasons for studying advertisements: First, advertisements provide a supplement to studies of popular images of dentistry carried out so far. Second, advertisements have played an important part in advancing oral hygiene as a public concern. And third...

Book appraisal: history of dentistry in Nigeria | Michael ... - Ibadan

African Journals Online (AJOL)

The book appraised in this edition of Chronicles of Medical History, History of Dentistry in Nigeria, is a product of many years of painstaking research. The Author, Professor Eyitope Ogunbodede, has put together an excellent book that is a great work of art. Dentistry is one of the first specialties in medicine with a very long ...

Lifting bloody footwear impressions using alginate casts followed by chemical enhancement.

Science.gov (United States)

Wiesner, Sarena; Izraeli, Elad; Shor, Yaron; Domb, Avi

2013-05-01

A method for lifting bloody footwear impressions using alginate casts and enhancing the lifted impressions with amido black is presented. On rough or dark substrates, background interferences may conceal significant details of footwear impressions. Illumination with alternative light sources and chemically enhancing the bloody footwear impressions may reveal additional details, but sometimes, lifting footwear impressions prior to enhancing is the only way to expose hidden details (by using blood reagents not adequate on the original). Several cast formulations were tested for lifting the footwear impressions. The best results were achieved using Aroma fine®. Enhancement of the footwear impressions was attempted with several reagents prior to lifting, during the casting process, and on the lifted footwear impressions. Applying amido black to footwear impressions lifted with alginate produced the sharpest and most detailed footwear impressions. Alginate castings followed by chemical enhancement with amido black may produce high-quality footwear impressions for comparison. © 2013 American Academy of Forensic Sciences.

New UK graduates' knowledge of training and service provision within restorative dentistry - a survey.

Science.gov (United States)

Kalsi, A S; Kochhar, S; Lewis, N J; Hemmings, K W

2017-06-09

Objective To assess new UK graduates' knowledge of training and service provision within restorative dentistry.Design A national descriptive cross-sectional survey.Subjects and methods An online survey assessing clinicians' knowledge of restorative dentistry, who had graduated within the last four years in the UK, was distributed across the UK via postgraduate dental deaneries. One-hundred responses were accepted as a sample of a potential population of 4,000.Main outcome measure How well respondents understood the service provision and training aspects of the specialty of restorative dentistry.Results The responses were received from graduates from a variety of dental schools across the UK. Of those respondents, 41 reported receiving career guidance within restorative dentistry. 45 new graduates were confident in their understanding of the specialty, while 53 were confident in the differences between restorative dentistry and monospecialty training. The respondents appeared unaware regarding treatment priorities within restorative dentistry departments. Most respondents felt that receiving teaching on restorative dentistry as a specialty and career pathway would be beneficial.Conclusion The results suggest that new graduates may benefit from clarification regarding the specialty of restorative dentistry, however, caution must be taken due to the limitations of the study.

The era of whiter teeth: advertising in American dentistry 1910-1950.

Science.gov (United States)

Grumsen, Stine

2009-01-01

It has often been argued that the public image of dentists has been tainted by association with fear and pain into an image of evil 'psychodontists' and that there is an apparent lack of 'role models' in popular film, television, art and literature concerned with dentistry. This paper argues that we get a different picture when looking at different media. Advertisements introduce into a public domain, positive images of dentistry which crucially differ from the images found in other popular media. This paper traces the public image of dentistry in early 20th-century America, as seen through dentifrice advertisements, and suggests three important reasons for studying advertisements: First, advertisements provide a supplement to studies of popular images of dentistry carried out so far. Second, advertisements have played an important part in advancing oral hygiene as a public concern. And third, advertisements provide the historian of dentistry with a unique opportunity for analyzing the complex and interwoven relationship of popular and professional discourses, since ads have acted as catalysts for professional discussions and self-reflection among dentists.

Dental anxiety: a comparison of students of dentistry, biology, and psychology

Directory of Open Access Journals (Sweden)

Storjord HP

2014-09-01

Full Text Available Helene Persen Storjord,1 Mari Mjønes Teodorsen,1 Jan Bergdahl,1 Rolf Wynn,2,3 Jan-Are Kolset Johnsen1 1Department of Clinical Dentistry, 2Department of Clinical Medicine, UiT - The Arctic University of Norway, 3Division of Addictions and Specialized Psychiatric Services, University Hospital of North Norway, Tromsø, Norway Introduction: Dental anxiety is an important challenge for many patients and clinicians. It is thus of importance to know more about dental students' own experiences with dental anxiety and their understanding of dental anxiety. The aim was to investigate differences in dental anxiety levels between dental students, psychology students, and biology students at a Norwegian university. Materials and methods: A total of 510 students of dentistry, psychology, and biology at the University of Tromsø received a questionnaire consisting of the Modified Dental Anxiety Scale, demographic questions, and questions relating to their last visit to the dentist/dental hygienist; 169 students gave complete responses. Nonparametric tests were used to investigate differences between the student groups. Results: The respondents were 78% female and 22% male; their mean age was 24 years. The dental students showed a significantly lower degree of dental anxiety than the psychology (P<0.001 and biology students (P<0.001. A significant decrease in dental anxiety levels was found between novice and experienced dentistry students (P<0.001. Discussion: The dental students had less dental anxiety compared to psychology students and biology students. Experienced dental students also had less dental anxiety than novice dental students. This could indicate that the dentistry program structure at the university may influence dental anxiety levels. Conclusion: Dental anxiety seemed to be less frequent in dentistry students compared to students of biology or clinical psychology. The practice-oriented dentistry education at the university might contribute to

Assessing the accuracy of elastomeric Impression materials in reline method

OpenAIRE

MH. Shahrodi; M. Emamie

1995-01-01

The accuracy of relined impressions is usually acceptable and in some cases is even more accurate than principal impression. Relined Polysulfide and condensational silicone impressions are more accurate than polyether impressions. The reline method compared to retaking them is more economic and needs less chair time.

Accuracy of implant transfer with open-tray and closed-tray impression techniques and surface detail reproduction of the tooth during impression

Directory of Open Access Journals (Sweden)

Hakimeh Siadat

2012-01-01

Full Text Available Background and Aims: Accurate recording of implant location is required to achieve passive fit and have the implants without stress concentration. The aim of this in-vitro study was to evaluate the dimensional and angular accuracy of open-tray and closed-tray impression techniques using polyether impression material and also to assess the surface detail reproduction of the tooth while impression making.Materials and Methods: One reference metal model with 2 implants (Implantium on the position of the maxillary second premolar and first molar and one molar tooth for evaluation of surface details was prepared. 27 polyether impressions of these models were made (9 using open-tray, 9 using closed-tray techniques and 9 were made just of the surface of the teeth without any implants. Impressions were poured with ADA type IV stone. Coordinate Measuring Machine was used for measuring the dimensional accuracy and video measuring machine for surface detail reproduction. All of these measurements were compared with the measurements on the reference model. Data were analyzed by and compared by T-test and One-way ANOVA.Results: There was a significant statistical difference between open-tray and closed-tray techniques (P0.05.Conclusion: The accuracy of open-tray impression technique was more than closed-tray technique. The surface detail reproduction of the tooth was not affected by impression technique.

Full arch scans: conventional versus digital impressions--an in-vitro study.

Science.gov (United States)

Ender, A; Mehl, A

2011-01-01

The digital intraoral impression has become a central part of the CAD/CAM technique. The objective of the present study was to compare the accuracy (trueness and precision) of digital impressions of the full arch with that of conventional impressions on the in-vitro model. For this purpose, a master model was acquired with a new reference scanning process, the measuring trueness of which was +/- 4.1 microm and the precision +/- 2.5 microm. On the one hand, conventional impressions and then plaster models (n = 5) were produced from this master model, and on the other hand, digital impressions were made with the Cerec AC Bluecam and the Lava COS system (each n = 5). The plaster models were also scanned with the reference scanner. The available data records were superimposed and the differences determined. The deviation from the master model defines the trueness of the impression method. The deviations of the models among one another demonstrate the precision of the method. The trueness of the impressions was 55 +/- 21.8 microm in the conventional impression group, for digital impressions with Cerec Bluecam it was 49 +/- 14.2 microm and for digital impressions with Lava COS 40.3 +/- 14.1 microm. The precision was 61.3 +/- 17.9 microm for conventional impression with Impregum, 30.9 +/- 7.1 microm for digital impression with the Cerec Bluecam and 60.1 +/- 31.3 microm for digital impression with Lava COS. These in-vitro results show that accuracy of the digital impression is similar to that of the conventional impression. These results will have to be confirmed in further clinical studies.

Use of low fusing alloy in dentistry.

Science.gov (United States)

Wee, A G; Schneider, R L; Aquilino, S A

1998-11-01

Low fusing alloy has been used in dentistry for remount procedures in both fixed and removable prosthodontics, in implant prosthodontics for the fabrication of solid implant casts, in maxillofacial prosthetics as oral radiation shields, and in dental research for its unique properties. Previously, the use of low fusing alloy was thought to offer a high degree of dimensional accuracy. However, multiple in vitro studies have shown that its presumed dimensional accuracy may be questionable. This article reviews the physical properties, metallurgical considerations of low fusing alloy, its applications in dentistry, and a safe, simple method of using low fusing alloy.

Errors in dentistry: a call for apology.

Science.gov (United States)

Schwartz, Barry

2005-01-01

Bad outcomes occur in dentistry and sometimes these are the results of dental errors. In both cases, this essay will argue that apologies are very important in maintaining a relationship with the patient that is based on trust and mutual respect. Nevertheless, apologies are often not forthcoming in dentistry for a number of reasons that deserve careful examination. In particular, the dentist's fear that an apology will increase the risk of legal harm will be critiqued. Ethical and psychological reasons for making an apology will be discussed, and strategies to assist clinicians in making an apology will be offered.

Victorian era esthetic and restorative dentistry: an advertising trade card gallery.

Science.gov (United States)

Croll, Theodore P; Swanson, Ben Z

2006-01-01

A chief means of print advertising in the Victorian era was the "trade card." Innumerable products, companies, and services were highlighted on colorful chromolithographic trade cards, and these became desirable collectible objects which were pasted into scrapbooks and enjoyed by many families. Dentistry- and oral health-related subjects were often depicted on Victorian trade cards, and esthetic and restorative dentistry themes were featured. This review describes the history of advertising trade cards and offers a photographic gallery of dentistry-related cards of the era.

DİŞ HEKİMLİĞİNDE NANO TEKNOLOJİ Nanotechnology in Dentistry

OpenAIRE

SIRIK, Z. Selin; IŞIK ÖZKOL, Gülbahar

2014-01-01

Nanotechnology is a natural result derived from scientific development occurring on an atomic level. Nanotechnology, basically, is the science of manipulating matter at nanometer level and its application in dentistry is called nanodentistry. Although the nanoscale is small in size, its potential is vast. This paper includes examples for recent development of nanoproducts and provides a glimpse of nanotechnological applications in dentistry. New potential treatment opportunities in dentistry ...

Impression Management Training: Conceptualization and Application to Personal Selling.

Science.gov (United States)

Leathers, Dale G.

1988-01-01

Discusses the importance of impression management, an individual's conscious attempt to exercise control over selected communicative behaviors and cues for purposes of making a desired impression. Provides a comprehensive conceptualization of the impression-management process, and demonstrates how this process can facilitate effective training of…

Social relevance enhances memory for impressions in older adults.

Science.gov (United States)

Cassidy, Brittany S; Gutchess, Angela H

2012-01-01

Previous research has demonstrated that older adults have difficulty retrieving contextual material over items alone. Recent research suggests this deficit can be reduced by adding emotional context, allowing for the possibility that memory for social impressions may show less age-related decline than memory for other types of contextual information. Two studies investigated how orienting to social or self-relevant aspects of information contributed to the learning and retrieval of impressions in young and older adults. Participants encoded impressions of others in conditions varying in the use of self-reference (Experiment 1) and interpersonal meaningfulness (Experiment 2), and completed memory tasks requiring the retrieval of specific traits. For both experiments, age groups remembered similar numbers of impressions. In Experiment 1 using more self-relevant encoding contexts increased memory for impressions over orienting to stimuli in a non-social way, regardless of age. In Experiment 2 older adults had enhanced memory for impressions presented in an interpersonally meaningful relative to a personally irrelevant way, whereas young adults were unaffected by this manipulation. The results provide evidence that increasing social relevance ameliorates age differences in memory for impressions, and enhances older adults' ability to successfully retrieve contextual information.

Impression Management and Organizational Performance: the Portuguese case

OpenAIRE

Borges, Maria de Fátima Ribeiro

2013-01-01

This study assesses the influence of performance in the adoption of impression management strategies. The study conducts a content analysis of a sample of 45 chairman’s statements, included in the annual reports for 2010 Portuguese companies in the non-finance sector. Findings indicate that performance does not explain impression management.Consistent with social psychology theory of impression management, larger companies present a favourable image of the firm, however consistent with ...

The assessment of dentistry status in districts with unfavourable ecological situation

International Nuclear Information System (INIS)

Kopbaeva, M.T.; Gusev, B.I.; Ajdzhanov, M.M.; Sadykov, R.Kh.

1996-01-01

The problem of ecological influence on health level, including dentistry is extremely actual. In this connection the attempt of study of Semipalatinsk region population's mouth status was undertaken. For assessment of dentistry status have been 9779 inhabitants of Abaj, Beskargaj, Zhana-Semej, Borodulikhinskij districts and Semipalatinsk city were examined. The 3289 inhabitants of Kokpekty district according WHO recommendations with use methodic of definition of dentistry level of health were examined also. The insensitivity of paradonta diseases by CPITN indexes is given. Diseases of mouth mucous most diagnose are adduced

SUMO modification through rapamycin-mediated heterodimerization reveals a dual role for Ubc9 in targeting RanGAP1 to nuclear pore complexes

International Nuclear Information System (INIS)

Zhu Shanshan; Zhang Hong; Matunis, Michael J.

2006-01-01

SUMOs (small ubiquitin-related modifiers) are eukaryotic proteins that are covalently conjugated to other proteins and thereby regulate a wide range of important cellular processes. The molecular mechanisms by which SUMO modification influences the functions of most target proteins and cellular processes, however, remain poorly defined. A major obstacle to investigating the effects of SUMO modification is the availability of a system for selectively inducing the modification or demodification of an individual protein. To address this problem, we have developed a procedure using the rapamycin heterodimerizer system. This procedure involves co-expression of rapamycin-binding domain fusion proteins of SUMO and candidate SUMO substrates in living cells. Treating cells with rapamycin induces a tight association between SUMO and a single SUMO substrate, thereby allowing specific downstream effects to be analyzed. Using RanGAP1 as a model SUMO substrate, the heterodimerizer system was used to investigate the molecular mechanism by which SUMO modification targets RanGAP1 from the cytoplasm to nuclear pore complexes (NPCs). Our results revealed a dual role for Ubc9 in targeting RanGAP1 to NPCs: In addition to conjugating SUMO-1 to RanGAP1, Ubc9 is also required to form a stable ternary complex with SUMO-1 modified RanGAP1 and Nup358. As illustrated by our studies, the rapamycin heterodimerizer system represents a novel tool for studying the molecular effects of SUMO modification

Handling of Polyvinylsiloxane Versus Polyether for Implant Impressions.

Science.gov (United States)

Farhan, Daniel; Lauer, Wiebke; Heydecke, Guido; Aarabi, Ghazal; Reissmann, Daniel R

2016-01-01

This study compared polyvinylsiloxane with polyether in handling dental impressions. Each participant (N = 39) made four impressions, each a combination of pickup and reseating techniques with polyether or polyvinylsiloxane, of one implant cast representing a specific clinical situation (tooth gaps, limited residual dentition, or edentulous jaw). Handling of impressions was subsequently rated by using a 12-item questionnaire with 100-mm visual analog scales. While mean satisfaction scores were higher for polyvinylsiloxane than for polyether (69.5/63.0, P < .001), differences among subgroups were statistically significant only for pickup technique, limited residual dentition, and edentulous jaw. Implant impressions made with polyvinylsiloxane using a pickup technique seem to be the best option for most clinical situations.

book appraisal: history of dentistry in nigeria chronicles of medical ...

African Journals Online (AJOL)

Dentistry in Healthcare. From modest foundations, the specialty of dentistry has grown to become one of the most relevant service providers of healthcare in the community. A large proportion of every community seeks after dentists. The importance of proper care of the teeth cannot be over-emphasized. The mouth is the ...

Single Visit Feeding Appliance for 1-day-old Neonate with Cleft Palate Using Safe Dental Putty-Gauze Hybrid Impression Technique for Maxillary Impression

OpenAIRE

Rathee, Manu

2015-01-01

Cleft lip and palate is one of the most common craniofacial anomalies of humans. Intraoral impression making is the first clinical step in the fabrication of feeding appliance for infants with oro-nasal communication. It is difficult to control the flow of the impression material in the cleft area and undercuts in a child patient. This clinical report presents a simple and safe impression technique for maxillary impression making in neonates and infants with cleft palate. A gauze piece was us...

Botulinum toxin a can positively impact first impression.

Science.gov (United States)

Dayan, Steven H; Lieberman, Elliot D; Thakkar, Nirav N; Larimer, Karen A; Anstead, Amy

2008-06-01

BACKGROUND First impression is influenced by facial appearance and improved by cosmetic surgery. OBJECTIVE We wanted to determine if treatment with botulinum toxin A (BTxnA) would improve first impression. MATERIALS AND METHODS Women received BTxnA in the forehead. Photos were taken prior to, and 1 week after, final BTxnA injection in smiling and relaxed poses. Photos were divided into books with each subject represented only once. Evaluators completed a survey rating first impression on various measures of success for each photo. RESULTS No differences were seen for social skills, financial, or relationship success scales. A significant decrease in first impression scores between treatment photos was seen for academic performance and occupational success. However, analysis of between-subject effects found that "smile/relax" accounted for the decreased score in both scales. Significant increases in first impression scores were seen for dating success, attractiveness, and athletic success scales where smile/relax and BTxnA contributed significantly to the improved scores. CONCLUSIONS BTxnA improved first impression scores for dating success, attractiveness, and athletic success scales. Academic performance and occupational success scores were not affected by BTxnA when the smile/relax variable was included. The smile/relax variable was a more important predictor for academic performance and occupational success scores.

Sport fans' impressions of gay male athletes.

Science.gov (United States)

Campbell, Jamonn; Cothren, Denise; Rogers, Ross; Kistler, Lindsay; Osowski, Anne; Greenauer, Nathan; End, Christian

2011-01-01

The purpose of this study was to examine sport fans' impressions of gay male athletes. Participants formed impressions of a fictional athlete from their favorite team after reading a short scenario about the player. The scenarios described the athlete as being gay or straight, and either becoming a distraction or not causing a distraction to the team. While males' ratings of the athlete did not significantly differ, female fans formed significantly more positive impressions of the gay male player than the straight athlete. These results are discussed in terms of the ingroup bias and the shifting culture of homophobia in sport.

Impression cytology diagnosis of ulcerative eyelid malignancy.

Science.gov (United States)

Sen, S; Lyngdoh, A D; Pushker, N; Meel, R; Bajaj, M S; Chawla, B

2015-02-01

The utility of impression cytology in ocular diseases has predominantly been restricted to the diagnosis of dry eye, limbal stem cell deficiency and conjunctival neoplasias. Its role in malignant eyelid lesions remains largely unexplored. Although scrape cytology is more popular for cutaneous lesions, impression cytology, being non-traumatic, has an advantage in small and delicate areas such as the eyelid. The present study has been designed to evaluate its role in the diagnosis and management of malignant eyelid lesions. Thirty-two histopathologically proven malignant eyelid lesions diagnosed over a 2-year period, including 13 basal cell carcinomas, 11 sebaceous carcinomas, four squamous cell carcinomas, two malignant melanomas and two poorly differentiated carcinomas, formed the study group. The results of impression cytology were compared with those of histopathology in the study group and with an age- and sex-matched group of benign cases as controls. The sensitivity of impression cytology was 84% (27/32) for the diagnosis of malignancy and 28% (9/32) for categorization of the type of malignancy. Impression cytology is a simple, useful, non-invasive technique for the detection of malignant ulcerative eyelid lesions. It is especially useful as a follow-up technique for the detection of recurrences. © 2014 John Wiley & Sons Ltd.

Accuracy of Digital vs. Conventional Implant Impressions

Science.gov (United States)

Lee, Sang J.; Betensky, Rebecca A.; Gianneschi, Grace E.; Gallucci, German O.

2015-01-01

The accuracy of digital impressions greatly influences the clinical viability in implant restorations. The aim of this study is to compare the accuracy of gypsum models acquired from the conventional implant impression to digitally milled models created from direct digitalization by three-dimensional analysis. Thirty gypsum and 30 digitally milled models impressed directly from a reference model were prepared. The models were scanned by a laboratory scanner and 30 STL datasets from each group were imported to an inspection software. The datasets were aligned to the reference dataset by a repeated best fit algorithm and 10 specified contact locations of interest were measured in mean volumetric deviations. The areas were pooled by cusps, fossae, interproximal contacts, horizontal and vertical axes of implant position and angulation. The pooled areas were statistically analysed by comparing each group to the reference model to investigate the mean volumetric deviations accounting for accuracy and standard deviations for precision. Milled models from digital impressions had comparable accuracy to gypsum models from conventional impressions. However, differences in fossae and vertical displacement of the implant position from the gypsum and digitally milled models compared to the reference model, exhibited statistical significance (p<0.001, p=0.020 respectively). PMID:24720423

Development of Prototype Outcomes-Based Training Modules for Aesthetic Dentistry

Science.gov (United States)

Andres, Maricar Joy T.; Borabo, Milagros L.

2015-01-01

The objective of the study is to know the essential components of Aesthetic Dentistry that will be a basis for prototype Outcomes-based training modules. Using a 5-point Likert scale, the researcher-made questionnaire assessed the different elements of Aesthetic Dentistry which are needed in the designing of the training module, the manner of…

Entrepreneurial Knowledge and Aspirations of Dentistry Students in South Africa

Science.gov (United States)

Brijlal, Pradeep; Brijlal, Priscilla

2013-01-01

An investigation of the intentions and knowledge of entrepreneurship of final-year university dentistry students is reported, with particular regard to the factors of gender and race. A questionnaire survey was used with final-year dentistry students, over two years, at the University of the Western Cape in South Africa. The findings show that…

Complete Denture Impression Techniques Practiced by Private Dental Practitioners: A Survey

OpenAIRE

Kakatkar, Vinay R.

2012-01-01

Impression making is an important step in fabricating complete dentures. A survey to know the materials used and techniques practiced while recording complete denture impressions was conducted. It is disheartening to know that 33 % practitioners still use base plate custom trays to record final impressions. 8 % still use alginate for making final impressions. An acceptable technique for recording CD impressions is suggested.

Consumer-driven and commercialised practice in dentistry: an ethical and professional problem?

Science.gov (United States)

Holden, A C L

2018-03-20

The rise and persistence of a commercial model of healthcare and the potential shift towards the commodification of dental services, provided to consumers, should provoke thought about the nature and purpose of dentistry and whether this paradigm is cause for concern. Within this article, whether dentistry is a commodity and the legitimacy of dentistry as a business is explored and assessed. Dentistry is perceived to be a commodity, dependent upon the context of how services are to be provided and the interpretation of the patient-professional relationship. Commercially-focused practices threaten the fiduciary nature of the interaction between consumer and provider. The solution to managing commercial elements within dentistry is not through rejection of the new paradigm of the consumer of dental services, but in the rejection of competitive practices, coercive advertising and the erosion of professional values and duty. Consumerism may bring empowerment to those accessing dental services. However, if the patient-practitioner relationship is reduced to a mere transaction in the name of enhanced consumer participation, this empowerment is but a myth.

An in vitro comparison of photogrammetric and conventional complete-arch implant impression techniques.

Science.gov (United States)

Bergin, Junping Ma; Rubenstein, Jeffrey E; Mancl, Lloyd; Brudvik, James S; Raigrodski, Ariel J

2013-10-01

Conventional impression techniques for recording the location and orientation of implant-supported, complete-arch prostheses are time consuming and prone to error. The direct optical recording of the location and orientation of implants, without the need for intermediate transfer steps, could reduce or eliminate those disadvantages. The objective of this study was to assess the feasibility of using a photogrammetric technique to record the location and orientation of multiple implants and to compare the results with those of a conventional complete-arch impression technique. A stone cast of an edentulous mandibular arch containing 5 implant analogs was fabricated to create a master model. The 3-dimensional (3D) spatial orientations of implant analogs on the master model were measured with a coordinate measuring machine (CMM) (control). Five definitive casts were made from the master model with a splinted impression technique. The positions of the implant analogs on the 5 casts were measured with a NobelProcera scanner (conventional method). Prototype optical targets were attached to the master model implant analogs, and 5 sets of images were recorded with a digital camera and a standardized image capture protocol. Dimensional data were imported into commercially available photogrammetry software (photogrammetric method). The precision and accuracy of the 2 methods were compared with a 2-sample t test (α=.05) and a 95% confidence interval. The location precision (standard error of measurement) for CMM was 3.9 µm (95% CI 2.7 to 7.1), for photogrammetry, 5.6 µm (95% CI 3.4 to 16.1), and for the conventional method, 17.2 µm (95% CI 10.3 to 49.4). The average measurement error was 26.2 µm (95% CI 15.9 to 36.6) for the conventional method and 28.8 µm (95% CI 24.8 to 32.9) for the photogrammetric method. The overall measurement accuracy was not significantly different when comparing the conventional to the photogrammetric method (mean difference = -2.6 µm, 95% CI

Nanotechnology and its Application in Dentistry

African Journals Online (AJOL)

Departments of Restorative Dentistry, College of Medicine, University of Ibadan, 1College of Health Sciences, .... control over nerve‑impulse traffic in any tooth that requires ... Nanoparticles have also been used as sterilizing solution in.

Randomized controlled trials in dentistry: common pitfalls and how to avoid them.

Science.gov (United States)

Fleming, Padhraig S; Lynch, Christopher D; Pandis, Nikolaos

2014-08-01

Clinical trials are used to appraise the effectiveness of clinical interventions throughout medicine and dentistry. Randomized controlled trials (RCTs) are established as the optimal primary design and are published with increasing frequency within the biomedical sciences, including dentistry. This review outlines common pitfalls associated with the conduct of randomized controlled trials in dentistry. Common failings in RCT design leading to various types of bias including selection, performance, detection and attrition bias are discussed in this review. Moreover, methods of minimizing and eliminating bias are presented to ensure that maximal benefit is derived from RCTs within dentistry. Well-designed RCTs have both upstream and downstream uses acting as a template for development and populating systematic reviews to permit more precise estimates of treatment efficacy and effectiveness. However, there is increasing awareness of waste in clinical research, whereby resource-intensive studies fail to provide a commensurate level of scientific evidence. Waste may stem either from inappropriate design or from inadequate reporting of RCTs; the importance of robust conduct of RCTs within dentistry is clear. Optimal reporting of randomized controlled trials within dentistry is necessary to ensure that trials are reliable and valid. Common shortcomings leading to important forms or bias are discussed and approaches to minimizing these issues are outlined. Copyright © 2014 Elsevier Ltd. All rights reserved.

Going green with eco-friendly dentistry.

Science.gov (United States)

Avinash, Bhagyalakshmi; Avinash, B S; Shivalinga, B M; Jyothikiran, S; Padmini, M N

2013-07-01

Eco-friendly dentistry is currently transforming the medical and dental field to decrease its affect on our natural environment and reduce the amount of waste being produced. Eco-friendly dentistry uses a sustainable approach to encourage dentists to implement new strategies to try and reduce the energy being consumed and the large amount of waste being produced by the industry. Many reasonable, practical and easy alternatives do exist which would reduce the environmental footprint of a dental office were it to follow the 'green' recommendations. Dentist should take a leading role in the society by implementing 'green' initiatives to lessen their impact on the environment. This article provides a series of 'green' recommendations that dentists around the world can implement to become a leading Stewards of the environment.

Radiation protection awareness in dentistry students

International Nuclear Information System (INIS)

Mehdizadeh, S.; Vaziefehdoust, S.

2007-01-01

Complete text of publication follows. Dentistry students were assessed in one of the school of dentistry in Iran. 11% of responders had attended a radiation protection course. This study showed that those who have attended this course had improved knowledge of ALARA principle, assessment of the impact of digital imaging in patient dose reduction and usage of personal dosimeter systems. Course attendance made no considerable difference to knowledge of the patient dose, dose reduction techniques and annual permissible dose limits of general public and radiation workers. The results of this study revealed that the majority of students have not received adequate radiation protection teaching and even if a course has been attended, overall knowledge is still poor and formal teaching at undergraduate level should be corrected in the future.

Study on Personality Types of Dentists in different Disciplines of Dentistry.

Science.gov (United States)

Al-Dlaigan, Yousef H; Alahmari, Albatool S; Almubarak, Sara H; Alateeq, Sahar A; Anil, Sukumaran

2017-07-01

The purpose of this study was to determine the most common personality type among dentists in seven selected clinical dentistry specialties using the Myers-Briggs Type Indicator (MBTI) and to compare between these different types of personalities. A survey containing the MBTI and demographic and practice questions was used to assess the personality styles of 243 dental specialists in Riyadh, Saudi Arabia. The survey results were analyzed using descriptive statistics. The results of the MBTI for 243 specialist dentists revealed, generally, a higher percentage of scoring for introversion (I) with an average of 65% than extroversion (E). The study identified 10 common personality types among these specialists: ISTJ, ISFJ, INFJ, ISTP, INFP, INTP, ENFP, ENTP, ENFJ, and ENTJ (extraversion-introversion (E-I), sensing-intuition (S-N), thinking-feeling (T-F), and judging-perception (J-P)). The dominant personality type in all seven clinical specialties in dentistry was ISTJ, with an average of 54%. The personality types showed variation among the seven clinical dentistry specialties. However, among these seven clinician's specialties in dentistry, more than 50% of the individuals shared one common type of personality (ISTJ). The identification of the personality type might help in their association with coworkers, students, and patients as well as knowing the individual preferences toward different specialties in dentistry.

Finally in Italy the School of Specialisation in Paediatric Dentistry!

Science.gov (United States)

Marzo, G

2017-06-01

After over two decades of discussions, promises and indecisions, the year 2016 marked the birth of the School of Specialisation in Paediatric Dentistry, which is now a reality. The importance of dental post-graduate specialisation schools has been debated since the Degree Course in Dentistry was established. Previously, in Italy only two dental branches - Oral Surgery and Orthodontics - had obtained the recognition that a School of Specialisation entails. Today, with specific training and the newly- established hyper-specialisation in Paediatric Dentistry, the future of the profession is brighter than ever. This will allow dental professionals to provide the best cure to our young patients but it especially marks and recognises the importance of prevention in general. Having established a Specialty School in Paediatric Dentistry is also important to keep the pace with the other European countries where this postgraduate course has been already offered for many years. In my opinion, training professionals with a solid specialisation based both on cultural insights and hands-on clinical activities translates into the possibility of making true prevention. The ultimate goal of paediatric dentists, as well as paediatricians, is certainly to treat young patients but also and above all to accompany them toward an adulthood possibly free of pathologies. With an eye to a future where Paediatric Dentistry will be at the core of dental and orthodontic prevention, I wish great success to all the many specialisation schools established within the Italian Universities.

A psychosocial approach to dentistry for the underserved: incorporating theory into practice.

Science.gov (United States)

Flaer, Paul J; Younis, Mustafa Z; Benjamin, Paul L; Al Hajeri, Maha

2010-01-01

Dentistry for the underserved is more than an egalitarian social issue--it is a key factor in the health and social progress of our nation. The first signs or manifestations of several diseases such as varicella (i.e., chicken pox and shingles), STDs, and influenza become apparent in the oral cavity. The value of access to quality dentistry is an immeasurable factor in maintaining general medical health of people and fulfilling their psychosocial needs of pain reduction and enhanced cosmetics. In the United States, for the most part, only the middle and upper classes receive non-extraction, restorative, and prosthetic dentistry that is economically within their ability to pay. In addition, uninsured and poverty-level individuals often must face overwhelming long waiting lists, unnecessary referrals, lack of choice, and bureaucratic hurdles when seeking primary dental care. Therefore, it seems pertinent to put forth the question: What are the critical values and beliefs of psychosocial theory that can underscore the practice of dentistry for underserved populations in the United States? The widely employed public health theory, the health belief model (HBM), is applied to evaluate psychosocial factors in dental care for the underserved. The HBM is used to predict and explain behavioral changes in dental health and associated belief patterns. The HBM as applied to dentistry for the underserved predicts self-perceptions of susceptibility and seriousness of dental disease, health status, cues to action, and self-efficacy. Furthermore, patients can make judgments about benefits, costs, and risks of dental treatment. A theoretical approach to dentistry employing the HBM, mediated by values and culture, can provide significant insights into patient thinking, beliefs, and perceptions. These insights can mediate access to and use of primary care dental services by underserved populations. Evidence-based practice (i.e., based on research using the scientific method) has been

A Randomised Controlled Trial of complete denture impression materials

Science.gov (United States)

Hyde, T.P.; Craddock, H.L.; Gray, J.C.; Pavitt, S.H.; Hulme, C.; Godfrey, M.; Fernandez, C.; Navarro-Coy, N.; Dillon, S.; Wright, J.; Brown, S.; Dukanovic, G.; Brunton, P.A.

2014-01-01

Objectives There is continuing demand for non-implant prosthodontic treatment and yet there is a paucity of high quality Randomised Controlled Trial (RCT) evidence for best practice. The aim of this research was to provide evidence for best practice in prosthodontic impressions by comparing two impression materials in a double-blind, randomised, crossover, controlled, clinical trial. Methods Eighty-five patients were recruited, using published eligibility criteria, to the trial at Leeds Dental Institute, UK. Each patient received two sets of dentures; made using either alginate or silicone impressions. Randomisations determined the order of assessment and order of impressions. The primary outcome was patient blinded preference for unadjusted dentures. Secondary outcomes were patient preference for the adjusted dentures, rating of comfort, stability and chewing efficiency, experience of each impression, and an OHIP-EDENT questionnaire. Results Seventy-eight (91.8%) patients completed the primary assessment. 53(67.9%) patients preferred dentures made from silicone impressions while 14(17.9%) preferred alginate impressions. 4(5.1%) patients found both dentures equally satisfactory and 7 (9.0%) found both equally unsatisfactory. There was a 50% difference in preference rates (in favour of silicone) (95%CI 32.7–67.3%, p alginate as their material of choice for secondary impressions for complete dentures. Trial Registration: ISRCTN 01528038.

 This article forms part of a project for which the author (TPH) won the Senior Clinical Unilever Hatton Award of the International Assocation for Dental Research, Capetown, South Africa, June 2014. PMID:24995473

Dentistry and Dental Hygiene Handbook.

Science.gov (United States)

New York State Education Dept., Albany. Office of the Professions.

The handbook contains laws, rules, and regulations of the New York State Education Department that govern dentistry and dental hygiene practice in the state. It describes licensure requirements and includes complete application forms and instructions for obtaining license and first registration as a dentist and dental hygienist. Applicants are…

Recent advances of ultrasound imaging in dentistry--a review of the literature.

Science.gov (United States)

Marotti, Juliana; Heger, Stefan; Tinschert, Joachim; Tortamano, Pedro; Chuembou, Fabrice; Radermacher, Klaus; Wolfart, Stefan

2013-06-01

Ultrasonography as an imaging modality in dentistry has been extensively explored in recent years due to several advantages that diagnostic ultrasound provides. It is a non-invasive, inexpensive, painless method and unlike X-ray, it does not cause harmful ionizing radiation. Ultrasound has a promising future as a diagnostic imaging tool in all specialties in dentistry, for both hard and soft tissue detection. The aim of this review is to provide the scientific community and clinicians with an overview of the most recent advances of ultrasound imaging in dentistry. The use of ultrasound is described and discussed in the fields of dental scanning, caries detection, dental fractures, soft tissue and periapical lesions, maxillofacial fractures, periodontal bony defects, gingival and muscle thickness, temporomandibular disorders, and implant dentistry. Copyright © 2013 Elsevier Inc. All rights reserved.

Valuing Women in Management: An Impression Management Perspective of Gender Diversity.

Science.gov (United States)

Gardner, William L., III; And Others

1994-01-01

Applies a model of impression management to explore the process whereby women in organizations present themselves to others and the impressions they create. Devotes particular attention to how these impressions influence women's experiences in organizations. Suggests future research direction for clarifying the impact of gender impression and…

Nanorobots: Future in dentistry

OpenAIRE

Shetty, Neetha J.; Swati, P.; David, K.

2013-01-01

The purpose of this paper is to review the phenomenon of nanotechnology as it might apply to dentistry as a new field called nanodentistry. Treatment possibilities might include the application of nanotechnology to local anesthesia, dentition renaturalization, the permanent cure for hypersensitivity, complete orthodontic realignment in a single visit, covalently bonded diamondized enamel, and continuous oral health maintenance using mechanical dentifrobots. Dental nanorobots could be construc...

Accuracy of stone casts obtained by different impression materials

Directory of Open Access Journals (Sweden)

Adriana Cláudia Lapria Faria

2008-12-01

Full Text Available Several impression materials are available in the Brazilian marketplace to be used in oral rehabilitation. The aim of this study was to compare the accuracy of different impression materials used for fixed partial dentures following the manufacturers' instructions. A master model representing a partially edentulous mandibular right hemi-arch segment whose teeth were prepared to receive full crowns was used. Custom trays were prepared with auto-polymerizing acrylic resin and impressions were performed with a dental surveyor, standardizing the path of insertion and removal of the tray. Alginate and elastomeric materials were used and stone casts were obtained after the impressions. For the silicones, impression techniques were also compared. To determine the impression materials' accuracy, digital photographs of the master model and of the stone casts were taken and the discrepancies between them were measured. The data were subjected to analysis of variance and Duncan's complementary test. Polyether and addition silicone following the single-phase technique were statistically different from alginate, condensation silicone and addition silicone following the double-mix technique (p .05 to alginate and addition silicone following the double-mix technique, but different from polysulfide. The results led to the conclusion that different impression materials and techniques influenced the stone casts' accuracy in a way that polyether, polysulfide and addition silicone following the single-phase technique were more accurate than the other materials.

A randomised controlled trial of complete denture impression materials.

Science.gov (United States)

Hyde, T P; Craddock, H L; Gray, J C; Pavitt, S H; Hulme, C; Godfrey, M; Fernandez, C; Navarro-Coy, N; Dillon, S; Wright, J; Brown, S; Dukanovic, G; Brunton, P A

2014-08-01

There is continuing demand for non-implant prosthodontic treatment and yet there is a paucity of high quality Randomised Controlled Trial (RCT) evidence for best practice. The aim of this research was to provide evidence for best practice in prosthodontic impressions by comparing two impression materials in a double-blind, randomised, crossover, controlled, clinical trial. Eighty-five patients were recruited, using published eligibility criteria, to the trial at Leeds Dental Institute, UK. Each patient received two sets of dentures; made using either alginate or silicone impressions. Randomisations determined the order of assessment and order of impressions. The primary outcome was patient blinded preference for unadjusted dentures. Secondary outcomes were patient preference for the adjusted dentures, rating of comfort, stability and chewing efficiency, experience of each impression, and an OHIP-EDENT questionnaire. Seventy-eight (91.8%) patients completed the primary assessment. 53(67.9%) patients preferred dentures made from silicone impressions while 14(17.9%) preferred alginate impressions. 4(5.1%) patients found both dentures equally satisfactory and 7 (9.0%) found both equally unsatisfactory. There was a 50% difference in preference rates (in favour of silicone) (95%CI 32.7-67.3%, pUnilever Hatton Award of the International Assocation for Dental Research, Capetown, South Africa, June 2014. Copyright © 2014 The Authors. Published by Elsevier Ltd.. All rights reserved.

Custom sectional impression trays with interlocking type handle for microstomia patients

Directory of Open Access Journals (Sweden)

Fernandes Aquaviva

2009-01-01

Full Text Available Making impressions in microstomia patients is often cumbersome. A modification of standard impression procedure is often necessary while treating such patients. This article describes the fabrication of a custom sectional impression tray with interlocking type of a handle for definitive impression procedures in a microstomia patient.

Over-accumulation of nuclear IGF-1 receptor in tumor cells requires elevated expression of the receptor and the SUMO-conjugating enzyme Ubc9

Energy Technology Data Exchange (ETDEWEB)

Deng, Hua; Lin, Yingbo; Badin, Margherita; Vasilcanu, Daiana; Stroemberg, Thomas [Department of Oncology and Pathology, The Karolinska Institute, Cancer Center Karolinska, SE-17176 Stockholm (Sweden); Jernberg-Wiklund, Helena [Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala (Sweden); Sehat, Bita [Department of Oncology and Pathology, The Karolinska Institute, Cancer Center Karolinska, SE-17176 Stockholm (Sweden); Larsson, Olle, E-mail: olle.larsson@ki.se [Department of Oncology and Pathology, The Karolinska Institute, Cancer Center Karolinska, SE-17176 Stockholm (Sweden)

2011-01-14

Research highlights: {yields} SUMOylation mediates nuclear translocation of IGF-1R which activates transcription. {yields} Here we show that nuclear IGF-1R over-accumulates in tumor cells. {yields} This requires overexpression of the receptor that is a common feature in tumor cells. {yields} An increased expression of the SUMO ligase Ubc9 seems to be an involved mechanism too. -- Abstract: The insulin-like growth factor 1 receptor (IGF-1R) plays crucial roles in tumor cell growth and is overexpressed in many cancers. IGF-1R's trans-membrane kinase signaling pathways have been well characterized. Very recently, we showed that SUMOylation mediates nuclear translocation of the IGF-1R, and that nuclear IGF-1R (nIGF-1R) binds to enhancer regions and activates transcription. We identified three lysine residues in the {beta}-subunit of the receptor and that mutation of these blocks nuclear translocation and gene activation. Furthermore, accumulation of nIGF-1R was proven strongly dependent on the specific SUMO-conjugating enzyme Ubc9. Here we show that nIGF-1R originates solely from the cell membrane and that phosphorylation of the core tyrosine residues of the receptor kinase is crucial for nuclear accumulation. We also compared the levels of nIGF-1R, measured as nuclear/membrane ratios, in tumor and normal cells. We found that the breast cancer cell line MCF-7 has 13-fold higher amounts of nIGF-1R than breast epithelial cells (IME) which showed only a small amount of nIGF-1R. In comparison, the total expression of IGF-1R was only 3.7- higher in MCF-7. Comparison of several other tumor and normal cell lines showed similar tumor cell over-accumulation of nIGF-1R, exceeding the total receptor expression substantially. Ectopic overexpression (>10-fold) of the receptor increased nIGF-1R in IME cells but not to that high level as in wild type MCF-7. The levels of Ubc9 were higher in all tumor cell lines, compared to the normal cells, and this probably contributes to over

Over-accumulation of nuclear IGF-1 receptor in tumor cells requires elevated expression of the receptor and the SUMO-conjugating enzyme Ubc9

International Nuclear Information System (INIS)

Deng, Hua; Lin, Yingbo; Badin, Margherita; Vasilcanu, Daiana; Stroemberg, Thomas; Jernberg-Wiklund, Helena; Sehat, Bita; Larsson, Olle

2011-01-01

Research highlights: → SUMOylation mediates nuclear translocation of IGF-1R which activates transcription. → Here we show that nuclear IGF-1R over-accumulates in tumor cells. → This requires overexpression of the receptor that is a common feature in tumor cells. → An increased expression of the SUMO ligase Ubc9 seems to be an involved mechanism too. -- Abstract: The insulin-like growth factor 1 receptor (IGF-1R) plays crucial roles in tumor cell growth and is overexpressed in many cancers. IGF-1R's trans-membrane kinase signaling pathways have been well characterized. Very recently, we showed that SUMOylation mediates nuclear translocation of the IGF-1R, and that nuclear IGF-1R (nIGF-1R) binds to enhancer regions and activates transcription. We identified three lysine residues in the β-subunit of the receptor and that mutation of these blocks nuclear translocation and gene activation. Furthermore, accumulation of nIGF-1R was proven strongly dependent on the specific SUMO-conjugating enzyme Ubc9. Here we show that nIGF-1R originates solely from the cell membrane and that phosphorylation of the core tyrosine residues of the receptor kinase is crucial for nuclear accumulation. We also compared the levels of nIGF-1R, measured as nuclear/membrane ratios, in tumor and normal cells. We found that the breast cancer cell line MCF-7 has 13-fold higher amounts of nIGF-1R than breast epithelial cells (IME) which showed only a small amount of nIGF-1R. In comparison, the total expression of IGF-1R was only 3.7- higher in MCF-7. Comparison of several other tumor and normal cell lines showed similar tumor cell over-accumulation of nIGF-1R, exceeding the total receptor expression substantially. Ectopic overexpression (>10-fold) of the receptor increased nIGF-1R in IME cells but not to that high level as in wild type MCF-7. The levels of Ubc9 were higher in all tumor cell lines, compared to the normal cells, and this probably contributes to over-accumulation of nIGF-1R

77 FR 9664 - Funds for Leadership Training in Pediatric Dentistry's Current Grantees; One-Year Extension

Science.gov (United States)

2012-02-17

... Leadership Training in Pediatric Dentistry's Current Grantees; One-Year Extension AGENCY: Health Resources... Funds for Leadership Training in Pediatric Dentistry's (T17) Current Grantees. SUMMARY: The Health... for the Leadership Training in Pediatric Dentistry awards to Columbia University, The Regents of the...

Transcutaneous electric nerve stimulation (TENS) in dentistry- A review.

Science.gov (United States)

Kasat, Vikrant; Gupta, Aditi; Ladda, Ruchi; Kathariya, Mitesh; Saluja, Harish; Farooqui, Anjum-Ara

2014-12-01

Transcutaneous electric nerve stimulation (TENS) is a non-pharmacological method which is widely used by medical and paramedical professionals for the management of acute and chronic pain in a variety of conditions. Similarly, it can be utilized for the management of pain during various dental procedures as well as pain due to various conditions affecting maxillofacial region. This review aims to provide an insight into clinical research evidence available for the analgesic and non analgesic uses of TENS in pediatric as well as adult patients related to the field of dentistry. Also, an attempt is made to briefly discuss history of therapeutic electricity, mechanism of action of TENS, components of TENs equipment, types, techniques of administration, advantages and contradictions of TENS. With this we hope to raise awareness among dental fraternity regarding its dental applications thereby increasing its use in dentistry. Key words:Dentistry, pain, TENS.

Application of Calcium Phosphate Materials in Dentistry

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Jabr S. Al-Sanabani

2013-01-01

Full Text Available Calcium phosphate materials are similar to bone in composition and in having bioactive and osteoconductive properties. Calcium phosphate materials in different forms, as cements, composites, and coatings, are used in many medical and dental applications. This paper reviews the applications of these materials in dentistry. It presents a brief history, dental applications, and methods for improving their mechanical properties. Notable research is highlighted regarding (1 application of calcium phosphate into various fields in dentistry; (2 improving mechanical properties of calcium phosphate; (3 biomimetic process and functionally graded materials. This paper deals with most common types of the calcium phosphate materials such as hydroxyapatite and tricalcium phosphate which are currently used in dental and medical fields.

17 CFR 200.61 - Impressions of influence.

Science.gov (United States)

2010-04-01

... 17 Commodity and Securities Exchanges 2 2010-04-01 2010-04-01 false Impressions of influence. 200...; CONDUCT AND ETHICS; AND INFORMATION AND REQUESTS Canons of Ethics § 200.61 Impressions of influence. A... influence him, that any person unduly enjoys his favor or that he is affected in any way by the rank...

Conventional Vs Digital Impressions: Acceptability, Treatment Comfort and Stress Among Young Orthodontic Patients.

Science.gov (United States)

Mangano, Alessandro; Beretta, Matteo; Luongo, Giuseppe; Mangano, Carlo; Mangano, Francesco

2018-01-01

The objective of the present study was to compare patients' acceptability, comfort and stress with conventional and digital impressions. Thirty young orthodontic patients (15 males and 15 females) who had no previous experience of impressions were enrolled in this study. Conventional impressions for orthodontic study models of the dental arches were taken using an alginate impression material (Hydrogum ® , Zhermack Spa, Badia Polesine, Rovigo, Italy). Fifteen days later, digital impressions of both arches were acquired using an intraoral scanner (CS3600 ® , Carestream Dental, Rochester, NY, USA). Immediately after impression taking, patients' acceptability, comfort and stress were measured using two questionnaires and the State anxiety scale. Data showed no difference in terms of anxiety and stress; however, patients preferred the use of digital impressions systems instead of conventional impression techniques. Alginate impressions resulted as fast as digital impressions. Digital impressions resulted the most accepted and comfortable impression technique in young orthodontic patients, when compared to conventional techniques.

Conventional Vs Digital Impressions: Acceptability, Treatment Comfort and Stress Among Young Orthodontic Patients

Science.gov (United States)

Mangano, Alessandro; Beretta, Matteo; Luongo, Giuseppe; Mangano, Carlo; Mangano, Francesco

2018-01-01

Objective: The objective of the present study was to compare patients’ acceptability, comfort and stress with conventional and digital impressions. Materials and Methods: Thirty young orthodontic patients (15 males and 15 females) who had no previous experience of impressions were enrolled in this study. Conventional impressions for orthodontic study models of the dental arches were taken using an alginate impression material (Hydrogum®, Zhermack Spa, Badia Polesine, Rovigo, Italy). Fifteen days later, digital impressions of both arches were acquired using an intraoral scanner (CS3600®, Carestream Dental, Rochester, NY, USA). Immediately after impression taking, patients’ acceptability, comfort and stress were measured using two questionnaires and the State anxiety scale. Results: Data showed no difference in terms of anxiety and stress; however, patients preferred the use of digital impressions systems instead of conventional impression techniques. Alginate impressions resulted as fast as digital impressions. Conclusions: Digital impressions resulted the most accepted and comfortable impression technique in young orthodontic patients, when compared to conventional techniques. PMID:29492177

YouTube, dentistry, and dental education.

Science.gov (United States)

Knösel, Michael; Jung, Klaus; Bleckmann, Annalen

2011-12-01

The objective of this study was to systematically assess the informational value, intention, source, and bias of videos related to dentistry available on the video-sharing Internet platform YouTube. YouTube (www.youtube.com) was searched for videos related to dentistry, using the system-generated sorts "by relevance" and "most viewed" and two categories (All and Education). Each of the first thirty results was rated by two assessors filling out a questionnaire for each (total: 120). The data were subjected to statistical analysis using Cohen's kappa, Pearson's correlation coefficient tau, Mann-Whitney U-tests, and a nonparametric three-way ANOVA, including an analysis of the interaction between the sorting and category effect, with an α-level of 5 percent. The scan produced 279,000 results in the category All and 5,050 in the category Education. The analysis revealed a wide variety of information about dentistry available on YouTube. The purpose of these videos includes entertainment, advertising, and education. The videos classified under Education have a higher degree of usefulness and informational value for laypersons, dental students, and dental professionals than those found in a broader search category. YouTube and similar social media websites offer new educational possibilities that are currently both underdeveloped and underestimated in terms of their potential value. Dentists and dental educators should also recognize the importance of these websites in shaping public opinion about their profession.

Ethics and marketing in esthetic dentistry

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Obradović-Đuričić Kosovka

2017-01-01

Full Text Available Contemporary dentistry is, first of all, characterized by diverse accelerated development, owing to improvements of information and other technologies, as well as the development of dental materials (shape-memory biomaterials, nanomaterials, biomaterials for application in tissue engineering, etc.. Expert doctrinaire attitudes move from the direction of operative interventions, whereby disease and acute symptoms are primarily treated, towards the strengthening of oral health by minimally invasive procedures. A particular place in patients’ total rehabilitation belongs to numerous esthetic procedures which, to a large extent, make up a wants-based service, led by the patients’ needs and affinities. This paper deals with differences between cosmetic and esthetic dentistry. The complexity of esthetic dentistry, which favors therapy with the change of function parameters in care for the patient, is emphasized. On the other hand, more attention is paid to the need to know and respect ethical and marketing principles that follow any activity of dentists, starting from the first contact with the patient, the selection of certified materials, to the implementation of the appropriate treatment plan. Well-directed communication and comprehensive awareness of the patient, the use of the visual analog scale, consideration of realistic resources in therapy, and the acceptance of de Bono model of adopted parallel thinking are determinants which help dentists define a problem adequately, find quality solutions, open alternative solutions, and reduce the potential risks in patients’ therapy.

The application of CAD / CAM technology in Dentistry

Science.gov (United States)

Susic, I.; Travar, M.; Susic, M.

2017-05-01

Information and communication technologies have found their application in the healthcare sector, including the frameworks of modern dentistry. CAD / CAM application in dentistry is the process by which is attained finished dental restoration through fine milling process of ready ceramic blocks. CAD / CAM is an acronym of english words Computer-Aided-Design (CAD) / Computer-Aided-Manufacture (CAM), respectively dental computer aided design and computer aided manufacture of inlays, onlays, crowns and bridges. CAD / CAM technology essentially allows you to create a two-dimensional and three-dimensional models and their materialization by numerical controlled machines. In order to operate more efficiently, reduce costs, increase user/patient satisfaction and ultimately achieve profits, many dental offices in the world have their attention focused on implementation of modern IT solutions in everyday practice. In addition to the specialized clinic management software, inventory control, etc., or hardware such as the use of lasers in cosmetic dentistry or intraoral scanning, recently the importance is given to the application of CAD / CAM technology in the field of prosthetic. After the removal of pathologically altered tooth structure, it is necessary to achieve restoration that will be most similar to the anatomy of a natural tooth. Applying CAD / CAM technology on applicable ceramic blocks it can be obtained very quick, but also very accurate restoration, in the forms of inlays, onlays, bridges and crowns. The paper presents the advantages of using this technology as well as satisfaction of the patients and dentists by using systems as: Cercon, Celay, Cerec, Lava, Everest, which represent imperative of modern dentistry in creating fixed dental restorations.

Eco-friendly dentistry: Need of future. An overview

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Savy Arora

2017-01-01

Full Text Available In today's world, it is very necessary to understand the importance of being eco-friendly in every facet of our lives. The color “green” has healing power and denotes renewal, growth, and hope. “Eco-friendly dentistry” attempts to reduce the detrimental impact of dental practices on the environment and promote environmental awareness and sustainability to patients. This paper attempts to cover all possible aspects of making a dental practice eco-friendly, both in a dental perspective as well as a general perspective. While establishing an eco-friendly dental workplace, the dentist needs to assess his choices in planning the infrastructure and purchasing of equipment and dental materials. Eco-friendly dentistry is a newly evolving practice of dentistry, which encompasses a simultaneous devotion to sustainability, prevention, precaution, and a minimally invasive patient-centric, as well as global-centric treatment. There are two main avenues for implementing eco-friendly dentistry: (1 appropriate policy development and implementation and (2 dentists taking responsibility/ownership in the absence of policies and regulations. Although in some cases, it may take a little extra effort or money; dentists throughout the world are doing their best to reduce the environmental impact of the dental practice. Although the commitment of one small dental office cannot save the planet, certainly, the collective efforts of many small offices as well as large dental hospitals/colleges can ensure that dentists, at least, will not be responsible for destroying it. This article discusses various factors that can be incorporated into dental practice that can help make dentistry eco-friendly.

Investigation of The Omaha System for dentistry.

Science.gov (United States)

Jurkovich, M W; Ophaug, M; Salberg, S; Monsen, K

2014-01-01

Today, dentists and hygienists have inadequate tools to identify contributing factors to dental disease, diagnosis of disease or to document outcomes in a standardized and machine readable format. Increasing demand to find the most effective care methodologies make the development of further terminologies for dentistry more urgent. Preventive care is the focus of early efforts to define best practices. We reviewed one possibility with a history of public health documentation that might assist in these early efforts at identifying best practices. This paper examines, through a survey of dentists, the Omaha System Problem Classification Scheme. The survey requested that dentists rate the usefulness of knowing about specific signs and symptoms for each of the 42 problems within the Problem list of the Omaha System. Using a weighted scoring system, 22 of the 42 problems received over 50% of the possible maximum score and 30 of the 42 problems received at least 25% of the possible points. These findings suggests that further evaluation of The Omaha System, may be useful to dentistry. At a minimum, the survey provides additional information about non-physiological problems, signs, and symptoms that may be appropriate for documentation purposes within an electronic health record (EHR) used in dentistry.

The fungicidal effect of ultraviolet light on impression materials

International Nuclear Information System (INIS)

Ishida, H.; Nahara, Y.; Tamamoto, M.; Hamada, T.

1991-01-01

The effects of ultraviolet (UV) light on fungi and impression materials were tested. UV light (250 microW/cm2) killed most Candida organisms (10(3) cells/ml) within 5 minutes. UV light (8000 microW/cm2) killed most C. albicans (10(7) cells/ml) within 2 minutes of exposure. The effect of UV light on dimensional change and surface roughness of impression materials (irreversible hydrocolloid, agar, and silicone rubber) was tested. The results showed that neither dimensional change nor surface roughness of the impression materials were affected. The results of this study indicate that UV light disinfects impression materials that are contaminated with Candida organisms

The effect of a change in selection procedures on students' motivation to study dentistry.

Science.gov (United States)

Gardner, S P; Roberts-Thomson, K F

2014-03-01

The aim of this study was to determine whether changes in student selection criteria at The University of Adelaide effected a change in motivation and influencing factors to study dentistry by comparing cohorts. Online questionnaire completed by first-year dentistry students at The University of Adelaide between 1993-1996 and 1997-2005. All 666 students completed the questionnaire with 647 suitable for analysis. The likelihood of students being motivated for a career in dentistry because it 'fits with family' was greater for the 1997-2005 cohort (OR = 1.68, 95% CI = 1.14-2.49, p dentistry. © 2014 Australian Dental Association.

Accuracy of Referring Provider and Endoscopist Impressions of Colonoscopy Indication.

Science.gov (United States)

Naveed, Mariam; Clary, Meredith; Ahn, Chul; Kubiliun, Nisa; Agrawal, Deepak; Cryer, Byron; Murphy, Caitlin; Singal, Amit G

2017-07-01

Background: Referring provider and endoscopist impressions of colonoscopy indication are used for clinical care, reimbursement, and quality reporting decisions; however, the accuracy of these impressions is unknown. This study assessed the sensitivity, specificity, positive and negative predictive value, and overall accuracy of methods to classify colonoscopy indication, including referring provider impression, endoscopist impression, and administrative algorithm compared with gold standard chart review. Methods: We randomly sampled 400 patients undergoing a colonoscopy at a Veterans Affairs health system between January 2010 and December 2010. Referring provider and endoscopist impressions of colonoscopy indication were compared with gold-standard chart review. Indications were classified into 4 mutually exclusive categories: diagnostic, surveillance, high-risk screening, or average-risk screening. Results: Of 400 colonoscopies, 26% were performed for average-risk screening, 7% for high-risk screening, 26% for surveillance, and 41% for diagnostic indications. Accuracy of referring provider and endoscopist impressions of colonoscopy indication were 87% and 84%, respectively, which were significantly higher than that of the administrative algorithm (45%; P 90%) for determining screening (vs nonscreening) indication, but specificity of the administrative algorithm was lower (40.3%) compared with referring provider (93.7%) and endoscopist (84.0%) impressions. Accuracy of endoscopist, but not referring provider, impression was lower in patients with a family history of colon cancer than in those without (65% vs 84%; P =.001). Conclusions: Referring provider and endoscopist impressions of colonoscopy indication are both accurate and may be useful data to incorporate into algorithms classifying colonoscopy indication. Copyright © 2017 by the National Comprehensive Cancer Network.

Inherent variation in multiple shoe-sole test impressions.

Science.gov (United States)

Shor, Yaron; Wiesner, Sarena; Tsach, Tsadok; Gurel, Ron; Yekutieli, Yoram

2018-04-01

Shoeprints left at crime scenes are seldom perfect. Many prints are distorted or contaminated by various materials. Noisy background often contributes to vagueness on the shoeprints as well. Test impressions made from the suspect's shoes in the laboratory are considered a genuine replication of the shoe-sole. This naïve attitude is far from being correct. Consecutive test impressions made in the laboratory under strict similar conditions revealed differences among the exemplars of the same sole. Some of them are minor, but some are major, and can mislead the less experienced practitioners during the comparison process. This article focuses on the inherent within source variability between controlled shoeprints made from the same shoe, as it appears on the RACs. To describe and analyze this variability, repeated test impressions were prepared, and datasets were created. Several RACs were marked on each test impression, using an expert assisting software tool (developed in the authors' lab). The variance in repeated test impressions is demonstrated and possible sources are discussed. This variance should be considered when trying to establish the degree of matching between individual characteristics. Copyright © 2017. Published by Elsevier B.V.

Electronic evaluation for video commercials by impression index.

Science.gov (United States)

Kong, Wanzeng; Zhao, Xinxin; Hu, Sanqing; Vecchiato, Giovanni; Babiloni, Fabio

2013-12-01

How to evaluate the effect of commercials is significantly important in neuromarketing. In this paper, we proposed an electronic way to evaluate the influence of video commercials on consumers by impression index. The impression index combines both the memorization and attention index during consumers observing video commercials by tracking the EEG activity. It extracts features from scalp EEG to evaluate the effectiveness of video commercials in terms of time-frequency-space domain. And, the general global field power was used as an impression index for evaluation of video commercial scenes as time series. Results of experiment demonstrate that the proposed approach is able to track variations of the cerebral activity related to cognitive task such as observing video commercials, and help to judge whether the scene in video commercials is impressive or not by EEG signals.

Paediatric conscious sedation: views and experience of specialists in paediatric dentistry.

Science.gov (United States)

Woolley, S M; Hingston, E J; Shah, J; Chadwick, B L

2009-09-26

The objectives were three-fold: to investigate the level of conscious sedation training received prior to and during specialist training in paediatric dentistry; to establish the use of conscious sedation during and following specialisation; and to determine the attitudes of specialists in paediatric dentistry to conscious sedation. A self-administered postal questionnaire was sent to all specialists in paediatric dentistry registered with the General Dental Council in January 2008. Non-responders were contacted again after a four-week period. A response rate of 60% was achieved. Of the 122 respondents, 67 (55%) had received sedation training as an undergraduate; 89 (75%) had been trained during specialisation. All respondents performed dental treatment under sedation as a trainee and the majority used nitrous oxide inhalation sedation (NOIS). Over 90% of respondents felt that NOIS should be available to all children, both in appropriate primary care settings and in hospitals. One hundred and twenty-one (99%) respondents thought that all trainees in paediatric dentistry should have sedation training. The most popular form of sedation amongst specialists in paediatric dentistry was NOIS. However, some of the respondents felt that children should have access to other forms of sedation in both the primary care and hospital settings. Additional research on other forms of sedation is required to evaluate their effectiveness and safety.

The Intraoral Ultrasonography in Dentistry

African Journals Online (AJOL)

2016-06-03

Jun 3, 2016 ... mucosa, the tongue, periodontal tissues, and periapical lesions. The main purpose ... in dentistry were reported in 1963 by Baum et al.[2]. Ultrasound is the .... in most cases, is not easily detected if it is depressed when placing the ..... changes of patients with chronic renal failure by CBCT. Dentomaxillofac ...

In vivo precision of conventional and digital methods for obtaining quadrant dental impressions.

Science.gov (United States)

Ender, Andreas; Zimmermann, Moritz; Attin, Thomas; Mehl, Albert

2016-09-01

Quadrant impressions are commonly used as alternative to full-arch impressions. Digital impression systems provide the ability to take these impressions very quickly; however, few studies have investigated the accuracy of the technique in vivo. The aim of this study is to assess the precision of digital quadrant impressions in vivo in comparison to conventional impression techniques. Impressions were obtained via two conventional (metal full-arch tray, CI, and triple tray, T-Tray) and seven digital impression systems (Lava True Definition Scanner, T-Def; Lava Chairside Oral Scanner, COS; Cadent iTero, ITE; 3Shape Trios, TRI; 3Shape Trios Color, TRC; CEREC Bluecam, Software 4.0, BC4.0; CEREC Bluecam, Software 4.2, BC4.2; and CEREC Omnicam, OC). Impressions were taken three times for each of five subjects (n = 15). The impressions were then superimposed within the test groups. Differences from model surfaces were measured using a normal surface distance method. Precision was calculated using the Perc90_10 value. The values for all test groups were statistically compared. The precision ranged from 18.8 (CI) to 58.5 μm (T-Tray), with the highest precision in the CI, T-Def, BC4.0, TRC, and TRI groups. The deviation pattern varied distinctly depending on the impression method. Impression systems with single-shot capture exhibited greater deviations at the tooth surface whereas high-frame rate impression systems differed more in gingival areas. Triple tray impressions displayed higher local deviation at the occlusal contact areas of upper and lower jaw. Digital quadrant impression methods achieve a level of precision, comparable to conventional impression techniques. However, there are significant differences in terms of absolute values and deviation pattern. With all tested digital impression systems, time efficient capturing of quadrant impressions is possible. The clinical precision of digital quadrant impression models is sufficient to cover a broad variety of

Restorative dentistry for children.

Science.gov (United States)

Donly, Kevin J

2013-01-01

This article discusses contemporary pediatric restorative dentistry. Indications and contraindications for the choice of different restorative materials in different clinical situations, including the risk assessment of the patient, are presented. The specific use of glass ionomer cement or resin-modified glass ionomer cement, resin-based composite, and stainless steel crowns is discussed so that preparation design and restoration placement is understood. Copyright © 2013 Elsevier Inc. All rights reserved.

Comparison of intraoral scanning and conventional impression techniques using 3-dimensional superimposition.

Science.gov (United States)

Rhee, Ye-Kyu; Huh, Yoon-Hyuk; Cho, Lee-Ra; Park, Chan-Jin

2015-12-01

The aim of this study is to evaluate the appropriate impression technique by analyzing the superimposition of 3D digital model for evaluating accuracy of conventional impression technique and digital impression. Twenty-four patients who had no periodontitis or temporomandibular joint disease were selected for analysis. As a reference model, digital impressions with a digital impression system were performed. As a test models, for conventional impression dual-arch and full-arch, impression techniques utilizing addition type polyvinylsiloxane for fabrication of cast were applied. 3D laser scanner is used for scanning the cast. Each 3 pairs for 25 STL datasets were imported into the inspection software. The three-dimensional differences were illustrated in a color-coded map. For three-dimensional quantitative analysis, 4 specified contact locations(buccal and lingual cusps of second premolar and molar) were established. For twodimensional quantitative analysis, the sectioning from buccal cusp to lingual cusp of second premolar and molar were acquired depending on the tooth axis. In color-coded map, the biggest difference between intraoral scanning and dual-arch impression was seen (Pimpression and the smallest difference was seen between dual-arch and full-arch impression. The two- and three-dimensional deviations between intraoral scanner and dual-arch impression was bigger than full-arch and dual-arch impression (P.05).

In vivo precision of conventional and digital methods for obtaining quadrant dental impressions

OpenAIRE

Ender, Andreas; Zimmermann, Moritz; Attin, Thomas; Mehl, Albert

2016-01-01

OBJECTIVES Quadrant impressions are commonly used as alternative to full-arch impressions. Digital impression systems provide the ability to take these impressions very quickly; however, few studies have investigated the accuracy of the technique in vivo. The aim of this study is to assess the precision of digital quadrant impressions in vivo in comparison to conventional impression techniques. MATERIALS AND METHODS Impressions were obtained via two conventional (metal full-arch tray, CI, ...

Accuracy of Different Implant Impression Techniques: Evaluation of New Tray Design Concept.

Science.gov (United States)

Liu, David Yu; Cader, Fathima Nashmie; Abduo, Jaafar; Palamara, Joseph

2017-12-29

To evaluate implant impression accuracy with a new tray design concept in comparison to nonsplinted and splinted impression techniques for a 2-implant situation. A reference bar titanium framework was fabricated to fit on 2 parallel implants. The framework was used to generate a resin master model with 2 implants that fit precisely against the framework. Three impression techniques were evaluated: (1) nonsplinted, (2) splinted, and (3) nonsplinted with modified tray impressions. All the trays were fabricated from light-cured acrylic resin material with openings that corresponded to the implant impression copings. Ten impressions were taken for each technique using poly(vinyl siloxane) impression material. The impressions were poured with type IV dental stone to generate the test casts. A rosette strain gauge was bonded to the middle of the framework. As the framework retaining screws were tightened on each test cast, the developed strains were recorded until the completion of the tightening to 35 Ncm. The generated strains of the rosette strain gauge were used to calculate the maximum principal strain. A statistically significant difference was observed among the different impression techniques. The modified tray design impression technique was associated with the least framework strains, which indicates greater accuracy compared with the other techniques. There was no significant difference between the splinted and the nonsplinted impression techniques. The new tray design concept appeared to produce more accurate implant impressions than the other techniques. Despite the statistical difference among the impression techniques, the clinical significance of this difference is yet to be determined. © 2017 by the American College of Prosthodontists.

[Impression Formation in the Diagnosis and Treatment of Mental Disorders].

Science.gov (United States)

Linden, Michael; Dymke, Tina; Hüttner, Susanne; Schnaubelt, Sabine

2016-06-01

The first item of any psychopathological assessment is "general impression". There is some research under the heading of "impression formation" which shows that the outer appearance of a person decides about how a person is perceived by others and how others react. Impression formation is an important factor in social interaction. This is of special importance in mental disorders, which may express themselves in a distorted impression formation. As impression formation is by and large an emotional process, measurement can be done by adjective lists. An example is the bipolar MED rating scale. Such lists can be used in therapy to help patients and therapists to understand the problem and initiate modifications. A special group intervention in occupational therapy is described. Results suggest that impression formation is quite objective, that self- and observer judgments coincide and that therapy can help to adopt a less irritating outer appearance. © Georg Thieme Verlag KG Stuttgart · New York.

Virtual First Impressions

Science.gov (United States)

Bergren, Martha Dewey

2005-01-01

Frequently, a nurse's first and only contact with a graduate school, legislator, public health official, professional organization, or school nursing colleague is made through e-mail. The format, the content, and the appearance of the e-mail create a virtual first impression. Nurses can manage their image and the image of the profession by…

Black triangle dilemma and its management in esthetic dentistry.

Science.gov (United States)

Singh, Vijendra P; Uppoor, Ashita S; Nayak, Dilip G; Shah, Dipen

2013-05-01

In recent years, clinician and dentist's esthetic demand in dentistry have increased rapidly, driven by an enhanced awareness of beauty and esthetics. The ultimate goal in modern restorative dentistry is to achieve "white" and "pink" esthetics in esthetically important zones. "White esthetics" is the natural dentition or the restoration of dental hard tissues with suitable materials. "Pink esthetics" refers to the surrounding soft-tissues, which includes the interdental papilla and gingiva that can enhance or diminish the esthetic result. Reconstruction of the lost interdental papilla is one of the most challenging and least predictable problems. Restoration and maintenance of these tissues with adequate surgical and prosthetic techniques are a real challenge in modern esthetic dentistry. Treatment of marginal tissue recession, excessive gingival display, deficient ridges, ridge collapse, and esthetic defects around teeth and implants are some of the esthetic problems associated with the interdental papilla that have to be corrected in todays scenario which has been discussed in this review.

The Comparison of Iranian and Foreign Students’ Motivations to Choose Dentistry Field of Study

Directory of Open Access Journals (Sweden)

Abdolreza Gilavand

2016-06-01

Full Text Available Background Because of some special and privileged attractions of dentistry discipline, the first choice of volunteers who want to enter university is dentistry. The students usually choose it regardless to their interests and talents. Therefore, this study aimed to investigate Iranian and Foreign student’s motivations to choose dentistry field of study. Materials and Methods We searched international databases such as PubMed, Scopus, EMBASE, Cochrane Library, and Iranian databases such as SID, Magiran, Iranmedex using a searching strategy during 2000 to 2015 years. Database without language restriction, since 2000 sources, with the MeSH term "Choose dentistry field" AND "Students". At first, in the initial search,152 articles were found, and finally, 51 of them which were related to the subject of this research were used. Results In general, the motivation of students to choose field of study in Iranain and Foreign students include the following:: an independent office or job independence, high economic income, appropriate social status,  job attractiveness of dentistry, appropriate job position, individual longing, help others, top rank of student in the university entrance exam, continue to study at specialized PhD in one of dentistry trends, successful marriage nd interest in the field of dentistry. Conclusion It seems that with regard to the high unemployment rate of university graduates in Iran, the most important incentives of applicants who want to enter the dentistry discipline are high income and  particular social prestige at this major. Moreover, high income and independent job situations are the most important factors in Foreign students for choosing this filed of study in the overseas studies.

The quality of impressions for crowns and bridges: an assessment of the work received at three commercial dental laboratories. assessing the quality of the impressions of prepared teeth.

Science.gov (United States)

Storey, D; Coward, T J

2013-06-01

The literature is limited in studies directly assessing the quality of impressions for crowns and bridges in the UK. The aim of the study was to assess the quality of impressions for conventional crown and bridgework received by commercial dental laboratories. Three dental laboratories were visited over a 3-month period. All impressions for conventional crowns and bridges that arrived on the days of the visits were examined prior to any laboratory processing. A total of 206 impression cases were examined and assessed against criteria laid out in a custom-designed assessment form. Defects were commonly found in the recording of prepared teeth. Overall, 44.2% of impression cases were unsatisfactory. NHS impressions were more than twice as likely to be unsatisfactory compared to private impressions. If the results of this survey are typical then the general quality of impressions for fixed crown and bridgework is unacceptable. This is particularly true for work completed under the NHS contract.

IMPRESS Integrated Project-An overview paper

International Nuclear Information System (INIS)

Jarvis, D.J.; Voss, D.

2005-01-01

IMPRESS is an acronym for Intermetallic Materials Processing in Relation to Earth and Space Solidification. This project was selected by the European Commission and recently started in November 2004. The main scientific objective of IMPRESS is to gain a better understanding of the links between materials processing routes, structure and final properties of intermetallic alloys. Technically speaking, the project aims to develop and test two distinct prototypes based on intermetallic materials, namely gas turbine blades and Raney-type catalytic powder. Numerous material processing routes are being explored within the project with a strong emphasis on solidification. For turbine blade manufacturing, the principal processes under study are tilt casting, counter-gravity casting and centrifugal casting. For catalytic powder production, the focus is placed on gas atomisation and vapour condensation processes. IMPRESS combines a wide range of fundamental studies of solidification both on ground and in space, as well as industrial process development. This paper will describe some of the different facets related to solidification

[Prevalence of dental diseases among Moscow students and need of dentistry].

Science.gov (United States)

Makeeva, I M; Doroshina, V Iu; Protsenko, A S

2009-01-01

A clinical epidemiologic study was made among 432 Moscow students and as a part of it was found the high prevalence rate of pathologies of dentition and variety of nosologic forms. The most common cases were: caries, periodontal disease, deformity and anomalies of tooth position. These findings were necessary to estimate the need of all types of dentistry for Moscow students. It was specified that 43% of students were in need of filling and dental restoration, 35% were in need of crowns of tooth, 22% were in need of dental restoration by means of orthopedic constructions. Endodontic dentistry was necessary for 31% of students, surgical removal - for 8%, periodontal dentistry - for 37%.

Accuracy of five implant impression technique: effect of splinting materials and methods

Science.gov (United States)

Cho, Sung-Bum

2011-01-01

PURPOSE The aim of this study was to evaluate the effect of dimensional stability of splinting material on the accuracy of master casts. MATERIALS AND METHODS A stainless steel metal model with 6 implants embedded was used as a master model. Implant level impressions were made after square impression copings were splinted using 5 different techniques as follows. (1) Splinted with autopolymerizing resin and sectioned, reconnected to compensate polymerization shrinkage before the impression procedure. (2) Splinted with autopolymerizing resin just before impression procedure. (3) Primary impression made with impression plaster and secondary impression were made over with polyether impression material. (4) Splinted with impression plaster. (5) Splinted with VPS bite registration material. From master model, 5 impressions and 5 experimental casts, total 25 casts were made for each of 5 splinting methods. The distortion values of each splinting methods were measured using coordinate measuring machine, capable of recordings in the x-, y-, z-axes. A one-way analysis of variance (ANOVA) at a confidence level of 95% was used to evaluate the data and Tukey's studentized range test was used to determine significant differences between the groups. RESULTS Group 1 showed best accuracy followed by Group 3 & 4. Group 2 and 5 showed relatively larger distortion value than other groups. No significant difference was found between group 3, 4, 5 in x-axis, group 2, 3, 4 in y-axis and group 1, 3, 4, 5 in z-axis (Pimpression copings with autopolymerizing resin following compensation of polymerization shrinkage and splinting method with impression plaster can enhance the accuracy of master cast and impression plaster can be used simple and effective splinting material for implant impression procedure. PMID:22259700

Perceived competency towards preventive dentistry among dental graduates: the need for curriculum change.

Science.gov (United States)

Arheiam, Arheiam; Bankia, Ibtesam; Ingafou, Mohamed

2015-01-01

A previous study has shown that dental practitioners in Benghazi believed that the less prevention-oriented education system is one of the barriers to applying preventive dentistry. To assess attitudes and perceived competence of the dental graduates in Benghazi towards prevention and early management of dental caries. A cross-sectional, questionnaire-based survey was conducted among internship students attending the Department of Community and Preventive Dentistry in Faculty of Dentistry, Benghazi, Libya. The participants were asked to provide demographic information, to respond to statements about their attitudes towards preventive dentistry, and to answer questions regarding their perceived competence in applying preventive dentistry procedures. Data from 108 Libyan dental graduates were analysed for this study, of which 64% of them were females and 42.1% of them passed their final year with grade: acceptable. The most acknowledged aspects of preventive dentistry were being useful and essential to the community (95.4 and 90.8%, respectively). The percentage of participants expressing a proficiency in providing oral hygiene instructions was the highest (95.4%). There were differences between study subgroups in their perceived competence of preventive dental practices by gender and academic performance (p≤0.05). This study highlighted that the currently implemented undergraduate education programme in Benghazi dental school does not provide dentists with the required attitude and skills to fulfil their role in providing preventive-oriented health services.

Comparison of intraoral scanning and conventional impression techniques using 3-dimensional superimposition

Science.gov (United States)

Rhee, Ye-Kyu

2015-01-01

PURPOSE The aim of this study is to evaluate the appropriate impression technique by analyzing the superimposition of 3D digital model for evaluating accuracy of conventional impression technique and digital impression. MATERIALS AND METHODS Twenty-four patients who had no periodontitis or temporomandibular joint disease were selected for analysis. As a reference model, digital impressions with a digital impression system were performed. As a test models, for conventional impression dual-arch and full-arch, impression techniques utilizing addition type polyvinylsiloxane for fabrication of cast were applied. 3D laser scanner is used for scanning the cast. Each 3 pairs for 25 STL datasets were imported into the inspection software. The three-dimensional differences were illustrated in a color-coded map. For three-dimensional quantitative analysis, 4 specified contact locations(buccal and lingual cusps of second premolar and molar) were established. For twodimensional quantitative analysis, the sectioning from buccal cusp to lingual cusp of second premolar and molar were acquired depending on the tooth axis. RESULTS In color-coded map, the biggest difference between intraoral scanning and dual-arch impression was seen (Pimpression and the smallest difference was seen between dual-arch and full-arch impression. CONCLUSION The two- and three-dimensional deviations between intraoral scanner and dual-arch impression was bigger than full-arch and dual-arch impression (P.05). PMID:26816576

Digital vs. conventional full-arch implant impressions: a comparative study.

Science.gov (United States)

Amin, Sarah; Weber, Hans Peter; Finkelman, Matthew; El Rafie, Khaled; Kudara, Yukio; Papaspyridakos, Panos

2017-11-01

To test whether or not digital full-arch implant impressions with two different intra-oral scanners (CEREC Omnicam and True Definition) have the same accuracy as conventional ones. The hypothesis was that the splinted open-tray impressions would be more accurate than digital full-arch impressions. A stone master cast representing an edentulous mandible using five internal connection implant analogs (Straumann Bone Level RC, Basel, Switzerland) was fabricated. The three median implants were parallel to each other, the far left implant had 10°, and the far right had 15° distal angulation. A splinted open-tray technique was used for the conventional polyether impressions (n = 10) for Group 1. Digital impressions (n = 10) were taken with two intra-oral optical scanners (CEREC Omnicam and 3M True Definition) after connecting polymer scan bodies to the master cast for groups 2 and 3. Master cast and conventional impression test casts were digitized with a high-resolution reference scanner (Activity 880 scanner; Smart Optics, Bochum, Germany) to obtain digital files. Standard tessellation language (STL) datasets from the three test groups of digital and conventional impressions were superimposed with the STL dataset from the master cast to assess the 3D deviations. Deviations were recorded as root-mean-square error. To compare the master cast with conventional and digital impressions at the implant level, Welch's F-test was used together with Games-Howell post hoc test. Group I had a mean value of 167.93 μm (SD 50.37); Group II (Omnicam) had a mean value of 46.41 μm (SD 7.34); Group III (True Definition) had a mean value of 19.32 μm (SD 2.77). Welch's F-test was used together with the Games-Howell test for post hoc comparisons. Welch's F-test showed a significant difference between the groups (P digital implant impressions using True Definition scanner and Omnicam were significantly more accurate than the conventional impressions with the splinted open

Possibilities and problems of modern dosimetry techniques in dentistry

International Nuclear Information System (INIS)

Regulla, D.F.

Basic requirement for an optimized application of radiation in dentistry is a qualified dosimetry. The paper introduces into new dosimetry techniques based on solid state phenomena, such as luminescence an exoelectron emission, which, in case of dentistry, appear superior to conventional methods such as film and ionization chamber dosimetry. Advantages of the TLDs dosimeters, such as miniature detector volume, dynamic detection range, tissue equivalence etc., and their dosimetric possibilities are described together with hints on operational problems with respect to achieving high dosimetric measurement accuracy. (orig.) [de

Computer-Based Technologies in Dentistry: Types and Applications

Directory of Open Access Journals (Sweden)

Rajaa Mahdi Musawi

2016-10-01

Full Text Available During dental education, dental students learn how to examine patients, make diagnosis, plan treatment and perform dental procedures perfectly and efficiently. However, progresses in computer-based technologies including virtual reality (VR simulators, augmented reality (AR and computer aided design/computer aided manufacturing (CAD/CAM systems have resulted in new modalities for instruction and practice of dentistry. Virtual reality dental simulators enable repeated, objective and assessable practice in various controlled situations. Superimposition of three-dimensional (3D virtual images on actual images in AR allows surgeons to simultaneously visualize the surgical site and superimpose informative 3D images of invisible regions on the surgical site to serve as a guide. The use of CAD/CAM systems for designing and manufacturing of dental appliances and prostheses has been well established.This article reviews computer-based technologies, their application in dentistry and their potentials and limitations in promoting dental education, training and practice. Practitioners will be able to choose from a broader spectrum of options in their field of practice by becoming familiar with new modalities of training and practice.Keywords: Virtual Reality Exposure Therapy; Immersion; Computer-Aided Design; Dentistry; Education

Dental impression technique using optoelectronic devices

Science.gov (United States)

Sinescu, Cosmin; Barua, Souman; Topala, Florin Ionel; Negrutiu, Meda Lavinia; Duma, Virgil-Florin; Gabor, Alin Gabriel; Zaharia, Cristian; Bradu, Adrian; Podoleanu, Adrian G.

2018-03-01

INTRODUCTION: The use of Optical Coherence Tomography (OCT) as a non-invasive and high precision quantitative information providing tool has been well established by researches within the last decade. The marginal discrepancy values can be scrutinized in optical biopsy made in three dimensional (3D) micro millimetre scale and reveal detailed qualitative and quantitative information of soft and hard tissues. OCT-based high resolution 3D images can provide a significant impact on finding recurrent caries, restorative failure, analysing the precision of crown preparation, and prosthetic elements marginal adaptation error with the gingiva and dental hard tissues. During the CAD/CAM process of prosthodontic restorations, the circumvent of any error is important for the practitioner and the technician to reduce waste of time and material. Additionally, OCT images help to achieve a new or semi-skilled practitioner to analyse their crown preparation works and help to develop their skills faster than in a conventional way. The aim of this study is to highlight the advantages of OCT in high precision prosthodontic restorations. MATERIALS AND METHODS: 25 preparations of frontal and lateral teeth were performed for 7 different patients. The impressions of the prosthetic fields were obtained both using a conventional optoelectronic system (Apolo Di, Syrona) and a Spectral Domain using OCT (Dental prototype, working at 860 nm). For the conventional impression technique the preparation margins were been prelevated by gingival impregnated cords. No specific treatments were performed by the OCT impression technique. RESULTS: The scanning performed by conventional optoelectronic system proved to be quick and accurate in terms of impression technology. The results were represented by 3D virtual models obtained after the scanning procedure was completed. In order to obtain a good optical impression a gingival retraction cord was inserted between the prepared tooth and the gingival

Effects of Lighting Direction on the Impression of Faces and Objects and the Role of Gaze Direction in the Impression-Forming

Directory of Open Access Journals (Sweden)

Keiichi Horibata

2011-10-01

Full Text Available We examined whether lighting direction, left or right, has an influence on the impression of faces and objects, and the role of gaze direction in the impression-forming. In the first experiment, we examined how lighting directions influenced the impression of faces and objects. On each trial, a pair of faces or objects was presented on top of each other. Left side was brighter in one and right side was brighter in the other. The participants were asked to answer which face or object was more preferable. The results showed that the participants preferred left-brighter faces and objects significantly more frequently than right-brighter stimuli (p < .05, chi-square test. The effect was especially strong in the upright faces. The results suggested that faces and objects give better impressions when they are lit from the left. In the second experiment, we examined whether eye-movement would play a role in our preference for left-brighter faces and objects. We recorded eye-movements of the participants while doing the same task as the first experiment. The results showed that the participants' preference for left-brighter faces were stronger when the participant started viewing from the left. The gaze direction may modulate our impression-formation (Shimojo et al. 2003.

Metal-ceramic alloys in dentistry: a review.

Science.gov (United States)

Roberts, Howard W; Berzins, David W; Moore, B Keith; Charlton, David G

2009-02-01

The purpose of this article is to review basic information about the alloys used for fabricating metal-ceramic restorations in dentistry. Their compositions, properties, advantages, and disadvantages are presented and compared. In addition to reviewing traditional noble-metal and base-metal metal-ceramic alloys, titanium and gold composite alloys are also discussed. A broad search of the published literature was performed using Medline to identify pertinent current articles on metal-ceramic alloys as well as articles providing a historical background about the development of these alloys. Textbooks, the internet, and manufacturers' literature were also used to supplement this information. The review discusses traditional as well as more recently-developed alloys and technologies used in dentistry for fabricating metal-ceramic restorations. Clear advantages and disadvantages for these alloy types are provided and discussed as well as the role that compositional variations have on the alloys' performance. This information should enable clinicians and technicians to easily identify the important physical properties of each type and their primary clinical indications. A number of alloys and metals are available for metal-ceramic use in dentistry. Each has its advantages and disadvantages, primarily based on its specific composition. Continuing research and development are resulting in the production of new technologies and products, giving clinicians even more choices in designing and fabricating metal-ceramic restorations.

Use of Clinical UV Chamber to Disinfect Dental Impressions: A Comparative Study.

Science.gov (United States)

Aeran, Himanshu; Sharma, Sakshi; Kumar, Varun; Gupta, Neelu

2015-08-01

Dental impressions are potential source of infection in a prosthodontic practice. Risk of transmission of infection through saliva, blood etc is considered as hazard for both dentist as well as dental auxiliary staff. A number of methods are currently employed for disinfecting the impressions which are technique sensitive and time consuming. This study focuses on disinfecting impression using dental UV chamber which is commonly employed for storing sterilized instruments. The aim of this invitro study was to evaluate the use of clinical UV chamber to disinfect various impression materials at different time intervals and its comparison with 2% glutaraldehyde using standard immersion technique. Total sample size of 180 specimens was taken from three different impression materials. The impressions were made from 30 dentulous subjects. A total of ten impressions were made for each impression material i.e. alginate, addition silicone and polyether impression material. Six punch samples were taken from each impression. Out of 6 punch sample, one was kept as control, second was disinfected by immersing in freshly prepared 2% glutaraldehyde solution for 10 minutes and remaining four were exposed to UV rays for 3 minutes, 6 minutes, 10 minutes and 15 minutes using dental UV chamber. Amount of disinfection achieved was evaluated by counting the colonies over the culture plates with the help of digital colony. The results showed that the mean CFUs for alginate were found to be i.e. 11797.40 ± 5989.73 (mean ± SD). The mean CFUs for addition silicone impression material was found 7095.40 with a standard deviation of 4268.83 and the mean CFUs for polyether impression material was found to be 2168.92 ± 1676 (mean ± SD). For alginate and addition silicone impression material, disinfection was achieved on exposure to UV rays for a period of 10 minutes. However, for polyether impression material 3 minutes of exposure to UV rays was sufficient to cause complete disinfection.

Outcome dependency alters the neural substrates of impression formation

Science.gov (United States)

Ames, Daniel L.; Fiske, Susan T.

2015-01-01

How do people maintain consistent impressions of other people when other people are often inconsistent? The present research addresses this question by combining recent neuroscientific insights with ecologically meaningful behavioral methods. Participants formed impressions of real people whom they met in a personally involving situation. fMRI and supporting behavioral data revealed that outcome dependency (i.e., depending on another person for a desired outcome) alters previously identified neural dynamics of impression formation. Consistent with past research, a functional localizer identified a region of dorsomedial PFC previously linked to social impression formation. In the main task, this ROI revealed the predicted patterns of activity across outcome dependency conditions: greater BOLD response when information confirmed (vs. violated) social expectations if participants were outcome-independent and the reverse pattern if participants were outcome-dependent. We suggest that, although social perceivers often discount expectancy-disconfirming information as noise, being dependent on another person for a desired outcome focuses impression-formation processing on the most diagnostic information, rather than on the most tractable information. PMID:23850465

Patients' preferences when comparing analogue implant impressions using a polyether impression material versus digital impressions (Intraoral Scan) of dental implants

NARCIS (Netherlands)

Wismeijer, D.; Mans, R.S.; Van Genuchten, M.J.I.M; Reijers, H.A.

2014-01-01

Objectives: The primary objective of this clinical study was to assess the patients' perception of the difference between an analogue impression approach on the one hand and an intra-oral scan (IO scan) on the other when restoring implants in the non-aesthetic zone. A second objective was to analyse

Patients' preferences when comparing analogue implant impressions using a polyether impression material versus digital impressions (Intraoral Scan) of dental implants

NARCIS (Netherlands)

Wismeijer, D.; Mans, R.; van Genugten, M.; Reijers, H.A.

2014-01-01

Objectives The primary objective of this clinical study was to assess the patients' perception of the difference between an analogue impression approach on the one hand and an intra-oral scan (IO scan) on the other when restoring implants in the non-aesthetic zone. A second objective was to analyse

Impression Management: The Web Presence of College Presidents

Science.gov (United States)

Morgan, Joanne Cardin

2013-01-01

Leadership profile pages on organizational websites have become staged opportunities for impression management. This research uses content analysis to examine the strategies of assertive impression management used to construct the leadership Web presence of the 70 presidents of national public universities, as identified in the "US News and…

Comparison Of The Dimensional Stability Of Alginate Impressions ...

African Journals Online (AJOL)

Methodology: Alginate impressions of a master model of truncated metal cones were made and disinfected with 1% sodium hypochlorite constituted from 3.5% household bleach using the spray and immersion technique for 10;20 and 30 minutes. Impressions were cast in dental stone and the linear dimensional differences ...

76 FR 64952 - Advisory Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting

Science.gov (United States)

2011-10-19

... Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting In accordance with section... following meeting: Name: Advisory Committee on Training in Primary Care, Medicine and Dentistry . Dates and... Dentistry (``Advisory Committee'') provides advice and recommendations to the Secretary of the U.S...

75 FR 14446 - Advisory Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting

Science.gov (United States)

2010-03-25

... Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting In accordance with section... following meeting: Name: Advisory Committee on Training in Primary CareMedicine and Dentistry (ACTPCMD... Services Administration, Bureau of Health Professions, Division of Medicine and Dentistry. In the plenary...

77 FR 64116 - Advisory Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting

Science.gov (United States)

2012-10-18

... Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting In accordance with section... following meeting: Name: Advisory Committee on Training in Primary Care Medicine and Dentistry (ACTPCMD... and Dentistry, Bureau of Health Professions, Health Resources and Services Administration, Room 9A-27...

75 FR 36110 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2010-06-24

... University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. Notice... the New York University College of Dentistry, New York, NY. The human remains were removed from... College of Dentistry professional staff in consultation with representatives of the Alabama-Quassarte...

76 FR 30951 - Advisory Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting

Science.gov (United States)

2011-05-27

... Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting In accordance with section... following meeting: Name: Advisory Committee on Training in Primary Care Medicine and Dentistry (ACTPCMD.... Glass, M.D., Ph.D., Advisory Committee Executive Secretary, Division of Medicine and Dentistry, Bureau...

75 FR 64318 - Advisory Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting

Science.gov (United States)

2010-10-19

... Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting In accordance with section... following meeting: Name: Advisory Committee on Training in Primary Care, Medicine and Dentistry (ACTPCMD...., Ph.D., Advisory Committee Executive Secretary, Division of Medicine and Dentistry, Bureau of Health...

Effect of Polyvinyl Siloxane Viscosity on Accuracy of Dental Implant Impressions

Directory of Open Access Journals (Sweden)

Ahmad Ghahremanloo

2017-02-01

Full Text Available Objectives: The aim of this study was to compare the accuracy of dental implant impressions obtained by a combination of different impression techniques and viscosities of polyvinyl siloxane (PVS.Materials and Methods: Four parallel fixtures were placed between mental foramina in a master model of lower dental arch. Three different viscosities (putty/light body, medium body/light body, and monophase: heavy body and direct and indirect techniques (six groups were used, and seven impressions were obtained from each group (n=42. To measure the accuracy of impressions, drift, horizontal, and vertical angles of the implants, as well as the hex rotation of the implants in casts were evaluated using a digitizer device (1μm accuracy, in comparison with master arch. Data were analyzed using five-factor two-way ANOVA and Tukey’s post-hoc test.Results: The accuracy of impressions was assessed and the results showed that direct technique was not significantly different from indirect technique (P>0.05. Also, there were no significant differences between the mentioned viscosities except for the horizontal angle (P=0.006.Conclusions: Viscosity of impression materials is of high significance for the accuracy of dental impressions.Keywords: Dental Materials; Dental Implants; Dental Impression Technique; Viscosity; Vinyl Polysiloxane; Dimensional Measurement Accuracy

Impressions of functional food consumers.

Science.gov (United States)

Saher, Marieke; Arvola, Anne; Lindeman, Marjaana; Lähteenmäki, Liisa

2004-02-01

Functional foods provide a new way of expressing healthiness in food choices. The objective of this study was to apply an indirect measure to explore what kind of impressions people form of users of functional foods. Respondents (n=350) received one of eight versions of a shopping list and rated the buyer of the foods on 66 bipolar attributes on 7-point scales. The shopping lists had either healthy or neutral background items, conventional or functional target items and the buyer was described either as a 40-year-old woman or man. The attribute ratings revealed three factors: disciplined, innovative and gentle. Buyers with healthy background items were perceived as more disciplined than those having neutral items on the list, users of functional foods were rated as more disciplined than users of conventional target items only when the background list consisted of neutral items. Buyers of functional foods were regarded as more innovative and less gentle, but gender affected the ratings on gentle dimension. The impressions of functional food users clearly differ from those formed of users of conventional foods with a healthy image. The shopping list method performed well as an indirect method, but further studies are required to test its feasibility in measuring other food-related impressions.

Effects of disinfecting alginate impressions on the scratch hardness of stone models.

Science.gov (United States)

Hiraguchi, Hisako; Nakagawa, Hisami; Wakashima, Mitsuru; Miyanaga, Kohichi; Saigo, Masataka; Nishiyama, Minoru

2006-03-01

This study investigated the effects of disinfecting alginate impressions on the scratch depth of resultant stone models. Eleven brands of alginate impression material and two disinfectants, 1% sodium hypochlorite and 2% glutaraldehyde, were used. Impressions were immersed in disinfectant solutions or stored in sealed bags after spraying with disinfectants, and then poured with a type V dental stone. The scratch depth of the stone model obtained from disinfected impression was measured. The storage of alginate impressions after spraying with disinfectants did not increase the scratch depth of resultant stone models. However, the effect of immersion in disinfectants on scratch depth varied with the brand of the alginate impression material.

Comparative study of faculties of dentistry of Rio de Janeiro and Universidade Federal da Paraiba in relation to teaching of radiation protection in Dentistry

International Nuclear Information System (INIS)

Padilha Filho, L.G.; Raymundo Junior, R.; Koch, H.A.; Guedes, W.M.S.; Oliveira, L.C.G.; Berquo, F.R.; Cherchinaro, C.C.

2001-01-01

This study compares the qualification and formation in radiation protection, of the students of Dentistry Faculties of Universities in Rio de Janeiro and Paraiba States (Brazil), and recommends the inclusion of Radiation Protection and Image Quality discipline, in the curriculum of Dentistry Faculties, in order to unify the contents and programs in the different study plans. Also to elaborate an appropriate educational training, so that the students of the Brazilian Universities can have the same knowledge about these important themes

Implant dentistry in postgraduate university education. Present conditions, potential, limitations and future trends.

Science.gov (United States)

Mattheos, N; Wismeijer, D; Shapira, L

2014-03-01

In recent years, opportunities for postgraduate university education in implant dentistry have increased significantly, with an increase in both the number but also the complexity of available postgraduate programmes. However, there appears to be a lack of standards directing the learning outcomes of such programmes. A scientific literature search was conducted for publications reporting on university programmes within implant dentistry, including description of programmes and evaluation of learning outcomes. A separate Internet search was conducted to collect information on existing university programmes as presented on university websites. Implant dentistry has reached a critical mass of an independent, multidisciplinary and vibrant domain of science, which combines knowledge and discovery from many clinical and basic sciences. Many university programmes conclude with a master's or equivalent degree, but there appears to be a great diversity with regard to duration and learning objectives, as well as targeted skills and competences. The importance of implant dentistry has also increased within established specialist training programmes. There was little indication, however, that the comprehensive aspects of implant dentistry are present in all specialist training programmes where implants are being covered. Although universities should maintain the options of designing academic programmes as they best see fit, it is imperative for them to introduce some form of transparent and comparable criteria, which will allow the profession and the public to relate the degree and academic credentials to the actual skills and competences of the degree holder. With regard to established specialist training programmes, the interdisciplinary and comprehensive nature of implant dentistry needs to be emphasised, covering both surgical and restorative aspects. Finally, implant dentistry is not, at present, a dental specialty. The profession has not reached a consensus as to whether

The impact of managed care in dentistry.

Science.gov (United States)

Clouse, H R

1999-01-01

Managed care plans attempt to control health care expenditures aggressively. These plans directly influence access to medical care and the type, level, and frequency of care rendered. As a result, hospital stays are reduced, focus shifts from inpatient to outpatient care, and patients are responsible for a larger share of health care costs. Dentistry is not immune from the impact of managed care. The attractiveness of the dental market has drawn many managed care organizations, insurers, and entrepreneurs to encourage dentists to participate in a wide variety of managed care programs. However, the delivery of dental care differs markedly in many respects from that of medical care. Therefore, many of the cost saving aspects of managed care that have been so successful in medicine may not result in similar cost savings in dentistry.

77 FR 42508 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2012-07-19

... Inventory Completion: New York University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. SUMMARY: The New York University College of Dentistry has completed an inventory... the New York University College of Dentistry. Repatriation of the human remains to the Indian tribes...

77 FR 42513 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2012-07-19

... Inventory Completion: New York University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. SUMMARY: The New York University College of Dentistry has completed an inventory... the New York University College of Dentistry. Disposition of the human remains to the Indian tribes...

77 FR 42507 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2012-07-19

... Inventory Completion: New York University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. SUMMARY: The New York University College of Dentistry has completed an inventory... the New York University College of Dentistry. Disposition of the human remains to the Indian tribes...

75 FR 52021 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2010-08-24

... University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. Notice... University College of Dentistry, New York, NY. The human remains were removed from Port Clarence, Nome County... the human remains was made by New York University College of Dentistry professional staff in...

75 FR 33327 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2010-06-11

... University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. Notice... the New York University College of Dentistry, New York, NY. The human remains were removed from the... College of Dentistry professional staff in consultation with representatives of the Caddo Nation of...

Prevention of Prosthetic Dentistry

Directory of Open Access Journals (Sweden)

Eremin O.V.

2011-03-01

Full Text Available Prevention in prosthetic dentistry is not just a regular oral hygiene and the prevention of caries in the early stages of its development. The initial goal of orthopedic and dental should be the ability to convey to the patient's sense of pros-thetics that proteziruya one saved more. An example is included prosthetic dental arch defects with bridges or single artificial crowns on implants that will prevent movement of teeth and the continuity of the dentition

[Brazilian bibliographical output on public oral health in public health and dentistry journals].

Science.gov (United States)

Celeste, Roger Keller; Warmling, Cristine Maria

2014-06-01

The scope of this paper is to describe characteristics of the scientific output in the area of public oral health in journals on public health and dentistry nationwide. The Scopus database of abstracts and quotations was used and eight journals in public health, as well as ten in dentistry, dating from 1947 to 2011 were selected. A research strategy using key words regarding oral health in public health and key words about public health in dentistry was used to locate articles. The themes selected were based on the frequency of key words. Of the total number of articles, 4.7% (n = 642) were found in oral health journals and 6.8% (n = 245) in public health journals. Among the authors who published most, only 12% published in both fields. There was a percentile growth of public oral health publications in dentistry journals, though not in public health journals. In dentistry, only studies indexed as being on the topic of epidemiology showed an increase. In the area of public health, planning was predominant in all the phases studied. Research to evaluate the impact of research and postgraduate policies in scientific production is required.

Distance Learning: Effectiveness of an Interdisciplinary Course in Speech Pathology and Dentistry

Science.gov (United States)

Ramos, Janine Santos; da Silva, Letícia Korb; Pinzan, Arnaldo; de Castro Rodrigues, Antonio; Berretin-Felix, Giédre

2015-01-01

Objective: Evaluate the effectiveness of distance learning courses for the purpose of interdisciplinary continuing education in Speech Pathology and Dentistry. Methods: The online course was made available on the Moodle platform. A total of 30 undergraduates participated in the study (15 from the Dentistry course and 15 from the Speech Pathology…

Techniques to administer oral, inhalational, and IV sedation in dentistry

Directory of Open Access Journals (Sweden)

Diana Krystyna Harbuz

2016-02-01

Full Text Available Background Sedation in dentistry is a controversial topic given the variety of opinions regarding its safe practice. Aims This article evaluates the various techniques used to administer sedation in dentistry and specific methods practiced to form a recommendation for clinicians. Methods An extensive literature search was performed using PubMed, Medline, Google Scholar, Google, and local library resources. Results Most of the literature revealed a consensus that light sedation on low-risk American Society of Anesthesiologists (ASA groups, that is ASA I, and possibly II, is the safest method for sedation in a dental outpatient setting. Conclusion Formal training is essential to achieve the safe practice of sedation in dentistry or medicine. The appropriate setting for sedation should be determined as there is an increased risk outside the hospital setting. Patients should be adequately assessed and medication titrated appropriately, based on individual requirements.

An impressive start

CERN Multimedia

2011-01-01

This has been an excellent week for the LHC, with a succession of fills rapidly increasing the number of proton bunches to 194 per beam. This has allowed the experiments to reach a peak luminosity of 2.5 × 1032 cm-2s-1, thereby surpassing the record for 2010 where we reached 2.0 × 1032 cm-2s-1. At the time of writing, the integrated luminosity delivered by the LHC in 2011 is around 28 inverse picobarns, which is already more than half of the total 2010 dataset.   These are impressive numbers, but what impresses me most is how quickly the LHC operators are now able to turn the machine around between fills, and how well LHC running has been incorporated into the overall operation of CERN’s accelerator complex. The flexibility of the LHC was illustrated on Thursday when we started a short phase of running at 1.38 TeV per beam, equivalent to the energy-per-nucleon of a lead-ion run. This lower energy data will be used by the experiments, in particular by ALICE, to compare...

77 FR 36550 - Advisory Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting

Science.gov (United States)

2012-06-19

... Committee on Training in Primary Care Medicine and Dentistry; Notice of Meeting In accordance with section... following meeting: Name: Advisory Committee on Training in Primary Care, Medicine and Dentistry (ACTPCMD... report. The meeting on July 20, 2012, will begin with an update on the Division of Medicine and Dentistry...

75 FR 33329 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY

Science.gov (United States)

2010-06-11

... University College of Dentistry, New York, NY AGENCY: National Park Service, Interior. ACTION: Notice. Notice... the New York University College of Dentistry, New York, NY. The human remains were removed from.... A detailed assessment of the human remains was made by the New York University College of Dentistry...

Intraoral digital impressions to enhance implant esthetics.

Science.gov (United States)

Hinds, Kenneth F

2014-09-01

Providing an accurate soft-tissue transfer for anterior implants is not a new concept; however, it is currently an especially relevant one. There are numerous documented cases in which residual excess cement with cement-retained implant restorations was a contributing cause in periimplantitis. In 2012, Wadhwani et al reported the importance of placing the crown abutment margins supragingivally for ease of cement removal as a possible solution to address this important issue. Therefore, if placement of the crown abutment margin location is imperative, making an impression that reproduces the soft tissue is equally critical. In 1997, this author introduced the "custom impression coping" to achieve such an accurate transfer. Given the wide use of intraoral digital impressions in 2014, this discussion describes how to fabricate a "custom scan body" using that technology to replicate the transition zone in the virtual environment.

Auditory and visual spatial impression: Recent studies of three auditoria

Science.gov (United States)

Nguyen, Andy; Cabrera, Densil

2004-10-01

Auditory spatial impression is widely studied for its contribution to auditorium acoustical quality. By contrast, visual spatial impression in auditoria has received relatively little attention in formal studies. This paper reports results from a series of experiments investigating the auditory and visual spatial impression of concert auditoria. For auditory stimuli, a fragment of an anechoic recording of orchestral music was convolved with calibrated binaural impulse responses, which had been made with the dummy head microphone at a wide range of positions in three auditoria and the sound source on the stage. For visual stimuli, greyscale photographs were used, taken at the same positions in the three auditoria, with a visual target on the stage. Subjective experiments were conducted with auditory stimuli alone, visual stimuli alone, and visual and auditory stimuli combined. In these experiments, subjects rated apparent source width, listener envelopment, intimacy and source distance (auditory stimuli), and spaciousness, envelopment, stage dominance, intimacy and target distance (visual stimuli). Results show target distance to be of primary importance in auditory and visual spatial impression-thereby providing a basis for covariance between some attributes of auditory and visual spatial impression. Nevertheless, some attributes of spatial impression diverge between the senses.

Digitization of dental alginate impression: Three-dimensional evaluation of point cloud.

Science.gov (United States)

Kim, So-Ri; Lee, Wan-Sun; Kim, Woong-Chul; Kim, Hea-Young; Kim, Ji-Hwan

2015-01-01

The purpose of this study was to evaluate the digitization of alginate impressions by analyzing differences between the scan data of two types of impressions (alginate and rubber) taken from the master die and the scan data for the master die. The master die and impressions were digitized using a dental laser scanner (7 series, Dental Wings, Montreal, Canada). The crown portion of the abutment teeth in the digital data of 20 impressions was divided into three regions: cervical surface, middle surface, and occlusal surface. An independent t-test showed a significant difference (palginate and rubber). One-way ANOVA and Tukey's honest significant difference test revealed a significant difference (palginate impressions in the future.

Dental implants: A boon to dentistry

Directory of Open Access Journals (Sweden)

B H Sripathi Rao

2015-01-01

Full Text Available The development and use of implants is one of the biggest advances in dentistry in the last few decades. It has helped to give many solutions to tooth loss as well as maxillo facial prosthetics. This article traces the history and evolution of dental implants.

A Framework on Impression Management in Negotiation

DEFF Research Database (Denmark)

Mathiasen, Ditte Dahl; Esbjerg, Lars

2014-01-01

In this paper we develop a dramaturgical framework to provide us with a new understanding of how negotiators use impression management behaviour during the negotiation process to position themselves in an endeavour to reach a desirable outcome.......In this paper we develop a dramaturgical framework to provide us with a new understanding of how negotiators use impression management behaviour during the negotiation process to position themselves in an endeavour to reach a desirable outcome....

Can Dentistry Have Two Contracts with the Public?

Science.gov (United States)

Nash, David A

2015-01-01

The social contract is an implicit agreement between parts of society and society as a whole. Since the Middle Ages, the learned professions, recently including dentistry, have had a covenantal relationship with the public based on trust, exchanging monopoly privileges for benefiting the public good. Unlike commercial trade in commodities, professional relationships are grounded in ensuring an adequate level of oral health to all. A second contract is emerging where dentists relate to society as business operators, exchanging commodity services for a price. Recent actions by the Federal Trade Commission and the U.S. Supreme Court make it unlikely that dentistry will be able to enjoy only selected aspects of each contract while avoiding obligations that it finds unfavorable.

Regenerative Perspective in Modern Dentistry

Directory of Open Access Journals (Sweden)

Mihnea Ioan Nicolescu

2016-04-01

Full Text Available This review aims to trace the contour lines of regenerative dentistry, to offer an introductory overview on this emerging field to both dental students and practitioners. The crystallized depiction of the concept is a translational approach, connecting dental academics to scientific research and clinical utility. Therefore, this review begins by presenting the general features of regenerative medicine, and then gradually introduces the specific aspects of major dental subdomains, highlighting the progress achieved during the last years by scientific research and, in some cases, which has already been translated into clinical results. The distinct characteristics of stem cells and their microenvironment, together with their diversity in the oral cavity, are put into the context of research and clinical use. Examples of regenerative studies regarding endodontic and periodontal compartments, as well as hard (alveolar bone and soft (salivary glands related tissues, are presented to make the reader further acquainted with the topic. Instead of providing a conclusion, we will emphasize the importance for all dental community members, from young students to experienced dentists, of an early awareness rising regarding biomedical research progress in general and regenerative dentistry in particular.

Effect of Polyvinyl Siloxane Viscosity on Accuracy of Dental Implant Impressions.

Science.gov (United States)

Ghahremanloo, Ahmad; Seifi, Mahdieh; Ghanbarzade, Jalil; Abrisham, Seyyed Mohammad; Javan, Rashid Abdolah

2017-01-01

The aim of this study was to compare the accuracy of dental implant impressions obtained by a combination of different impression techniques and viscosities of polyvinyl siloxane (PVS). Four parallel fixtures were placed between mental foramina in a master model of lower dental arch. Three different viscosities (putty/light body, medium body/light body, and monophase: heavy body) and direct and indirect techniques (six groups) were used, and seven impressions were obtained from each group (n=42). To measure the accuracy of impressions, drift, horizontal, and vertical angles of the implants, as well as the hex rotation of the implants in casts were evaluated using a digitizer device (1μm accuracy), in comparison with master arch. Data were analyzed using five-factor two-way ANOVA and Tukey's post-hoc test. The accuracy of impressions was assessed and the results showed that direct technique was not significantly different from indirect technique (P>0.05). Also, there were no significant differences between the mentioned viscosities except for the horizontal angle (P=0.006). Viscosity of impression materials is of high significance for the accuracy of dental impressions.

The Importance of Subtextual Impression Management and Business Faculty.

Science.gov (United States)

Chaney, Lillian H.; Lyden, Julie A.

1998-01-01

College students (n=265) reported their impressions of business faculty's personal appearance, body language, behavior, and office appearance. Findings indicate that impression management is useful for professors who want to convey credibility, authority, and interest in students. (JOW)

75 FR 69686 - Advisory Committee on Training in Primary Care Medicine and Dentistry

Science.gov (United States)

2010-11-15

... DEPARTMENT OF HEALTH AND HUMAN SERVICES Health Resources and Services Administration Advisory Committee on Training in Primary Care Medicine and Dentistry AGENCY: Health Resources and Services... of the Advisory Committee on Training in Primary Care Medicine and Dentistry, November 15, 2010, 8:30...

Production of a calcium silicate cement material from alginate impression material.

Science.gov (United States)

Washizawa, Norimasa; Narusawa, Hideaki; Tamaki, Yukimichi; Miyazaki, Takashi

2012-01-01

The purpose of this study was to synthesize biomaterials from daily dental waste. Since alginate impression material contains silica and calcium salts, we aimed to synthesize calcium silicate cement from alginate impression material. Gypsum-based investment material was also investigated as control. X-ray diffraction analyses revealed that although firing the set gypsum-based and modified investment materials at 1,200°C produced calcium silicates, firing the set alginate impression material did not. However, we succeeded when firing the set blend of pre-fired set alginate impression material and gypsum at 1,200°C. SEM observations of the powder revealed that the featured porous structures of diatomite as an alginate impression material component appeared useful for synthesizing calcium silicates. Experimentally fabricated calcium silicate powder was successfully mixed with phosphoric acid solution and set by depositing the brushite. Therefore, we conclude that the production of calcium silicate cement material is possible from waste alginate impression material.

Dimensional Changes of Alginate Dental Impression Materials-An Invitro Study.

Science.gov (United States)

Kulkarni, Manisha M; Thombare, Ram U

2015-08-01

Dentists are always looking ahead for more dimensionally stable material for accurate and successful fabrication of prosthesis in this competitive world. Arrival of newer materials and increased material market puts dentists in dilemma for selection of material. The study evaluated the effect of variations in time of pour and temperature on dimensional stability of three brands of commercially available alginates. Velplast, Marieflex & Zelgan alginate impression materials were evaluated by measuring dimensional accuracy of the master cast. A die was prepared and mounted on the apparatus for the ease of impression making. The prepared casts were categorized into five groups and made up of three brands of alginate impression material with variation in time of pour viz: immediate, 20&40 minutes interval and with varying temperature of 25(0)C, 30(0)C & 40(0)C. Impressions showed least distortion at varying degrees of temperature for 20 minutes, but the values obtained by storing of alginate impressions for 20 minutes at 30(0)C were found to be nearly accurate than the values obtained by storing of impression at 40(0)C. However, storing showed shrinkage of impressions. Marieflex showed better accuracy in comparison with other two materials. Maintenance of temperature and humidity play key role during storage & transport to prevent distortion. But the study suggests immediate pouring which will minimize the distortion. The manipulation instructions, temperature of mixing water, environment & water powder ratio also plays key role in minimizing the distortion.

Functional Impressions in Complete Denture and Overdenture Treatment

Directory of Open Access Journals (Sweden)

Hrvoje Kršek

2015-01-01

Full Text Available Tooth loss can cause loss of occlusal, masticatory, esthetic, physiognomic, phonetic and psychosocial function of patients. The most frequently used treatment method of completely edentulous patients and patients with a small number of remaining teeth are complete dentures or overdentures. One of the most important clinical and laboratory procedures in their fabrication is functional impression taking. The aim of this paper was to present procedures of taking functional impressions in fabrication of complete dentures and overdentures, using standardized techniques and materials. An accurate functional impression together with other correctly performed clinical and laboratory procedures ensure good retention and stability of dentures, which is a precondition for restoring patients’ lost functions.

Interior design for dentistry.

Science.gov (United States)

Unthank, M; True, G

1999-11-01

In the increasingly complex, competitive and stressful field of dentistry, effectively designed dental offices can offer significant benefits. Esthetic, functional and life-cycle cost issues to be considered when developing your interior design scheme include color, finishes, lighting, furnishings, art and accessories. An appropriately designed dental office serves as a valuable marketing tool for your practice, as well as a safe and enjoyable work environment. Qualified interior design professionals can help you make design decisions that can yield optimum results within your budget.

Lasers in medicine and dentistry.

Science.gov (United States)

Lehnert, M W

1996-01-01

Since their introduction, great enthusiasm has greeted the application of lasers to medicine and dentistry. The future is exciting. Research will someday take us to the days of the "Star Trek" laser-scan tooth or bone repair procedures. Lasers are very specific in their application. Choose this new technology carefully, making choices and purchases based on quality scientific research and ongoing analysis and review.

Impression Management and the Control of Social Anxieties.

Science.gov (United States)

Miller, Rowland S.

Impression management refers to the concept that people engaged in interaction will attempt to control the image of themselves that others form. This provides a foundation for social interaction, giving others information about who we are and what to expect from us. A central concern of impression management is the manner in which we are evaluated…

Electronic Health Record for Forensic Dentistry

Czech Academy of Sciences Publication Activity Database

Zvárová, Jana; Dostálová, T.; Hanzlíček, Petr; Teuberová, Z.; Nagy, Miroslav; Pieš, Martin; Seydlová, M.; Eliášová, H.; Šimková, H.

2008-01-01

Roč. 47, č. 1 (2008), s. 8-13 ISSN 0026-1270 R&D Projects: GA MŠk(CZ) 1M06014 Institutional research plan: CEZ:AV0Z10300504 Keywords : electronic health record * structured data entry * forensic dentistry Subject RIV: IN - Informatics, Computer Science Impact factor: 1.057, year: 2008

The Modern Value of Early Writings in Medicine and Dentistry.

Science.gov (United States)

Peck, Sheldon

2016-01-01

This article illustrates three examples supporting the modern value of early writings in dentistry and medicine. First, by studying cases described in works published long before the era of genetic science, we are able to develop new hypotheses about familial conditions and their genetic roots. Tooth transposition is presented as an example. Second, old writings may lead us to valuable historical insights and perspectives in medicine that can be revealed only in retrospective analysis. An example of this kind of historical analysis uncovers why dentistry became unnaturally separated from mainstream medicine in the 19th century. Third, early writings become keys to unlocking forgotten knowledge that enriches our understanding of historically significant people and events. The discovery of Norman Kingsley's long forgotten pyrographic paintings after Rembrandt portraits is used as an example. Libraries, the traditional custodians of these valued old texts, must continue to be supported, and not undermined by the paperless digital revolution. Copyright American Academy of the History of Dentistry.

Zeal of Acceptance: Balancing Image and Business in Early Twentieth-century American Dentistry

DEFF Research Database (Denmark)

Grumsen, Stine Slot

2012-01-01

to influence marketing strategies of dental manufacturers, reverse the relationship between manufacturers and the profession of dentistry, to brand dentistry in a wider, public context, and how it became an economic thorn in the side of the Board of Trustees of the American Dental Association....

Work plan for testing silicone impression material and fixture on pool cell capsule

International Nuclear Information System (INIS)

Lundeen, J.E.

1994-01-01

The purpose of this work plan is to provide a safe procedure to test a cesium capsule impression fixture at Waste Encapsulation and Storage Facility (WESF). The impression will be taken with silicone dental impression material pressed down upon the capsule using the impression fixture. This test will evaluate the performance of the fixture and impression material under high radiation and temperature conditions on a capsule in a WESF pool cell

77 FR 42510 - Notice of Inventory Completion: New York University College of Dentistry, New York, NY; Correction

Science.gov (United States)

2012-07-19

... Inventory Completion: New York University College of Dentistry, New York, NY; Correction AGENCY: National... of human remains under the control of the New York University College of Dentistry, New York, NY. The... Dentistry professional staff in consultation with representatives of the Delaware Nation of Oklahoma...

Extrusion-mixing compared with hand-mixing of polyether impression materials?

Science.gov (United States)

McMahon, Caroline; Kinsella, Daniel; Fleming, Garry J P

2010-12-01

The hypotheses tested were two-fold (a) whether altering the base:catalyst ratio influences working time, elastic recovery and strain in compression properties of a hand-mixed polyether impression material and (b) whether an extrusion-mixed polyether impression material would have a significant advantage over a hand-mixed polyether impression material mixed to the optimum base:catalyst ratio. The polyether was hand-mixed at the optimum (manufacturers recommended) base:catalyst ratios (7:1) and further groups were made by increasing or decreasing the catalyst length by 25%. Additionally specimens were also made from an extrusion-mixed polyether impression material and compared with the optimum hand-mixed base:catalyst ratio. A penetrometer assembly was used to measure the working time (n=5). Five cylindrical specimens for each hand-mixed and extrusion mixed group investigated were employed for elastic recovery and strain in compression testing. Hand-mixing polyether impression materials with 25% more catalyst than that recommended significantly decreased the working time while hand-mixing with 25% less catalyst than that recommended significantly increased the strain in compression. The extrusion-mixed polyether impression material provided similar working time, elastic recovery and strain in compression to the hand-mixed polyether mixed at the optimum base:catalyst ratio.

The public impression of radiation as a product of science communication

International Nuclear Information System (INIS)

Kim, Hak Soo; Ha, Hyo Suk; Oh, Mi Young; Choi, Jin Myeung

2008-01-01

The purpose of this study is to observe how the public impression of radiation is changing over the North Korea’s nuclear bomb test. We found that the nuclear bomb test brought more negative impressions of radiation, but, in one year, more positive ones prevailed as in the pre-bomb-test. Those positive impressions were found to be composed of useful and positive elements mostly relative to health care. This suggests that we need to apply radiation (fusion) technology to solving everyday life problems in order to bring more positive impressions of radiation

Knowledge of drug prescription in dentistry students

Directory of Open Access Journals (Sweden)

Guzmán-Álvarez R

2012-06-01

Full Text Available R Guzmán-Álvarezv,1 M Medeiros,2,3 LI Reyes Lagunes,4 AE Campos-Sepúlveda11Pharmacology Department, UNAM School of Medicine and Dentistry, Mexico City, 2Pharmacology Clinical Seminar, UNAM School of Medicine, Mexico City, 3Medical Sciences Department, Mexico Federico Gómez Children's Hospital, Mexico City, 4Measuring and Evaluation Unit, UNAM School of Psychology, Mexico City, MexicoBackground: Students in schools of dentistry attend to patients with illnesses, and often prescribe medication. Because students are still learning, they are influenced by a variety of factors: the different teaching approaches of the professors at the clinics and in the pharmacology course, fellow students, and even the information provided by the pharmaceutical industry.Objectives: The aim of this pilot study was to assess the prescription knowledge and common mistakes in fourth-year students at the School of Dentistry at the Universidad Nacional Autónoma de México.Methods: In March 2010, a survey was conducted among 66 fourth-year students at the School of Dentistry, applying a previously validated questionnaire consisting of six open-ended questions The following factors were assessed: the most frequent illness requiring dental prescription; the most prescribed nonsteroidal anti-inflammatory drugs and antibiotics; the most frequent errors; sources of information used for prescribing drugs; and whether the students knew and followed the World Health Organization Guide to Good Prescribing.Results: The most frequent response for each question was considered the most significant. The most common reason for prescribing medication was infection (n = 37, 56%, followed by pain (n = 24, 38%; the most used painkillers were ibuprofen and acetaminophen at equal levels (n = 25, 37.8%, followed by ketorolac (n = 7, 10.6%, naproxen (n = 6, 9.1%, diclofenac (n = 2, 3%, and aspirin (n = 1, 1.5%; the most widely prescribed antibiotics were amoxicillin (n = 52, 78

The Risk of Bias in Randomized Trials in General Dentistry Journals.

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Hinton, Stephanie; Beyari, Mohammed M; Madden, Kim; Lamfon, Hanadi A

2015-01-01

The use of a randomized controlled trial (RCT) research design is considered the gold standard for conducting evidence-based clinical research. In this present study, we aimed to assess the quality of RCTs in dentistry and create a general foundation for evidence-based dentistry on which to perform subsequent RCTs. We conducted a systematic assessment of bias of RCTs in seven general dentistry journals published between January 2011 and March 2012. We extracted study characteristics in duplicate and assessed each trial's quality using the Cochrane Risk of Bias tool. We compared risk of bias across studies graphically. Among 1,755 studies across seven journals, we identified 67 RCTs. Many included studies were conducted in Europe (39%), with an average sample size of 358 participants. These studies included 52% female participants and the maximum follow-up period was 13 years. Overall, we found a high percentage of unclear risk of bias among included RCTs, indicating poor quality of reporting within the included studies. An overall high proportion of trials with an "unclear risk of bias" suggests the need for better quality of reporting in dentistry. As such, key concepts in dental research and future trials should focus on high-quality reporting.

Dentistry in the 21st century: challenges of a globalising world.

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Hayashi, Mikako; Haapasalo, Markus; Imazato, Satoshi; Lee, Jae Il; Momoi, Yasuko; Murakami, Shinya; Whelton, Helen; Wilson, Nairn

2014-12-01

Oral health is - literally - vital to good general health, not least because the mouth is the sentinel of the body. Dentistry, the Cinderella of health care, faces immense challenges of globalisation. Governments, having spent freely on everything from defence to social security, face mountains of debts which make budget cutbacks essential. Simultaneously, most developed countries have to pay increasing costs of caring for rapidly ageing populations. Dentistry is being pulled two ways: wealthy members of society demand high-end expensive treatment, much of it cosmetic rather than necessary to deal with disease, whereas many millions of poor people in developing countries cannot afford basic dental treatment and may never see a dentist. Too many governments and dentists persist with the expensive and destructive regime of 'drill and fill (and bill)'. International advances in care may not reach the clinician's chair because treatment guidelines and payments are set locally. An international symposium to celebrate Mikako Hayashi becoming Professor of Restorative Dentistry and Endodontology at Osaka University concluded that dentistry should move from an increasingly un-affordable curative model to a cost-effective evidence-based preventive model. The goal is to help people retain healthy natural teeth throughout their lives, as an essential part of enhancing their general health. © 2014 FDI World Dental Federation.

Three-dimensional accuracy of different impression techniques for dental implants

Directory of Open Access Journals (Sweden)

Mohammadreza Nakhaei

2015-01-01

Full Text Available Background: Accurate impression making is an essential prerequisite for achieving a passive fit between the implant and the superstructure. The aim of this in vitro study was to compare the three-dimensional accuracy of open-tray and three closed-tray impression techniques. Materials and Methods: Three acrylic resin mandibular master models with four parallel implants were used: Biohorizons (BIO, Straumann tissue-level (STL, and Straumann bone-level (SBL. Forty-two putty/wash polyvinyl siloxane impressions of the models were made using open-tray and closed-tray techniques. Closed-tray impressions were made using snap-on (STL model, transfer coping (TC (BIO model and TC plus plastic cap (TC-Cap (SBL model. The impressions were poured with type IV stone, and the positional accuracy of the implant analog heads in each dimension (x, y and z axes, and the linear displacement (ΔR were evaluated using a coordinate measuring machine. Data were analyzed using ANOVA and post-hoc Tukey tests (α = 0.05. Results: The ΔR values of the snap-on technique were significantly lower than those of TC and TC-Cap techniques (P < 0.001. No significant differences were found between closed and open impression techniques for STL in Δx, Δy, Δz and ΔR values (P = 0.444, P = 0.181, P = 0.835 and P = 0.911, respectively. Conclusion: Considering the limitations of this study, the snap-on implant-level impression technique resulted in more three-dimensional accuracy than TC and TC-Cap, but it was similar to the open-tray technique.

The quality of impressions for crowns and bridges: an assessment of the work received at three commercial dental laboratories. assessing qualities of impressions that may lead to occlusal discrepancies with indirect restorations.

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Storey, D; Coward, T J

2014-03-01

There are few published studies that directly assess the quality of impressions for crowns and bridges in the UK. This paper considers aspects of impression quality with particular attention to factors causing potential occlusal discrepancies in the final restoration. To this end three dental laboratories were visited over a 3-month period. All impressions for conventional crown and bridgework that arrived on the days of the visits were examined and assessed against criteria defined on a custom-designed assessment form. A total of 206 impression cases were considered in this study. Flexible impression trays were used for 65% of working impressions. Their use was more common for NHS work than for private work. 31.9% of all alginate impressions examined were not adequately fixed to the tray. Visible contamination of impressions was not uncommon.

Inhibition of Ubc13-mediated Ubiquitination by GPS2 Regulates Multiple Stages of B Cell Development.

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Lentucci, Claudia; Belkina, Anna C; Cederquist, Carly T; Chan, Michelle; Johnson, Holly E; Prasad, Sherry; Lopacinski, Amanda; Nikolajczyk, Barbara S; Monti, Stefano; Snyder-Cappione, Jennifer; Tanasa, Bogdan; Cardamone, M Dafne; Perissi, Valentina

2017-02-17

Non-proteolytic ubiquitin signaling mediated by Lys 63 ubiquitin chains plays a critical role in multiple pathways that are key to the development and activation of immune cells. Our previous work indicates that GPS2 (G-protein Pathway Suppressor 2) is a multifunctional protein regulating TNFα signaling and lipid metabolism in the adipose tissue through modulation of Lys 63 ubiquitination events. However, the full extent of GPS2-mediated regulation of ubiquitination and the underlying molecular mechanisms are unknown. Here, we report that GPS2 is required for restricting the activation of TLR and BCR signaling pathways and the AKT/FOXO1 pathway in immune cells based on direct inhibition of Ubc13 enzymatic activity. Relevance of this regulatory strategy is confirmed in vivo by B cell-targeted deletion of GPS2, resulting in developmental defects at multiple stages of B cell differentiation. Together, these findings reveal that GPS2 genomic and non-genomic functions are critical for the development and cellular homeostasis of B cells. © 2017 by The American Society for Biochemistry and Molecular Biology, Inc.

Impression management within the Zulu culture: Exploring tactics in the work context

OpenAIRE

Mtshelwane, Debrah; Nel, Jan Alewyn; Brink, Lizelle

2016-01-01

Orientation: Impression management tactics are utilised differently by people depending on the situation and the others around them. Research purpose: The purpose of the study was to identify the impression management tactics Zulu people display when they want to impress people in a work context. Motivation for this study: Organisations are competing for talented employees and people who contribute to the return on investment for the organisation. Individuals display impression tactic...

The influence of sequence of impressions on children's anxiety and discomfort.

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Kaakko, Tarja; Horn, Michael T; Weinstein, Philip; Kaufman, Eliezer; Leggott, Penelope; Coldwell, Susan E

2003-01-01

Laboratory studies with adults and children have found lower pain reports when pain proceeds from high to low rather than from low to high. However, pediatric dentists often ease children into difficult procedures (from easiest to most difficult). This study investigated the influence of order during a clinical procedure that involved taking maxillary and mandibular alginate impressions. Subjects were 24 children aged 5 to 6 years (preoperational stage) and 24 children aged 9 to 10 years (concrete operational stage). Children were randomly assigned to either start with the mandibular (presumed to be easier) or start with the maxillary (presumed to be harder) impressions. Discomfort during the sequence of impressions was measured using the "Affective Facial Scale." A telephone interview was conducted 2 weeks later to evaluate the memory of discomfort. The results indicated that the older children who started with the mandibular (easier) impression and ended with the maxillary (more uncomfortable) impression reported significantly lower discomfort than older children who started with the maxillary impression and ended with the mandibular (Mann-Whitney U, Z = -2.08; P < .037). The same tendency was noted 2 weeks later on a telephone interview. By phone, 92% of the older children who started with the mandibular impression rated the sequence of impressions as "not at all bad," while only 58% of the older children who started with the maxillary impression rated the overall experience as "not at all bad" (chi2 = 3.56, P < .059). The younger children did not show any significant difference in their ratings of discomfort at either of the assessment periods. Consistent with clinical practice, this study observed that older children benefit from beginning an appointment with an easier procedure and working up to a more difficult one.

Trigeminal neuralgia secondary to basilar impression: A case report

Directory of Open Access Journals (Sweden)

Maurus Marques de Almeida Holanda

2015-01-01

Full Text Available We report a rare case of trigeminal neuralgia. A 23-year-old woman with a history of 1 year of typical trigeminal neuralgia manifested the characteristics of basilar impression. Magnetic resonance imaging (MRI demonstrated basilar impression, deformity of the posterior fossa with asymmetry of petrous bone, and compression of medulla oblongata in the topography of the odontoid apophysis. The operation was performed through a suboccipital craniectomy. The neuralgia disappeared after surgery and remains completely resolved until today. This is the second reported case of trigeminal neuralgia in a patient with basilar impression in Brazil.

Single Stage Silicone Border Molded Closed Mouth Impression Technique-Part II.

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Solomon, E G R

2011-09-01

Functioning of a complete denture depends to a great extent on the impression technique. Several impression techniques have been described in the literature since the turn of this century when Greene [Clinical courses in dental prothesis, 1916] brothers introduced the first scientific system of recording dental impression. Advocates of each technique have their own claim of superiority over the other. The introduction of elastomeric impression materials [Skinner and Cooper, J Am Dent Assoc 51:523-536, 1955] has made possible new techniques of recording impression for complete denture construction. These rubber like materials are of two types; one has a polysulfide base and is popularily known as polysulfide rubber (Thiokol and Mercaptan). The other variety has a silicone base known as silicone rubber or silicone elastomer. Silicone elastomers are available in four different consistencies; a thin easy flowing light bodied material,a creamy medium bodied material, a highly viscous heavy bodied material and a kneadable putty material. This paper describes an active closed mouth impression technique with one stage border molding using putty silicone material as a substitute for low fusing compound.

Postdoctoral Teaching of Geriatric Dentistry in U.S. Dental Schools.

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Ettinger, Ronald L; Goettsche, Zachary S; Qian, Fang

2017-10-01

The aim of this study was to determine the number and size of postdoctoral teaching programs in geriatric dentistry in U.S. dental schools and other health professions educational institutions and those programs with Health Resources and Services Administration (HRSA) funding. In 2015, all 67 U.S. dental schools were contacted via email with a questionnaire to ask if they had a postdoctoral program in geriatric dentistry; if they did, they were asked to report the length and size of the program. Directors of all 16 HRSA-funded geriatric fellowships were also invited to participate in the survey. Fifty-six of the 67 (83.6%) dental schools and 15 of the 16 (93.8%) HRSA-funded programs completed the questionnaire. Postdoctoral geriatric dentistry programs were reported in 12 dental schools and six medical institutions, although only six programs were currently accepting fellows. The length of the programs was 12-36 months. The maximum number of residents in any program was ten. The oldest program was in Minnesota; it began in 1981. The newest program was beginning in 2017 at Boston University as a revised version of its previous HRSA-funded program. The loss of HRSA funding has had a major negative impact on the number of training programs. Future research is needed to determine how the loss of HRSA-funded programs has affected the availability of educators in geriatric dentistry for dental schools and the services provided to the geriatric community.

Effect of Splinting on Dimensional Accuracy of Impressions Made of Implants with Different Subgingival Alignments.

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Beyabanaki, Elaheh; Shamshiri, Ahmed Reza; Alikhasi, Marzieh; Monzavi, Abbas

2017-01-01

Placement of implants at deeper levels of gingiva is sometimes inevitable because of issues like esthetics or bone availability. The accuracy of impressions may be affected in these situations. The aim of this in vitro study was to evaluate the effects of splinting and length of impression copings on the accuracy of impressions made of deeply placed implants. A metal model with two parallel implants (Implantium; Dentium) was fabricated. One hundred and twenty impressions were made using the direct impression technique with and without splinting the impression copings (using short and long impression copings). Impressions were made of implants at three subgingival levels (1, 3, and 6 mm) using regular viscosity poly(vinyl siloxane). The impressions were poured with type IV dental stone. Displacements in the x, y, and z axes, as well as rotational discrepancies and interimplant distances were measured with a coordinate measuring machine. Data were analyzed with Kruskal-Wallis, Mann-Whitney, and nonparametric adjusted rank transform tests. There was less rotational displacement using longer impression copings at different subgingival positions of the implants, either with splinted or nonsplinted direct technique (p impressions at different apico-coronal levels of implants than the splinted technique using short impression copings (p impression copings yielded better results than shorter ones in both splinted and nonsplinted techniques. Also, nonsplinted short impression copings produced more accurate impressions than splinted short impression copings. © 2015 by the American College of Prosthodontists.

[The dentist between medicine and cosmetology. Ethical shortcomings of the esthetics boom in dentistry].

Science.gov (United States)

Maio, Giovanni

2009-01-01

Dentistry has evolved from a genuine medical practice to a mere business. From an ethical point of view it is asked whether this evolution creates more problems than it solves. The paper elaborates four arguments against this evolution and shows that aesthetics in dentistry which works only according to market categories runs the risk of loosing the view for the real need of patients. Dentistry which comprehends itself as part of a market will be nothing else than a part of a beauty industry which has the only aim to sell something, but not the aim to help people. Such a dentistry makes profit from the ideology of a society which serves only vanity, youthfulness and personal success and which is losing the sight for real values. The real value of man cannot be reduced to his appearance and medicine as an art should feel the obligation to resist these modern ideologies and should help people to get a more authentic attitude to themselves. If modern dentistry fails to think about these implications it will lose its identity as medicine, which would be too great a loss.

Implant - Identification Tool for Forensic Dentistry

Czech Academy of Sciences Publication Activity Database

Dostálová, T.; Eliášová, H.; Seydlová, M.; Zvárová, Jana

2008-01-01

Roč. 19, č. 9 (2008), s. 926-926 ISSN 0905-7161. [EAO Annual Scientific Meeting /17./. 18.09.2008-20.09.2008, Warsaw] R&D Projects: GA MŠk(CZ) 1M06014 Institutional research plan: CEZ:AV0Z10300504 Keywords : forensic dentistry * identification * electronic health record Subject RIV: IN - Informatics, Computer Science

A laser unit for photodynamic therapy and robot-assisted microsurgery in dentistry

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Chunikhin, A. A.; Bazikyan, E. A.; Pikhtin, N. A.

2017-06-01

Results are presented of photochemical experiments with an IR-laser unit for microsurgery and photodynamic therapy in dentistry. The efficiency of direct generation of singlet oxygen in model organic media in the continuous-wave and pulsed nanosecond modes is examined. The unit can serve both as an independent instrument and as a part of a complex for robot-assisted surgery and dentistry.

Impression Management in Survey Responding: Easier for Collectivists or Individualists?

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Riemer, Hila; Shavitt, Sharon

2012-01-01

Three experiments indicate that when individualists and collectivists engage in impression management on self-reports, they do so through different psychological mechanism s. Collectivists do so through a relatively automatic process. Thus, they can impression manage even when cognitively busy. Individualists impression manage through a more effortful process. Therefore, they can do so only when the situation permits effortful processing. These findings highlight distinct conditions under which social norms may influence consumer self-reports across cultures. PMID:23175618

Impression Management in Survey Responding: Easier for Collectivists or Individualists?

Science.gov (United States)

Riemer, Hila; Shavitt, Sharon

2011-04-01

Three experiments indicate that when individualists and collectivists engage in impression management on self-reports, they do so through different psychological mechanism s. Collectivists do so through a relatively automatic process. Thus, they can impression manage even when cognitively busy. Individualists impression manage through a more effortful process. Therefore, they can do so only when the situation permits effortful processing. These findings highlight distinct conditions under which social norms may influence consumer self-reports across cultures.

Neuromuscular dentistry: Occlusal diseases and posture.

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Khan, Mohd Toseef; Verma, Sanjeev Kumar; Maheshwari, Sandhya; Zahid, Syed Naved; Chaudhary, Prabhat K

2013-01-01

Neuromuscular dentistry has been a controversial topic in the field of dentistry and still remains debatable. The issue of good occlusion and sound health has been repeatedly discussed. Sometimes we get complains of sensitive teeth and sometimes of tired facial muscles on getting up in the morning. Owing to the intimate relation of masticatory apparatus with the cranium and cervico-scapular muscular system, the disorders in any system, draw attention from concerned clinicians involved in management, to develop an integrated treatment protocol for the suffering patients. There may be patients reporting to the dental clinics after an occlusal restoration or extraction, having pain in or around the temporomandibular joint, headache or neck pain. Although their esthetic demands must not be undermined during the course of treatment plan, whenever dental treatment of any sort is planned, occlusion/bite should be given prime importance. Very few dentist are able to diagnose the occlusal disease and of those who diagnose many people resort to aggressive treatment modalities. This paper aims to report the signs of occlusal disease, and discuss their association with TMDs and posture.

Nano Era of Dentistry-An Update.

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Maman, Paramjot; Nagpal, Manju; Gilhotra, Ritu Mehra; Aggarwal, Geeta

2018-02-14

Management of the health of oral tissues is a prime requirement in dentistry. The prevention of tooth decay and the treatment of lesions and cavities are ongoing challenges. The limitations in dental materials, medications, instruments, procedures put off the accomplishment of this goal. Rationalization of science and technology has made possible to work out these limitations. Nanotechnology which is the outcome of this rationalization has become one of the most favored technologies in medical and dental application. The substantial contribution of nano dental materials is the identification of oral health related problems by better diagnosis and management of dental disorders by bionanomaterials. Application of nanodentistry holds promise for comprehensive dental care by utilizing nanomaterials and ultimately by nanorobots. This review discusses the rationale of nanodentistry, nanocarriers researched in treatment of different dental diseases, the latest innovations in nanomaterials in various disciplines of dentistry; patent literature and related marketed products. Advances in nanotechnology have placed plenty of hopes in terms of improving the oral health care of dental patients. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.org.

The use of information and communication technology (ICT) in dentistry.

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Knott, N J

2013-02-01

As the use of information and communication technology (ICT) becomes more widespread in dentistry the risk of breaching electronic commerce laws and patient confidentiality increases. It is necessary to be aware of the responsibilities internet usage entails, especially within a dental practice where the protection of patient information is of the utmost importance. More should be done to outline the various precautions that should be taken to ensure ICT security within the professional domain, as it would appear dentistry has been neglected with regard to receiving the proper ICT education, training and support systems.

[Dr. Atanasije Puljo: pioneer of Serbian dentistry].

Science.gov (United States)

Jovananović, Svetlana; Milovanović, Srdjan; Zagradjanin, Danica; Milovanović, Nebojša; Puzović, Dragana

2012-01-01

This paper describes the life and work of Dr. Atanasije Puljo (1878-1944). He was a volunteer in the Balkan wars, an active participant in the First World War; he was the first who noted the importance of team-work of a dentist and a surgeon in the care of jaw and facial injuries. He established primacy in this field, as he came up with this brilliant idea three years before other colleagues. His method of treatment of the upper jaw neglected fractures, called the Balkan method, was recognized worldwide. Dr. Puljo is the pioneer of dental radiology in Serbia, founder of the Odontology Clinic of the Medical Faculty and main supporter of the establishment of the School of Dentistry. Merits of Dr. Atanasije Puljo, medical practitioner with a broad knowledge in different fields, remain within the academic institution that was founded by this pioneer of dentistry in Serbia.

Impression management and food intake. Current directions in research.

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Vartanian, Lenny R

2015-03-01

This paper reviews recent research on consumption stereotypes (judgments of others based on what they eat) and impression management (modifying one's eating behavior in order to create a particular impression). A major recent focus in the literature has been on masculinity and meat eating, with research showing that meat is strongly associated with masculinity, and that individuals who follow a meat-based diet are perceived as more masculine than are individuals who follow a vegetarian diet. Although direct evidence for impression management through food intake remains sparse, a number of methodological approaches (including priming techniques and ecological valid assessments) are described that could be used in future research to identify the motives underlying people's eating behavior. Consumption stereotypes and impression management may be important influences on people's eating behavior, but the complexities of how, when, and for whom these factors influence food intake are still not well understood. Copyright © 2014 Elsevier Ltd. All rights reserved.

Do first impressions count? Frailty judged by initial clinical impression predicts medium-term mortality in vascular surgical patients.

Science.gov (United States)

O'Neill, B R; Batterham, A M; Hollingsworth, A C; Durrand, J W; Danjoux, G R

2016-06-01

Recognising frailty during pre-operative assessment is important. Frail patients experience higher mortality rates and are less likely to return to baseline functional status following the physiological insult of surgery. We evaluated the association between an initial clinical impression of frailty and all-cause mortality in 392 patients attending our vascular pre-operative assessment clinic. Prevalence of frailty assessed by the initial clinical impression was 30.6% (95% CI 26.0-35.2%). There were 133 deaths in 392 patients over a median follow-up period of 4 years. Using Cox regression, adjusted for age, sex, revised cardiac risk index and surgery (yes/no), the hazard ratio for mortality for frail vs. not-frail was 2.14 (95% CI 1.51-3.05). The time to 20% mortality was 16 months in the frail group and 33 months in the not-frail group. The initial clinical impression is a useful screening tool to identify frail patients in pre-operative assessment. © 2016 The Association of Anaesthetists of Great Britain and Ireland.

The economics of dentistry: a neglected concern.

Science.gov (United States)

Shariati, Batoul; MacEntee, Michael I; Yazdizadeh, Maryam

2013-10-01

Demand for economic evaluations in health care is growing with expectations that they will help to develop regional and national policies on health and social programmes. We present here the scope, quality and content of systematic reviews and meta-analyses relating to the economics of dentistry published over the last 15 years. To review the quality and outcome of systematic reviews and meta-analyses relating to the economics of dental treatments, preventions and services. A systematic search was conducted in 14 electronic databases for systematic reviews and meta-analyses published between January 1997 and July 2011 on the economics of oral disorders and oral health care. Review papers were extracted by two independent investigators to identify the characteristics, results and quality of the reviews and to highlight gaps in knowledge about the economics of dentistry. From 3150 unique references, we found 73 systematic reviews or meta-analyses of dental economics as primary or secondary outcomes. The focus of 12 of them was on the cost or cost-effectiveness of dental prevention, 54 on treatment, five on prevention and treatment and two on delivery of dental services. However, only 12 of the systematic reviews drew conclusions from economic data, and four of them constructed an economic model from synthesized data. Overall, the quality was good in the 12 systematic reviews but poor in the original studies. There is very little helpful data published on the economics of dentistry. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

Digital photoelastic analysis applied to implant dentistry

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Ramesh, K.; Hariprasad, M. P.; Bhuvanewari, S.

2016-12-01

Development of improved designs of implant systems in dentistry have necessitated the study of stress fields in the implant regions of the mandible/maxilla for better understanding of the biomechanics involved. Photoelasticity has been used for various studies related to dental implants in view of whole field visualization of maximum shear stress in the form of isochromatic contours. The potential of digital photoelasticity has not been fully exploited in the field of implant dentistry. In this paper, the fringe field in the vicinity of the connected implants (All-On-Four® concept) is analyzed using recent advances in digital photoelasticity. Initially, a novel 3-D photoelastic model making procedure, to closely mimic all the anatomical features of the human mandible is proposed. By choosing appropriate orientation of the model with respect to the light path, the essential region of interest were sought to be analysed while keeping the model under live loading conditions. Need for a sophisticated software module to carefully identify the model domain has been brought out. For data extraction, five-step method is used and isochromatics are evaluated by twelve fringe photoelasticity. In addition to the isochromatic fringe field, whole field isoclinic data is also obtained for the first time in implant dentistry, which could throw important information in improving the structural stability of the implant systems. Analysis is carried out for the implant in the molar as well as the incisor region. In addition, the interaction effects of loaded molar implant on the incisor area are also studied.

Recent advancements in regenerative dentistry: A review.

Science.gov (United States)

Amrollahi, Pouya; Shah, Brinda; Seifi, Amir; Tayebi, Lobat

2016-12-01

Although human mouth benefits from remarkable mechanical properties, it is very susceptible to traumatic damages, exposure to microbial attacks, and congenital maladies. Since the human dentition plays a crucial role in mastication, phonation and esthetics, finding promising and more efficient strategies to reestablish its functionality in the event of disruption has been important. Dating back to antiquity, conventional dentistry has been offering evacuation, restoration, and replacement of the diseased dental tissue. However, due to the limited ability and short lifespan of traditional restorative solutions, scientists have taken advantage of current advancements in medicine to create better solutions for the oral health field and have coined it "regenerative dentistry." This new field takes advantage of the recent innovations in stem cell research, cellular and molecular biology, tissue engineering, and materials science etc. In this review, the recently known resources and approaches used for regeneration of dental and oral tissues were evaluated using the databases of Scopus and Web of Science. Scientists have used a wide range of biomaterials and scaffolds (artificial and natural), genes (with viral and non-viral vectors), stem cells (isolated from deciduous teeth, dental pulp, periodontal ligament, adipose tissue, salivary glands, and dental follicle) and growth factors (used for stimulating cell differentiation) in order to apply tissue engineering approaches to dentistry. Although they have been successful in preclinical and clinical partial regeneration of dental tissues, whole-tooth engineering still seems to be far-fetched, unless certain shortcomings are addressed. Copyright © 2016 Elsevier B.V. All rights reserved.

Universal adhesives: the next evolution in adhesive dentistry?

Science.gov (United States)

Alex, Gary

2015-01-01

Every so often a new material, technique, or technological breakthrough spurs a paradigm shift in the way dentistry is practiced. The development and evolution of reliable enamel and dentin bonding agents is one such example. Indeed, the so-called "cosmetic revolution" in dentistry blossomed in large part due to dramatic advances in adhesive technology. It is the ability to bond various materials in a reasonably predictable fashion to both enamel and dentin substrates that enables dentists to routinely place porcelain veneers, direct and indirect composites, and a plethora of other restorative and esthetic materials. In fact, the longevity and predictability of many (if not most) current restorative procedures is wholly predicated on the dentist's ability to bond various materials to tooth tissues. Adhesive systems have progressed from the largely ineffective systems of the 1970s and early 1980s to the relatively successful total- and self-etching systems of today. The latest players in the adhesive marketplace are the so-called "universal adhesives." In theory, these systems have the potential to significantly simplify and expedite adhesive protocols and may indeed represent the next evolution in adhesive dentistry. But what defines a universal system, and are all these new systems truly "universal" and everything they are claimed to be? This article will examine the origin, chemistry, strengths, weaknesses, and clinical relevance of this new genre of dental adhesives.

Disinfection of Dental Impressions Prior to Handling at Muhimbili ...

African Journals Online (AJOL)

All four dental technicians who handled the received impressions were interviewed. Questions asked were on practice and attitudes and responses were on different point scales. Results are based on information gathered from the dental technicians. Results: Of the 1,453 impressions received none were reported to have ...

Quantitative and Qualitative Evaluation of Iranian Researchers' Scientific Production in Dentistry Subfields.

Science.gov (United States)

Yaminfirooz, Mousa; Motallebnejad, Mina; Gholinia, Hemmat; Esbakian, Somayeh

2015-10-01

As in other fields of medicine, scientific production in the field of dentistry has significant placement. This study aimed at quantitatively and qualitatively evaluating Iranian researchers' scientific output in the field of dentistry and determining their contribution in each of dentistry subfields and branches. This research was a scientometric study that applied quantitative and qualitative indices of Web of Science (WoS). Research population consisted of927indexed documents published under the name of Iran in the time span of 1993-2012 which were extracted from WoS on 10 March 2013. The Mann-Whitney test and Pearson correlation coefficient were used to data analyses in SPSS 19. 777 (83. 73%) of indexed items of all scientific output in WoS were scientific articles. The highest growth rate of scientific productionwith90% belonged to endodontic sub field. The correlation coefficient test showed that there was a significant positive relationship between the number of documents and their publication age (P scientific production in various subfields of dentistry were very different. It needs to reinforce the infrastructure for more balanced scientific production in the field and its related subfields.

Quantitative and Qualitative Evaluation of Iranian Researchers’ Scientific Production in Dentistry Subfields

Science.gov (United States)

Yaminfirooz, Mousa; Motallebnejad, Mina; Gholinia, Hemmat; Esbakian, Somayeh

2015-01-01

Background: As in other fields of medicine, scientific production in the field of dentistry has significant placement. This study aimed at quantitatively and qualitatively evaluating Iranian researchers’ scientific output in the field of dentistry and determining their contribution in each of dentistry subfields and branches. Methods: This research was a scientometric study that applied quantitative and qualitative indices of Web of Science (WoS). Research population consisted of927indexed documents published under the name of Iran in the time span of 1993-2012 which were extracted from WoS on 10 March 2013. The Mann-Whitney test and Pearson correlation coefficient were used to data analyses in SPSS 19. Results: 777 (83. 73%) of indexed items of all scientific output in WoS were scientific articles. The highest growth rate of scientific productionwith90% belonged to endodontic sub field. The correlation coefficient test showed that there was a significant positive relationship between the number of documents and their publication age (P dentistry were very different. It needs to reinforce the infrastructure for more balanced scientific production in the field and its related subfields. PMID:26635439

Impression management within the Zulu culture: Exploring tactics in the work context

Directory of Open Access Journals (Sweden)

Debrah Mtshelwane

2016-08-01

Full Text Available Orientation: Impression management tactics are utilised differently by people depending on the situation and the others around them. Research purpose: The purpose of the study was to identify the impression management tactics Zulu people display when they want to impress people in a work context. Motivation for this study: Organisations are competing for talented employees and people who contribute to the return on investment for the organisation. Individuals display impression tactics to influence the perceptions of others in the workplace, especially pertaining to performance appraisals and promotional opportunities. Research approach, design and method: The social constructivism paradigm was employed in conducting this study, following a phenomenological approach. The research sample consisted of 30 Zulu-speaking individuals from various organisations who were interviewed through semi-structured interviews. The researcher used thematic analysis to analyse the data. Main findings: The main findings in this study included impression management tactics that are used by Zulu people when attempting to impress people in the work context. The findings were divided into different categories (colleagues and supervisor. Conscientiousness,interpersonal amiability, openness and relational action are the themes that were reported as the most common impression management features people display at their workplace with colleagues. Themes that were reported when impressing a supervisor include conscientiousness,integrity, relational action and skilfulness. Practical/managerial implications: This study provides organisations with knowledge on the impression management tactics utilised by isiZulu employees. The nature of this information enables management to not misinterpret the use of certain tactics and will lead to more understanding and resilience by organisations and colleagues when working with isiZulu individuals. Contribution/value-add: This study

Dimensional Stability of Two Polyvinyl Siloxane Impression Materials in Different Time Intervals

Directory of Open Access Journals (Sweden)

Aalaei Sh

2015-12-01

Full Text Available Statement of the Problem: Dental prosthesis is usually made indirectly; there- fore dimensional stability of the impression material is very important. Every few years, new impression materials with different manufacturers’ claims regarding their better properties are introduced to the dental markets which require more research to evaluate their true dimensional changes. Objectives: The aim of this study was to evaluate dimensional stability of additional silicone impression material (Panasil® and Affinis® in different time intervals. Materials and Methods: In this experimental study, using two additional silicones (Panasil® and Affinis®, we made sixty impressions of standard die in similar conditions of 23 °C and 59% relative humidity by a special tray. The die included three horizontal and two vertical lines that were parallel. The vertical line crossed the horizontal ones at a point that served as reference for measurement. All impressions were poured with high strength dental stone. The dimensions were measured by stereo-microscope by two examiners in three interval storage times (1, 24 and 168 hours.The data were statistically analyzed using t-test and ANOVA. Results: All of the stone casts were larger than the standard die. Dimensional changes of Panasil and Affinis were 0.07%, 0.24%, 0.27% and 0.02%, 0.07%, 0.16% after 1, 24 and 168 hours, respectively. Dimensional change for two impression materials wasn’t significant in the interval time, expect for Panasil after one week (p = 0.004. Conclusions: According to the limitations of this study, Affinis impressions were dimensionally more stable than Panasil ones, but it was not significant. Dimensional change of Panasil impression showed a statistically significant difference after one week. Dimensional changes of both impression materials were based on ADA standard limitation in all time intervals (< 0.5%; therefore, dimensional stability of this impression was accepted at least

Accuracy of the One-Stage and Two-Stage Impression Techniques: A Comparative Analysis.

Science.gov (United States)

Jamshidy, Ladan; Mozaffari, Hamid Reza; Faraji, Payam; Sharifi, Roohollah

2016-01-01

Introduction . One of the main steps of impression is the selection and preparation of an appropriate tray. Hence, the present study aimed to analyze and compare the accuracy of one- and two-stage impression techniques. Materials and Methods . A resin laboratory-made model, as the first molar, was prepared by standard method for full crowns with processed preparation finish line of 1 mm depth and convergence angle of 3-4°. Impression was made 20 times with one-stage technique and 20 times with two-stage technique using an appropriate tray. To measure the marginal gap, the distance between the restoration margin and preparation finish line of plaster dies was vertically determined in mid mesial, distal, buccal, and lingual (MDBL) regions by a stereomicroscope using a standard method. Results . The results of independent test showed that the mean value of the marginal gap obtained by one-stage impression technique was higher than that of two-stage impression technique. Further, there was no significant difference between one- and two-stage impression techniques in mid buccal region, but a significant difference was reported between the two impression techniques in MDL regions and in general. Conclusion . The findings of the present study indicated higher accuracy for two-stage impression technique than for the one-stage impression technique.

A metric study of insole foot impressions in footwear of identical twins.

Science.gov (United States)

Nirenberg, Michael S; Krishan, Kewal; Kanchan, Tanuj

2017-11-01

Foot impressions are of utmost importance in crime scene investigations. Foot impressions are available in the form of barefoot prints, sock-clad footprints, and as impressions within footwear. Sometimes suspects leave their footwear at the crime scene, and the insole of this footwear may contain the foot impression of the suspect which may be important evidence linking him or her to the crime. The task of identification based on the analysis of footprints can be challenging when the footprints belonging to one of the identical twin is available for examination. The present study is based on the quantitative measures of the foot impressions in the footwear of adult identical twins. The study was conducted on four sets of female monozygotic twins from the United States of America. A total of 17 length and breadth measurements were taken on each foot impression. A combination of Reel Method and Extended Gunn Method was utilized to produce the measurements. The measurements of the foot impressions were compared among the twins on the right and the left side. Differences were found in the various footprint measurements among the twins. The study's sample size was not large enough to apply robust statistical tests, but the study is significant in that it presents the first detailed comparative analysis of a large number of measurements of insole foot impressions of adult twins. The observations derived from the study are likely to assist forensic investigations in cases involving the foot impressions of the twins. Copyright © 2017 Elsevier Ltd and Faculty of Forensic and Legal Medicine. All rights reserved.

Precision of guided scanning procedures for full-arch digital impressions in vivo.

Science.gov (United States)

Zimmermann, Moritz; Koller, Christina; Rumetsch, Moritz; Ender, Andreas; Mehl, Albert

2017-11-01

System-specific scanning strategies have been shown to influence the accuracy of full-arch digital impressions. Special guided scanning procedures have been implemented for specific intraoral scanning systems with special regard to the digital orthodontic workflow. The aim of this study was to evaluate the precision of guided scanning procedures compared to conventional impression techniques in vivo. Two intraoral scanning systems with implemented full-arch guided scanning procedures (Cerec Omnicam Ortho; Ormco Lythos) were included along with one conventional impression technique with irreversible hydrocolloid material (alginate). Full-arch impressions were taken three times each from 5 participants (n = 15). Impressions were then compared within the test groups using a point-to-surface distance method after best-fit model matching (OraCheck). Precision was calculated using the (90-10%)/2 quantile and statistical analysis with one-way repeated measures ANOVA and post hoc Bonferroni test was performed. The conventional impression technique with alginate showed the lowest precision for full-arch impressions with 162.2 ± 71.3 µm. Both guided scanning procedures performed statistically significantly better than the conventional impression technique (p Cerec Omnicam Ortho were 74.5 ± 39.2 µm and for group Ormco Lythos 91.4 ± 48.8 µm. The in vivo precision of guided scanning procedures exceeds conventional impression techniques with the irreversible hydrocolloid material alginate. Guided scanning procedures may be highly promising for clinical applications, especially for digital orthodontic workflows.

Impression Procedures for Metal Frame Removable Partial Dentures as Applied by General Dental Practitioners.

Science.gov (United States)

Fokkinga, Wietske A; van Uchelen, Judith; Witter, Dick J; Mulder, Jan; Creugers, Nico H J

2016-01-01

This pilot study analyzed impression procedures for conventional metal frame removable partial dentures (RPDs). Heads of RPD departments of three dental laboratories were asked to record features of all incoming impressions for RPDs during a 2-month period. Records included: (1) impression procedure, tray type (stock/custom), impression material (elastomer/alginate), use of border-molding material (yes/no); and (2) RPD type requested (distal-extension/tooth-bounded/combination). Of the 132 total RPD impressions, 111 (84%) involved custom trays, of which 73 (55%) were combined with an elastomer. Impression border-molding material was used in 4% of the cases. Associations between impression procedure and RPD type or dentists' year/university of graduation were not found.

The safety of bone allografts used in dentistry: a review.

Science.gov (United States)

Holtzclaw, Dan; Toscano, Nicholas; Eisenlohr, Lisa; Callan, Don

2008-09-01

Recent media reports concerning "stolen body parts" have shaken the public's trust in the safety of and the use of ethical practices involving human allografts. The authors provide a comprehensive review of the safety aspects of human bone allografts. The authors reviewed U.S. government regulations, industry standards, independent industry association guidelines, company guidelines and scientific articles related to the use of human bone allografts in the practice of dentistry published in the English language. The use of human bone allografts in the practice of dentistry involves the steps of procurement, processing, use and tracking. Rigorous donor screening and aseptic proprietary processing programs have rendered the use of human bone allografts safe and effective as a treatment option. When purchasing human bone allografts for the practice of dentistry, one should choose products accredited by the American Association of Tissue Banks for meeting uniformly high safety and quality control measures. Knowledge of human bone allograft procurement, processing, use and tracking procedures may allow dental clinicians to better educate their patients and address concerns about this valuable treatment option.

Functional Impressions in Complete Denture and Overdenture Treatment

OpenAIRE

Hrvoje Kršek; Nikša Dulčić

2015-01-01

Tooth loss can cause loss of occlusal, masticatory, esthetic, physiognomic, phonetic and psychosocial function of patients. The most frequently used treatment method of completely edentulous patients and patients with a small number of remaining teeth are complete dentures or overdentures. One of the most important clinical and laboratory procedures in their fabrication is functional impression taking. The aim of this paper was to present procedures of taking functional impressions in fab...

Magnets in dentistry

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Vidya S Bhat

2013-01-01

Full Text Available Magnets have generated great interest within dentistry. They have been used for various applications in orthodontics and prosthodontics. Earlier use of magnets was limited due to the unavailability of small size magnets, but after the introduction of rare earth magnets and their availability in smaller sizes, their use has increased considerably. They can be placed within prostheses without being obtrusive in the mouth. Their main use in orthodontics has been for tooth movement and in prosthodontics has been in maxillofacial prosthesis and in overdentures as retentive aids. This article reviews the types of magnets available and their application in maxillofacial prosthesis and overdentures, followed by other advantages and disadvantages.

Evaluation of oral scanning in comparison to impression using three-dimensional registration

Science.gov (United States)

Brogle-Kim, Yur-Chung; Deyhle, Hans; Müller, Bert; Schulz, Georg; Bormann, Therese; Beckmann, Felix; Jäger, Kurt

2012-10-01

Crown and bridge restorations are one of the main treatment methods in fixed prosthodontics. The fabrication requires data on the patient's denture shape. This information is generally obtained as a hard copy from an impression mold. Alternatively, one can acquire the data electronically using oral optical three-dimensional (3D) imaging techniques, which determine the surface of the denture. The aim of the study was to quantitatively compare the accuracy of three dimensional scanning with that of conventional impressions and give a statement how far the scanner provides a clinical alternative with equal or better precision. Data from 10 teeth were acquired in the dental office with a polyether impression material and an oral scanner. Data from the impressions were digitalized by means of micro computed tomography. The data were then 3D registered to identify the potential differences between impression and optical scan. We could demonstrate that the oral scanner's data and the conventional impressions are comparable.

Code of practice for radiological protection in dentistry

International Nuclear Information System (INIS)

1988-01-01

This Code of Practice applies to all those involved in the practice of dentistry and is designed to minimise radiation doses to patients, dental staff and the public from the use of dental radiographic equipment

Interpretation of appearance: the effect of facial features on first impressions and personality

DEFF Research Database (Denmark)

Wolffhechel, Karin Marie Brandt; Fagertun, Jens; Jacobsen, Ulrik Plesner

2014-01-01

Appearance is known to influence social interactions, which in turn could potentially influence personality development. In this study we focus on discovering the relationship between self-reported personality traits, first impressions and facial characteristics. The results reveal that several...... personality traits can be read above chance from a face, and that facial features influence first impressions. Despite the former, our prediction model fails to reliably infer personality traits from either facial features or first impressions. First impressions, however, could be inferred more reliably from...... facial features. We have generated artificial, extreme faces visualising the characteristics having an effect on first impressions for several traits. Conclusively, we find a relationship between first impressions, some personality traits and facial features and consolidate that people on average assess...

Perceived competency towards preventive dentistry among dental ...

African Journals Online (AJOL)

Background: A previous study has shown that dental practitioners in Benghazi believed that the less prevention-oriented education system is one of the barriers to applying preventive dentistry. Objective: To assess attitudes and perceived competence of the dental graduates in Benghazi towards prevention and early ...

Nanotechnology in dentistry: prevention, diagnosis, and therapy.

Science.gov (United States)

Abou Neel, Ensanya Ali; Bozec, Laurent; Perez, Roman A; Kim, Hae-Won; Knowles, Jonathan C

2015-01-01

Nanotechnology has rapidly expanded into all areas of science; it offers significant alternative ways to solve scientific and medical questions and problems. In dentistry, nanotechnology has been exploited in the development of restorative materials with some significant success. This review discusses nanointerfaces that could compromise the longevity of dental restorations, and how nanotechnolgy has been employed to modify them for providing long-term successful restorations. It also focuses on some challenging areas in dentistry, eg, oral biofilm and cancers, and how nanotechnology overcomes these challenges. The recent advances in nanodentistry and innovations in oral health-related diagnostic, preventive, and therapeutic methods required to maintain and obtain perfect oral health, have been discussed. The recent advances in nanotechnology could hold promise in bringing a paradigm shift in dental field. Although there are numerous complex therapies being developed to treat many diseases, their clinical use requires careful consideration of the expense of synthesis and implementation.

Nanotechnology in dentistry: prevention, diagnosis, and therapy

Science.gov (United States)

Abou Neel, Ensanya Ali; Bozec, Laurent; Perez, Roman A; Kim, Hae-Won; Knowles, Jonathan C

2015-01-01

Nanotechnology has rapidly expanded into all areas of science; it offers significant alternative ways to solve scientific and medical questions and problems. In dentistry, nanotechnology has been exploited in the development of restorative materials with some significant success. This review discusses nanointerfaces that could compromise the longevity of dental restorations, and how nanotechnolgy has been employed to modify them for providing long-term successful restorations. It also focuses on some challenging areas in dentistry, eg, oral biofilm and cancers, and how nanotechnology overcomes these challenges. The recent advances in nanodentistry and innovations in oral health-related diagnostic, preventive, and therapeutic methods required to maintain and obtain perfect oral health, have been discussed. The recent advances in nanotechnology could hold promise in bringing a paradigm shift in dental field. Although there are numerous complex therapies being developed to treat many diseases, their clinical use requires careful consideration of the expense of synthesis and implementation. PMID:26504385

Direct reimbursement. The future for organized dentistry.

Science.gov (United States)

Paul, D P

2001-10-01

Direct reimbursement, or DR, has been a popular topic in organized dentistry for much of the last decade, and the concept is beginning to be more widely known. This article explores the underpinnings of and future for DR. TYPES OF LITERATURE REVIEWED: This article is based on an online review of the dental, medical and business literature. The author explores the advantages of DR for patients, employers and dentists. He also presents purported disadvantages of DR, and refutes them. Organized dentistry's marketing efforts and the importance of third-party administrators also are examined. During the next several years, DR has the potential to become the vehicle of choice for financing much of the dental care provided in the United States. Dentists need to become more aware of what DR is and what it can offer the public. They then will be better able to promote DR, which is a significantly better payment system for dental care than any other available today.

Organized dentistry as an agent for helping others: the leadership of Donna J. Rumberger.

Science.gov (United States)

Rule, James T; Bebeau, Muriel J

2003-09-01

Dr Donna Rumberger graduated from New York University College of Dentistry in 1980 and has practiced dentistry in Manhattan ever since. Even before her graduation, she was active in organized dentistry, always viewing it as a conduit for helping other people. Working with the American Association of Women Dentists, she was cofounder of the Smiles for Success Foundation, a program started in New York City that helps women advance from welfare into the workforce with restored, healthy smiles. That program now has expanded to 14 other cities. Working with organized dentistry in New York City, she has been instrumental in initiating and running the Skate Safe program, which provides mouthguards and oral home care education for inner city children in Harlem. In addition, she has worked with the dentistry merit badge program for the Boy Scouts of America Jamborees, helped coalesce women's dental organizations in New York City, and led her dental society to collaborate with Columbia University in a program to improve access to dental care. As further evidence of her ability to get things done, she also has served as president of the American Association of Women Dentists, the Midtown Dental Society, and the New York County Dental Society--one of the largest dental societies in the country.

Collection of Wet-Origin Footwear Impressions on Various Surfaces Using an Electrostatic Dust Print Lifter.

Science.gov (United States)

Hong, Sungwook; Park, Miseon

2018-01-19

Electrostatic dust print lift method is known to be able to recover only dry-origin footwear impression. However, the wet-origin footwear impression could also be recovered using this method. As the amount of dust accumulated before deposition of the wet-origin footwear impression increased, the intensity of the footwear impression lifted with this method became stronger. If the footwear impression is not affected by moisture after it is made, the 28-h old wet-origin footwear impression could be recovered using this method. The intensity of the lifted footwear impression did not decrease significantly even when the number of sequential steps increased as long as the shoe sole is wet. However, when the moisture on the shoe sole depleted, the intensity of the footwear impression decreased sharply. This method has the advantage of being able to enhance the footwear impression without being affected by the footwear impressions deposited in the past. © 2018 American Academy of Forensic Sciences.

Three-dimensional accuracy of a digitally coded healing abutment implant impression system.

Science.gov (United States)

Ng, Simon D; Tan, Keson B; Teoh, K H; Cheng, Ansgar C; Nicholls, Jack I

2014-01-01

This study examined the three-dimensional (3D) accuracy of the Encode Impression System (EN) in transferring the locations of two implants from master models to test models and compared this to the direct impression (DI) technique. The effect of interimplant angulation on the 3D accuracy of both impression techniques was also evaluated. Seven sectional polymethyl methacrylate mandibular arch master models were fabricated with implants in the first premolar and first molar positions. The implants were placed parallel to each other or angulated mesiodistally or buccolingually with total divergent angles of 10, 20, or 30 degrees. Each master model was secured onto an aluminum block containing a gauge block, which defined the local coordinate references. Encode healing abutments were attached to the implants before impressions were made for the EN test models; pickup impression copings were attached for the DI test models. For the seven test groups of each impression technique, a total of 70 test models were fabricated (n = 5). The EN test models were sent to Biomet 3i for implant analog placement. The centroid of each implant or implant analog and the angular orientation of the long axis relative to the x- and y-axes were measured with a coordinate measuring machine. Statistical analyses were performed. Impression technique had a significant effect on y distortion, global linear distortion, and absolute xz and yz angular distortions. Interimplant angulation had significant effects on x and y distortions. However, neither impression technique nor interimplant angulation had a significant effect on z distortion. Distortions were observed with both impression techniques. However, the results suggest that EN was less accurate than DI.

Accuracy of the One-Stage and Two-Stage Impression Techniques: A Comparative Analysis

Directory of Open Access Journals (Sweden)

Ladan Jamshidy

2016-01-01

Full Text Available Introduction. One of the main steps of impression is the selection and preparation of an appropriate tray. Hence, the present study aimed to analyze and compare the accuracy of one- and two-stage impression techniques. Materials and Methods. A resin laboratory-made model, as the first molar, was prepared by standard method for full crowns with processed preparation finish line of 1 mm depth and convergence angle of 3-4°. Impression was made 20 times with one-stage technique and 20 times with two-stage technique using an appropriate tray. To measure the marginal gap, the distance between the restoration margin and preparation finish line of plaster dies was vertically determined in mid mesial, distal, buccal, and lingual (MDBL regions by a stereomicroscope using a standard method. Results. The results of independent test showed that the mean value of the marginal gap obtained by one-stage impression technique was higher than that of two-stage impression technique. Further, there was no significant difference between one- and two-stage impression techniques in mid buccal region, but a significant difference was reported between the two impression techniques in MDL regions and in general. Conclusion. The findings of the present study indicated higher accuracy for two-stage impression technique than for the one-stage impression technique.

A study of Knowledge, Attitude and Self-Assessment of Residents on Evidence-Based Dentistry at Faculty of Dentistry of Tabriz University of Medical Sciences

Directory of Open Access Journals (Sweden)

Maryam Pourkazemi

2016-06-01

Full Text Available Introduction: Evidence-based dentistry is the combination of individual clinical experiences withthe highest-quality evidence available as the result of systematic studies.Evidence-based dentistryis an approach in which the clinician uses the best evidence available to make the most appropriatedecision for the patient. In this descriptive study, the knowledge, attitude and self-assessment ofTabriz dental school residents were examined on evidence-based dentistry in the academic year2014-2015. Methods: All residents of Tabriz Dentistry Faculty (100 in total were enrolled in the study.Thedata collection tool was a questionnaire, and the validity of the questionnaire was determined inprevious studies. To determine the reliability of the questionnaire, it was distributed among the20 residents ina pilot study. Descriptive statistical methods were used to study the data obtained.Chi-square, t-test, and Kruskal-Wallis tests were used to assess the relationship between variablesusing SPSS 20. Results: The results showed that the level of residents’ knowledge on evidence-based dentistrywas moderate and 94.4% of residents had a positive attitude toward EBD. The highest and lowestself-assessments were related to the terms PubMed and Cochrane Collaboration (CI=29.27-30.73,CI=42.06-43.32 CI=28.69-31.09with 95%confidence interval, respectively. Conclusion: Given the increasing importance of evidence-based dentistry and considering themoderate knowledge of the residents on the topic, a need is felt for proper planning to teach itat Tabriz University of Medical Sciences. Considering dentists’ positive attitude toward EBD, Itseems that there is an appropriate background for EBD education in the country

In vivo evaluation of inter-operator reproducibility of digital dental and conventional impression techniques.

Directory of Open Access Journals (Sweden)

Emi Kamimura

Full Text Available The aim of this study was to evaluate and compare the inter-operator reproducibility of three-dimensional (3D images of teeth captured by a digital impression technique to a conventional impression technique in vivo.Twelve participants with complete natural dentition were included in this study. A digital impression of the mandibular molars of these participants was made by two operators with different levels of clinical experience, 3 or 16 years, using an intra-oral scanner (Lava COS, 3M ESPE. A silicone impression also was made by the same operators using the double mix impression technique (Imprint3, 3M ESPE. Stereolithography (STL data were directly exported from the Lava COS system, while STL data of a plaster model made from silicone impression were captured by a three-dimensional (3D laboratory scanner (D810, 3shape. The STL datasets recorded by two different operators were compared using 3D evaluation software and superimposed using the best-fit-algorithm method (least-squares method, PolyWorks, InnovMetric Software for each impression technique. Inter-operator reproducibility as evaluated by average discrepancies of corresponding 3D data was compared between the two techniques (Wilcoxon signed-rank test.The visual inspection of superimposed datasets revealed that discrepancies between repeated digital impression were smaller than observed with silicone impression. Confirmation was forthcoming from statistical analysis revealing significantly smaller average inter-operator reproducibility using a digital impression technique (0.014± 0.02 mm than when using a conventional impression technique (0.023 ± 0.01 mm.The results of this in vivo study suggest that inter-operator reproducibility with a digital impression technique may be better than that of a conventional impression technique and is independent of the clinical experience of the operator.

In vivo evaluation of inter-operator reproducibility of digital dental and conventional impression techniques

Science.gov (United States)

Kamimura, Emi; Tanaka, Shinpei; Takaba, Masayuki; Tachi, Keita; Baba, Kazuyoshi

2017-01-01

Purpose The aim of this study was to evaluate and compare the inter-operator reproducibility of three-dimensional (3D) images of teeth captured by a digital impression technique to a conventional impression technique in vivo. Materials and methods Twelve participants with complete natural dentition were included in this study. A digital impression of the mandibular molars of these participants was made by two operators with different levels of clinical experience, 3 or 16 years, using an intra-oral scanner (Lava COS, 3M ESPE). A silicone impression also was made by the same operators using the double mix impression technique (Imprint3, 3M ESPE). Stereolithography (STL) data were directly exported from the Lava COS system, while STL data of a plaster model made from silicone impression were captured by a three-dimensional (3D) laboratory scanner (D810, 3shape). The STL datasets recorded by two different operators were compared using 3D evaluation software and superimposed using the best-fit-algorithm method (least-squares method, PolyWorks, InnovMetric Software) for each impression technique. Inter-operator reproducibility as evaluated by average discrepancies of corresponding 3D data was compared between the two techniques (Wilcoxon signed-rank test). Results The visual inspection of superimposed datasets revealed that discrepancies between repeated digital impression were smaller than observed with silicone impression. Confirmation was forthcoming from statistical analysis revealing significantly smaller average inter-operator reproducibility using a digital impression technique (0.014± 0.02 mm) than when using a conventional impression technique (0.023 ± 0.01 mm). Conclusion The results of this in vivo study suggest that inter-operator reproducibility with a digital impression technique may be better than that of a conventional impression technique and is independent of the clinical experience of the operator. PMID:28636642

Developing the Perfect Pitch: Creating a Positive First Impression through Social Media

Science.gov (United States)

Edmiston, Dawn

2016-01-01

Too often we take for granted first impressions and how others perceive us, but such perceptions frequently form the basis for personal and professional success. Today, many first impressions are made online through search engine results and social networks. To ensure that students make a positive first impression, this teaching innovation…

Brazilian scientific production on herbal medicines used in dentistry

Directory of Open Access Journals (Sweden)

R.D. Castro

2014-09-01

Full Text Available The objective of this study was to critically analyze the scientific production published in specialized Brazilian journals concerning the use of medicinal plants in dentistry. A literature review was carried out using an indirect documentation technique by means of a bibliographical study. Four examiners performed independent searches in Brazilian journals of medicinal plants indexed in the database SciELO (Brazilian Journal of Pharmacognosy; Brazilian Journal of Medicinal Plants; Brazilian Journal of Pharmaceutical Sciences; and Acta Botanica Brasilica using the descriptors "herbal medicine/phytotherapy" or "medicinal plants" and "dentistry ". The articles published from 2002 to 2012 addressing the use of medicinal plants in dentistry were included and analyzed. The searches based on the descriptors and reading of abstracts, resulted in 155 articles. Of these, 44 were read in full and a total of 16 publications met the eligibility criteria and were selected. Laboratory studies predominated (10 and were limited to the evaluation of antimicrobial properties by means of tests for determining inhibitory, fungicidal and bactericidal concentrations. Three literature reviews and only one clinical trial with no blinding and randomization were found. It is highlighted the need for better methodological designs in the researches and greater production of clinical or in vivo studies.

An Assessment of the Risk of Bias in Randomized Controlled Trial Reports Published in Prosthodontic and Implant Dentistry Journals.

Science.gov (United States)

Papageorgiou, Spyridon N; Kloukos, Dimitrios; Petridis, Haralampos; Pandis, Nikolaos

2015-01-01

The objective of this study was to assess the risk of bias of randomized controlled trials (RCTs) published in prosthodontic and implant dentistry journals. The last 30 issues of 9 journals in the field of prosthodontic and implant dentistry (Clinical Implant Dentistry and Related Research, Clinical Oral Implants Research, Implant Dentistry, International Journal of Oral & Maxillofacial Implants, International Journal of Periodontics and Restorative Dentistry, International Journal of Prosthodontics, Journal of Dentistry, Journal of Oral Rehabilitation, and Journal of Prosthetic Dentistry) were hand-searched for RCTs. Risk of bias was assessed using the Cochrane Collaboration's risk of bias tool and analyzed descriptively. From the 3,667 articles screened, a total of 147 RCTs were identified and included. The number of published RCTs increased with time. The overall distribution of a high risk of bias assessment varied across the domains of the Cochrane risk of bias tool: 8% for random sequence generation, 18% for allocation concealment, 41% for masking, 47% for blinding of outcome assessment, 7% for incomplete outcome data, 12% for selective reporting, and 41% for other biases. The distribution of high risk of bias for RCTs published in the selected prosthodontic and implant dentistry journals varied among journals and ranged from 8% to 47%, which can be considered as substantial.

Social desirability scales as indicators of self-enhancement and impression management.