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Sample records for supernumerary minute ring

  1. Minute supernumerary ring chromosome 22 associated with cat eye syndrome: further delineation of the critical region.

    Science.gov (United States)

    Mears, A J; el-Shanti, H; Murray, J C; McDermid, H E; Patil, S R

    1995-09-01

    Cat eye syndrome (CES) is typically associated with a supernumerary bisatellited marker chromosome (inv dup 22pter-22q11.2) resulting in four copies of this region. We describe an individual showing the inheritance of a minute supernumerary double ring chromosome 22, which resulted in expression of all cardinal features of CES. The size of the ring was determined by DNA dosage analysis and FISH analysis for five loci mapping to 22q11.2. The probes to the loci D22S9, D22S43, and ATP6E were present in four copies, whereas D22S57 and D22S181 were present in two copies. This finding further delineates the distal boundary of the critical region of CES, with ATP6E being the most distal duplicated locus identified. The phenotypically normal father and grandfather of the patient each had a small supernumerary ring chromosome and demonstrated three copies for the loci D22S9, D22S43, and ATP6E. Although three copies of this region have been reported in other cases with CES features, it is possible that the presence of four copies leads to greater susceptibility.

  2. Supernumerary ring chromosome 20 characterized by fluorescence in situ hybridization

    NARCIS (Netherlands)

    Van Langen, Irene M.; Otter, Mariëlle A.; Aronson, Daniël C.; Overweg-Plandsoen, W.C.G.; Hennekam, Raoul C.M.; Leschot, Nico J.; Hoovers, Jan M.N.

    1996-01-01

    We report on a boy with mild dysmorphic features and developmental delay, in whom karyotyping showed an additional minute ring chromosome in 60% of metaphases. Fluorescence in situ hybridization (FISH) with a centromere specific probe demonstrated that the ring chromosome contained the centromeric

  3. Molecular cytogenetic characterization of a small, familial supernumerary ring chromosome 7 associated with mental retardation and an abnormal phenotype

    NARCIS (Netherlands)

    Tan-Sindhunata, G; Castedo, S; Leegte, B; Mulder, [No Value; van der Veen, AYV; van der Hout, AHV; van Essen, AJ

    2000-01-01

    A family is described in which a mother and two of her children were mosaic for a small supernumerary ring chromosome. As the origin of the ring chromosome could not be determined by routine cytogenetic studies, fluorescent in situ hybridization was performed, which indicated that the ring

  4. Clinical and molecular cytogenetic studies in a case with partial trisomy 12p due to a de novo supernumerary ring chromosome.

    NARCIS (Netherlands)

    Ausems, M.G.E.M.; Schuil, J.; Ravenswaaij-Arts, C.M.A. van; Pater, J.M. de

    2004-01-01

    Clinical and molecular cytogenetic studies in a case with partial trisomy 12p due to a de novo supernumerary ring chromosome: We report on a girl with a mosaic karyotype containing a supernumerary ring chromosome. Fluorescence in situ hybridization (FISH) studies showed that this marker chromosome

  5. Low grade mosaic for a complex supernumerary ring chromosome 18 in an adult patient with multiple congenital anomalies

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    Hoogeboom A Jeannette M

    2010-07-01

    Full Text Available Abstract Background Several cases have been reported of patients with a ring chromosome 18 replacing one of the normal chromosomes 18. Less common are patients with a supernumerary ring chromosomes 18. High resolution whole genome examination in patients with multiple congenital abnormalities might reveal cytogenetic abnormalities of an unexpected complexity. Results We report a 24 years old male patient with lower spinal anomalies, hypospadia, bifid scrotum, cryptorchism, anal atresia, kidney stones, urethra anomalies, radial dysplasia, and a hypoplastic thumb. Some of the anomalies overlap with the VACTERL association. Chromosome analysis of cultured peripheral blood lymphocytes revealed an additional ring chromosome in 13% of the metaphases. Both parents had a normal karyotype, demonstrating the de novo origin of this ring chromosome. FISH analysis using whole chromosome paints showed that the additional chromosomal material was derived from chromosome 18. Chromosome analysis of cultured fibroblasts revealed only one cell with the supernumerary ring chromosome in the 400 analyzed. To characterize the ring chromosome in more detail peripheral blood derived DNA was analyzed using SNP-arrays. The array results indicated a 5 Mb gain of the pericentromeric region of chromosome 18q10-q11.2. FISH analysis using BAC-probes located in the region indicated the presence of 6 signals on the r(18 chromosome. In addition, microsatellite analysis demonstrated that the unique supernumerary ring chromosome was paternally derived and both normal copies showed biparental disomy. Conclusions We report on an adult patient with multiple congenital abnormalities who had in 13% of his cells a unique supernumerary ring chromosome 18 that was composed of 6 copies of the 5 Mb gene rich region of 18q11.

  6. Maternal heterodisomy/isodisomy and paternal supernumerary ring of chromosome 7 in a child with Silver-Russell syndrome.

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    Combi, Romina; Sala, Elena; Villa, Nicoletta; Crosti, Francesca; Beccaria, Luciano; Cogliardi, Anna; Tenchini, Maria L; Dalprà, Leda

    2008-01-01

    Silver-Russell syndrome (SRS) is clinically variable although most cases have several common signs. Different chromosomes and chromosomal regions have been associated with SRS. Maternal uniparental disomy (UPD) of chromosome 7 is responsible for 5-10% of cases, probably because of an imbalance between maternal and paternal imprinted genes and more recently maternal duplication or epimutations in the 11p15 imprinted region have been described. To date, only two patients with maternal UPD7 and a mosaic condition for a supernumerary ring 7 marker have been reported, and we here report a further case. Standard QFQ banding of lymphocytes as well as fluorescence in-situ hybridization analyses were performed to identify and characterize the supernumerary marker. UPD testing was performed on both the patient's and parents' DNA using chromosome 7 microsatellite markers. The patient demonstrated a ring in about 4% of the analysed cells. On the basis of cytogenetic and molecular results, break points were tentatively identified as 7p11.2 and 7q21. Maternal hetero-/iso-UPD and a paternal origin for the supernumerary ring were demonstrated. Clinical data comparison between our patient who has a SRS phenotype and cases with hetero-/iso-UPD7 mat and mosaicism for a paternally derived chromosome 7 ring and previously reported ring 7 cases suggest that the SRS phenotype is probably because of the UPD rather than to the partial trisomy.

  7. Detection of paternal uniparental disomy 9 in a neonate with prenatally detected mosaicism for a small supernumerary marker chromosome 9 and a supernumerary ring chromosome 9.

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    Chen, Chih-Ping; Chen, Ming; Wang, Liang-Kai; Chern, Schu-Rern; Wu, Peih-Shan; Chen, Shin-Wen; Lai, Shih-Ting; Chang, Shun-Ping; Yang, Chien-Wen; Pan, Chen-Wen; Wang, Wayseen

    2017-08-01

    We present the association of paternal uniparental disomy (UPD) 9 with mosaicism for a small supernumerary marker chromosome 9 [sSMC(9)] and a supernumerary ring chromosome 9 [r(9)]. A 38-year-old woman underwent amniocentesis at 17 weeks of gestation because of advanced maternal age. Amniocentesis revealed a karyotype of 47,XY,+mar [25]/48,XY,+mar,+r(9) [4]/47,XY,+r(9) [1]/46,XY [6]. The parental karyotypes were normal. Array comparative genomic hybridization (aCGH) of cultured amniocytes revealed a result of de novo 9p13.1q21.11 (38,792,472-71,026,063) × 2.64. The marker chromosome was determined to be an sSMC(9) by spectral karyotyping and aCGH. A phenotypically normal baby was delivered at 38 weeks of gestation. During pediatric follow-ups at age two years, the neonate manifested normal psychomotor and growth development. Cytogenetic analysis, metaphase fluorescence in situ hybridization (FISH), single nucleotide polymorphism (SNP) aCGH and polymorphic DNA marker analysis were performed on the peripheral blood of the neonate. The neonate's blood had the following results. Metaphase FISH confirmed coexistence of the sSMC(9) and the supernumerary r(9). The karyotype was 47,XY,+sSMC(9) [14]/48,XY, +sSMC(9),+r(9) [10]/47,XY,+r(9) [6]/46,XY [10]. SNP aCGH revealed arr 9p22.3q21.11 (14,234,165-71,035,608) × 2-3, arr 9p24.3p22.3 (216,123-14,629,321)hmz, arr 9p21.3p13.2 (24,769,722-36,732,597)hmz and arr 9q21.11q34.3 (71,013,799-141,011,581)hmz. Polymorphic DNA marker analysis showed paternal isodisomy 9. Individuals with mosaicism for sSMC(9) and supernumerary r(9) may be associated with paternal UPD 9. Copyright © 2017. Published by Elsevier B.V.

  8. Gain of FAM123B and ARHGEF9 in an Obese Man with Intellectual Disability, Congenital Heart Defects and Multiple Supernumerary Ring Chromosomes.

    NARCIS (Netherlands)

    Hochstenbach, R.; Gijn, M.E. van; Krijtenburg, P.J.; Raemakers, R.; Slot, R. van 't; Renkens, I.; Eleveld, M.J.; Smagt, J.J. van der; Poot, M.

    2013-01-01

    In a 24-year-old man with mild intellectual disability, congenital heart defects and obesity, we identified up to 4 small supernumerary marker chromosomes (sSMCs) in blood metaphases. The ring-shaped sSMCs were derived from chromosomes 11, 12 and X as well as a fourth, unidentified chromosome. In

  9. Gain of FAM123B and ARHGEF9 in an Obese Man with Intellectual Disability, Congenital Heart Defects and Multiple Supernumerary Ring Chromosomes

    OpenAIRE

    Hochstenbach, R.; van Gijn, M.E.; Krijtenburg, P.-J.; Raemakers, R.; van t Slot, R.; Renkens, I.; Eleveld, M J; van der Smagt, J.J; Poot, M.

    2012-01-01

    In a 24-year-old man with mild intellectual disability, congenital heart defects and obesity, we identified up to 4 small supernumerary marker chromosomes (sSMCs) in blood metaphases. The ring-shaped sSMCs were derived from chromosomes 11, 12 and X as well as a fourth, unidentified chromosome. In interphase nuclei of epithelial cells from the urinary tract and buccal mucosa, the presence of the r(11), r(12) and r(X) was confirmed by FISH. Using Illumina Infinium 317K SNP-arrays, we detected 3...

  10. Gain of FAM123B and ARHGEF9 in an Obese Man with Intellectual Disability, Congenital Heart Defects and Multiple Supernumerary Ring Chromosomes.

    Science.gov (United States)

    Hochstenbach, R; van Gijn, M E; Krijtenburg, P-J; Raemakers, R; van 't Slot, R; Renkens, I; Eleveld, M J; van der Smagt, J J; Poot, M

    2013-01-01

    In a 24-year-old man with mild intellectual disability, congenital heart defects and obesity, we identified up to 4 small supernumerary marker chromosomes (sSMCs) in blood metaphases. The ring-shaped sSMCs were derived from chromosomes 11, 12 and X as well as a fourth, unidentified chromosome. In interphase nuclei of epithelial cells from the urinary tract and buccal mucosa, the presence of the r(11), r(12) and r(X) was confirmed by FISH. Using Illumina Infinium 317K SNP-arrays, we detected 3 copies of the pericentromeric regions of chromosomes 11, 12 and X. The r(X) was present in 84-89% of cells in the various tissues examined, lacks the XIST gene, but contains FAM123B, a potential dosage-sensitive candidate gene for congenital cardiac abnormalities, and ARHGEF9, a candidate gene for intellectual disability. ARHGEF9 encodes collybistin (CB), which is required for localization of the inhibitory receptor-anchoring protein gephyrin and for formation and maintenance of postsynaptic GABAA and glycine receptors. We propose that the 2-fold increase in dosage of ARHGEF9 disturbs the stoichiometry of CB with its interacting proteins at inhibitory postsynapses. SNP alleles and short tandem repeat markers on the r(11) and r(X) were compatible with a maternal origin of both sSMCs through a meiosis II error. The sSMCs may have resulted from predivision chromatid nondisjunction, leading to anaphase lagging, followed by incomplete degradation of the supernumerary chromosomes.

  11. Management of supernumerary teeth

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    Parolia, Abhishek; Kundabala, M; Dahal, Marisha; Mohan, Mandakini; Thomas, Manuel S

    2011-01-01

    Supernumerary paramolars are the rare anomalies of the maxillofacial complex. These are more common in the maxilla than in the mandible. This article reviews the etiology, frequency, classification, complications, diagnosis and management of supernumerary teeth (bilateral maxillary paramolars) PMID:22025821

  12. Bilateral tuberculate supernumerary teeth.

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    Eigbobo, Joycelyn Odegua; Osagbemiro, Babatope Bamidele

    2011-05-16

    Supernumerary teeth are teeth in excess of the normal series occurring in any region of the dental arch. They are located mostly in the anterior maxillary region and are classified according to their location and morphology. The tuberculate type of supernumerary tooth possesses more than one cusp or tubercle (barrel shaped). It is rare to find bilateral tuberculate supernumerary teeth in the premaxillary region and when found they rarely erupt. This report describes a 13-year-old boy with erupted palatally placed bilateral tuberculate supernumerary teeth. The presence of these supernumerary teeth led to the labial displacement and rotations of the anterior maxillary teeth. The treatment involved extraction of the supernumerary teeth and a referral for orthodontic management of the crowding, displacement and rotations. The occurrence of erupted palatally placed tuberculate anterior teeth in this case is a rare experience. However, the associated orthodontic problems are within familiar spectrum.

  13. Intracranial supernumerary tooth

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    Sjoeberg, S.; Loerinc, P.

    1984-12-01

    Case report of an accidentally diagnosed supernumerary tooth in the superior orbital fissure. Computed tomography (CT) contributed with a more precise localization of the tooth being situated between the orbit and the brain. CT also showed that there was no cyst or other pathological process around the supernumerary tooth, which is plausible and frequently reported in the literature.

  14. Supernumerary teeth in clinical practice

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    Anna K. Szkaradkiewicz; Tomasz M. Karpiński

    2011-01-01

    Introduction: Hyperdontia is the condition of having supernumerary teeth, or teeth which appear in addition to the regular number of teeth. The prevalence rates of supernumerary teeth in the permanent dentition amounts 0.1-6.9%, and in deciduous dentition 0.4-0.8%. The presence of supernumerary teeth can be found in everyday dental practice. Case presentation: We describe 3 cases of patients with supernumerary teeth. First patient had supernumerary lateral incisor 12s, second - premolar fu...

  15. Supernumerary teeth in clinical practice

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    Anna K. Szkaradkiewicz

    2011-07-01

    Full Text Available Introduction: Hyperdontia is the condition of having supernumerary teeth, or teeth which appear in addition to the regular number of teeth. The prevalence rates of supernumerary teeth in the permanent dentition amounts 0.1-6.9%, and in deciduous dentition 0.4-0.8%. The presence of supernumerary teeth can be found in everyday dental practice.Case presentation: We describe 3 cases of patients with supernumerary teeth. First patient had supernumerary lateral incisor 12s, second - premolar fused, multicuspid, supernumerary deciduous tooth 64s of having several interconnected roots, and third - erupted odontoma between teeth 13 and 14. In all cases treatment involved the removal of the supernumerary tooth.Conclusions: The decision on proceeding with the supernumerary teeth should be based on the full clinical picture and interview. Early diagnosis and removal of supernumerary teeth allow to avoid or reduce possible complications.

  16. Syndromes with supernumerary teeth.

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    Lubinsky, Mark; Kantaputra, Piranit Nik

    2016-10-01

    While most supernumerary teeth are idiopathic, they can be associated with a number of Mendelian syndromes. However, this can also be a coincidental finding, since supernumerary teeth occur in 6% or more of the normal population. To better define this relationship, we analyzed the evidence for specific associations. We excluded conditions with a single affected patient reported, supernumerary teeth adjacent to clefts or other forms of alveolar disruption (as secondary rather than primary findings), and natal teeth, which can involve premature eruption of a normal tooth. Since, the cause of supernumerary teeth shows considerable heterogeneity, certain findings are less likely to be coincidental, such as five or more supernumerary teeth in a single patient, or locations outside of the premaxilla. We found only eight genetic syndromes with strong evidence for an association: cleidocranial dysplasia; familial adenomatous polyposis; trichorhinophalangeal syndrome, type I; Rubinstein-Taybi syndrome; Nance-Horan syndrome; Opitz BBB/G syndrome; oculofaciocardiodental syndrome; and autosomal dominant Robinow syndrome. There is also suggestive evidence of an association with two uncommon disorders, Kreiborg-Pakistani syndrome (craniosynostosis and dental anomalies), and insulin-resistant diabetes mellitus with acanthosisnigricans. An association of a Mendelian disorder with a low frequency manifestation of supernumerary teeth is difficult to exclude without large numbers, but several commonly cited syndromes lacked evidence for clear association, including Hallermann-Streiff syndrome, Fabry disease, Ehlers-Danlos syndrome, Apert and Crouzon syndromes, Zimmermann-Laband syndrome, and Ellis-van Creveld syndrome. © 2016 Wiley Periodicals, Inc. © 2016 Wiley Periodicals, Inc.

  17. Bilateral supernumerary primary maxillary canines

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    Santanu Mukhopadhyay

    2018-01-01

    Full Text Available Supernumerary teeth are more common in the permanent than in primary dentition. In the primary dentition, the anomaly is most frequently observed in the maxillary lateral incisor region, followed by the maxillary midline where they are termed as mesiodens. Supernumerary teeth in the primary canine region are rare. This paper describes a rare case of nonsyndromic supernumerary primary maxillary canine distributed bilaterally in a 4-year-old boy. Both the supernumeraries resembled size and shape of normal primary canine. The right supplemental canine is high labially placed, whereas the left one is seen normally aligned in the dental arch distal to lateral incisor. One of the most significant sequelae of primary supernumerary teeth is their duplication in the permanent series. Radiographic examination of supernumerary primary canine did not indicate any such anomaly in the permanent dentition. The patient was kept under observation.

  18. [Multiple supernumerary teeth: a case report].

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    Chen, Jun; Zhang, Qing-Fu; Liu, Guo-Qin; Zhao, Hai-Jun; Zhang, Xin-Hai

    2010-02-01

    Supernumerary teeth is one of the dysplasia that the number of the teeth are more than physical number. Most cases of reports were with 1-2 supernumerary teeth and rare cases were with more than 3 supernumerary teeth. A 17-year old female patient of 7 impacted supernumerary teeth were found because of toothache of premolar caused by impacted supernumerary teeth and were treated by extraction of impacted supernumerary teeth.

  19. Supernumerary Teeth in Nepalese Children

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    Varun Pratap Singh

    2014-01-01

    Full Text Available Objective. The objectives of the present study were to investigate the prevalence and characteristics of supernumerary teeth in a patient sample of Nepalese children. Study Design. A survey was performed on 2684 patients (1829 females and 1035 males ranging in age from 6 to 14 for the presence of supernumerary teeth. For each patient with supernumerary teeth the demographic variables (age and sex, number, location, eruption status, and morphology were recorded. Descriptive statistics were performed. Results. Supernumerary teeth were detected in 46 subjects (1.6%, of which 26 were males and 20 were females with a male : female ratio of 1.3 : 1. The most commonly found supernumerary tooth was mesiodens followed by maxillary premolars, maxillary lateral incisor, and mandibular lateral incisor. Of the 55 supernumerary teeth examined, 58.18% (n=32 had conical morphology, followed by tuberculate (30.90%, n=17 and supplemental (10.90%, n=6 forms. The majority of the supernumerary teeth were erupted (56.36%, n=31. Conclusion. The prevalence of supernumerary teeth in Nepalese children was found to be 1.6%, the most frequent type being mesiodens. Conical morphology was found to be the most common form of supernumerary tooth.

  20. Supernumerary teeth in Nepalese children.

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    Singh, Varun Pratap; Sharma, Amita; Sharma, Sonam

    2014-01-01

    The objectives of the present study were to investigate the prevalence and characteristics of supernumerary teeth in a patient sample of Nepalese children. A survey was performed on 2684 patients (1829 females and 1035 males) ranging in age from 6 to 14 for the presence of supernumerary teeth. For each patient with supernumerary teeth the demographic variables (age and sex), number, location, eruption status, and morphology were recorded. Descriptive statistics were performed. Supernumerary teeth were detected in 46 subjects (1.6%), of which 26 were males and 20 were females with a male : female ratio of 1.3 : 1. The most commonly found supernumerary tooth was mesiodens followed by maxillary premolars, maxillary lateral incisor, and mandibular lateral incisor. Of the 55 supernumerary teeth examined, 58.18% (n = 32) had conical morphology, followed by tuberculate (30.90%, n = 17) and supplemental (10.90%, n = 6) forms. The majority of the supernumerary teeth were erupted (56.36%, n = 31). The prevalence of supernumerary teeth in Nepalese children was found to be 1.6%, the most frequent type being mesiodens. Conical morphology was found to be the most common form of supernumerary tooth.

  1. Nonsyndromic supernumerary bilateral parapremolars

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    Vineeta Singhal

    2017-01-01

    Full Text Available Supernumerary teeth are a rare finding in dental arch, which are mostly reported in association with syndromes. However, they can be seen in the absence of systemic disease. They may be single, multiple, unilateral, or bilateral with a predilection for the mandible, especially in nonsyndromic patients. Due to its different form and position in dental arch, it is observed to be associated with various periodontal problems. This case report presents a case of bilateral parapremolars in the maxillary arch in a nonsyndromic patient, which led to food lodgment and consequently led to caries and periodontal problem on the left maxillary arch.

  2. Supernumerary teeth in non-syndromic patients

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    Mali, Santosh; Karjodkar, Freny Rashmiraj; Sontakke, Subodh; Sansare, Kaustubh

    2012-01-01

    Hyperdontia or supernumerary teeth without associated syndrome is a rare phenomenon, as supernumerary teeth are usually associated with cleft lip and palate or other syndromes such as Gardner's syndrome, cleidocranial dysplasia, and so on. Five patients with supernumerary teeth visited our department. They had no familial history or other pathology, certain treatment protocols was modified due to the presence of supernumerary teeth. Non-syndromic supernumerary teeth, if asymptomatic, need to ...

  3. Differential expressions of bilaterally unerupted supernumerary teeth.

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    Masih, S; Sethi, H S; Singh, N; Thomas, A M

    2011-01-01

    This article presents a case of bilateral unerupted supernumerary teeth in the mandibular premolar region. Surgical removal of the right-sided supernumerary tooth had to be carried out as it was impeding the eruption of the mandibular first premolar. However, its supernumerary antimere, lay dormant.

  4. Supernumerary teeth "mesiodens". Case report.

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    Itro, A; Difalco, P

    2003-09-01

    The supernumerary tooth is an anomaly of dental eruption that is not rare to find in the clinical practice. Among the supernumerary teeth the "mesiodens" is most frequent. The mesiodens is found in the region of the superior central incisors and it can be the cause of many complications. The aim of this work is the description of a rare symptomatic case of mesiodens and the diagnostic and therapeutic strategies to adopt when this dental anomaly occurs. In particular the authors suggest making radiographic examinations only in the family of patients with dental anomalies of number, thinking that the incidence of such anomalies is too low to justify mass radiographic examinations.

  5. Supernumerary phantom limb after stroke

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    Bakheit, A; Roundhill, S

    2005-01-01

    The perception of a phantom limb is commonly reported after amputations. However, only a few cases have been described after a stroke. This article presents a patient who reported a supernumerary phantom limb (pseudopolymelia) after spontaneous intracerebral haemorrhage and discusses the possible underlying mechanisms for this rare phenomenon. PMID:15749787

  6. Aetiology of supernumerary teeth: a literature review.

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    Anthonappa, R P; King, N M; Rabie, A B M

    2013-10-01

    Supernumerary teeth are teeth, or tooth-like structures that have either erupted or remain unerupted in addition to the 20 primary and 32 permanent teeth. This paper attempts to (a) provide an overview of the proposed hypotheses and the current understanding of the aetiology of supernumerary teeth, and (b) review the published cases of supernumerary teeth occurring in families. No studies have been able to distinguish between different aetiologies for the different locations of supernumerary teeth, while, from a developmental or molecular perspective, the proposed hypotheses may be plausible and explains the origin of different types of supernumerary teeth. The only clearly evident feature, based on the existing published reports, is that it is logical to state that supernumerary teeth have a genetic component in their aetiology.

  7. Supernumerary teeth in non-syndromic patients.

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    Mali, Santosh; Karjodkar, Freny Rashmiraj; Sontakke, Subodh; Sansare, Kaustubh

    2012-03-01

    Hyperdontia or supernumerary teeth without associated syndrome is a rare phenomenon, as supernumerary teeth are usually associated with cleft lip and palate or other syndromes such as Gardner's syndrome, cleidocranial dysplasia, and so on. Five patients with supernumerary teeth visited our department. They had no familial history or other pathology, certain treatment protocols was modified due to the presence of supernumerary teeth. Non-syndromic supernumerary teeth, if asymptomatic, need to have periodical radiographic observation. If they showed no variation as they impacted in the jaw, careful examination is necessary because they may develop into pathological status such as dentigerous cysts. The importance of a precise clinical history and radiographic examination for patients with multiple supernumerary teeth should be emphasized.

  8. Supernumerary teeth in non-syndromic patients

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    Mali, Santosh; Karjodkar, Freny Rashmiraj; Sontakke, Subodh; Sansare, Kaustubh [Nair Hospital Dental College, Maharashtra (India)

    2012-03-15

    Hyperdontia or supernumerary teeth without associated syndrome is a rare phenomenon, as supernumerary teeth are usually associated with cleft lip and palate or other syndromes such as Gardner's syndrome, cleidocranial dysplasia, and so on. Five patients with supernumerary teeth visited our department. They had no familial history or other pathology, certain treatment protocols was modified due to the presence of supernumerary teeth. Non-syndromic supernumerary teeth, if asymptomatic, need to have periodical radiographic observation. If they showed no variation as they impacted in the jaw, careful examination is necessary because they may develop into pathological status such as dentigerous cysts. The importance of a precise clinical history and radiographic examination for patients with multiple supernumerary teeth should be emphasized.

  9. A coding solution for supernumerary teeth.

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    van der Westhuijzen, A J; Morkel, J A

    2011-08-01

    In South Africa payments for treatment rendered are routinely delayed because of the medical fund industry's apparent inability to capture codes denoting supernumerary teeth. The suggested protocol allows for up to 13 supernumerary teeth to be identified by two digits. Meetings planned between SADA and key funding stakeholders to "ensure that protocols related to tooth numbering are acceptable", provide the ideal opportunity to introduce the suggested two-digit protocol for numbering supernumerary teeth. If this proposal is implemented, it could alleviate the frustration associated with the rejection of accounts where supernumerary teeth are appropriately identified.

  10. Multiple supernumerary teeth in the mixed dentition.

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    Nadkarni, U M; Muthu, M S; Damle, S G; Sujan, S G; Kakade, A

    1999-03-01

    Supernumerary or extra teeth result from disturbances during the initiation and proliferation stages of dental development. Teeth formed in excess of the normal number are termed supernumerary teeth. A supernumerary tooth may closely resemble the teeth of the group to which it belongs i.e. molars, premolars or anterior teeth or it may bear little resemblance in size or shape to the teeth with which it is associated. Discussed here are reports of three cases with multiple supernumerary teeth in the mixed dentition and its management.

  11. Supernumerary maxillary and Mandibular Fourth Molars.

    Science.gov (United States)

    1981-09-23

    Company. 12. Luten, J.R.: The prevalence of supernumerary teeth in primary and mixed dentitions . J Dent Child 9:346-353, 1967. LEGEND Fig 1 Impacted...aide it n~coaesny and Identify by block number) Supernumerary teeth sk 1 AT waAC? V0111i (Cae s evem h N 011,690411 - idetit7 by block ntmmba) Five cases...of patients having supernumerary teeth in the distomolar regions of the mandibula and maxillary arches are reported. Supernumerary bicuspids were

  12. Crouzon syndrome with multiple supernumerary teeth | Torun ...

    African Journals Online (AJOL)

    Although hypodontia is usually present in cases with CS, supernumerary teeth are rarely seen. A 16‑year‑old male patient with CS was referred to our clinic. He had a high forehead, beaked nose, hypertelorism, palpebral ptosis, and asymmetrical orbits. Bilateral multiple supernumerary teeth were observed in his upper and ...

  13. Supernumerary teeth in a Turkish population.

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    Esenlik, Elçin; Sayin, M Ozgür; Atilla, A Onur; Ozen, Tuncer; Altun, Ceyhan; Başak, Feridun

    2009-12-01

    Our aim in this study was to investigate the frequency, distribution, sex differences, and characteristics of supernumerary teeth in a referred Turkish population. A total of 2599 patients' panoramic radiographs (1360 girls, 1239 boys) were evaluated, including children in both the mixed and the permanent dentitions. Their mean age was 8.6 +/- 0.23 years. Number, location, classification, side, and impaction of supernumerary teeth were evaluated. Furthermore, the development of these teeth was evaluated. Eighty-four supernumerary teeth were found on 69 radiographs; 9 were deciduous and 75 were permanent teeth. Most supernumerary teeth were in the premaxillary region (67%). Mesiodens (n = 43) was the most frequent supernumerary tooth (51.2%). This was followed by the maxillary lateral incisor (15.5%), the mandibular premolar (14.3%), the maxillary canine (9.5%), the maxillary premolar (6%), the mandibular lateral incisor (2.4%), and the mandibular canine (1.2%). Sixty-two (73.8%) supernumerary teeth were impacted. The male-female ratio was 1.13:1, which was not statistically significant. The prevalence of supernumerary teeth in Turkish children was 2.7% in this study.

  14. Taurodontism in association with supernumerary teeth.

    Science.gov (United States)

    Genc, A; Namdar, F; Goker, K; Atasu, M

    1999-01-01

    The dental, radiological, genetic and dermatoglyphic findings of an additional patient with taurodontism in association with supernumerary teeth were presented and the findings of the patient were compared with those in the literature.

  15. Fibroadenoma in axillary supernumerary breast: case report

    Directory of Open Access Journals (Sweden)

    Délio Marques Conde

    Full Text Available CONTEXT: Supernumerary breast tissue may be affected by the same diseases and alterations that compromise topical breast tissue. Nevertheless, reports of fibroadenoma in supernumerary breast tissue in the axillae are rare. OBJECTIVE: To describe a case of fibroadenoma in an axillary supernumerary breast. DESIGN: Case report. CASE REPORT: A 39-year-old woman was referred to the gynecology and obstetrics outpatient clinic at Hospital Estadual Sumaré, complaining of bilateral axillary masses. The patient reported cosmetic problems and local pain and discomfort. On physical examination, alterations compatible with bilateral axillary accessory breasts, without palpable nodules, were observed. Supplementary examinations (mammography and ultrasonography revealed a 1.1 cm mass in the right axillary breast. The patient underwent resection of the supernumerary breasts and histopathological examination revealed fibroadenoma of the right axillary breast tissue.

  16. Retrospective study of 145 supernumerary teeth

    OpenAIRE

    Fernández Montenegro, Paula; Valmaseda Castellón, E.; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2006-01-01

    Objective: The goal of the present retrospective study is to describe the distribution of the supernumerary teeth in a population of patients that have been attended at the Public Clinic of the Department of Oral Surgery. Background: Supernumerary teeth and multiple hyperdontia are usually associated with different syndromes, such as Gardner syndrome, or with facial fissures; however, they can appear in patients without any pathology. Their prevalence oscillates to 0.5-3.8% in patients wi...

  17. Supernumerary molars. A review of 53 cases

    OpenAIRE

    Menardía Pejoan, V.; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2000-01-01

    Supernumerary molars are not uncommon and may be found nearly anywhere in the dental alveolar arches. A series of 36 patients that presented with 53 supernumerary molars are reviewed. They occurred more frequently in the maxilla (86.8%), had little or no clinical significance, tended to be impacted, and were not associated with the impactation of the third molar. Four cases of maxillary fifth molars are described

  18. Retrospective study of 145 supernumerary teeth

    OpenAIRE

    Fernández Montenegro, Paula; Valmaseda Castellón, Eduardo; Berini Aytés, Leonardo; Gay Escoda, Cosme

    2006-01-01

    Objective: The goal of the present retrospective study is to describe the distribution of the supernumerary teeth in a population of patients that have been attended at the Public Clinic of the Department of Oral Surgery. Background: Supernumerary teeth and multiple hyperdontia are usually associated with different syndromes, such as Gardner syndrome, or with facial fissures; however, they can appear in patients without any pathology. Their prevalence oscillates to 0.5-3.8% in patients with p...

  19. Molecular genetics of supernumerary tooth formation.

    Science.gov (United States)

    Wang, Xiu-Ping; Fan, Jiabing

    2011-04-01

    Despite advances in the knowledge of tooth morphogenesis and differentiation, relatively little is known about the aetiology and molecular mechanisms underlying supernumerary tooth formation. A small number of supernumerary teeth may be a common developmental dental anomaly, while multiple supernumerary teeth usually have a genetic component and they are sometimes thought to represent a partial third dentition in humans. Mice, which are commonly used for studying tooth development, only exhibit one dentition, with very few mouse models exhibiting supernumerary teeth similar to those in humans. Inactivation of Apc or forced activation of Wnt/β(catenin signalling results in multiple supernumerary tooth formation in both humans and in mice, but the key genes in these pathways are not very clear. Analysis of other model systems with continuous tooth replacement or secondary tooth formation, such as fish, snake, lizard, and ferret, is providing insights into the molecular and cellular mechanisms underlying succesional tooth development, and will assist in the studies on supernumerary tooth formation in humans. This information, together with the advances in stem cell biology and tissue engineering, will pave ways for the tooth regeneration and tooth bioengineering. Copyright © 2011 Wiley-Liss, Inc.

  20. The management of premolar supernumeraries in three orthodontic cases.

    LENUS (Irish Health Repository)

    McNamara, C M

    1997-01-01

    This paper reviews the incidence, etiology and location of supernumerary teeth with emphasis on premolar supernumeraries and examines the management of supernumerary premolars of three patients undergoing orthodontics. These cases demonstrate that the management of premolars is assessed individually and treatments based on potential complications, which may occur during the orthodontic and surgical management of the dentition. Progress and posttreatment radiographs are recommended for the assessment of late forming supernumerary teeth.

  1. Prevalence, etiology, diagnosis, treatment and complications of supernumerary teeth

    OpenAIRE

    Ata-Ali Mahmud, Fadi; Ata-Ali Mahmud, Francisco Javier; Peñarrocha Oltra, David; Peñarrocha Diago, Miguel

    2014-01-01

    The aim of this article was to review the literature on supernumerary teeth, analyzing their prevalence, etiology, diagnosis, treatment and possible complications. An electronic search was made in the Pubmed-Medline database up to January 2014 using the key search terms ?multiple supernumerary teeth? (n=279), ?prevalence supernumerary teeth? (n=361), and ?supernumerary teeth? (n=2412). In addition to the articles initially identified, others were included in the review proceeding from a manua...

  2. Rare molariform supernumerary teeth: Why are they bilateral?

    Directory of Open Access Journals (Sweden)

    Parul Jain

    2017-01-01

    Full Text Available Anterior supernumerary teeth in the permanent dentition may be supplemental or rudimentary. Rudimentary types are further classified as conical, tuberculate, and molariform. The molariform type has been only rarely reported. We report a rare variety of anterior supernumerary teeth - the molariform type, occurring bilaterally and in association with a midline supernumerary tooth. We also suggest a hypothesis for the bilateral occurrence of supernumerary teeth.

  3. [Supernumerary teeth located in molar region: three cases report].

    Science.gov (United States)

    Dai, Jie; Yang, Weijiang; Shen, Xuanjiang

    2011-08-01

    Supernumerary teeth is one of the teeth dysplasia that the number of teeth exceeded normal. Most of supernumerary teeth reported were located in anterior teeth region, but rare cases were reported in molar region. This paper reported three cases that supernumerary teeth located in molar region.

  4. Characteristics of supernumerary teeth among nonsyndromic dental patients

    Directory of Open Access Journals (Sweden)

    Szu-Ting Chou

    2015-06-01

    Conclusion: The prevalence of supernumerary teeth in this study was 2.6%, the most frequent location being at the anterior maxilla. Numerous factors should be considered when evaluating supernumerary teeth. Specifically, the demographic profiles of patients with supernumerary teeth provide useful epidemiological information.

  5. Supernumerary teeth: Report of four unusual cases

    Directory of Open Access Journals (Sweden)

    Arun Kumar

    2012-01-01

    Full Text Available Supernumerary tooth denotes duplication of tooth in the normal series. It is a developmental anomaly and has been argued to arise from multiple etiologies. These teeth may remain embedded in the alveolar bone or can erupt into the oral cavity. The supernumerary tooth might cause esthetic and/or functional problems, especially if it is situated in the maxillary anterior region. Complications reported were delayed or prevented eruption of succedaneous teeth, displacement or rotation, crowding of the affected region, abnormal diastema, dilacerations, cystic formation, and sometime eruption into the nasal cavity. In this case report, four unusual cases of supernumerary teeth that resulted in varying degrees of disturbances in permanent dentition are presented. Conservative surgical intervention and light orthodontic forces were used to bring the teeth into normal position with minimal disturbance to the surrounding oral structures.

  6. Supernumerary teeth: Report of four unusual cases.

    Science.gov (United States)

    Kumar, Arun; Namdev, Ritu; Bakshi, Lokesh; Dutta, Samir

    2012-04-01

    Supernumerary tooth denotes duplication of tooth in the normal series. It is a developmental anomaly and has been argued to arise from multiple etiologies. These teeth may remain embedded in the alveolar bone or can erupt into the oral cavity. The supernumerary tooth might cause esthetic and/or functional problems, especially if it is situated in the maxillary anterior region. Complications reported were delayed or prevented eruption of succedaneous teeth, displacement or rotation, crowding of the affected region, abnormal diastema, dilacerations, cystic formation, and sometime eruption into the nasal cavity. In this case report, four unusual cases of supernumerary teeth that resulted in varying degrees of disturbances in permanent dentition are presented. Conservative surgical intervention and light orthodontic forces were used to bring the teeth into normal position with minimal disturbance to the surrounding oral structures.

  7. Laparoscopic management of tumor in supernumerary ovary

    Science.gov (United States)

    Prakash, Ved; Kant, Anita; Parashar, Abha; Rani, Uma

    2016-01-01

    Laparoscopic management of most of the adnexal masses has become feasible in the present era of advancing endoscopic techniques. A postmenopausal lady presented with lump in the abdomen, appeared to be a solid ovarian mass on ultrasound, and magnetic resonance imaging. On laparoscopy, both the ovaries were normal and the mass was not connected to uterus or adnexa. The mass was removed and histopathology confirmed it to be ovarian tissue thus confirming it to be a tumor in a supernumerary ovary. Examples of supernumerary ovary are among the rarest of gynecological abnormalities. PMID:27134478

  8. Laparoscopic management of tumor in supernumerary ovary

    Directory of Open Access Journals (Sweden)

    Ved Prakash

    2016-01-01

    Full Text Available Laparoscopic management of most of the adnexal masses has become feasible in the present era of advancing endoscopic techniques. A postmenopausal lady presented with lump in the abdomen, appeared to be a solid ovarian mass on ultrasound, and magnetic resonance imaging. On laparoscopy, both the ovaries were normal and the mass was not connected to uterus or adnexa. The mass was removed and histopathology confirmed it to be ovarian tissue thus confirming it to be a tumor in a supernumerary ovary. Examples of supernumerary ovary are among the rarest of gynecological abnormalities.

  9. Supernumerary Teeth in Indian Children: A Survey of 300 Cases

    Directory of Open Access Journals (Sweden)

    Amita Sharma

    2012-01-01

    Full Text Available The aim of this investigation was to study children with supernumerary teeth who visited the Department of Pedodontics and Preventive Dentistry, Government Dental College and Hospital, Rohtak, Haryana, India. Only children with supernumerary teeth were included in the study while patients having supernumerary teeth with associated syndromes were excluded. Supernumeraries were detected by clinical and radiographic examination. The results indicated that males were affected more than females with a sex ratio of 2.9 : 1. Single supernumerary tooth was seen in 79% of the patients, 20% had double, and 1% had three or more supernumeraries. Premaxillary supernumeraries accounted for 93.8% of the cases. Conical shaped supernumerary teeth were the most common type (59.7%. Majority of supernumeraries remained unerupted (65%. Fusion of supernumerary tooth with a regular tooth was observed in 4% of the patients. Talon cusp, an associated dental anomaly, was seen in 5% of the cases. Simultaneous hypodontia occurred in 2.3% of patients with supernumeraries.

  10. The epidemiology of supernumerary teeth and the associated molecular mechanism.

    Science.gov (United States)

    Lu, Xi; Yu, Fang; Liu, Junjun; Cai, Wenping; Zhao, Yumei; Zhao, Shouliang; Liu, Shangfeng

    2017-07-03

    Supernumerary teeth are common clinical dental anomalies. Although various studies have provided abundant information regarding genes and signaling pathways involved in tooth morphogenesis, which include Wnt, FGF, BMP, and Shh, the molecular mechanism of tooth formation, especially for supernumerary teeth, is still unclear. In the population, some cases of supernumerary teeth are sporadic, while others are syndrome-related with familial hereditary. The prompt and accurate diagnosis of syndrome related supernumerary teeth is quite important for some distinctive disorders. Mice are the most commonly used model system for investigating supernumerary teeth. The upregulation of Wnt and Shh signaling in the dental epithelium results in the formation of multiple supernumerary teeth in mice. Understanding the molecular mechanism of supernumerary teeth is also a component of understanding tooth formation in general and provides clinical guidance for early diagnosis and treatment in the future.

  11. Non-syndromic supernumerary teeth: report of a case with 6 supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Taghibakhsh M

    2011-02-01

    Full Text Available "nBackground and Aims: Multiple supernumerary teeth are rare and often found in association with syndromes such as Gardner, Cleidocranial dysplasia and cleft lip and palate, with a much less chance for isolated"nnon-syndromic cases. The aim of this study was to report a case with 6 supernumerary teeth without syndromic association."nCase Report: The patient was a 33 year-old female, referred to oral diseases and diagnosis department with chief complaint of sensitivity to cold and hot food in right upper premolar region. Oral examination revealed 5 erupted lingually supernumerary teeth (four in mandibular and one in maxillary premolar region, respectively. Further panoramic radiography clarified an extra impacted tooth in the palatal region of left premolar maxillary area. All extra teeth had been appeared since the age of 17 during one year, as the patient claimed. Medical history and thorough clinical and paraclinical examinations were not significant except for the hypothyroidism, since 5 years ago. No other family member noticed to be the case. Based on our findings, a diagnosis of non-syndromic multiple supernumerary teeth was established."nConclusion: A thorough examination of each patient presented with supernumerary teeth, including panoramic and intraoral radiographic images may provide valuable information regarding accompanying syndromes and unerupted teeth. Early diagnosis is an essential step for orthodontic or surgical decisions making, preventing or avoiding worsening complications such as malocclusion, adjacent normal teeth delayed eruption or rotation, diasthema, cystic lesions and resorption of contiguous teeth.

  12. Bilateral Supernumerary Teeth in Deciduous Dentition-A Rarity

    OpenAIRE

    Acharya, Sonu; Ghosh, Chiranjit; Mondal, Pradeep Kumar

    2014-01-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition and more often seen in males. A supernumerary tooth in the primary dentition can cause ectopic or delayed eruption of permanent centr...

  13. Multiple maxillary and mandibular supernumerary teeth in twins: 5-year follow-up

    OpenAIRE

    Liu, Jeng-Fen; Chen, Hui-Ling

    2014-01-01

    This is a case report of multiple supernumerary teeth of identical twins with 5 years of follow-up. The occurrence of supernumerary teeth in twins is an unusual event. This case report describes 7-year-old Taiwanese twin brothers who both presented with multiple supernumerary teeth in the premaxillary and mandibular premolar regions. The supernumerary premolars developed much later than the premaxillary supernumerary teeth in these twins. The supernumerary premolars caused impaction of the ma...

  14. Canaliculitis in supernumerary puncta and canaliculi

    Directory of Open Access Journals (Sweden)

    Ku Chui Yong

    2011-08-01

    Full Text Available We report the first case of supernumerary puncta and canaliculi presented with canaliculitis. A-59 year-old gentleman presented with painful swelling of the left lower lid for a week, which was associated with epiphora. The swelling was confined to the nasal aspect of the left lower lid (0.5¥0.5 mm with inflamed overlying skin. Two puncta (0.5 mm apart were noted. The outer punctum at the normal anatomical position was a cul-de-sac while the inner punctum it the caruncle was patent. We described the embryology leading to supernumerary puncta and canaliculi to explain the paradoxical patency of the abnormally located punctum as well as the pathomechanism leading to canaliculitis. The patient was treated with oral cloxacillin 500 mg, 6 hourly for 5 days; the cellulitis subsided after three days.

  15. Supernumerary teeth vary depending on gender

    Directory of Open Access Journals (Sweden)

    Erika Calvano Küchler

    2011-02-01

    Full Text Available The presence of supernumerary teeth (ST is a dental developmental anomaly of patterning and morphogenesis. Its variability of morphology, location and developmental timing can shed light on its etiology. In this work we report ST patterns. Orthopantomograms of 1,166 pediatric subjects were examined and the morphology, location and timing of the formation of ST were determined. The frequency of supernumerary teeth in the studied population was 2.3% (n = 27. Twenty-five subjects presented one ST. Maxilla midline was the most commonly affected region (nine cases. We noted high incidence of conical morphology in the midline region. Only teeth with tuberculate morphology presented delayed formation. ST in the midline region occurred more often in males whereas ST in the incisor region were more common in females. In conclusion, ST patterns vary depending on gender.

  16. The effects of impacted premaxillary supernumerary teeth on permanent incisors

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Yun Hoa; Kim, Ji Yeon; Cho, Bong Hae [School of Dentistry, Pusan National University, Yangsan (Korea, Republic of)

    2016-12-15

    The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape.

  17. The effects of impacted premaxillary supernumerary teeth on permanent incisors.

    Science.gov (United States)

    Jung, Yun-Hoa; Kim, Ji-Yeon; Cho, Bong-Hae

    2016-12-01

    The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape.

  18. Bilateral supernumerary teeth in deciduous dentition-a rarity.

    Science.gov (United States)

    Acharya, Sonu; Ghosh, Chiranjit; Mondal, Pradeep Kumar

    2014-05-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition and more often seen in males. A supernumerary tooth in the primary dentition can cause ectopic or delayed eruption of permanent central incisors which will further alter occlusion and may compromise esthetics and formation of dentigerous cysts. Here we discuss a case of bilateral supernumerary teeth in deciduous dentition in a female child.

  19. Prevalence, etiology, diagnosis, treatment and complications of supernumerary teeth.

    Science.gov (United States)

    Ata-Ali, Fadi; Ata-Ali, Javier; Peñarrocha-Oltra, David; Peñarrocha-Diago, Miguel

    2014-10-01

    The aim of this article was to review the literature on supernumerary teeth, analyzing their prevalence, etiology, diagnosis, treatment and possible complications. An electronic search was made in the Pubmed-Medline database up to January 2014 using the key search terms "multiple supernumerary teeth" (n=279), "prevalence supernumerary teeth" (n=361), and "supernumerary teeth" (n=2412). In addition to the articles initially identified, others were included in the review proceeding from a manual search and from any references considered of relevance. Supernumerary teeth are those that exceed the normal dental formula. They are more common in men, more common in the upper maxilla, and more prevalent in permanent dentition. Complications associated with supernumerary teeth include dental impaction, delayed eruption, ectopic eruption, overcrowding, spacing anomalies and the formation of follicular cysts. The treatment of supernumerary teeth depends on their type, position, and possible complications, detected clinically and radiographically. No clear consensus exists as to the best time to extract unerupted supernumerary teeth. Key words:Hyperdoncia, supernumerary teeth, impacted teeth, treatment, permanent teeth, deciduous teeth.

  20. Supernumerary teeth: Review of literature and decision support system

    Directory of Open Access Journals (Sweden)

    Deepti Amarlal

    2013-01-01

    Full Text Available Supernumerary teeth are those which are additional or in excess of the normal number. They can be either single or multiple, unilateral or bilateral and can be present anywhere in the dental arch with predilection for the premaxilla. Supernumerary teeth are mostly classified on position and form. Timing of surgical intervention of supernumerary teeth has been controversial with various authors having different opinions. Hence a new decision support system is put forward which can help in the treatment planning of supernumerary teeth.

  1. A VARIANT OF LAURENCE - MOON - BARDET - BIEDL SYNDROME SUPERNUMERARY TEETH

    OpenAIRE

    Arun Kumar; Ramesh; Yashaswini; Basavaraju; Mohan Kumar

    2014-01-01

    This family had a spectrum of many variants of Laurence moon bardet biedel syndrome in a single family , which had not been reported till date w here the affected family members had supernumerary teeth. Hence we propose a new syndrome complex in this family which is similar to Bardet biedl syndrome , but with added features of supernumerary teeth

  2. Characteristics, clinical features and treatment of supernumerary teeth.

    Science.gov (United States)

    Yassin, Othman M; Hamori, Eman

    2009-01-01

    To determine the characteristics, clinical features and treatment of supernumerary teeth in a general district hospital in the North of Jordan. This retrospective study was conducted at Prince Rashid Al-Hassan Hospital in Irbid. The medical records of 139 patients who were diagnosed to have supernumerary teeth during the period April 1993 - June 2007 were reviewed. Clinical data on the location, number eruption status, stages of development, and the types of supernumerary teeth were recorded, along with information on demographics, treatment, associated systemic syndromes, effects on adjacent teeth, and treatment. The male to female ratio was 2.2:1. Of the 186 supernumerary teeth investigated (65.0%) were conical, (23.7%) supplemental, (10.8%) tuberculate and (0.5%) odontoma. Two-thirds of the supernumeraries were erupted. Of this sample (21.6%) patients had multiple supernumerary teeth. The most frequent location was at the premaxilla level. The most common effect on adjacent teeth was delayed eruption (23.1%). Simple and surgical extractions of supernumerary teeth were done for (81.7%) of the cases and orthodontic treatment was needed in (74.1%) of patients. Supernumerary teeth are an uncommon dental entity. An early diagnosis prevents or reduces the risk of complications and when combined with an earlier removal has a better prognosis.

  3. supernumerary teeth, polimorfisme gen vitamin D reseptor (VDR)

    OpenAIRE

    ASMAWATI

    2014-01-01

    Latar Belakang: Anomali gigi supernumerary teeth adalah kelainan bentuk dan jumlah gigi yang dapat menyebabkan masalah maloklusi, menganggu estetik dan deviasi ordinat gigi. Pada kondisi yang tidak erupsi dapat menyebabkan ameloblastoma dan odontogenic neoplasma. Adanya dugaan kuat faktor herediter sebagai penyebab terjadinya sehingga memerlukan penelitian genetik molekuler untuk membuktikan faktor genetik sebagai faktor risiko terjadinya supernumerary teeth,sehingga meningkatkan optimalisa...

  4. Tuberculate Supernumerary Teeth: Report of A Case Showing ...

    African Journals Online (AJOL)

    Tuberculate supernumerary teeth are found in the maxillary anterior region. They usually result in oral problems such as malocclusion, food impaction, poor aesthetics and cyst formation. There is paucity of literature on this anomaly in our environment. This paper describes a case of tuberculate supernumerary teeth with ...

  5. Non-syndromic multiple supernumerary teeth among patients seen ...

    African Journals Online (AJOL)

    Background: The global prevalence of multiple supernumerary teeth for permanent and primary dentition in various populations is between 0.05- 5.3% and 0.2-0.8%. A previous study in Nigeria reported a very low prevalence of multiple supernumeraries. Aim: To ascertain any variation in the prevalence and presentation of ...

  6. Supernumerary primary teeth and the clinical significance: a report ...

    African Journals Online (AJOL)

    Supernumerary teeth occur frequently in the permanent dentition but they are rare in the primary dentition. Supernumerary teeth in the primary dentition usually erupt normally and are frequently of the supplemental type. The issue of differentiating the supplemental tooth from the normal series requires careful consideration.

  7. Asymptomatic Bilateral Ureteropelvic Junction Obstruction due to Supernumerary Renal Arteries

    Directory of Open Access Journals (Sweden)

    Shoja Mohammadali

    2008-01-01

    Full Text Available A supernumerary renal artery is a common arterial variation, which warrants consi-derations in a variety of urologic and retroperitoneal operations. Supernumerary renal arteries can be associated with other uro-vascular variations and anomalies such as duplicated renal veins and ureters, aberrant origin of the gonadal arteries, persistence of fetal renal lobulation, and kidney malrotation. The role of crossing supernumerary renal arteries in ureteropelvic junction obstruc-tion (UPJO is controversial. We report a healthy potential renal transplant donor with bilateral UPJO, which appeared to be secondary to supernumerary renal (inferior polar arteries. We believe that the bilateral occurrence of asymptomatic UPJO associated with supernumerary renal arteries has not been previously reported.

  8. Multilobed mesiodens: a supernumerary tooth with unusual morphology.

    Science.gov (United States)

    Dave, Bhavna; Patel, Jalark; Swadas, Milan; Mallikarjuna, Rachappa

    2013-02-06

    An 8-year-old boy came with a chief complaint of an abnormally shaped tooth situated in upper front teeth region. On examination a supernumerary tooth with multiple lobes was present palatally to the maxillary right permanent central incisor. The morphology of the tooth crown was found to be unusual due to the presence of five lobes in the crown portion. Because of the supernumerary tooth, the permanent right central incisor was displaced labially. Radiographic examination showed a completely formed supernumerary tooth with dilacerated root. On the basis of clinical and radiographic examination, the supernumerary tooth was diagnosed as multilobed mesiodens. Since patient expressed dissatisfaction with the presence of supernumerary tooth, it was decided to extract this mesiodens followed by orthodontic treatment for alignment of labially placed maxillary right permanent central incisor.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2010-06-15

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

  10. Bilaterally impacted mandibular supernumerary premolars associated with unusual clinical complications

    Directory of Open Access Journals (Sweden)

    Zameer Pasha

    2013-01-01

    Full Text Available Supernumerary teeth are extra teeth in comparison to the normal dentition. Their prevalence varies between 0.1% and 3.8%. Supernumeraries are more common in permanent dentition and its incidence is higher in maxillary incisor region, followed by maxillary third molar and mandibular molar, premolar, canine, and lateral incisor. The prevalence of supernumerary premolars is between 0.075-0.26%, and they may occur in single or multiple numbers Bilateral occurrence is uncommon and large percentage of supernumerary premolars remains impacted, unerupted, and usually asymptomatic; radiograph plays an important role in diagnosis of these. The present paper reports a case of bilaterally impacted completely developed supernumerary premolars associated with common clinical complication in unusual manner along with taurodontism of the upper and lower molars.

  11. A multi-centre evaluation of multiple supernumerary premolar prevalence.

    Science.gov (United States)

    Gunduz, Kaan; Avsever, Hakan; Orhan, Kaan; Canitezer, Gözde; Acikgoz, Aydan; Oz, Ulas; Midilli, Muhammet

    2015-11-01

    The occurrence of multiple supernumerary teeth is rare and often found in association with syndromes such as cleidocranial dysplasia, Gardner's syndrome or cleft lip and palate. Few examples of non-syndromal multiple supernumerary teeth have been reported. The aim of this multi-centre study was to investigate the prevalence of supernumerary premolar teeth in non-syndromic patients and to investigate the association between the presence of supernumerary premolar teeth and malocclusion type in a Turkish population. The clinical records and panoramic radiographs of 10,700 patients (referred to three different university hospitals) were retrospectively examined for the presence of supernumerary premolars. Age, gender, orthodontic malocclusion type, the number of supernumerary premolars (two or more), the distribution, location, position (vertical, horizontal, inverted, mesio-angular), surgical approach, and related complications (pain, cystic changes, root resorption, or eruption disturbance of adjacent teeth) were recorded. Forty-two cases (13 Class I, 17 Class II, 12 Class III) of multiple mandibular supernumerary premolars in patients without an associated syndrome were detected. A total of 97 (27 Class I, 41 Class II, 29 Class III) supernumerary premolar teeth were found, with a prevalence of 0.39%. No statistical difference was found related to gender, malocclusion type and supernumerary premolars (p > 0.05). The majority of the extra premolars were located in the mandible, which was statistically significant (p supernumerary teeth was 0.39%. The most frequently impacted premolars were found in the mandible and more often associated with Class II malocclusions in the examined Turkish population.

  12. Non-syndrome associated multiple supernumerary teeth: A report of two cases

    OpenAIRE

    Nayak Ullal; Mathian V; Veerakumar

    2006-01-01

    Multiple supernumerary teeth are usually associated with syndromes. On the contrary, multiple supernumerary teeth without association with any syndromes are very rare. This article presents a report of two cases with multiple supernumerary teeth not associated with any syndrome and emphasizes the routine advice of orthopantomogram whenever a single supernumerary tooth is detected irrespective of whether the patient has any syndrome or not.

  13. A sixteen year sample of surgically treated supernumerary teeth.

    Science.gov (United States)

    Pippi, R

    2011-03-01

    Supernumerary teeth represent a numerical dental anomaly in which more teeth than the norm are present in the dentition. A sixteen year sample of supernumerary teeth has been reviewed in order to analyse epidemiological data, morphological and topographic features of these teeth, especially of those located in the praemaxillary region. All cases in which supernumerary teeth were surgically treated from 1991 to 2006 at the Oral Surgery Unit of the Sapienza University of Rome have been reviewed. 118 Caucasian subjects with supernumerary teeth have been reviewed in the range of age comprised between 5 and 42 years: 191 SNTs were collected, 136 from the upper jaw and 55 from the mandible. In the maxilla the incisor region was more frequently involved (67.65%), while in the mandible the one most frequently involved was the premolar region (69.1%). Conoid was the most frequent type of supernumerary teeth. Uneruption of the contiguous permanent teeth was the most commonly associated pathological condition, found in 81 out of the 191 cases of supernumerary teeth (40 patients, 42.4%). Tuberculated, infundibuliform and incisiform-shaped teeth caused uneruption of permanent teeth more frequently than the other morphological types of supernumerary teeth. In the upper incisor area, the extraction of SNT is mandatory as early as they are diagnosed, especially if they are tuberculated, infundibuliform and incisiform-shaped, if they are located palatally or just in the middle of the ridge and when more than one SNT is present.

  14. Odontomas and supernumerary teeth: is there a common origin?

    Science.gov (United States)

    Pippi, Roberto

    2014-01-01

    The aim of the present work is to analyze all scientific evidence to verify whether similarities supporting a unified explanation for odontomas and supernumerary teeth exist. A literature search was first conducted for epidemiologic studies indexed by PubMed, to verify their worldwide incidence. The analysis of the literature data shows some interesting similarities between odontomas and supernumerary teeth concerning their topographic distribution and pathologic manifestations. There is also some indication of common genetic and immuno-histochemical factors. Although from a nosological point of view, odontomas and supernumeraries are classified as distinct entities, they seem to be the expression of the same pathologic process, either malformative or hamartomatous.

  15. Prevalence of supernumerary teeth in deciduous and mixed dentition.

    Science.gov (United States)

    Dash, J K; Sahoo, P K; Das, S; Mohanty, U K

    2003-03-01

    Supernumerary teeth are the extra teeth which may have either erupted or unerupted in addition to normal dentition and are seen both in deciduous as well as permanent dentition. The incidence of supernumerary teeth shows more frequent occurrence in permanent dentition than deciduous dentition, affecting both the sexes. The etiology of supernumerary teeth is still unknown and not well understood, but thought to be the result from disturbance during the initiation and proliferation stages of tooth development. In the present study an attempt has been made to asses, its prevalence in deciduous and mixed dentition phase.

  16. Bilateral supernumerary kidneys in conjunction with horseshoe anomaly

    Directory of Open Access Journals (Sweden)

    Mahmoud Mustafa

    2012-01-01

    Full Text Available Bilateral supernumerary kidney is a very rare urogenital anomaly, with four cases reported in the literature thus far. To the best of our knowledge, bilateral supernumerary kidney in conjunction with horseshoe fusion anomaly is not reported till date. Herein, we report a 63-year-old male patient with persistent lower abdominal pain. Complete radiological evaluation including ultrasound, computed tomography scan, excretory urography and retrograde pyelography were done and the diagnosis was established. The dilemma faced in the diagnosis and management of patients with supernumerary kidneys is discussed.

  17. Supernumerary registrar experience at the University of Cape Town ...

    African Journals Online (AJOL)

    Supernumerary Registrar Masters of Medicine Enrolment List 2012,. Postgraduate Medical Education Office, Faculty of Health Sciences,. University of Cape Town – unpublished). SNRs are not locally remunerated. Most SNRs originate from African countries ...

  18. Clinical management of supernumerary teeth: A report of two cases

    Directory of Open Access Journals (Sweden)

    Mittal M

    2010-09-01

    Full Text Available Supernumerary tooth may closely resemble the teeth of the group to which it belongs, i.e. molars, premolars or anterior teeth, or it may bear little resemblancein size or shape to which it is associated. Many complications can be associated with supernumeraries, like impaction, delayed eruption or ectopic eruption of adjacent teeth, crowding, development of median diastema and eruption into floor of the nasal cavity. This may also cause the formation of follicular cysts with significant bone destruction. Early intervention to remove it is usually required to obtain reasonable alignment and occlusal relationship. This article will present the clinical management of an (i impacted supernumerary tooth impeding the eruption of maxillary central incisor and (ii erupted supernumerary tooth with midline diastema.

  19. Non-syndromic multiple supernumerary teeth: a rare entity.

    Science.gov (United States)

    Agrawal, Jiwanasha Manish; Agrawal, Manish Suresh; Nanjannawar, Lalita Girish; Adaki, Raghavendra Vithalappa

    2013-01-10

    Hyperdontia or supernumerary teeth without associated syndromes is a rare phenomenon, as supernumerary teeth are usually associated with cleft lip and palate or other syndromes such as Gardeners syndrome, cleidocranial dysplasia, trichorhinophalangic syndrome, etc. A 15-year-old girl reported for orthodontic treatment with a chief complaint of irregular teeth and unaesthetic smile. On examination class I malocclusion with severe crowding of upper anteriors, anterior open bite of 5 mm, cross bite with upper right posteriors, upper midline shift to right by 5 mm and two supernumerary teeth placed buccally in between 16 & 17 and 26 & 27, respectively, were found. On routine radiographical examination, two additional impacted supernumerary teeth were noticed distal to 18 and in mandibular arch in between roots of 35 and 36. A general physician was consulted who confirmed that there was no associated syndrome. Family history did not reveal any positive findings.

  20. Clinical management of supernumerary teeth: a report of two cases.

    Science.gov (United States)

    Mittal, M; Sultan, A

    2010-01-01

    Supernumerary tooth may closely resemble the teeth of the group to which it belongs, i.e. molars, premolars or anterior teeth, or it may bear little resemblance in size or shape to which it is associated. Many complications can be associated with supernumeraries, like impaction, delayed eruption or ectopic eruption of adjacent teeth, crowding, development of median diastema and eruption into floor of the nasal cavity. This may also cause the formation of follicular cysts with significant bone destruction. Early intervention to remove it is usually required to obtain reasonable alignment and occlusal relationship. This article will present the clinical management of an (i) impacted supernumerary tooth impeding the eruption of maxillary central incisor and (ii) erupted supernumerary tooth with midline diastema.

  1. [Recent advances in molecular mechanisms of supernumerary tooth formation].

    Science.gov (United States)

    Ge, Li-hong; Wang, Xu

    2013-08-18

    Despite advances in the knowledge of tooth morphogenesis and differentiation, little is relatively known about the aetiology and molecular mechanisms underlying supernumerary tooth formation. Mice, which are commonly used for studying tooth development, only exhibit one dentition. However, a number of mouse models are now starting to provide some insight into the mechanisms that control overall tooth number within the dentition. This review describes recent advances in our understanding of the molecular mechanisms of supernumerary tooth formation. Indeed, many of the molecular signaling pathways known to be involved in normal development of the tooth germ can also give rise to supernumerary teeth if inappropriately regulated. These include components of the Hedgehog, FGF, Wnt and BMP families, which may potentially play a role in human supernumerary tooth formation.

  2. Multiple Geminated Supernumerary Premolars: A Rare Case Report

    Directory of Open Access Journals (Sweden)

    Atul Soin

    2015-01-01

    Full Text Available Supernumerary teeth may be defined as any teeth or tooth substance in excess of the usual configuration of 20 deciduous and 32 permanent teeth. Gemination is defined as an attempt by a single tooth bud to divide, with a resultant formation of either a large tooth with a bifid crown or two completely divided teeth throughout the crown and root. Geminated supernumerary premolar is a rarity and the possibility of multiple occurrences is even rarer. An exhaustive review of English literature and a PubMed search conducted using the terms “gemination’’ and “multiple geminated supernumerary” revealed no case of multiple geminated supernumerary premolars. We report a case of multiple geminated supernumerary premolars in a 23-year-old male.

  3. Supernumerary teeth: an investigating tool in forensic crime investigation.

    Science.gov (United States)

    Multani, Rupinder Kaur; Sangeri, Kishore Kumar; Ramalakshmi, M; Pavithra, S; Rajesh, M; Singh, Laiphrakpam Girindra

    2015-05-01

    Supernumerary tooth is an additional entity to the normal series and is seen in all the quadrants of the jaw. The prevalence rates of supernumerary teeth in the permanent dentition, reported in the literature, vary between 0.1% and 6.9%. The presence of supernumerary teeth may be part of developmental disorders. As supernumerary tooth is a rare condition, it can be used as identification tool for crime investigation. A total of 30 volunteers with a supernumerary tooth were analyzed and casts were made after taking alginate impression. All the casts were coded and were given to five observers for correct identification of those volunteers with respective prepared cast. Personal identification and the cast identification of volunteers were done (cast of the volunteers). The matching identification is followed as below: Of five observers 1(st) observer able to detect 25 (83%), 2(nd) observer 27 (90%), 3(rd) observer 26 (87%), 4(th) observer 25 (83%) and 5(th) observer 28 (91%). As positive matching identification was 87%, supernumerary tooth can be used for crime investigation and used as greatest weapon in criminal identification.

  4. Rare occurrence of bilaterally impacted mandibular supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Vinay Kumar Bhardwaj

    2012-01-01

    Full Text Available Introduction: Supernumerary teeth are present in addition to the normal complement of teeth in permanent or deciduous dentitions. Incidence is high in permanent dentition, affects both the gender. They are more common in males, with the male to female ratio of 2:1. When the supernumerary teeth are causing problems such as, extensive resorption of adjacent teeth, hindering the eruption or malposition of permanent teeth, early surgical intervention is recommended. Case Report: A case of bilaterally impacted supernumerary premolars was reported when an orthopentomograph view was taken which revealed the presence of additional teeth impacted in relation to 35-36 and 45-46. Surgical removal was done as they were resorbing the roots of teeth in their vicinity. Discussion: Literature reports increased occurrence of the supernumeraries in the maxilla but supernumerary premolars are more likely to develop in the mandible. Etiology of supernumerary teeth is ambiguous and is due to following conditions:atavism or reversion, heredity, aberrations during embryologic formation, progress zone, and unified etiologic explanation.

  5. Nonsyndromic multiple supernumerary teeth: A case report of 11 supernumerary teeth

    OpenAIRE

    Balaji Krishnan; Balaji Narasimhan; C Nirupama

    2012-01-01

    Hyperdontia is an odontostomatologic anomaly characterized by an excess in both erupted and non-erupted teeth number. A23-year-old female patient reported to us with a chief complaint of malaligned teeth and inability to maintain oral hygiene. Extraoral examination did not reveal any abnormality. Intraoral examination revealed multiple supernumerary teeth in maxillary and mandibular premolar region. The teeth present were: 11, 12,13,14,16,17,18.21,22,23,24,25,26,27,28,31,32,33, 34, 35. 36, 37...

  6. Paternal isodisomy of chromosome 6 in association with a maternal supernumerary marker chromosome (6)

    Energy Technology Data Exchange (ETDEWEB)

    James, R.S.; Crolla, J.A.; Sitch, F.L. [Salisbury District Hospital, Wiltshire (United Kingdom)] [and others

    1994-09-01

    Uniparental disomy may arise by a number of different mechanisms of aneuploidy correction. A population that has been identified as being at increased risk of aneuploidy are those individuals bearing supernumerary marker chromosomes (SMCs). There have been a number of cases reported of trisomy 21 in association with bi-satellited marker chromosomes have described two individuals with small inv dup (15) markers. One had paternal isodisomy of chromosome 15 and Angelman syndrome. The other had maternal heterodisomy (15) and Prader-Willi syndrome. At the Wessex Regional Genetics Laboratory we have conducted a search for uniparental disomy of the normal homologues of the chromosomes from which SMCs originated. Our study population consists of 39 probands with SMCs originating from a number of different autosomes, including 17 with SMCs of chromosome 15 origin. Using PCR amplification of microsatellite repeat sequences located distal to the regions included in the SMCs we have determined the parental origin of the two normal homologues in each case. We have identified paternal isodisomy of chromosome 6 in a female child with a supernumerary marker ring chromosome 6 in approximately 70% of peripheral blood lymphocytes. The marker was found to be of maternal origin. This is the second case of paternal isodisomy of chromosome 6 to be reported, and the first in association with a SMC resulting in a partial trisomy for a portion of the short arm of chromosome 6. In spite of this, the patient appears to be functioning appropriately for her age.

  7. Supernumerary Primary Teeth : A Consideration of the Developmental Mechanism

    OpenAIRE

    畑,良明/原口,克博/松尾,寿美恵/横内,厚雄/小松,正三/永井,康彦; ハタ,ヨシアキ/ハラグチ,カツヒロ/マツオ,スミエ/ヨコウチ,アツオ/コマツ,マサミ/ナガイ,ヤスヒコ; HATA,Yoshiaki/HARAGUCHI,Katsuhiro/MATSUO,Sumie/YOKOUCHI,Atsuo/KOMATSU,Masami/NAGAI,Yasuhiko

    1992-01-01

    Supernumerary teeth are mostly seen in permanent and mixed dentition, which are originated from permanent teeth. But,supernumerary teeth in primary dentition are very rare. The authors discovered supernumerary tooth (duplicated canine) in the maxillary right primary dentition of 2 years 10 months male infant( Case 1) and supernumerary teeth in both sides between the lateral incisor and canine maxillary primary dentition of 2 years and 9 months male infant(Case 2). We investigated in detail lo...

  8. Non-syndrome associated multiple supernumerary teeth: A report of two cases

    Directory of Open Access Journals (Sweden)

    Nayak Ullal

    2006-05-01

    Full Text Available Multiple supernumerary teeth are usually associated with syndromes. On the contrary, multiple supernumerary teeth without association with any syndromes are very rare. This article presents a report of two cases with multiple supernumerary teeth not associated with any syndrome and emphasizes the routine advice of orthopantomogram whenever a single supernumerary tooth is detected irrespective of whether the patient has any syndrome or not.

  9. Bilateral Maxillary Central Incisor Impaction associated with Developing Supernumerary Premolars in the Mandibular Arch

    Directory of Open Access Journals (Sweden)

    Mitali Mishra

    2014-01-01

    We report a case of 15-year-old girl with bilaterally impacted supernumeraries in the premaxilla region associated with asymptomatic impacted developing supernumerary premolars in the mandibular arch. The supernumeraries of premaxilla region impeded the eruption of the permanent maxillary central incisors. The impacted supernumerary tooth was surgically removed and brackets bonded to the central incisors to apply orthodontic extrusive force which brought the central incisors down to their proper position in the dental arch.

  10. The radiographic localization of unerupted maxillary incisors and supernumeraries

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jae Duk; Lee, Chang Yul; You, Choong Hyun [Chosun University College of Medicine, Kwangju (Korea, Republic of)

    2003-12-15

    To evaluate the use of the vertical tube shift from a panoramic film and a periapical film to localize unerupted maxillary incisors and supernumeraries. The total of 103 displaced maxillary incisors or embedded supernumeraries were examined in this study. The vertical tube shift technique with panoramic and periapical radiography by normal projection taken and compared to localize the position of the embedded maxillary incisors or supernumeraries by a radiologist and 5 general dentists. The gold standard used for the radiographic comparisons was the true position of the embedded tooth as confirmed by horizontal tube shift technique using three periapical radiographs. The general dentist examiners were instructed on the use of the modified acronym 'SLDOBU' by the radiologist as it pertains to panoramic radiographs as the principle of vertical tube shift. All of the embedded maxillary incisors and supernumeraries were successfully located using the vertical tube shift from a panoramic and a maxillary anterior periapical radiograph by the radiologist and 5 general dentists. The use of a panoramic film with a periapical film combination for a vertical tube shift can be useful to localize unerupted maxillary incisors and supernumeraries.

  11. Characteristics of 283 supernumerary teeth in southern Chinese children.

    Science.gov (United States)

    Anthonappa, Robert P; Omer, Rashied S M; King, Nigel M

    2008-06-01

    This was a retrospective study to determine the characteristics and distribution of supernumerary teeth in southern Chinese children. The study population consisted of 208 children aged from 2 to 16 years. Males were more frequently affected than females in the ratio 3.1:1. Of the 283 supernumerary teeth, 95.0% were located in the premaxilla, 71.5% were conical, 70.7% were unilateral, 29.3% were bilateral, 47.7% were inverted, and 16.9% were erupted. The mean age at the time of diagnosis and removal of the supernumerary teeth was 7.3 +/- 2.7 years (the minimum age was 2.1 years) and 8.1+/- 2.7 years (the minimum age was 4.1 years), respectively. Seventy percent of the children were in the mixed dentition and 81.3% of the supernumeraries were removed under general anesthesia. In accordance with previous studies, the majority of the supernumerary teeth were located in the premaxillary region, were conical shaped, and remained unerupted.

  12. Impacted mandibular permanent incisors related to supernumerary teeth: a rare condition.

    Science.gov (United States)

    Nuvvula, Sivakumar; Melkote, Tejas Harsha; Mohapatra, Abinash; Nirmala, S V S G

    2012-01-01

    Supernumerary permanent teeth in the mandibular incisor area are rare, and there are very few reported cases of the supernumerary teeth in the mandibular incisor area leading to impaction of incisors. A south Indian boy aged 14 presented with 3 supernumerary teeth in the mandibular right permanent incisor area resulting in impacted permanent central and lateral incisors.

  13. Taking minutes of meetings

    CERN Document Server

    Gutmann, Joanna

    2016-01-01

    aking Minutes of Meetings guides you through the entire process behind minute taking: arranging the meeting; writing the agenda; creating the optimum environment; structuring the meeting and writing notes up accurately. The minute-taker is one of the most important and powerful people in a meeting and you can use this opportunity to develop your knowledge, broaden your horizons and build credibility within the organization. Taking Minutes of Meetings is an easy to read 'dip-in, dip-out' guide which shows you how to confidently arrange meetings and produce minutes. It provides hands-on advice about the sections of a meeting as well as tips on how to create an agenda, personal preparation, best practice advice on taking notes and how to improve your accuracy. Brand new chapters of this 4th edition include guidance on using technology to maximize effectiveness and practical help with taking minutes for a variety of different types of meetings. The creating success series of books... With over one million copi...

  14. Unique case of a geminated supernumerary tooth with trifid crown

    Energy Technology Data Exchange (ETDEWEB)

    Ather, Amber; Ather, Hunaiza; Sheth, Sanket Milan; Muliya, Vidya Saraswathi [Manipal College of Dental Sciences, Manipal (Korea, Republic of)

    2012-09-15

    Gemination, a relatively uncommon dental anomaly, is characterized by its peculiar representation as a tooth with a bifid crown and a common root and root canal. It usually occurs in primary dentition. To come across gemination in a supernumerary tooth is a rare phenomenon. The purpose of this paper is to present a unique case of hyperdontia wherein gemination in an impacted supernumerary tooth resulted in a trifid crown unlike the usual bifid crown. The role of conventional radiographs as well as computed tomography, to accurately determine the morphology and spatial location, and to arrive at a diagnosis, is also emphasized in this paper.

  15. Impacted supernumerary teeth: a survey of 50 cases.

    Science.gov (United States)

    Nazif, M M; Ruffalo, R C; Zullo, T

    1983-02-01

    Supernumerary teeth are considered one of the most significant dental anomalies during the primary and early mixed dentition stages. A total of 50 patients, ranging in age from 16 months to 17 years, were studied before, during, and after the surgical removal of their supernumerary teeth. Early removal of such teeth is recommended if they impede the eruption of adjacent permanent teeth, appear inverted or rudimentary, or if they are associated with certain pathological conditions. Complications associated with early removal are infrequent and seem minor in nature.

  16. Late-Developing Supernumerary Premolars: Analysis of Different Therapeutic Approaches

    Directory of Open Access Journals (Sweden)

    Sergio Paduano

    2016-01-01

    Full Text Available This case series describes the different potential approaches to late-developing supernumerary premolars (LDSP. LDSP are supernumerary teeth (ST formed after the eruption of the permanent dentition; usually they develop in the premolar region of the upper and lower jaw. The choice to extract or to monitor the LDSP depends on many factors and has to be carefully planned due to the several risks that either the monitoring or the extraction could provoke. These four cases of LDSP showed different treatment plan alternatives derived from a scrupulous assessment of the clinical and radiographic information.

  17. Supernumerary Teeth in Primary Dentition and Early Intervention: A Series of Case Reports

    Science.gov (United States)

    Bahadure, Rakesh N.; Thosar, Nilima; Jain, Eesha S.; Kharabe, Vidhi; Gaikwad, Rahul

    2012-01-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernumerary teeth is important to prevent further complications in permanent dentition. Four cases of supernumerary teeth with mesiodens in upper and lower arch in primary dentition and their management have been discussed. PMID:22888456

  18. Supernumerary Teeth in Primary Dentition and Early Intervention: A Series of Case Reports

    Directory of Open Access Journals (Sweden)

    Rakesh N. Bahadure

    2012-01-01

    Full Text Available Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernumerary teeth is important to prevent further complications in permanent dentition. Four cases of supernumerary teeth with mesiodens in upper and lower arch in primary dentition and their management have been discussed.

  19. Supernumerary teeth in primary dentition and early intervention: a series of case reports.

    Science.gov (United States)

    Bahadure, Rakesh N; Thosar, Nilima; Jain, Eesha S; Kharabe, Vidhi; Gaikwad, Rahul

    2012-01-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernumerary teeth is important to prevent further complications in permanent dentition. Four cases of supernumerary teeth with mesiodens in upper and lower arch in primary dentition and their management have been discussed.

  20. Report of a case with 19 supernumerary teeth in a non-syndromic patient.

    Science.gov (United States)

    Yan, Lei; Yu, Long Wang; Bhandari, Kishor; Shan, Chang Li

    2014-04-01

    Supernumerary teeth occur frequently in human dentition, but presence of multiple supernumerary teeth in patients without any associated syndrome or systemic disorder is a rare phenomenon. Presence of supernumerary teeth in itself is not a problem and may not require removal in all cases but in certain conditions, they may be associated with several clinical complications and require removal. Here, we present a 14 year old female who complained of non emergence of permanent teeth. Orthopantomogram initially showed presence of fifteen impacted supernumerary teeth distributed in all quadrants, but later, cone-beam computed tomography further revealed four additional teeth, totaling to nineteen supernumerary teeth. Consultation with concerned specialists ruled out any syndromes or systemic disorders which led us to the diagnosis of "non-syndromic multiple supernumerary teeth" and this probably is the highest number of supernumerary teeth reported in a single non-syndromic patient till date.

  1. Ring Theory

    CERN Document Server

    Jara, Pascual; Torrecillas, Blas

    1988-01-01

    The papers in this proceedings volume are selected research papers in different areas of ring theory, including graded rings, differential operator rings, K-theory of noetherian rings, torsion theory, regular rings, cohomology of algebras, local cohomology of noncommutative rings. The book will be important for mathematicians active in research in ring theory.

  2. Bilateral Supernumerary Kidneys: Incidental Finding in a Three ...

    African Journals Online (AJOL)

    ... with six kidneys, incidentally diagnosed at ultrasonographic imaging after presenting with an anterior lower chest wall abscess. Confirmation of the diagnosis was confirmed by excretory urography. To our knowledge, this is the highest number of SNK reported. Key Words: Supernumerary kidneys, bilateral, anomaly, infant ...

  3. Prevalence of the morphological types of supernumerary teeth in 5 ...

    African Journals Online (AJOL)

    Background: A Supernumerary tooth is defined as any tooth or odontogenic structure that is formed from the tooth germ and is in excess of the usual number of the dentition in any given region of the dental arch. An excess of the usual configuration may cause malocclusion which may manifest as crowding, delayed eruption ...

  4. Supernumerary heads of biceps brachii muscle in South Indian ...

    African Journals Online (AJOL)

    We studied 40 arms of 20 adult formalin fixed cadavers in the Department of Anatomy, Kasturba Medical College, Manipal, India. The presence of number of additional heads and their details of attachments were studied. We observed presence of supernumerary heads of biceps brachii in 6 (15%) cases, in which having ...

  5. Tooth size patterns in patients with hypodontia and supernumerary teeth.

    Science.gov (United States)

    Brook, A H; Griffin, R C; Smith, R N; Townsend, G C; Kaur, G; Davis, G R; Fearne, J

    2009-12-01

    Anomalies of tooth number may not be isolated conditions but may have wider associations in the development of the dentition including tooth size. This study aimed to examine links between hypodontia, supernumerary teeth and crown size, considering the effect on the development of the whole dentition and so increase understanding of the aetiology of these conditions. The patients, who were all of European ancestry, were 60 young adults (30 males and 30 females) with hypodontia and 60 age and sex matched controls together with 60 young adults (39 males and 21 females) with supernumerary teeth and 60 age and sex matched controls. Hand measurements of mesiodistal and buccolingual dimensions were made of the teeth on dental study models using Mitutoyo electric callipers. The mean value of two measurements was used and intra-operator and inter-operator reliability determined. Patients with hypodontia had smaller teeth than the control group and this difference was statistically significant (pteeth except the MD dimensions of 13, 23, 24 and 44. The difference in size was greatest for the BL dimensions in hypodontia patients. Further, the greater the number of missing teeth the smaller the tooth size. The hypodontia patients also showed higher variability in tooth dimensions than the control group. Patients with supernumerary teeth had larger teeth than the controls, with the greatest differences in the MD dimensions. In both hypodontia and supernumerary patients the differences in tooth size were generalised throughout the dentition. In anomalies of tooth number the size of teeth is also involved. In patients with hypodontia and supernumerary teeth the crown size of the whole dentition is affected. These findings are compatible with a multifactorial aetiology of these conditions.

  6. 10 Minutes of Bliss

    Science.gov (United States)

    Smith, Olynda

    2014-01-01

    For many of us, it is challenging to find the time to sleep enough each night or to sit down for a meal. So how can this author convince you that taking 10 minutes to do anything every day is actually worth it? The benefits of meditation--increased calm, clarity, compassion, and empathy, to name a few--have been known for centuries. Recently,…

  7. A novel mutation of adenomatous polyposis coli (APC) gene results in the formation of supernumerary teeth.

    Science.gov (United States)

    Yu, Fang; Cai, Wenping; Jiang, Beizhan; Xu, Laijun; Liu, Shangfeng; Zhao, Shouliang

    2017-08-07

    Supernumerary teeth are teeth that are present in addition to normal teeth. Although several hypotheses and some molecular signalling pathways explain the formation of supernumerary teeth, but their exact disease pathogenesis is unknown. To study the molecular mechanisms of supernumerary tooth-related syndrome (Gardner syndrome), a deeper understanding of the aetiology of supernumerary teeth and the associated syndrome is needed, with the goal of inhibiting disease inheritance via prenatal diagnosis. We recruited a Chinese family with Gardner syndrome. Haematoxylin and eosin staining of supernumerary teeth and colonic polyp lesion biopsies revealed that these patients exhibited significant pathological characteristics. APC gene mutations were detected by PCR and direct sequencing. We revealed the pathological pathway involved in human supernumerary tooth development and the mouse tooth germ development expression profile by RNA sequencing (RNA-seq). Sequencing analysis revealed that an APC gene mutation in exon 15, namely 4292-4293-Del GA, caused Gardner syndrome in this family. This mutation not only initiated the various manifestations typical of Gardner syndrome but also resulted in odontoma and supernumerary teeth in this case. Furthermore, RNA-seq analysis of human supernumerary teeth suggests that the APC gene is the key gene involved in the development of supernumerary teeth in humans. The mouse tooth germ development expression profile shows that the APC gene plays an important role in tooth germ development. We identified a new mutation in the APC gene that results in supernumerary teeth in association with Gardner syndrome. This information may shed light on the molecular pathogenesis of supernumerary teeth. Gene-based diagnosis and gene therapy for supernumerary teeth may become available in the future, and our study provides a high-resolution reference for treating other syndromes associated with supernumerary teeth. © 2017 The Authors. Journal of

  8. Five minutes of heaven

    Directory of Open Access Journals (Sweden)

    Manuel Gárate

    2009-05-01

    Full Text Available Ganadora del principal premio del festival de cine de Sundance, “Five minutes of Heaven” constituye uno de aquellos filmes que demuestran que la calidad  y un presupuesto limitado pueden ir perfectamente de la mano, y alcanzar momentos de enorme calidad cinematográfica basados en un buen guión y una excelente dirección de actores. El realizador Olivier Hirschbiegel nos demuestra en esta película nuevamente su capacidad para entregarnos una obra de ficción sin dejar de lado su preocupación po...

  9. Prevalence, characteristics, and complications of supernumerary teeth in nonsyndromic pediatric population of South India: A clinical and radiographic study

    Directory of Open Access Journals (Sweden)

    Gibi Syriac

    2017-01-01

    Full Text Available Introduction: Supernumerary teeth are the presence of more number of teeth over the normal dental formula and may occur in permanent as well as early mixed dentition. This study determined the prevalence, characteristics, and complications caused by supernumerary teeth in nonsyndromic South Indian pediatric population. Materials and Methods: Characteristics of supernumerary teeth determined by clinical and radiographic examination were recorded. The age, sex, number of supernumerary teeth, eruption status, morphology, position, orientation, and complications (if any associated with supernumerary teeth were recorded for each patient who had supernumerary teeth. The data collected were statistically analyzed. Results: Supernumerary teeth were detected in 45 subjects (1.1%, of which 34 (75.6% were male and 11 (24.4% were female. There was no association between the number of supernumerary teeth and the gender of the patient. The total number of supernumerary teeth among the affected 45 patients was 54. The average number of supernumerary teeth per person was 1.2. The number of supernumerary teeth was one in 35 cases, two in 8 cases, and 3 in 1 case. Of the 45 patients, 8 patients with supernumerary teeth were in deciduous dentition stage, 29 patients were in mixed dentition stage, and 8 patients were in permanent dentition stage. Most supernumerary teeth presented in the anterior maxilla. Morphologically, conical-shaped supernumerary teeth were the most common finding. 68.5% of supernumerary teeth presented with straight orientation and inverted orientation was seen in 24.1%. Complications seen in patients with supernumerary teeth were delayed or noneruption of adjacent tooth malposition or rotation of adjacent teeth, diastema formation, and formation of dentigerous cyst. Conclusions: Supernumerary teeth have an incidence of 1.1% in South Indian population and can cause many complications that can harm the developing occlusion. Knowledge about

  10. Bilateral molariform supernumerary teeth in the anterior maxilla: a report of two cases.

    Science.gov (United States)

    Ozden, Mehmet Cem; Taysi, Mert; Cankaya, A Burak; Yildirim, Mustafa Sami

    2017-01-01

    Supernumerary teeth are additional teeth besides the normal series and can be found in any region of the dental arch. Supernumerary teeth can be classified according to their form and locations. Early diagnosis and treatment of patients with supernumerary teeth may prevent or minimize complications. The treatment options depend on the type and position of the supernumerary tooth and its effect on the adjacent structures. Two male patients were referred to our clinic due to swelling in their maxillae and interrupted eruption of teeth. Upon radiological examination of the patients, impacted supernumerary teeth were found. Surgical removal of these teeth were perfomed and they were found to be molariform. We aim to present the two rare cases of molariform supernumerary teeth in this article.

  11. Impacted maxillary anterior supernumerary teeth: a survey of forty-two cases.

    Science.gov (United States)

    Yoon, Richard K; Chussid, Steven; Davis, Martin J

    2008-11-01

    The purpose of this retrospective study was to examine the location of impacted maxillary anterior supernumerary teeth that subsequently were removed from pediatric patients at Children's Hospital of New York-Presbyterian. The study population consisted of 42 children diagnosed with impacted maxillary anterior supernumerary teeth. The impacted maxillary anterior supernumerary teeth were surgically removed by one faculty member in the hospital operating room with the aid of general anesthesia between 1994 and 2000. The total number of impacted maxillary anterior supernumerary teeth was 51. All were located palatally on either side of the midline and were surgically removed from a palatal access. In the absence of clear imaging evidence to the contrary, it is recommended that the preferred surgical approach for the removal of impacted maxillary anterior supernumerary teeth should be the palatal approach. Relatedly, the term mesiodens is misleading and is generally inaccurate for describing impacted maxillary anterior supernumerary teeth. Palatodens would be a more appropriate descriptive term.

  12. BILATERAL MOLARIFORM SUPERNUMERARY TEETH IN THE ANTERIOR MAXILLA: A REPORT OF TWO CASES

    Directory of Open Access Journals (Sweden)

    Mehmet Cem ÖZDEN

    2017-01-01

    Full Text Available Supernumerary teeth are additional teeth besides the normal series and can be found in any region of the dental arch. Supernumerary teeth can be classified according to their form and locations. Early diagnosis and treatment of patients with supernumerary teeth may prevent or minimize complications. The treatment options depend on the type and position of the supernumerary tooth and its effect on the adjacent structures. Two male patients were referred to our clinic due to swelling in their maxillae and interrupted eruption of teeth. Upon radiological examination of the patients, impacted supernumerary teeth were found. Surgical removal of these teeth were perfomed and they were found to be molariform. We aim to present the two rare cases of molariform supernumerary teeth in this article.

  13. Mesiodens with an unusual morphology and multiple impacted supernumerary teeth in a non-syndromic patient

    Directory of Open Access Journals (Sweden)

    Srivatsan Pavithra

    2007-01-01

    Full Text Available Supernumerary teeth are a relatively frequent disorder of odontogenesis characterized by an excess number of teeth. Mesiodens is the most common type of supernumerary tooth found in the premaxilla between the two central incisors. They can be supplemental (resembling natural teeth, conical, tuberculate or molariform. We present the case of a 19 year-old girl who presented with a mesiodens of an unusual morphology and multiple impacted supernumerary teeth not associated with any syndrome.

  14. Mesiodens with an unusual morphology and multiple impacted supernumerary teeth in a non-syndromic patient.

    Science.gov (United States)

    Srivatsan, Pavithra; Aravindha Babu, N

    2007-01-01

    Supernumerary teeth are a relatively frequent disorder of odontogenesis characterized by an excess number of teeth. Mesiodens is the most common type of supernumerary tooth found in the premaxilla between the two central incisors. They can be supplemental (resembling natural teeth), conical, tuberculate or molariform. We present the case of a 19 year-old girl who presented with a mesiodens of an unusual morphology and multiple impacted supernumerary teeth not associated with any syndrome.

  15. Investigation of impacted supernumerary teeth: a cone beam computed tomograph (cbct) study

    OpenAIRE

    Gurler, Gokhan; Delilbasi, Cagri; Delilbasi, Evren

    2017-01-01

    Purpose: The purpose of this study was to investigate the impacted supernumerary teeth which were initially detected on panoramic radiographs by using cone beam computed tomography (CBCT). Materials and Methods: In this retrospective study, supernumerary teeth diagnosed on panoramic radiographs taken from patients who had admitted for routine dental treatment were evaluated using CBCT. Patients’ age, gender, systemic conditions as well as number of supernumerary teeth, unilateral-bilateral...

  16. Supernumerary Teeth in the Maxillary Anterior Region: The Dilemma of Early Versus Late Surgical Intervention.

    Science.gov (United States)

    Sarne, Ofer; Shapira, Yehoshua; Blumer, Sigalit; Finkelstein, Tamar; Schonberger, Shirley; Bechor, Naomi; Shpack, Nir

    2017-09-22

    Supernumerary teeth are the most common developmental dental anomalies in the maxillary anterior region causing interference to the developing permanent incisors resulting in poor dental and facial esthetics. Two different opinions regarding the timing for surgical removal of the supernumerary teeth are presented. In this case report, three brothers with supernumerary teeth in the maxillary anterior region are presented, their surgical and orthodontic management and outcome are discussed.

  17. Supernumerary Teeth in Primary Dentition and Early Intervention: A Series of Case Reports

    OpenAIRE

    Bahadure, Rakesh N.; Nilima Thosar; Jain, Eesha S; Vidhi Kharabe; Rahul Gaikwad

    2012-01-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernume...

  18. Prevalence and characteristics of supernumerary teeth in a non-syndromic South Indian pediatric population

    OpenAIRE

    Rajesh T Anegundi; Veeresh S Tegginmani; Prashant Battepati; Anand Tavargeri; Shruthi Patil; Vijay Trasad; Garima Jain

    2014-01-01

    Background: Supernumerary teeth are one of the most widely reported and significant anomaly in patients affecting the primary and early mixed dentition. Aim: To describe the distribution and characteristics of the supernumerary teeth in South Indian population of paediatric patients. Design: In a 12 year retrospective study, a total of 63,569 patients up to the age of 14 years who visited our department between June 2003 and May 2013 were revised.790 cases of supernumerary teeth were found. P...

  19. CSEWG 2017 Minutes

    Energy Technology Data Exchange (ETDEWEB)

    Brown, D. [Brookhaven National Lab. (BNL), Upton, NY (United States); Sonzogni, A. [Brookhaven National Lab. (BNL), Upton, NY (United States); Chadwick, M. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Trkov, Andrej [Intl Atomic Energy Agency (IAEA), Vienna (Austria); Dunn, M. [SprectraTech, Oak Ridge, TN (United States); Danon, Y. [Rensselaer Polytechnic Inst., Troy, NY (United States); Neudecker, D. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-11-28

    These are the minutes of the 2017 Cross Section Evaluation Working Group (CSEWG). This meeting corresponds to the 50±1th anniversary of CSEWG. The uncertainty on the anniversary reflects the fact that CSEWG was formed in 1966 yet the first ENDF library was published in 1968. Despite the uncertainty on the date of the anniversary, this meeting is an especially auspicious one: this is the last meeting before the release of ENDF/B-VIII.0. This meeting is devoted both to closing out the last open issues before releasing the library and to looking toward the future. The careful reader should note that there are no closing statements in this meeting. This is in a way symbolic of the fact that since ENDF/B is always improving, our work here will never truly be done.

  20. Characteristics of premaxillary supernumerary teeth in primary and mixed dentitions: a retrospective analysis of 212 cases.

    Science.gov (United States)

    Shekhar, Madiraju G

    2012-08-01

    To investigate the characteristics and distribution of premaxillary supernumerary teeth affecting primary and mixed dentitions in Indian children. This retrospective analysis included 11 200 children, aged 3-12 years, who attended a pediatric dental clinic for dental care during the period 2007-2010. The children were divided into group I (aged 3-6 years) and group II (aged 7-12 years), and data regarding maxillary anterior supernumerary teeth, diagnosed both as isolated and/or as unexpected findings during routine clinical and radiological examinations, were gathered. Pearson's χ(2) -test, with a 0.05 level of significance, was used for the analysis. The overall prevalence of premaxillary supernumerary teeth in primary and mixed dentitions was 1.9%. Single supernumerary teeth (84.9%) and conical morphology (68.7%) were commonly seen in both groups. The most common sagittal position was palatal (92.3%) among both erupted and impacted maxillary anterior supernumerary teeth. The prevalence of premaxillary supernumerary teeth in Indian children found in this study was 1.9%, with an overall male to female ratio of 1.7:1. Single supernumerary teeth, conical morphology, and erupted supernumerary teeth were the most commonly seen. Supernumerary teeth associated with clinical complications were relatively low (48%), and axial rotation or displacement of maxillary incisors was the most common sequelae. © 2012 Blackwell Publishing Asia Pty Ltd.

  1. Prevalence and characteristics of supernumerary teeth in a non-syndromic South Indian pediatric population

    Directory of Open Access Journals (Sweden)

    Rajesh T Anegundi

    2014-01-01

    Full Text Available Background: Supernumerary teeth are one of the most widely reported and significant anomaly in patients affecting the primary and early mixed dentition. Aim: To describe the distribution and characteristics of the supernumerary teeth in South Indian population of paediatric patients. Design: In a 12 year retrospective study, a total of 63,569 patients up to the age of 14 years who visited our department between June 2003 and May 2013 were revised.790 cases of supernumerary teeth were found. Patients were evaluated for age, sex, site, status of dentition, number, position, orientation and type of supernumerary teeth. Statistical analysis was carried out using chi square test. Results: 790 subjects with supernumerary teeth (481 males and 309 females were detected, revealing male-female ratio of 1.55:1.The most common supernumerary teeth were mesiodens (82.28%, the most common site was the anterior maxilla (92.53%region. Majority of patients had a single erupted supernumerary oriented straight in the arch. Patients in mixed dentition stage reported with maximum number of supernumerary teeth. Conclusions: The prevalence of supernumerary teeth in non syndromicSouth Indian paediatric population is 1.24% with slight male predilection and conical mesiodens being the commonest.

  2. The Diagnosis and Management of Multiple Supernumerary Teeth Involving Both Jaws.

    Science.gov (United States)

    Öz, A Alper; Baş, Burcu; Öz, Aslihan Zeynep

    2015-01-01

    Supernumerary teeth are frequently seen anomalies however its occurrence in both jaws is rare without being associated with complex syndromes. This case report describes the orthodontic and surgical treatment of a 13-year-old boy with nonsyndromal multiple and abnormal supernumerary teeth. The patient had several erupted and unerupted supernumerary teeth involving both jaws. Two abnormal tuberculate type erupted supernumerary teeth were present at the site of upper central incisors which leads to the impaction of the permanent incisors. In this report, clinical and radiographic evaluation as well as the treatment alternatives of this rare case was presented.

  3. Prevalence and characteristics of supernumerary teeth in a non-syndromic South Indian pediatric population.

    Science.gov (United States)

    Anegundi, Rajesh T; Tegginmani, Veeresh S; Battepati, Prashant; Tavargeri, Anand; Patil, Shruthi; Trasad, Vijay; Jain, Garima

    2014-01-01

    Supernumerary teeth are one of the most widely reported and significant anomaly in patients affecting the primary and early mixed dentition. To describe the distribution and characteristics of the supernumerary teeth in South Indian population of paediatric patients. In a 12 year retrospective study, a total of 63,569 patients up to the age of 14 years who visited our department between June 2003 and May 2013 were revised.790 cases of supernumerary teeth were found. Patients were evaluated for age, sex, site, status of dentition, number, position, orientation and type of supernumerary teeth. Statistical analysis was carried out using chi square test. 790 subjects with supernumerary teeth (481 males and 309 females) were detected, revealing male-female ratio of 1.55:1.The most common supernumerary teeth were mesiodens (82.28%), the most common site was the anterior maxilla (92.53%)region. Majority of patients had a single erupted supernumerary oriented straight in the arch. Patients in mixed dentition stage reported with maximum number of supernumerary teeth. The prevalence of supernumerary teeth in non syndromic South Indian paediatric population is 1.24% with slight male predilection and conical mesiodens being the commonest.

  4. Dentigerous cyst in a child associated with multiple inverted supernumerary teeth: a rare occurrence.

    Science.gov (United States)

    Agrawal, Neeraj K

    2012-01-01

    Dentigerous cysts associated with supernumerary teeth are rare with most of them developing around a mesiodens in the anterior maxilla. Dentigerous cysts from multiple supernumerary teeth, especially with inverted tooth, are rare in other regions of the maxilla. We report a unique case of a dentigerous cyst in a child associated with multiple inverted supernumerary teeth and relevant review of literarature. Dentigerous cyst arising from multiple supernumerary teeth and not anterior maxillary mesiodens is quite uncommon. In a child, such findings associated with inverted tooth are still rare. Such cysts should be managed by excision as soon as possible.

  5. Cone beam computed tomography for diagnosis and treatment planning of supernumerary teeth.

    Science.gov (United States)

    Gurgel, Carla Vecchione; Costa, Ana Lidia Soares; Kobayashi, Tatiana Yurico; Rios, Daniela; Silva, Salete Moura Bonifacio; Machado, Maria Aperecida de Andrade Moreira; Oliveira, Thais Marchini

    2012-01-01

    Conventional radiographic images are frequently used to detect supernumerary teeth. However, recent developments in 3D imaging systems have enabled dentists to better visualize supernumerary teeth, with better contrast and more details. Cone beam computed tomography (CBCT) has improved diagnosis and treatment planning of patients with supernumerary teeth. The decision to use CBCT should be based on the diagnostic information required. This article presents three case reports of patients with supernumerary teeth to demonstrate the need for accurate diagnosis and treatment planning based on a comprehensive evaluation using CBCT.

  6. [Evaluation of cone-beam CT in diagnosis of supernumerary teeth in the anterior maxilla].

    Science.gov (United States)

    Wen, Chenni; Li, Guo; Ren, Jiayin; Zheng, Guangning

    2012-08-01

    To evaluate the value of cone-beam CT (CBCT) in the diagnosis and orientation of supernumerary teeth in the anterior maxilla. 195 supernumerary teeth in the anterior maxilla of 146 patients were included, which were examined by CBCT. The number, shape, size, 3-dimensional position, growth direction of the supernumeraries and their relationship with the neighboring teeth were analyzed. The 146 patients aged from 5 to 39, and males were affected more than females in a ratio of 2.95:1. 102 (69.9%) patients had single supernumerary teeth. Of the 195 supernumerary teeth, 126 (64.6%) were near the middle line, 131 (67.2%) were conical, 51 (26.2%) were curved root, 98 (50.3%) were inverted and had a length of (11.97 +/- 2.40) mm. The supernumerary teeth often caused complications. The position of the supernumerary teeth is varied in the maxilla, and often causes permanent dentition complications. CBCT imaging yields accurate 3-dimensional pictures of supernumerary teeth, local dental and bony structures, which is helpful for diagnosis and orientation of supernumerary teeth.

  7. Prevalence and morphology of supernumerary teeth in the population of a Swiss community. Short communication.

    Science.gov (United States)

    Schmuckli, Regula; Lipowsky, Claudia; Peltomäki, Timo

    2010-01-01

    The objective of the study was to determine the current prevalence of supernumerary teeth (PST) in the population of a Swiss community. 3,004 orthopantomograms (OPTs) routinely produced during the annual school dental examinations in the Winterthur municipality from 1990 to 2005 served as the study basis (average age 9.45 years, 1391 girls, 1613 boys, age range 6-15 years). The study found 44 supernumerary teeth, which yields a prevalence of 1.5%. The prevalence among boys was higher than among girls, with 1.1% and 0.4%, respectively. The greatest proportion of supernumerary teeth was found in the maxillary anterior region (38 of 44 teeth, 86%). Based on their position, 33 of these were classified as mesiodens. Five supernumerary teeth had the same shape as a maxillary lateral incisor. In the mandibular anterior region, five supernumerary teeth were shaped the same as the permanent mandibular incisors. 70% of the supernumerary teeth were conical. The prevalence of supernumerary teeth is low (1.5%) and comparable to similar studies in the literature. The majority (86%) of supernumerary teeth are located in the maxillary anterior region. Thus, in the case of retention or delayed eruption, dentists should bear in mind that supernumerary teeth may be the cause.

  8. Non-syndrome patient with bilateral supernumerary teeth: Case report and 9-year follow-up.

    Science.gov (United States)

    Akgun, Ozlem Marti; Sabuncuoglu, Fidan; Altug, Ayberk; Altun, Ceyhan

    2013-01-01

    The presence of supernumerary teeth, also known as hyperdontia, is the condition of having teeth in addition to the regular number of teeth. The occurrence of multiple supernumerary teeth is often found in association with syndromes such as Gardner syndrome, Anderson-Fabry disease, Ellis-van Creveld syndrome, Ehlers-Danlos syndrome, incontinentia pigmenti, and Tricho-rhino-phalangeal syndrome. Only a few examples of nonsyndromic multiple supernumerary teeth have been reported in literature. In this report, we present the unusual case and 9-year follow up of a non-syndrome female patient with bilateral supernumerary teeth that occurred with an interval of several years.

  9. Prevalence of impacted and supernumerary teeth in the North Indian population.

    Science.gov (United States)

    Patil, Santosh; Maheshwari, Sneha

    2014-04-01

    Dental impaction is a very frequent problem. Supernumerary teeth, or hyperdontia, are the presence of additional teeth to the normal series in the either of the dentition. The presence of impacted and/or supernumerary teeth can cause various complications. The objective of the present study was to determine the prevalence of impacted and supernumerary teeth in the North Indian population. The panoramic radiographic records of 4750 patients attending the Department of Oral Medicine and Radiology, Jodhpur Dental College General Hospital between September 2008 to December 2012 were examined for this retrospective study. The ages of the patients ranged from 8 to 72 years, with a mean of 34.6 years. A total of 798 (16.8%) patients presented with 1126 impacted teeth. Impacted canines were the most prevalent (9.7%), followed by impacted premolars (4.3%). Supernumerary teeth (1.6%) and impacted molars (1.2%) were less prevalent. Among the 842 impacted teeth, the most frequently affected teeth were the canines (56.7%), followed by premolars (27.8%), and supernumerary teeth (9.3%), while the prevalence of impacted molars was quite lower (6.2%). The most frequently impacted teeth were maxillary canines and the mesiodens were the most common supernumerary tooth. The early diagnosis of supernumerary and impacted teeth is essential to prevent malocclusion and malalignment of permanent teeth demonstrating the importance of panoramic radiographs in their detection. Key words:Impacted, supernumerary, prevalence, canines, mesiodens.

  10. Radiographic Follow-Up during Orthodontic Treatment for Early Diagnosis of Sequential Supernumerary Teeth.

    Science.gov (United States)

    Suga, Selma Sano; Kruly, Paula de Castro; Garrido, Talissa Mayer; Matumoto, Marise Sano Suga; Suga, Uhana Seifert Guimarães; Terada, Raquel Sano Suga

    2016-01-01

    Most supernumerary teeth are impacted and asymptomatic. Objective. The aim of this paper is to describe two cases of sequential development of supernumerary teeth in the mandibular premolar region, identified during orthodontic treatment. Reports. The first case describes the radiographic follow-up of a female patient that presented a supernumerary tooth at the age of 9 years and 10 months in the right mandibular premolar region, followed by a further supernumerary tooth in the left mandibular premolar region identified at the age of 11 years and 3 months. In the second case, the radiographic follow-up of a male patient demonstrated 3 supernumerary teeth in the premolar region at the age of 16 years. During orthognathic surgery planning at the age of 20 years and 5 months, a supplemental supernumerary tooth was found in the left mandibular region. Conclusion. Considering the late developing of supernumerary premolars, appropriate follow-up with panoramic radiographs of patients with previous experience of supernumerary teeth is essential for early diagnosis of supplemental premolars to prevent possible complications.

  11. An unusual cause of epistaxis in a young patient: the supernumerary nasal tooth.

    Science.gov (United States)

    Krishnan, B; Parida, Pradipta Kumar; Gopalakrishnan, S; Satyparakash, M V S

    2013-12-01

    Eruption of supernumerary teeth into the nasal cavity is a rare pathological condition. Identification of such teeth is important as they can sometimes cause significant morbidity. This report describes a young female patient with a complaint of epistaxis from the right nasal cavity. The diagnosis of a supernumerary nasal tooth was confirmed by computed tomography and the tooth was removed endoscopically with minimal morbidity.

  12. The study of impacted and supernumerary teeth in young man by the full mouth roentgenograms

    Energy Technology Data Exchange (ETDEWEB)

    Ahn, Hung Kyu [Department of Dental Radiology, College of Dentistry, Seoul National University, Seoul (Korea, Republic of)

    1977-11-15

    The author has observed 906 full mouth roentgenograms in Korean young man who had the impacted and supernumerary teeth. Impacted and supernumerary teeth were analysed upon several items, such as incidences and positions in the dental arch . The results were as follows; 1. The incidences of impacted teeth were 59.05%, and the ratio of upper jaw to lower one was 1:3. 2. The frequency of the supernumerary teeth were 5.52%, and the ratio of maxilla to mandible was 49:1. 3. No significant differences between right and left side in both jaws, but incidence rate of the supernumerary teeth was 74% in the maxillary central incisor area. 4. The positions of impacted and supernumerary teeth were vertical and inverted shapes in maxilla, whereas horizontal a nd mesio-angular forms in mandible.

  13. Non-syndromic multiple supernumerary premolars: Clinicoradiographic report of five cases

    Science.gov (United States)

    Tanwar, Renu; Jaitly, Vipul; Sharma, Aadya; Heralgi, Rashmi; Ghangas, Munish; Bhagat, Ankur

    2017-01-01

    Hyperdontia or supernumerary teeth in both arches without any syndromic manifestation are extremely rare. Supernumerary teeth are commonly associated with Gardner’s syndrome, cleft lip and palate, cleidocranial dysplasia and trichorhinopha-langeal syndrome. Five cases of non-syndromic multiple premolars of maxillary and mandibular arches in Indian patients are presented here. This case series reports three cases with multiple (9 in maximum), bilaterally impacted and erupted supernumerary teeth and two cases with supernumerary premolars in non-syndromic cases from Indian patients. Supernumerary teeth can be present in any region of the oral cavity. Although the occurrence of maxillary para-premolars is rare, radio-logical investigations play a major and decisive role in determining the management of such cases. PMID:28413596

  14. Non-syndromic multiple supernumerary premolars: Clinicoradiographic report of five cases

    Directory of Open Access Journals (Sweden)

    Renu Tanwar

    2017-03-01

    Full Text Available Hyperdontia or supernumerary teeth in both arches without any syndromic manifestation are extremely rare. Supernumerary teeth are commonly associated with Gardner’s syndrome, cleft lip and palate, cleidocranial dysplasia and trichorhinopha-langeal syndrome. Five cases of non-syndromic multiple premolars of maxillary and mandibular arches in Indian patients are presented here. This case series reports three cases with multiple (9 in maximum, bilaterally impacted and erupted supernumerary teeth and two cases with supernumerary premolars in non-syndromic cases from Indian patients. Supernumerary teeth can be present in any region of the oral cavity. Although the occurrence of maxillary para-premolars is rare, radio-logical investigations play a major and decisive role in determining the management of such cases.

  15. Clinical and radiological evaluation of inverse impaction of supernumerary teeth.

    Science.gov (United States)

    Tuna, Elif-Bahar; Kurklu, Esma; Gencay, Koray; Ak, Gulsum

    2013-07-01

    To describe the clinical and radiological features of children with inverted supernumerary teeth. Thirty eight patients with inverted supernumerary teeth (ST) were enrolled in this descriptive and restrospective study. Data from patient records including age, gender, status of dentition, number of ST, number of ST in inverted position, coexistence of ST in inverted and normal direction of eruption, location, orientation, morphology, clinical complications, management and radiography were assessed during 3-years period. Thirty eight patients with a mean age of 9.10 ± 1.97 years (range:6-13) and a strong male preponderance of 3.7:1 (male:30, female:8) had a total of 69 ST, of which 41 were in inverted position. Thirty five patients had one (92.1%) inverted tooth, whereas 3 patients had two inverted teeth per case (7.9%). All cases were located in the maxilla. Midline was the most frequent site for the single inverted supernumerary tooth in 18 (47.4%) patients, followed equally by the right and left premaxillary region in 10 patients each (26.3%). Regarding morphology, 30 patients had conical (78.9%) and 8 (21.1%) had incisiform ST. No tuberculate shaped ST was detected. There was no statistically significant difference between number of inverted teeth and delayed tooth eruption, diastema, local malocclusion, palatinal swelling (p>0.05). There was no statistically significant difference between complications and age (p>0.05). Surgical removal at the time of diagnosis with subsequent follow-up during completion of permanent dentition was the treatment approach in all cases. Thorough clinical examination followed by a comprehensive radiographic screening is the crucial determinant of an accurate diagnosis of an impacted ST. Early diagnosis and timely management are key factors to prevent or minimize the complications, which may influence function and esthetics of the teeth and even psychological condition of the growing child.

  16. Investigation of impacted supernumerary teeth: a cone beam computed tomograph (cbct) study.

    Science.gov (United States)

    Gurler, Gokhan; Delilbasi, Cagri; Delilbasi, Evren

    2017-01-01

    The purpose of this study was to investigate the impacted supernumerary teeth which were initially detected on panoramic radiographs by using cone beam computed tomography (CBCT). In this retrospective study, supernumerary teeth diagnosed on panoramic radiographs taken from patients who had admitted for routine dental treatment were evaluated using CBCT. Patients' age, gender, systemic conditions as well as number of supernumerary teeth, unilateral-bilateral presence, anatomical localization (maxilla, mandible, anterior-premolar-molar, mesiodens-lateral-canine, parapremolar-paramolar-distomolar) shape (rudimentary, supplemental, tuberculate, odontoma), position (palatal-lingual-buccal-labial-central), shortest distance between the tooth and adjacent cortical plate, complications and treatment were assessed. A total of 47 impacted supernumerary teeth in 34 patients were investigated in this study. Of these, 33 (70.2%) were unilateral and 14 (29.8%) were bilateral. Only 1 supernumerary tooth was found in 27 patients (79.4%) whereas 7 patients (20.6%) had 2 or more supernumerary teeth. Most of the teeth located in the anterior region (74.4%) of the jaws and maxilla (74.4%). Twenty teeth (42.5%) were mesiodens, 11 (23.4%) were lateral or canine, 14 (29.7%) were parapremolar and 2(4.4%) were distomolar. Twenty-seven teeth (57.4%) were rudimentary, 15 (31.9%) were supplemental and 5 (10.7%) were odontoma in shape. The shortest distance between the supernumerary tooth and adjacent cortical plate varied between 0 to 2.5 mm with a mean of 0.66 mm. The most common clinical complaint was the non-eruption of permanent teeth (42.5%). All supernumerary teeth were removed under local anesthesia. Orthodontic traction was performed for those impacted permanent teeth if necessary. Impacted supernumerary teeth are usually in close proximity to cortical bone. Although this may facilitate surgical access, there is a risk of damaging surrounding anatomical structures. Therefore, CBCT

  17. White Ring; White ring

    Energy Technology Data Exchange (ETDEWEB)

    Aoki, H.; Yuzawa, H. [Nikken Sekkei Ltd., Osaka (Japan)

    1998-01-05

    White Ring is a citizen`s gymnasium used for figure skating and short track speed skating games of 18th Winter Olympic Games in 1998. White Ring is composed of a main-arena and a sub-arena. For the main-arena with an area 41mtimes66m, an ice link can be made by disengaging the potable floor and by flowing brine in the bridged polystyrene pipes embedded in the concrete floor. Due to the fortunate groundwater in this site, well water is used for the outside air treatment energy in 63% during heating and in 35% during cooling. Ammonia is used as a cooling medium for refrigerating facility. For the heating of audience area in the large space, heat load from the outside is reduced by enhancing the heat insulation performance of the roof of arena. The audience seats are locally heated using heaters. For the White Ring, high quality environment is realized for games through various functions of the large-scale roof of the large space. Success of the big event was expected. 15 figs., 4 tabs.

  18. Genetics and presence of non-syndromic supernumerary teeth: A mystery case report and review of literature

    Directory of Open Access Journals (Sweden)

    Neha Khambete

    2012-01-01

    Full Text Available Presence of supernumerary teeth is well-recognized clinical phenomenon. However, it is uncommon to find multiple supernumeraries in individuals with no other associated disease or syndrome. Presence of multiple supernumerary teeth is thought to have genetic component. We report a rare case where multiple supernumerary teeth were seen without presence of any other syndrome in 3 generations; father, son, and two grandsons. We also present a review of similar cases published in literature till date. The role of genetics in development of supernumerary teeth is highlighted.

  19. Unexpected structural complexity of supernumerary marker chromosomes characterized by microarray comparative genomic hybridization

    Directory of Open Access Journals (Sweden)

    Hing Anne V

    2008-04-01

    Full Text Available Abstract Background Supernumerary marker chromosomes (SMCs are structurally abnormal extra chromosomes that cannot be unambiguously identified by conventional banding techniques. In the past, SMCs have been characterized using a variety of different molecular cytogenetic techniques. Although these techniques can sometimes identify the chromosome of origin of SMCs, they are cumbersome to perform and are not available in many clinical cytogenetic laboratories. Furthermore, they cannot precisely determine the region or breakpoints of the chromosome(s involved. In this study, we describe four patients who possess one or more SMCs (a total of eight SMCs in all four patients that were characterized by microarray comparative genomic hybridization (array CGH. Results In at least one SMC from all four patients, array CGH uncovered unexpected complexity, in the form of complex rearrangements, that could have gone undetected using other molecular cytogenetic techniques. Although array CGH accurately defined the chromosome content of all but two minute SMCs, fluorescence in situ hybridization was necessary to determine the structure of the markers. Conclusion The increasing use of array CGH in clinical cytogenetic laboratories will provide an efficient method for more comprehensive characterization of SMCs. Improved SMC characterization, facilitated by array CGH, will allow for more accurate SMC/phenotype correlation.

  20. Surgical management of multiple supernumerary teeth and an impacted maxillary permanent central incisor.

    Science.gov (United States)

    Rallan, Mandeep; Rallan, Neelakshi Singh; Goswami, Mousumi; Rawat, Kamini

    2013-05-22

    Hyperdontia is the condition of having supernumerary teeth, or teeth which appear in addition to the regular number of teeth. It is a developmental anomaly and has been argued to arise from multiple aetiologies. The most common site is the maxillary incisor region; but the prevalence of more than three teeth supernumerary tooth is less than 1%. A case of 13 year male patient is reported with a multiple impacted supernumerary tooth in maxillary anterior region hindering the eruption of right permanent central incisor. The supernumerary tooth was treated via surgical approach followed by an interim prosthesis for permanent central incisor which later on erupted in due course of time. Background Supernumerary teeth may be defined as any teeth or tooth substance in excess of the usual configuration of 20 deciduous and 32 permanent teeth. The presence of supernumerary teeth in the premaxillary region often poses unique diagnostic and managerial concerns for the practitioner. Rarely is the surplus number compensated by an absence or deficiency of other teeth. Therefore, the dysfunctional nature of supernumerary teeth and their ability to create a variety of pathological disturbances in the normal eruption and position of adjacent teeth warrants their early detection and prudent management. Approximately 76-86% of cases represent single-tooth hyperdontia, with two supernumerary teeth noted in 12-23% and three or more extra teeth noted in less than 1% of cases. Multiple supernumerary teeth are also associated with many syndromes like cleidocranial dysplasia and Gardner’s syndrome etc. However, it is rare to find multiple supernumeraries in individuals with no other associated disease or syndrome. In such cases, the maxillary anterior region is the common site of occurrence. The exact aetiology is not clearly understood. The supernumerary teeth result from any disturbance in the initiation and proliferation stages of odontogenesis. There are several theories regarding the

  1. Prevalence and characteristics of supernumerary teeth: A survey on 7348 people.

    Science.gov (United States)

    Demiriz, Levent; Durmuşlar, Mustafa Cenk; Mısır, Ahmet Ferhat

    2015-05-01

    The aim of the present study was to determine the prevalence of supernumerary teeth with by evaluating a large group of adult patients in Turkey and to investigate the characteristics of supernumerary teeth with their complications and treatment options. This descriptive and retrospective study was carried out in 7348 adult patients aged over 18 years (3212 females and 4136 males). The characteristics of the supernumerary teeth were noted and the diagnosis was made during clinical and radiographic examination with the help of panaromic, periapical, and occlusal radiography. Information on the demographic variables for each patient, including age and gender, were colleceted. All supernumerary teeth were classfied under several titles such as location, position, morphology, eruption, clinical complications, and treatment protocols. The data obtained were subjected to statistical analysis. Chi-squared test was used to determine differences in distribution of supernumerary teeth when stratified by gender. The statistical significance was established by confidence interval of 95% (P ≤ 0.05). 123 (2.14%) affected patients (69 females and 54 males) were observed with a female:male ratio of 1.28:1 (P supernumerary teeth were detected in all affected patients. Supernumerary teeth may be observed in adults patients with a similar frequency (2.14%) as in children and young adolescents, and clinicians should take measures and examine all patients carefully even at older ages.

  2. Piezoelectric ultrasonic bone surgery system in the extraction surgery of supernumerary teeth.

    Science.gov (United States)

    Gao, Yongbo; Lin, Zhenyan; Rodella, Luigi Fabrizio; Buffoli, Barbara; Wu, Xifeng; Zhou, Yanmin

    2014-12-01

    The anterior maxillary region is a common site for supernumerary teeth. The aim of this study was to compare the use of piezoelectric ultrasonic bone surgery for the extraction of supernumerary teeth and the use of traditional method using bone chisels. 60 patients with supernumerary anterior maxillary teeth were considered in this study. They were randomly divided into two groups: 1) the control group, in which the supernumerary teeth were extracted using the traditional bone chisels method; 2) the experimental group, in which the supernumerary teeth were extracted using a piezoelectric ultrasonic bone surgery system. The operative time, amount of bleeding and post-operative pain were quantified and compared; in addition, the post-operative swelling was evaluated. We observed a significant decrease (P supernumerary teeth was longer using the piezoelectric ultrasonic bone surgery system, the amount of bleeding and the post-operative complications were less, so this system could be considered an appropriate surgical method for the extraction of supernumerary teeth. Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved.

  3. Diagnostic tools used to predict the prevalence of supernumerary teeth: a meta-analysis.

    Science.gov (United States)

    Anthonappa, R P; King, N M; Rabie, A B M

    2012-09-01

    This study sought to (i) determine the variations in prevalence figures based on the diagnostic tools employed, and (ii) provide an insight into the prevalence of supernumerary teeth. A comprehensive literature search of the prevalence reports on supernumerary teeth was conducted using two databases. Two independent observers rated these articles according to exclusion and inclusion criteria. 28 papers were included in the analysis to determine the variations in the prevalence figures in relation to the method of diagnosis, and 14 studies were included to estimate the prevalence figures for supernumerary teeth. Statistical analysis was computed using analysis of variance (ANOVA), Student Neumann-Keuls (SNK) test and multiple regression analysis. Statistically significant differences were evident in the prevalence figures based only on a clinical examination compared with groups that also employed radiographs (p supernumerary teeth ranged from 0% to 3%. The mean prevalence value for the European white population [1.6% (±0.6)] was lower than that of the southern Chinese population [2.7% (±0.14)]. The overall prevalence of supernumerary teeth for males was significantly higher than for females [relative risk = 1.37 (1.13-1.50)]. Clinical examination plus some types of radiograph(s) are essential for determining the prevalence of supernumerary teeth; nevertheless, it is still underestimated. Several disparities in the prevalence reports make the available data on supernumerary teeth questionable.

  4. Identification of Highly Variable Supernumerary Chromosome Segments in an Asexual Pathogen.

    Directory of Open Access Journals (Sweden)

    Xiaoqiu Huang

    Full Text Available Supernumerary chromosome segments are known to harbor different transposons from their essential counterparts. The aim of this study was to investigate the role of transposons in the origin and evolution of supernumerary segments in the asexual fungal pathogen Fusarium virguliforme. We compared the genomes of 11 isolates comprising six Fusarium species that cause soybean sudden death syndrome (SDS or bean root rot (BRR, and identified significant levels of genetic variation in A+T-rich repeat blocks of the essential chromosomes and in A+T-neutral regions of the supernumerary segments. The A+T-rich repeat blocks in the essential chromosomes were highly variable between F. virguliforme and non-F. virguliforme isolates, but were scarcely variable between F. virguliforme isolates. The A+T-neutral regions in the supernumerary segments, however, were highly variable between F. virguliforme isolates, with a statistically significant number (21 standard deviations above the mean of single nucleotide polymorphisms (SNPs. And supernumerary sequence types and rearrangement patterns of some F. virguliforme isolates were present in an isolate of F. cuneirostrum but not in the other F. virguliforme isolates. The most variable and highly expressed region in the supernumerary segments contained an active DNA transposon that was a most conserved match between F. virguliforme and the unrelated fungus Tolypocladium inflatum. This transposon was absent from two of the F. virguliforme isolates. Furthermore, transposons in the supernumerary segments of some F. virguliforme isolates were present in non-F. virguliforme isolates, but were absent from the other F. virguliforme isolates. Two supernumerary P450 enzymes were 43% and 57% identical to their essential counterparts. This study has raised the possibility that transposons generate genetic variation in supernumerary chromosome segments by frequent horizontal transfer within and between closely related species.

  5. Neptune's rings

    Science.gov (United States)

    1999-01-01

    This 591-second exposure of the rings of Neptune were taken with the clear filter by the Voyager 2 wide-angle camera. The two main rings are clearly visible and appear complete over the region imaged. Also visible in this image is the inner faint ring and the faint band which extends smoothly from the ring roughly halfway between the two bright rings. Both of these newly discovered rings are broad and much fainter than the two narrow rings. The bright glare is due to over-exposure of the crescent on Neptune. Numerous bright stars are evident in the background. Both bright rings have material throughout their entire orbit, and are therefore continuous. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.

  6. Twelve Impacted Supernumerary Teeth in a Nonsyndromic Patient: A Rare Case Report.

    Science.gov (United States)

    Al-Iryani, Ghassan M; Ali, Fareedi Mukram

    2017-04-01

    Teeth in excess number than the normal count are called supernumerary teeth. They can be either unilateral or bilateral and single or multiple, found at any place in the dental arch, but most commonly found in the anterior maxillary region. Supernumerary teeth are commonly associated with syndromes when present in more numbers, but can be idiopathic. The present study shows a case report of a 16-year-old female patient who reported with overretained deciduous teeth. A panoramic radiograph showed multiple impacted supernumerary teeth. Based on clinical features and radiographic examination, a diagnosis of idiopathic hyperdontia was given. In such types of patients, management must be planned by a multidisciplinary approach.

  7. Multiple supernumerary teeth and odontoma in the maxilla: A case report

    Directory of Open Access Journals (Sweden)

    P B Sood

    2010-01-01

    Full Text Available Most supernumerary impacted teeth are located in the anterior maxillary region. They are classified according to their form and location. Their presence may give rise to a variety of clinical problems. The detection of supernumerary teeth is best achieved by thorough clinical and radiographic examination. Their management should form part of a comprehensive treatment plan. This article presents an overview of the diagnostic problems associated with multiple supernumerary impacted teeth and includes a discussion of the classification, diagnosis, and management of this difficult clinical entity.

  8. Multiple supernumerary teeth associated with an impacted maxillary central incisor: Surgical and orthodontic management

    Directory of Open Access Journals (Sweden)

    Ramakrishna Yeluri

    2012-01-01

    Full Text Available Various anomalies in the size, shape, number, structure and eruption of the teeth are often observed clinical conditions. Supernumerary teeth can be found in almost any region of the dental arch, and most of the times they are asymptomatic, and are routinely found during radiographic evaluation. The most common cause of impacted maxillary incisors is the presence of the supernumerary teeth. This paper describes a case of multiple supernumerary teeth associated with an impacted permanent maxillary central incisor in an 11-year old child along with its surgical and orthodontic management.

  9. Ring theory

    CERN Document Server

    Rowen, Louis H

    1991-01-01

    This is an abridged edition of the author's previous two-volume work, Ring Theory, which concentrates on essential material for a general ring theory course while ommitting much of the material intended for ring theory specialists. It has been praised by reviewers:**""As a textbook for graduate students, Ring Theory joins the best....The experts will find several attractive and pleasant features in Ring Theory. The most noteworthy is the inclusion, usually in supplements and appendices, of many useful constructions which are hard to locate outside of the original sources....The audience of non

  10. Morphologic characteristics, location, and associated complications of maxillary and mandibular supernumerary teeth as evaluated using cone beam computed tomography.

    Science.gov (United States)

    Mossaz, Jessica; Kloukos, Dimitrios; Pandis, Nikolaos; Suter, Valerie G A; Katsaros, Christos; Bornstein, Michael M

    2014-12-01

    To evaluate the location and morphologic characteristics of supernumerary teeth and to assess the frequency and extent of root resorption of adjacent teeth using cone beam computed tomography (CBCT). CBCT scans of 82 patients with supernumerary teeth in the maxilla and mandible were evaluated by two orthodontists independently. Data regarding the type, shape, and three-dimensional (3D) location of the supernumeraries including the frequency and extent of root resorption of adjacent teeth were recorded and evaluated for possible associations. The study comprised a total of 101 supernumerary teeth. Most of the patients (80.5 per cent) exhibited one single supernumerary tooth, while 15.8 per cent had two and 3.7 per cent had three supernumeraries. Males were affected more than females with a ratio of 1.65:1. Mesiodentes were the most frequently diagnosed type of supernumerary teeth (48.52 per cent), followed by supernumerary premolars (23.76 per cent) and lateral incisors (18.81 per cent). Supernumeraries were most commonly conical in shape (42.6 per cent) with a normal or inclined vertical position (61.4 per cent). Root resorption of adjacent teeth was detected for 22.8 per cent of the supernumerary teeth, most frequently for supernumerary premolars. There was a significant association between root resorption of adjacent teeth and type and shape of tooth. Interrater agreement for the measurements performed showed kappa values ranging from 0.55 to 1 with a kappa value of 1 for type and shape of the supernumerary teeth. CBCT provides 3D information about location and shape of supernumerary teeth as well as prevalence and degree of root resorption of neighbouring teeth with moderate to high interrater correlation. © The Author 2014. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oup.com.

  11. Identification of supernumerary teeth in 2D and 3D: review of literature and a proposal.

    Science.gov (United States)

    Toureno, Leo; Park, Jae Hyun; Cederberg, Robert A; Hwang, Eui Hwan; Shin, Je-Won

    2013-01-01

    Supernumerary teeth occur in both syndromic and nonsyndromic patients, and dental professionals are likely to encounter such teeth in their professional careers. There are three main numbering systems used to identify teeth today: the Universal/ National, the Palmer/Zsigmondy notation, and the Federation Dentaire Internationale (FDI) numbering systems. However, a review of the literature suggests that none of these three consistently addresses the identification of supernumerary teeth. Being able to communicate the location of supernumerary teeth is important for dental professionals, especially in interdisciplinary situations. This article proposes a guideline to locate and identify supernumerary teeth in two and three dimensions, which may reduce treatment errors and improve communication among health care providers and third-party administrators.

  12. Tooth size in patients with supernumerary teeth and a control group measured by image analysis system.

    Science.gov (United States)

    Khalaf, K; Robinson, D L; Elcock, C; Smith, R N; Brook, A H

    2005-02-01

    The aim of this study was to compare tooth size measurements between patients with supernumerary teeth and a control group. The supernumerary group consisted of 56 subjects (21 females and 35 males) and the control group of 40 subjects (20 females and 20 males). All available permanent teeth on the dental casts were imaged and measured from both buccal and occlusal views using an image analysis system. Mesio-distal, bucco-lingual or occluso-gingival dimensions, area and perimeter were measured from each view. Supernumerary tooth patients tended to have larger tooth size measurements for almost all variables than controls. Significant differences (psupernumerary teeth being a complex dental anomaly with a multifactorial aetiology in which both genetic and environmental factors are important. There is some evidence of a local effect with greater differences in tooth dimension adjacent to the site of the supernumeraries.

  13. Non-syndromic multiple supplemental supernumerary teeth in permanent dentition: a case report

    National Research Council Canada - National Science Library

    Mahdi Zakeri; Mahdieh Chavoshzadeh; Mina Zareian Jahromi

    2014-01-01

    ...: We documented a case of non-syndromic multiple supplemental supernumerary teeth in the three quadrants and premaxillary region of permanent dentition of an adult male patient, an incidental findings...

  14. Supernumerary teeth and mental retardation: the importance of early surgical intervention.

    Science.gov (United States)

    Cozza, P; Mucedero, M; Ballanti, F; De Toffol, L

    2006-03-01

    This paper reported a rare case of hyperdontia in a child of 10 years who revealed a mixed dentition and a light mental retardation. The therapeutic approach has been based on interdisciplinary cooperation between the pediatric dentist, orthodontist and oral surgeon. TC-Dentascan, with a panoramic and occlusal radiographs revealed the presence of two supernumerary teeth in the premaxillary region and clinical examination showed an abnormality of dentoalveolar complex. Both impacted supernumerary teeth were extracted under general anesthesia. Clinical examination revealed that they appeared two premolars in shape with fully formed crowns and partly formed roots. Three months after the extraction of supernumerary teeth there was a spontaneous eruption of permanent central incisors and left lateral incisor. The authors emphasized the importance of removal of supernumerary teeth to eliminate the cause of a delayed eruption of permanent teeth.

  15. Supernumerary spacing of rainbows produced by an elliptical-cross-section cylinder. I. Theory.

    Science.gov (United States)

    Lock, J A

    2000-09-20

    A sequence of rainbows is produced in light scattering by a particle of high symmetry in the short-wavelength limit, and a supernumerary interference pattern occurs to one side of each rainbow. Using both a ray-tracing procedure and the Debye-series decomposition of first-order perturbation wave theory, I examine the spacing of the supernumerary maxima and minima as a function of the cylinder rotation angle when an elliptical-cross-section cylinder is normally illuminated by a plane wave. I find that the supernumerary spacing depends sensitively on the cylinder-cross-section shape, and the spacing varies sinusoidally as a function of the cylinder rotation angle for small cylinder ellipticity. I also find that relatively large uncertainties in the supernumerary spacing affect the rainbow angle only minimally.

  16. Prevalence of supernumerary teeth in a nonsyndromic Syrian sample.

    Science.gov (United States)

    Burhan, Ahmad S; Nawaya, Fehmieh R; Arabi Katbi, Mohammad E; Al-Jawabra, Alaa S

    2015-12-01

    Supernumerary teeth (ST), also known as hyperdontia, is a condition in which more than the normal number of teeth are present in the series. The prevalence of ST varies between and within different populations. These teeth may cause various complications. The aim of the current study was to investigate the prevalence and characteristics of ST in Damascus inhabitants, Syria. A cross-sectional study was carried out using retrospectively collected digital panoramic radiographs of 2753 patients (1047 males and 1706 females) ranging in age from 12.2 to 20.5 years between January 2012 and December 2014. These radiographs were obtained from private dental offices spread across Damascus, Syria. For each patient with ST, the demographic variables, number, location, type, position, morphology of ST, and complications were recorded. ST were detected in 39 patients (1.4%), of whom 25 (64.1%) were males and 14 (35.9%) were females, with a male to female ratio of 1.8 : 1 (Psupernumerary premolars (28.3%), supernumerary laterals (26.1%), distomolars (4.3%), and paramolars (2.2%). This series includes cases with one and two ST. Of the 46 ST detected, 56.5% had a conical morphology, 89.1% were in a vertical position, and 19.6% were erupted. ST caused displacement of the adjacent teeth in 17 cases (37.0%) and the impaction of the permanent teeth in five cases (10.9%). The prevalence of ST in Damascus inhabitants was found to be 1.4%; the most frequent type was mesiodens. A conical morphology was found to be the most common form of ST. Displacement of permanent teeth is the most frequent complication. Further studies should be carried out on more representative samples of both the public and the private sector patients.

  17. Diagnosis and management of supernumerary (mesiodens): a review of the literature.

    Science.gov (United States)

    Meighani, G; Pakdaman, A

    2010-01-01

    Supernumerary tooth is one of the developmental problems in children. Mesiodens is a supernumerary tooth present in the midline between the two central incisors. It usually results in oral problems such as malocclusion, food impaction, poor aesthetics, and cyst formation. The prevalence of mesiodens varies between 0.09% and 2.05% in different studies. This paper reviews current literature on etiology, prevalence, diagnosis, and management of this problem. Accordingly, early diagnosis and treatment is suggested to prevent orthodontic and pathologic complications.

  18. Delayed eruption of maxillary permanent central incisors due to bilateral tuberculate supernumerary teeth: case report.

    Science.gov (United States)

    Manuja, Naveen; Nagpal, Rajni; Singh, Mousumi; Chaudhary, Seema; Suresh, B S

    2010-01-01

    The purpose of this case report is to discuss the delayed eruption of permanent maxillary central incisors in a 10-year-old boy with retained primary maxillary central incisors. Radiological investigations revealed the presence of impacted bilateral supernumerary teeth and impacted permanent incisors. These supernumerary teeth were surgically removed and were diagnosed as tuberculate type. The patient is on clinical and radiological follow up for spontaneous eruption of the permanent teeth.

  19. Late development of supernumerary teeth in the premolar region: a case report.

    Science.gov (United States)

    Hegde, S V; Munshi, A K

    1996-07-01

    Supernumerary teeth are considered to be among the most significant dental anomalies affecting the primary and the early mixed dentitions. Early removal of such teeth is recommended if they impede the eruption of adjacent permanent teeth, appear inverted or rudimentary, or are associated with certain pathologic conditions. This report describes the appearance of late-developing supernumerary teeth in the premolar region in three quadrants.

  20. Prevalence rate of supernumerary teeth among non-syndromic South Indian population: An analysis

    OpenAIRE

    M Nazargi Mahabob; Anbuselvan, G. J.; B Senthil Kumar; Raja, S.; Sucitha Kothari

    2012-01-01

    Aim: Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stage. The main objective of the study was to determine the prevalence rate of supernumerary teeth in the patients who reported to the Department of Oral Medicine and Radiology and to study the associated clinical complications. Materials and Methods: A longitudinal observational study was conducted of 2216 patients for a period of 4 months with the documentatio...

  1. A case report : Supernumerary roots of deciduous molar associated with missing permanent premolars

    OpenAIRE

    藤井,博志/畑,良明/今北,将人/森清,裕士/伊藤,修一; フジイ,ヒロシ/ハタ,ヨシアキ/イマキタ,マサト/モリキヨ,ヒロシ/イトウ,シュウイチ; FUJII,Hiroshi/HATA,Yoshiaki/IMAKITA,Masato/MORIKIYO,Hiroshi/ITO,Shuichi

    2002-01-01

    Malformations of deciduous teeth occur is very rare, because of their primitive forms. The abnormality of the roots of deciduous teeth as well as of crowns is rare. This case report is the supernumerary roots of deciduous molar with congenitally missing teeth in a 12-year 10-month old male. The findings are as follows : 1)In the upper right second primary molar, the supernumerary root was formed beneath a protoconule which developed without complications. 2) The lingual cusps of the upper bil...

  2. An unusual presentation of generalized aggressive periodontitis with multiple impacted supernumerary teeth

    OpenAIRE

    Salman, Arif; Meethil, Archana

    2012-01-01

    Aggressive periodontitis is a rare condition that progresses rapidly but affects only a small percentage of population. Most of the cases are familial. The presence of supernumerary teeth is also rather rare and often familial. Therefore, a concomitant presentation of aggressive periodontitis and supernumerary teeth in an individual has generated a great interest among clinicians. Here, we report a rare nonsyndromic case of generalized aggressive periodontitis with multiple impacted supernume...

  3. Coexistent partial anodontia and supernumerary tooth in the mandibular arch: A rare case

    Directory of Open Access Journals (Sweden)

    Das G

    2006-05-01

    Full Text Available Coexistent partial anodontia and supernumerary tooth in the lower jaw is a very uncommon condition. Very few cases have been reported in the literature of this condition, etiology of which is still obscure. Presented here is a rare case of simultaneous presence of single supernumerary tooth together with missing permanent central incisor teeth in the lower jaw without any associated systemic condition or syndrome.

  4. A small supernumerary marker chromosome X identified by in situ hybridization.

    Science.gov (United States)

    Silahtaroglu, A N; Hacihanefioglu, S; Yilmaz, S; Tarkan, Y; Cenani, A; Tümer, Z

    1995-05-01

    Cytogenetic analysis of a girl with moderate mental retardation and dysmorphic features revealed a 46,XX/47,XX,+mar karyotype. Fluorescence in situ hybridization using chromosome specific alpha satellite probes showed that the supernumerary marker originated from the X chromosome. To our knowledge, this is the first reported case of a female patient mosaic for a supernumerary small marker chromosome derived from X, and hence mosaic for trisomy of the pericentric region of the X chromosome.

  5. Agenesis of premolar associated with submerged primary molar and a supernumerary premolar: An unusual case report

    Directory of Open Access Journals (Sweden)

    S. V. S. G. Nirmala

    2012-01-01

    Full Text Available The combination of submerged primary molar, agenesis of permanent successor with a supernumerary in the same place is very rare. The purpose of this article is to report a case of submerged mandibular left second primary molar with supernumerary tooth in the same region along with agenesis of second premolar in an 11-year-old girl, its possible etiological factors, and a brief discussion on treatment options.

  6. Prevalence rate of supernumerary teeth among non-syndromic South Indian population: An analysis

    Directory of Open Access Journals (Sweden)

    M Nazargi Mahabob

    2012-01-01

    Full Text Available Aim: Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stage. The main objective of the study was to determine the prevalence rate of supernumerary teeth in the patients who reported to the Department of Oral Medicine and Radiology and to study the associated clinical complications. Materials and Methods: A longitudinal observational study was conducted of 2216 patients for a period of 4 months with the documentation of demographic data, the presence of supernumerary teeth, their location, and associated complications such as mechanical trauma, dental caries, and associated pathology. Results: The study recorded 27 supernumerary teeth from the examined 2216 patients. This yields a prevalence of 1.2%, with greater frequency in males which was 1.49% and in females the frequency was 0.85%. The greatest proportion of supernumerary teeth was found in the maxillary anterior region (77.8%. Out of this, 85.7% were classified as mesiodens based on their location. The displacement of adjacent teeth was the most common finding, followed by dental caries. Conclusion: The prevalence of supernumerary teeth in this study was 1.2% which is in agreement with that reported in similar studies and the maxillary mesiodens was the most common location. Displacement of adjacent teeth was the most common finding.

  7. Lateral incisor agenesis, canine impaction and characteristics of supernumerary teeth in a South European male population.

    Science.gov (United States)

    Delli, Konstantina; Livas, Christos; Bornstein, Michael M

    2013-07-01

    To assess the prevalence of lateral incisor agenesis impacted canines and supernumerary teeth in a young adult male population. The panoramic radiographs of 1745 military students (mean age: 18.6 ± 0.52 years) who attended the Center of Aviation Medicine of the Armed Forces of Greece during the period 1997-2011 were initially analyzed for lateral incisor agenesis by two observers. After exclusion of the known orthodontic cases, a subgroup of 1636 examinees (mean age: 18.6 ± 0.44 years) was evaluated for canine impaction and supernumerary teeth. Twenty-eight missing lateral incisors were observed in 22 military students, indicating an incidence of 1.3% in the investigated population. No lateral incisor agenesis was detected in the mandibular arch. A prevalence rate of 0.8% was determined for canine impaction in the sample of young adults. The majority of impacted teeth (86.7%) were diagnosed in the maxillary arch. Thirty-five supernumerary teeth were observed in 24 examinees (prevalence rate: 1.5%). The ratio of supernumerary teeth located in the maxilla versus the mandible was 2.2:1. The most common type of supernumerary tooth was the upper distomolar. The prevalence of lateral incisor agenesis, canine impaction, and supernumerary teeth ranged from 0.8 to 1.5% in the sample of male Greek military students.

  8. Histological Evaluation and Management of Rare Case of Supernumerary "Ghost" Teeth.

    Science.gov (United States)

    Re, Dino; Canciani, Elena; Poli, Corinne; Buccarella, Laura; Toma, Marilisa; Butti, Andrea Carlo; Dellavia, Claudia

    2017-01-01

    Supernumerary teeth are teeth that exceed the normal dental formula. Their prevalence in the permanent dentition is 1-14% and they occur more frequently in maxilla with a sex ratio of 2 : 1 in favor of males. They are often associated with syndromes but there are examples of nonsyndromic multiple supernumerary teeth reported in the literature. CBCT is usually the best exam for radiographic diagnosis and treatment planning, because it provides 3D information about location and morphology of supernumerary teeth. This paper reports a rare case of four supernumerary teeth in a nonsyndromic 9-year-old boy. The peculiarity of this case is that two more exceeding teeth were found during surgical procedure. After extraction, all the teeth underwent a histological undecalcified processing for light microscopical examination. The two "ghost" supernumerary teeth seemed to be primordial dental germs, possibly resulting from an altered odontogenic process. After supernumerary teeth extraction, X-rays and exfoliation monitoring are recommended, since permanent retained teeth often erupt naturally or, at least, improve their condition. Radiographic follow-up is also useful in order to assess the formation of further teeth due to the hyperactivity of the dental lamina.

  9. Histological Evaluation and Management of Rare Case of Supernumerary “Ghost” Teeth

    Directory of Open Access Journals (Sweden)

    Dino Re

    2017-01-01

    Full Text Available Supernumerary teeth are teeth that exceed the normal dental formula. Their prevalence in the permanent dentition is 1–14% and they occur more frequently in maxilla with a sex ratio of 2 : 1 in favor of males. They are often associated with syndromes but there are examples of nonsyndromic multiple supernumerary teeth reported in the literature. CBCT is usually the best exam for radiographic diagnosis and treatment planning, because it provides 3D information about location and morphology of supernumerary teeth. This paper reports a rare case of four supernumerary teeth in a nonsyndromic 9-year-old boy. The peculiarity of this case is that two more exceeding teeth were found during surgical procedure. After extraction, all the teeth underwent a histological undecalcified processing for light microscopical examination. The two “ghost” supernumerary teeth seemed to be primordial dental germs, possibly resulting from an altered odontogenic process. After supernumerary teeth extraction, X-rays and exfoliation monitoring are recommended, since permanent retained teeth often erupt naturally or, at least, improve their condition. Radiographic follow-up is also useful in order to assess the formation of further teeth due to the hyperactivity of the dental lamina.

  10. Prevalence rate of supernumerary teeth among non-syndromic South Indian population: An analysis.

    Science.gov (United States)

    Mahabob, M Nazargi; Anbuselvan, G J; Kumar, B Senthil; Raja, S; Kothari, Sucitha

    2012-08-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stage. The main objective of the study was to determine the prevalence rate of supernumerary teeth in the patients who reported to the Department of Oral Medicine and Radiology and to study the associated clinical complications. A longitudinal observational study was conducted of 2216 patients for a period of 4 months with the documentation of demographic data, the presence of supernumerary teeth, their location, and associated complications such as mechanical trauma, dental caries, and associated pathology. The study recorded 27 supernumerary teeth from the examined 2216 patients. This yields a prevalence of 1.2%, with greater frequency in males which was 1.49% and in females the frequency was 0.85%. The greatest proportion of supernumerary teeth was found in the maxillary anterior region (77.8%). Out of this, 85.7% were classified as mesiodens based on their location. The displacement of adjacent teeth was the most common finding, followed by dental caries. The prevalence of supernumerary teeth in this study was 1.2% which is in agreement with that reported in similar studies and the maxillary mesiodens was the most common location. Displacement of adjacent teeth was the most common finding.

  11. Management and outcome following extraction of 303 supernumerary teeth in pediatric patients.

    Science.gov (United States)

    Mínguez-Martinez, Ignacio; Ata-Ali, Javier; Bonet-Coloma, Cristina; Peñarrocha-Oltra, David; Peñarrocha-Diago, Maria A; Minguez-Sanz, Juan M

    2012-01-01

    The purpose of this study was to describe the treatment of permanent teeth impacted by supernumerary teeth and their outcome following extraction. The study population comprised 200 2- to 14-year-olds. A total of 303 supernumerary teeth were removed from the 200 patients. Surgery was performed on: 129 teeth (~43%) from the vestibular and palatine/lingual (mixed) side; 110 teeth (~36%) from the palatine/lingual side; and 64 teeth (~21%) from the vestibular side. Regarding the shape of the supernumerary teeth, the distribution was: 118 conoid teeth; 92 supplementary teeth; 66 tuberculate teeth; and 27 teeth of varied shapes. In approximately 61% of the permanent teeth (159 teeth), the supernumerary teeth caused impaction of the former, while no case of impaction was recorded in the case of the primary dentition. The impacted permanent teeth evolved favorably in 100% of the orthodontic tractions, in 80% of the relocations, and in approximately 65% of the conductive alveolectomies. The highest percentage success rate in treating permanent teeth impacted by supernumerary teeth corresponded to those cases in which surgery could be combined with orthodontic treatment. There were no displacements of neighboring buds during removal of the supernumerary teeth in the primary dentition.

  12. Histological Evaluation and Management of Rare Case of Supernumerary “Ghost” Teeth

    Science.gov (United States)

    Canciani, Elena; Buccarella, Laura; Toma, Marilisa; Butti, Andrea Carlo; Dellavia, Claudia

    2017-01-01

    Supernumerary teeth are teeth that exceed the normal dental formula. Their prevalence in the permanent dentition is 1–14% and they occur more frequently in maxilla with a sex ratio of 2 : 1 in favor of males. They are often associated with syndromes but there are examples of nonsyndromic multiple supernumerary teeth reported in the literature. CBCT is usually the best exam for radiographic diagnosis and treatment planning, because it provides 3D information about location and morphology of supernumerary teeth. This paper reports a rare case of four supernumerary teeth in a nonsyndromic 9-year-old boy. The peculiarity of this case is that two more exceeding teeth were found during surgical procedure. After extraction, all the teeth underwent a histological undecalcified processing for light microscopical examination. The two “ghost” supernumerary teeth seemed to be primordial dental germs, possibly resulting from an altered odontogenic process. After supernumerary teeth extraction, X-rays and exfoliation monitoring are recommended, since permanent retained teeth often erupt naturally or, at least, improve their condition. Radiographic follow-up is also useful in order to assess the formation of further teeth due to the hyperactivity of the dental lamina. PMID:28546879

  13. [Supernumerary teeth in the maxilla and mandible-an interdisciplinary challenge. Part 1: epidemiology, etiology, classification and associated complications].

    Science.gov (United States)

    Mossaz, Jessica; Suter, Valerie G A; Katsaros, Christos; Bornstein, Michael M

    2016-01-01

    Supernumerary teeth develop in addition to the normal dentition and are a therapeutic challenge for pedodontists, orthodontists and oral surgeons alike. Therefore, interdisciplinary treatment concepts are needed for the benefit of the patient. In the present, two-parted literature review on supernumerary teeth, current classification, associated complications, diagnostic steps and different therapeutic approches are presented and discussed. Supernumerary teeth are diagnosed in the primary and permanent dentition. Supernumerary incisors, canines, premolars, and molars, as well as distomolars and mesiodentes can be seen according to the location of the supernumerary teeth. Furthermore, based on the morphology of the supernumeraries four different types can be differentiated: conical, tuberculate, supplemental, and odontoma. Supernumerary teeth often remain asymptomatic, and are only diagnosed incidentally during a routine dental visit on radiographs (often intraoral). Nevertheless, various complications have been reported in the literature for supernumerary teeth such as disturbed eruption, malpositioning/rotation, root resorption of neighbouring teeth, and development of dentigerous cysts in impacted supernumeraries. Root resorption of neighbouring teeth can be radiographically diagnosed in up to 22.8% of the cases.

  14. INVESTIGATION OF IMPACTED SUPERNUMERARY TEETH: A CONE BEAM COMPUTED TOMOGRAPH (CBCT STUDY

    Directory of Open Access Journals (Sweden)

    Gökhan GÜRLER

    2017-10-01

    Full Text Available Purpose: The purpose of this study was to investigate the impacted supernumerary teeth which were initially detected on panoramic radiographs by using cone beam computed tomography (CBCT. Materials and Methods: In this retrospective study, supernumerary teeth diagnosed on panoramic radiographs taken from patients who had admitted for routine dental treatment were evaluated using CBCT. Patients’ age, gender, systemic conditions as well as number of supernumerary teeth, unilateral-bilateral presence, anatomical localization (maxilla, mandible, anterior-premolar-molar, mesiodens-lateral-canine, parapremolar-paramolar-distomolar shape (rudimentary, supplemental, tuberculate, odontoma, position (palatal-lingual-buccal-labial-central, shortest distance between the tooth and adjacent cortical plate, complications and treatment were assessed. Results: A total of 47 impacted supernumerary teeth in 34 patients were investigated in this study. Of these, 33 (70.2% were unilateral and 14 (29.8% were bilateral. Only 1 supernumerary tooth was found in 27 patients (79.4% whereas 7 patients (20.6% had 2 or more supernumerary teeth. Most of the teeth located in the anterior region (74.4% of the jaws and maxilla (74.4%. Twenty teeth (42.5% were mesiodens, 11 (23.4% were lateral or canine, 14 (29.7% were parapremolar and 2(4.4% were distomolar. Twenty-seven teeth (57.4% were rudimentary, 15 (31.9% were supplemental and 5 (10.7% were odontoma in shape. The shortest distance between the supernumerary tooth and adjacent cortical plate varied between 0 to 2.5 mm with a mean of 0.66 mm. The most common clinical complaint was the non-eruption of permanent teeth (42.5%. All supernumerary teeth were removed under local anesthesia. Orthodontic traction was performed for those impacted permanent teeth if necessary. Conclusion: Impacted supernumerary teeth are usually in close proximity to cortical bone. Although this may facilitate surgical access, there is a risk of

  15. Mesiodens--diagnosis and management of a common supernumerary tooth.

    Science.gov (United States)

    Russell, Kathleen A; Folwarczna, Magdalena A

    2003-06-01

    Mesiodentes are the most common supernumerary teeth, occurring in 0.15% to 1.9% of the population. Given this high frequency, the general dentist should be knowledgeable about the signs and symptoms of mesiodentes and appropriate treatment. The cause of mesiodentes is not fully understood, although proliferation of the dental lamina and genetic factors have been implicated. Mesiodentes can cause delayed or ectopic eruption of the permanent incisors, which can further alter occlusion and appearance. It is therefore important for the clinician to diagnose a mesiodens early in development to allow for optimal yet minimal treatment. Treatment options may include surgical extraction of the mesiodens. If the permanent teeth do not erupt in a reasonable period after the extraction, surgical exposure and orthodontic treatment may be required to ensure eruption and proper alignment of the teeth. In some instances, fixed orthodontic therapy is also required to create sufficient arch space before eruption and alignment of the incisor(s). Early diagnosis allows the most appropriate treatment, often reducing the extent of surgery, orthodontic treatment and possible complications. This paper outlines the causes and modes of presentation of mesiodentes, and presents guidelines for diagnosis and management of nonsyndromic mesiodentes.

  16. Multiple forms of atypical rearrangements generating supernumerary derivative chromosome 15

    Directory of Open Access Journals (Sweden)

    Sigman Marian

    2008-01-01

    Full Text Available Abstract Background Maternally-derived duplications that include the imprinted region on the proximal long arm of chromosome 15 underlie a complex neurobehavioral disorder characterized by cognitive impairment, seizures and a substantial risk for autism spectrum disorders1. The duplications most often take the form of a supernumerary pseudodicentric derivative chromosome 15 [der(15] that has been called inverted duplication 15 or isodicentric 15 [idic(15], although interstitial rearrangements also occur. Similar to the deletions found in most cases of Angelman and Prader Willi syndrome, the duplications appear to be mediated by unequal homologous recombination involving low copy repeats (LCR that are found clustered in the region. Five recurrent breakpoints have been described in most cases of segmental aneuploidy of chromosome 15q11-q13 and previous studies have shown that most idic(15 chromosomes arise through BP3:BP3 or BP4:BP5 recombination events. Results Here we describe four duplication chromosomes that show evidence of atypical recombination events that involve regions outside the common breakpoints. Additionally, in one patient with a mosaic complex der(15, we examined homologous pairing of chromosome 15q11-q13 alleles by FISH in a region of frontal cortex, which identified mosaicism in this tissue and also demonstrated pairing of the signals from the der(15 and the normal homologues. Conclusion Involvement of atypical BP in the generation of idic(15 chromosomes can lead to considerable structural heterogeneity.

  17. Vascular ring

    DEFF Research Database (Denmark)

    Schmidt, Anne Mette S; Larsen, Signe H; Hjortdal, Vibeke E

    2018-01-01

    BACKGROUND: Vascular ring is a rare cause of recurrent respiratory infections, dysphagia and stridor. Surgical repair is considered safe but the long-term outcomes are unclear. The purpose of this study was to investigate the mortality and morbidity following vascular ring surgery in a single...... age of 1.4 years (range 0.008-64 years) were operated for vascular ring. Median follow-up was 6.8 years (range 2.4-34 years). Presenting symptoms were stridor (52%), dysphagia or vomiting (52%) and recurrent respiratory infections (48%). There were no early or late deaths. Three months postoperatively...

  18. The beam has circulated 30 minutes in the LHC!

    CERN Multimedia

    Last night around 2 a.m. the beam circulated for the first time for about 30 minutes in the clockwise ring of the LHC. This confirms that the accelerating cavities are working well. During the night, the LHC team also increased the intensity of the single bunch to around 1/20th of the nominal LHC bunch intensity. You can follow the beam commissioning daily reports on: https://lhc-commissioning.web.cern.ch/lhc-commissioning/dailynews/index.htm

  19. Mirror imaging of impacted and supernumerary teeth in dizygotic twins: A case report.

    Science.gov (United States)

    Cassetta, Michele; Altieri, Federica; Giordano, Alessandra

    2015-02-01

    Mesiodens is the most common type of supernumerary tooth found in the premaxilla. It might be discovered by the clinical examination by chance on a radiograph or as the cause of an unerupted maxillary central incisor. The genetic transmission of supernumerary and impacted teeth is poorly understood. Mirror imaging in twins has been reported frequently in relation to several unilateral dental anomalies including mesiodens. This phenomenon is the appearance of an asymmetrical feature or anomaly occurring on the right side of one twin but on the left side of the other twin. The event of mesiodens mirror imaging in monozygotic twins has been described in literature. This is the first reported case of mesiodens mirror images in dizygotic twins. The de-scribed mesiodens caused the eruption failure of maxillary permanent incisors. The super-numerary teeth were removed to facilitate the spontaneous eruption of the impacted perma-nent maxillary incisors. Studies related to supernumerary teeth can be useful to clinicians in the early diagnosis of this anomaly. Clinical and radiographic examinations provide a correct therapeutic approach. Key words:Supernumerary teeth, twins, dental development.

  20. PAX6 polymorphisms in 20 Chinese children with supernumerary teeth in the maxillary incisor area.

    Science.gov (United States)

    Lei, Hai-Hua; Liu, He; Ge, Li-Hong

    2011-07-01

    To search for variants of PAX6 gene in patients with nonsyndromic supernumerary teeth in the maxillary incisor area (NSST) and compare genotypes and allele frequencies of the detected polymorphisms between the patients and controls. Twenty children with NSST and 31 controls were included. Genomic DNA was extracted from buccal epithelial cells of each individual. Sequencing analysis of all exons and exon/intron boundaries of PAX6 gene were performed in patients. Genotypes and allele frequencies of the single nucleotide polymorphisms detected in patients were compared between the two groups using chi-square tests. Of the 20 patients examined, six showed heterozygous for rs667773 and rs3026393 simultaneously. Among them, four possessed two supernumerary teeth and the other two possessed one. Another six patients showed heterozygous for rs3026393, five of which possessed only one supernumerary tooth and the other one possessed two. Of another six patients with homozygous rs3026393, three possessed one supernumerary tooth and the other three possessed two. The distributions of genotypes and alleles frequencies of single nucleotide polymorphisms rs667773 and rs3026393 showed no significant difference between the two groups. The present study did not find evidence of PAX6 polymorphisms being associated with supernumerary teeth in the population studied. © 2011 The Authors. International Journal of Paediatric Dentistry © 2011 BSPD, IAPD and Blackwell Publishing Ltd.

  1. Comprehensive therapy of a fusion between a mandibular lateral incisor and supernumerary tooth: case report.

    Science.gov (United States)

    Onçag, Ozant; Candan, Umit; Arikan, Fatih

    2005-08-01

    The term fusion is used to define a developmental anomaly characterised by the union of two adjacent teeth. In the case reported here, clinical and radiographic examinations suggested a unilateral fusion between the mandibular left permanent incisor and a super-numerary tooth. Radiographs showed that the fused teeth had two distinct pulp chambers and canals. A diagnosis of chronic periapical abscess of the supernumerary tooth was made. Before root canal therapy, a periodontal surgical procedure was performed to section the central incisor and its fused supernumerary. Also, odontoplasty was performed on the roots, to establish an anatomy consistent with a normal central incisor. Later, the chronic apical abscess on the supernumerary tooth was instrumented chemo-mechanically, root canal filling was performed and an anterior composite resin restoration was placed. The patient was evaluated for one year after root canal therapy. The tooth was asymptomatic, not exhibiting any pathological root resorption or alveolar resorption, and the anterior composite restoration was intact. Instead of extracting the supernumerary tooth, the application of endodontic, periodontal, and restorative procedures proved to be an alternative treatment.

  2. Determinantal rings

    CERN Document Server

    Bruns, Winfried

    1988-01-01

    Determinantal rings and varieties have been a central topic of commutative algebra and algebraic geometry. Their study has attracted many prominent researchers and has motivated the creation of theories which may now be considered part of general commutative ring theory. The book gives a first coherent treatment of the structure of determinantal rings. The main approach is via the theory of algebras with straightening law. This approach suggest (and is simplified by) the simultaneous treatment of the Schubert subvarieties of Grassmannian. Other methods have not been neglected, however. Principal radical systems are discussed in detail, and one section is devoted to each of invariant and representation theory. While the book is primarily a research monograph, it serves also as a reference source and the reader requires only the basics of commutative algebra together with some supplementary material found in the appendix. The text may be useful for seminars following a course in commutative ring theory since a ...

  3. Management of Delayed Eruption of Permanent Maxillary Incisor associated with the Presence of Supernumerary Teeth: A Case Report

    Science.gov (United States)

    Nagpal, Rajni; Singh, Mousumi; Chaudhary, Seema

    2011-01-01

    A supernumerary tooth is one that is additional to the normal series and can be found in almost any region of the dental arch. Clinically, supernumerary teeth are able to cause different local disorders. It is important for the dentist to be aware of the clinical complications of supernumerary teeth, the most common being the delayed eruption of permanent teeth. Early diagnosis and management of supernumerary teeth is important to prevent the need for more complex surgical and orthodontic treatment. This case report highlights the problem of delayed eruption of permanent maxillary left central incisor in a 9-year-old boy due to two supernumerary teeth, one tuberculate type and other impacted inverted mesiodens. PMID:27678238

  4. Management of Delayed Eruption of Permanent Maxillary Incisor associated with the Presence of Supernumerary Teeth: A Case Report.

    Science.gov (United States)

    Manuja, Naveen; Nagpal, Rajni; Singh, Mousumi; Chaudhary, Seema

    2011-01-01

    A supernumerary tooth is one that is additional to the normal series and can be found in almost any region of the dental arch. Clinically, supernumerary teeth are able to cause different local disorders. It is important for the dentist to be aware of the clinical complications of supernumerary teeth, the most common being the delayed eruption of permanent teeth. Early diagnosis and management of supernumerary teeth is important to prevent the need for more complex surgical and orthodontic treatment. This case report highlights the problem of delayed eruption of permanent maxillary left central incisor in a 9-year-old boy due to two supernumerary teeth, one tuberculate type and other impacted inverted mesiodens.

  5. [Supernumerary teeth in the maxilla and mandible-an interdisciplinary challenge. Part 2: diagnostic pathways and current therapeutic concepts].

    Science.gov (United States)

    Mossaz, Jessica; Suter, Valerie G A; Katsaros, Christos; Bornstein, Michael M

    2016-01-01

    Proper localization of supernumerary teeth is very important for the diagnosis, treatment planning, and prior to any surgical intervention. Traditionally, supernumerary teeth were diagnosed and located using two-dimensional (2D) radiographic methods such as panoramic views, cephalometric imaging, and also intraoral (also often occlusal) radiographs. With the introduction of cone beam computed tomography (CBCT) in dental medicine, this three-dimensional (3D) imaging technique is now more and more used for the exact localisation of supernumerary teeth and the diagnosis of root resorption of adjacent teeth. Treatment planning depends on various factors such as the time of diagnosis, the age of the patient, the position of the supernumerary tooth and possible complications. In the present second part of this review article on supernumerary teeth in the maxilla and mandible, the diagnostic workflow and current treatment concepts will be presented and critically discussed.

  6. Absence of lambda immunoglobulin sequences on the supernumerary chromosome of the "cat eye" syndrome.

    Science.gov (United States)

    Hough, C A; White, B N; Holden, J J

    1995-09-11

    The supernumerary bisatellited chromosome causing the "cat eye" syndrome (CES) is of chromosome 22 origin and consists of an inverted duplication of the 22pter-->22q11.2 region. To determine the extent of involvement of band q11.2 on the bisatellited chromosome, copy number assessment of sequences homologous to cloned lambda immunoglobulin (lambda Ig) gene region probes was carried out on DNA from individuals with CES using densitometric analysis of Southern blots. None of the 10 lambda Ig sequences studied was found in increased copy number in DNA from any of the 10 CES individuals tested, indicating that these sequences are not present on the supernumerary chromosome. The breakpoints involved in the generation of the bisatellited supernumerary chromosome associated with CES are therefore proximal to the lambda Ig gene region.

  7. Impacted incisors associated with supernumerary teeth treated with a modified Haas appliance.

    Science.gov (United States)

    Sant'Anna, Eduardo Franzotti; Marquezan, Mariana; Sant'Anna, Claudia Franzotti

    2012-12-01

    Tooth impaction involves factors such as lack of space in the alveolar process, trauma, ankylosis, and mechanical barriers such as abnormal frenum, supernumerary teeth, tumors, and local cysts. When impaction occurs in the anterior region, esthetics are compromised. This report describes the successful approach to treatment for a young boy who had 2 supernumerary teeth associated with impaction of the left central and lateral permanent incisors. Treatment consisted of extracting the supernumerary teeth and performing maxillary expansion with a modified Haas appliance to guide the left central incisor into its appropriate position. The teeth erupted spontaneously after maxillary expansion and an increase in space. A fixed edgewise appliance was placed incrementally to correct the maxillary anterior tooth positions and finish the treatment. Adequate esthetics and function were achieved. Copyright © 2012 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.

  8. Sequential supernumerary teeth development in a non-syndromic patient; report of a rare case.

    Science.gov (United States)

    Jafarian, Mohammad; Nazemi, Bahareh; Bargrizan, Majid; Ramezani, Jamileh; Ansari, Ghassem

    2013-11-01

    Isolated impacted supernumerary teeth are quite rare, but they can be seen associated with several syndromes such as cleidocranial dysostosis or Gardner's syndrome. This article aims to discuss a case of sequential formation of supernumerary teeth with no other associated disease or syndrome. A 17-year-old Iranian male with 8 impacted supernumerary teeth was referred to the department of pediatric dental clinic at Shahid Beheshti Medical University in Tehran with a history of several impacted unerupted teeth. Repeated and periodical clinical and radiographic examinations revealed newly formed teeth buds in unusual dental ages. All extra teeth were associated with generalized enamel hypoplasia to some degree on their relative permanent adjacent teeth. The patient did not have any record of a systemic disease or any syndromic condition to relate his dental problem to. This rare condition involved repeated and continued formation of extra teeth out of the normal numbers and dental age evident in serial radiographs.

  9. Impacted Supernumerary Teeth–Early or Delayed Intervention: Decision Making Dilemma?

    Science.gov (United States)

    Marwah, Nikhil

    2012-01-01

    Abstract Supernumerary teeth are considered to be one of the most significant dental anomalies affecting the primary and early mixed dentition and may cause a variety of pathological disturbances to the developing permanent dentition. Early diagnosis and prompt treatment is necessary for prevention of deleterious effects on dentoalveolar structures. However, the time of intervention is the most crucial factor governing the outcome of surgical management of hyperdontia. The aim of this case report is to share knowledge about management of such cases, which might assist the clinician in decision-making in cases of impacted supernumerary teeth. How to cite this article: Gupta S, Marwah N. Impacted Supernumerary Teeth–Early or Delayed Intervention: Decision Making Dilemma?. Int J Clin Pediatr Dent 2012;5(3):226-230. PMID:25206175

  10. Impacted supernumerary teeth-early or delayed intervention: decision making dilemma?

    Science.gov (United States)

    Gupta, Seema; Marwah, Nikhil

    2012-09-01

    Supernumerary teeth are considered to be one of the most significant dental anomalies affecting the primary and early mixed dentition and may cause a variety of pathological disturbances to the developing permanent dentition. Early diagnosis and prompt treatment is necessary for prevention of deleterious effects on dentoalveolar structures. However, the time of intervention is the most crucial factor governing the outcome of surgical management of hyperdontia. The aim of this case report is to share knowledge about management of such cases, which might assist the clinician in decision-making in cases of impacted supernumerary teeth. How to cite this article: Gupta S, Marwah N. Impacted Supernumerary Teeth-Early or Delayed Intervention: Decision Making Dilemma?. Int J Clin Pediatr Dent 2012;5(3):226-230.

  11. Use of a Piezosurgery Technique to Remove a Deeply Impacted Supernumerary Tooth in the Anterior Maxilla

    Directory of Open Access Journals (Sweden)

    Shintaro Sukegawa

    2015-01-01

    Full Text Available Deeply impacted supernumerary teeth in the anterior maxillary cannot be generally removed by the conventional labial or palatal surgical approach because of the risk of damaging the surrounding soft tissues and the possibility of injuring the roots of adjacent permanent teeth. In piezosurgery, bony tissues are selectively cut, thereby avoiding the soft tissue damage caused by rotary cutting instruments. We report the case of a 15-year-old Japanese boy from whom a deeply impacted supernumerary tooth in the anterior maxillary was safely removed through the floor of the nasal cavity. The surgical extraction was performed without damaging the nasal mucosa or adjacent structures such as the roots of the adjacent permanent teeth. Considering that piezosurgery limits the extent of surgical invasion, this technique can be practiced as a minimally invasive and safe surgical procedure for treating suitably selected cases with a deeply impacted supernumerary tooth.

  12. Multiple Supernumerary Teeth in a Non-Syndromic Patient: A Case Report

    Directory of Open Access Journals (Sweden)

    Majid Eshgh Pour

    2013-01-01

    Full Text Available Introduction: Multiple supernumerary teeth are a rare phenomenon. It occurs more often in patients with syndromes such as Gardner's syndrome, cleidocranial dysplasia and so on. This phenomenon in absence of such syndromes is rare. The purpose of this report was to introduce a case of non-syndromic multiple supernumerary impacted teeth.Case Report: A 29-year-old woman with no skeletal, metabolic, systemic and mental disorder was referred to oral and maxillofacial department of Mashhad dental school. In clinical evaluation, seven Permanent teeth were missing. In radiographic evaluation, there were a total of 15 impacted teeth which 7 of them were supernumerary.Conclusion: Missing or Excess of one or more teeth usually leads to occlusal and functional problems. In these cases, a complete clinical and radiographic examination accompanieal by a precise history should be performed to plan a suitable surgical-orthodontic-prosthetic treatment.

  13. Sequential supernumerary teeth development in a non-syndromic patient; report of a rare case.

    Directory of Open Access Journals (Sweden)

    Mohammad Jafarian

    2013-12-01

    Full Text Available Isolated impacted supernumerary teeth are quite rare, but they can be seen associated with several syndromes such as cleidocranial dysostosis or Gardner's syndrome. This article aims to discuss a case of sequential formation of supernumerary teeth with no other associated disease or syndrome. A 17-year-old Iranian male with 8 impacted supernumerary teeth was referred to the department of pediatric dental clinic at Shahid Beheshti Medical University in Tehran with a history of several impacted unerupted teeth. Repeated and periodical clinical and radiographic examinations revealed newly formed teeth buds in unusual dental ages. All extra teeth were associated with generalized enamel hypoplasia to some degree on their relative permanent adjacent teeth. The patient did not have any record of a systemic disease or any syndromic condition to relate his dental problem to. This rare condition involved repeated and continued formation of extra teeth out of the normal numbers and dental age evident in serial radiographs.

  14. Molecular cytogenetic analysis and clinical manifestations of a case with de novo mosaic ring chromosome 7

    Directory of Open Access Journals (Sweden)

    Fang Jye-Siung

    2011-02-01

    Full Text Available Abstract Aim Clinical and molecular cytogenetic investigations of a newborn girl exhibiting facial dysmorphism with developmental delay. Methods Phenotypic evaluation was first applied to examine the proband's developmental status. Computed tomography and colour transcranial Doppler were used then to investigate her brain structure and function. Subsequently, chromosomal abnormalities were examined by karyotyping and fluorescent in situ hybridization was performed to investigate size of fragments lost at the two distal ends of the ring chromosome 7. In addition, multicolour banding was applied to rule out structural rearrangement occurs in between the ring chromosome 7. Results The proband was born with mosaic supernumerary ring chromosome 7, without a normal karyotype detected in the peripheral blood lymphocytes. The distal arm of chromosome 7p (at least 255 kb from the telomere was part of an extra ring chromosome 7. In addition, the distal arm of 7q, at least 8 kb from the telomere, was missing. There was no other chromosomal rearrangement detected by multicolour banding. Interpretation This is the 19th reported case of complete ring chromosome 7 mosaicism and the first survived case with mosaic supernumerary ring 7 without a normal karyotype detected in the peripheral lymphocytes.

  15. Rheology modification with ring polymers

    Science.gov (United States)

    Vlassopoulos, Dimitris

    It is now established that experimental unconcatenated ring polymers can be purified effectively by means of fractionation at the critical condition. For molecular weights well above the entanglement threshold, purified rings relax stress via power-law (with an exponent of about -0.4), sharply departing from their linear counterparts. Experimental results are in harmony with modeling predictions and simulations. Here, we present results from recent interdisciplinary efforts and discuss two challenges: (i) the nonlinear shear rheology of purified ring melts is also very different from that of unlinked chains. Whereas the latter exhibit features that can be explained, to a first approach, in the framework in the tube model, the former behave akin to unentangled chains with finite extensibility and exhibit much small deformation at steady state. (ii) blends of rings and linear polymers exhibit unique features in different regimes: The addition of minute amounts of linear chains drastically affects ring dynamics. This relates to ring purity and the ability of unlinked linear chains to thread rings. With the help of simulations, it is possible to rationalize the observed surprisingly slow viscoelastic relaxation, which is attributed to ring-linear and ring-ring penetrations. On the other hand, adding small amounts of rings to linear polymers of different molecular weights influences their linear and nonlinear rheology in an unprecedented way. The blend viscosity exceeds that of the slower component (linear) in this non-interacting mixture, and its dependencies on composition and molecular weight ratio are examined, whereas the role of molecular architecture is also addressed. Consequently, closing the ends of a linear chain can serve as a powerful means for molecular manipulation of its rheology. This presentation reflects collaborative efforts with S. Costanzo, Z-C. Yan, R. Pasquino, M. Kaliva, S. Kamble, Y. Jeong, P. Lutz, J. Allgaier, T. Chang, D. Talikis, V

  16. An epidemiological study on supernumerary teeth: a survey on 5,000 people.

    Science.gov (United States)

    Kumar, Dara Kalyan; Gopal, K Saraswathy

    2013-07-01

    The formation of dental tissues is a highly delicate and complex phenomenon. Any alteration in this process leads to various dental anomalies which affect the tooth number, size, shape and structure. Supernumerary teeth are one such anomaly which affects the tooth number. Supernumerary teeth can give rise to various complications and pathologies or they may have a familial / syndromic association. They may occur along with other dental anomalies. Thus, such teeth have a definite clinical significance. The aim of the following study was to know the prevalence of the supernumerary teeth and the distribution of the cases according to the age, sex, jaw, region, eruption status, and the position. A total of 5000 patients were examined for a period of 1 year's duration and they were divided into different groups. Group I consisted of individuals who were aged between 5-20 years, Group II consisted of individuals who were aged between 21-40 years, and Group III consisted of individuals who were aged 41 years and above. The dental examination was conducted by using a mouth mirror and a probe, to determine the presence of supernumerary teeth. All the cases with supernumerary teeth were further observed and the details were recorded in a prepared porforma. These cases were also subjected to general physical examinations (to rule out any syndromes) and radiographic examinations. Photographs were also made. Although supernumerary teeth is an unusual anomaly, it is not as rare as was previously reported. The identification of this anomaly could provide a hint towards the possibility of complications, pathologies, other dental anomalies, syndromes and a familial association.

  17. The dynamics of supernumerary tooth development are differentially regulated by Sprouty genes.

    Science.gov (United States)

    Lagronova-Churava, Svatava; Spoutil, Frantisek; Vojtechova, Simona; Lesot, Herve; Peterka, Miroslav; Klein, Ophir D; Peterkova, Renata

    2013-07-01

    In mice, a toothless diastema separates the single incisor from the three molars in each dental quadrant. In the prospective diastema of the embryo, small rudimentary buds are found that are presumed to be rudiments of suppressed teeth. A supernumerary tooth occurs in the diastema of adult mice carrying mutations in either Spry2 or Spry4. In the case of Spry2 mutants, the origin of the supernumerary tooth involves the revitalization of a rudimentary tooth bud (called R2), whereas its origin in the Spry4 mutants is not known. In addition to R2, another rudimentary primordium (called MS) arises more anteriorly in the prospective diastema. We investigated the participation of both rudiments (MS and R2) in supernumerary tooth development in Spry2 and Spry4 mutants by comparing morphogenesis, proliferation, apoptosis, size and Shh expression in the dental epithelium of MS and R2 rudiments. Increased proliferation and decreased apoptosis were found in MS and R2 at embryonic day (ED) 12.5 and 13.5 in Spry2(-/-) embryos. Apoptosis was also decreased in both rudiments in Spry4(-/-) embryos, but the proliferation was lower (similar to WT mice), and supernumerary tooth development was accelerated, exhibiting a cap stage by ED13.5. Compared to Spry2(-/-) mice, a high number of Spry4(-/-) supernumerary tooth primordia degenerated after ED13.5, resulting in a low percentage of supernumerary teeth in adults. We propose that Sprouty genes were implicated during evolution in reduction of the cheek teeth in Muridae, and their deletion can reveal ancestral stages of murine dental evolution. Copyright © 2013 Wiley Periodicals, Inc.

  18. Morphological and topographical characteristics of posterior supernumerary molar teeth: an epidemiological study on 25,186 subjects.

    Science.gov (United States)

    Cassetta, Michele; Altieri, Federica; Giansanti, Matteo; Di-Giorgio, Roberto; Calasso, Sabrina

    2014-11-01

    To investigate the prevalence , gender difference , arch , morphology and position within the arch of supernumerary molar (SM) teeth in a referred Italian Caucasian population. Records of 25,186 young patients were evaluated. Only data related to supernumerary teeth in the posterior region of the jaws were analyzed. The diagnosis of hyperdontia was formulated during the clinical and radiological examinations based on panoramic radiographs. Statistical analysis was conducted at level of subjects in the assessment of prevalence of SMs and sex ratio. Statistical analysis was conducted at level of teeth according to their morphological and topographic characteristics. The analysis of association between supernumerary morphology and arch, between supernumerary position and arch and between morphology and position was performed using the χ2 test (P≤ 0.05). 61 posterior supernumerary teeth were found in 45 patients. The male to female ratio was 2.5:1 ;the mean age was 21.23 (IC:95%).The SMs were found more frequently in the maxilla (62.3%) than in the mandible; supernumerary teeth (60.7%) were more frequent than supplemental teeth. The SMs were mostly of tuberculate shape (56.8%) and paramolars teeth (64.9%) were more common than distomolars. 54% of teeth were erupted in the arch. No statistically significant relationship were found between the supernumerary teeth shape and the arch (P= 0.087) , between supernumerary teeth position and the arch (P=0.511) and between morphology and position (P=0.216). Epidemiological studies related to supernumerary teeth can be useful to clinicians in the early diagnosis of this anomaly. In this retrospective study the prevalence of SMs was 0.18%. SMs were more frequent in males and in the maxilla. Supernumerary were more frequent than supplemental; the conical morphology and paramolar position were the most common shape and position.

  19. Unusual Case of a Talon Cusp on a Supernumerary Tooth in Association with a Mesiodens

    Directory of Open Access Journals (Sweden)

    Prashant Babaji

    2010-06-01

    Full Text Available Talon cusp is an accessory cusp similar to a projection, extending from the cingulum or cemento-enamel junction to the incisal edge. It occurs on labial or palatal surfaces of primary or permanent anterior teeth in both arches. This accessory cusp can occur as an isolated entity or in association with other dental anomalies. Occurrence of a talon cusp on supernumerary teeth is rare and uncommon. This paper reports an unusual case of a talon cusp on a supernumerary tooth in association with mesiodens.

  20. Dentigerous cyst in the maxilla associated with two supernumerary teeth: A rare entity

    Directory of Open Access Journals (Sweden)

    Sk. Abdul Mahmud

    2015-01-01

    Full Text Available A dentigerous cyst is a developmental odontogenic cyst, which apparently develops by accumulation of fluid between the reduced enamel epithelium and the crown of an unerupted tooth. Through various cases that have been reported, it is observed that 95% of this cyst is associated with permanent dentition while only 5-6% is in association with supernumerary teeth. Mesiodens, a supernumerary tooth situated between the maxillary central incisors, has a prevalence of 0.15-1.9%. Here, a dentigerous cyst in association with a pair of impacted mesiodens is reported in a 56-year-old female patient.

  1. Diagnosis and Management of Supernumerary (Mesiodens: A Review of the Literature

    Directory of Open Access Journals (Sweden)

    G. Meighani

    2010-03-01

    Full Text Available Supernumerary tooth is one of the developmental problems in children. Mesiodens is a supernumerary tooth present in the midline between the two central incisors. It usually results in oral problems such as malocclusion, food impaction, poor aesthetics, and cyst formation. The prevalence of mesiodens varies between 0.09% and 2.05% in different studies.This paper reviews current literature on etiology, prevalence, diagnosis, and management of this problem. Accordingly, early diagnosis and treatment is suggested to preventorthodontic and pathologic complications.

  2. Unusual case of a talon cusp on a supernumerary tooth in association with a mesiodens.

    Science.gov (United States)

    Babaji, Prashant; Sanadi, Firoza; Melkundi, Mahesh

    2010-01-01

    Talon cusp is an accessory cusp similar to a projection, extending from the cingulum or cemento-enamel junction to the incisal edge. It occurs on labial or palatal surfaces of primary or permanent anterior teeth in both arches. This accessory cusp can occur as an isolated entity or in association with other dental anomalies. Occurrence of a talon cusp on supernu-merary teeth is rare and uncommon. This paper reports an unusual case of a talon cusp on a supernumerary tooth in association with mesiodens.

  3. Navigation-Guided Extraction of Impacted Supernumerary Teeth: A Case Report.

    Science.gov (United States)

    Wang, Jing; Cui, Nian-Hui; Guo, Yu-Jiao; Zhang, Wei

    2017-06-01

    Supernumerary teeth usually result in retarded eruption, malocclusion, poor esthetics, and cyst formation. Management involves surgical extraction, which can be challenging in certain complicated cases owing to the risk of injury to young permanent tooth germs or fragile roots. The present report describes a novel preoperative computer-assisted and intraoperative navigation-guided surgical treatment for a case of complicated impacted supernumerary teeth. The report highlights accurate tooth location and minimal invasion with use of the navigation-guided system. Moreover, it discusses various treatment considerations during such a procedure. Copyright © 2017 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  4. Non-syndromic multiple supernumerary teeth in permanent dentition: a rare phenomenon.

    Science.gov (United States)

    Yadav, Rakesh Kumar; Rao, Jitendra; Yadav, Lakhya; Hasija, Mukesh

    2013-05-22

    Hyperdontia or supernumerary teeth in the absence of associated systemic condition or syndrome is an uncommon phenomenon. Non-syndromic supernumerary teeth need to have periodical radiographic observation. In the case of asymptomatic condition, as they impacted in the jaw, a careful examination is necessary because they may develop into pathological status such as dentigerous cysts. Surgical removal of such teeth is indicated if evidence of any pathologies, such as cystic lesion, resorption, delayed eruption, altered eruption and displacement of adjacent teeth, is evident or have occurred.

  5. Molarization and development of multiple supernumerary teeth in the premolar region.

    Science.gov (United States)

    Manrique Morá, María Cinta; Bolaños Carmona, María Victoria; Briones Luján, María Teresa

    2004-01-01

    This case is the radiological diagnosis of a supernumerary premolar with the molarization of both lower second premolars in a 12-year-old child. Ten years after the diagnosis, the delayed development of another 4 supernumerary premolars was detected. Orthopantomography during mixed dentition allowed the detection of anomalies not clinically suspected. Any alteration in the number of teeth should suggest the potential of associated dental anomalies, indicating the long-term clinical and radiological follow-up of the patient during the second decade of life.

  6. Supernumerary Spacing of Rainbows Produced by an Elliptical-Cross-Section Cylinder. II. Experiment.

    Science.gov (United States)

    Adler, C L; Phipps, D; Saunders, K W; Nash, J K; Lock, J A

    2001-05-20

    We measured the supernumerary spacing parameter of the first- and second-order rainbows of two glass rods, each having an approximately elliptical cross section, as a function of the rod's rotation angle. We attribute large fluctuations in the supernumerary spacing parameter to small local inhomogeneities in the rod's refractive index. The low-pass filtered first-order rainbow experimental data agree with the prediction of ray-tracing-wave-front modeling to within a few percent, and the second-order rainbow data exhibit additional effects that are due to rod nonellipticity.

  7. Inactivation of IL11 signaling causes craniosynostosis, delayed tooth eruption, and supernumerary teeth

    DEFF Research Database (Denmark)

    Nieminen, Pekka; Morgan, Neil V; Fenwick, Aimée L

    2011-01-01

    Craniosynostosis and supernumerary teeth most often occur as isolated developmental anomalies, but they are also separately manifested in several malformation syndromes. Here, we describe a human syndrome featuring craniosynostosis, maxillary hypoplasia, delayed tooth eruption, and supernumerary...... and remodeling of limb bones has been previously described. We conclude that IL11 signaling is essential for the normal development of craniofacial bones and teeth and that its function is to restrict suture fusion and tooth number. The results open up the possibility of modulation of IL11 signaling...

  8. Hypohyperdontia: Agenesis of three third molars and mandibular centrals associated with midline supernumerary tooth in mandible

    Directory of Open Access Journals (Sweden)

    Sivakumar Nuvvula

    2010-01-01

    Full Text Available Agenesis of teeth in a patient who also presents with a supernumerary tooth is one of the rare numerical anomalies in human dentition. Agenesis of third molars was shown to be associated with other missing permanent teeth. A review of literature on hypodontia including third molar agenesis, hyperdontia and a concomitant presence of these two conditions which is termed as hypohyperdontia is presented along with a case showing agenesis of three third molars, both mandibular central incisors and a midline supernumerary tooth.

  9. Endodontic management of a supernumerary tooth fused to the maxillary permanent lateral Incisor

    Directory of Open Access Journals (Sweden)

    Avinash A Patil

    2014-01-01

    Full Text Available The aim of this case report is to present the endodontic management of a supernumerary tooth fused to the maxillary left lateral incisor. Such anomalies pose a challenge even to the most experienced clinician in treating these teeth. This report described a case of 21-year-old male patient with a classic case of complete fusion of maxillary left lateral incisor and a supernumerary tooth. A modified access preparation was made and two separate root canal orifices were identified. Both root canal systems were prepared separately and obturated efficiently until accepted lengths. This reported case highlights the importance of clinical and radiographic correlation in arriving to a definitive diagnosis.

  10. Mechanical Working Group meeting minutes

    Energy Technology Data Exchange (ETDEWEB)

    1992-12-01

    This documents contains the minutes and viewgraphs from the October 27--28, 1992 meeting on the subject of power generation and delivery systems for military applications. Attendees represented the US Air Force and NASA. The thermal management panel reported on the capillary pump loop test facility, thermal control systems and compressors, and the oxygen heat pipe flight experiment. The aerospace power panel reported on the integrated power unit for the more electric airplane, the solar dynamic power system, the modular high temperature gas cooled reactor-gas-turbine program, the multi-megawatt CBC power system, and analytical modeling for heat pipe performance. The terrestrial power panel reported on a free piston stirling engine power generation system, fuel cell vehicles, and the advanced gas turbine project.

  11. Topological rings

    CERN Document Server

    Warner, S

    1993-01-01

    This text brings the reader to the frontiers of current research in topological rings. The exercises illustrate many results and theorems while a comprehensive bibliography is also included. The book is aimed at those readers acquainted with some very basic point-set topology and algebra, as normally presented in semester courses at the beginning graduate level or even at the advanced undergraduate level. Familiarity with Hausdorff, metric, compact and locally compact spaces and basic properties of continuous functions, also with groups, rings, fields, vector spaces and modules, and with Zorn''s Lemma, is also expected.

  12. Ring interferometry

    CERN Document Server

    Malykin, Grigorii B; Zhurov, Alexei

    2013-01-01

    This monograph is devoted to the creation of a comprehensive formalism for quantitative description of polarized modes' linear interaction in modern single-mode optic fibers. The theory of random connections between polarized modes, developed in the monograph, allows calculations of the zero shift deviations for a fiber ring interferometer. The monograph addresses also the

  13. Number of supernumerary vitrified blastocysts is positively correlated with implantation and live birth in single-blastocyst embryo transfers.

    Science.gov (United States)

    Hill, Micah J; Richter, Kevin S; Heitmann, Ryan J; Lewis, Terrance D; DeCherney, Alan H; Graham, James R; Widra, Eric; Levy, Michael J

    2013-05-01

    To estimate whether live birth in single-blastocyst transfers is correlated with the number of sibling supernumerary vitrified blastocysts (embryos not transferred) generated from that same cycle. Retrospective cohort study. A large academic assisted reproduction clinic. All single-blastocyst transfers in 2010 graded as "good" embryos by Society for Assisted Reproductive Technologies (SART) criteria. None. Implantation and live birth. Of the 655 single-blastocyst transfers that met inclusion criteria, implantation occurred in 65% and live birth in 54% of cycles. In chi-square analysis, patients with supernumerary vitrified blastocysts had a statistically higher implantation rate (65% versus 50%) and live-birth rate (56% versus 41%) when compared with patients without supernumerary blastocysts. Univariate logistic regression demonstrated an increase in implantation (OR 1.09; 95% CI, 1.03-1.15) and live birth (OR 1.06; 95% CI, 1.02-1.09) with increasing number of supernumerary blastocysts. Multivariate logistic regression analysis demonstrated that patient age and the number of supernumerary blastocysts were statistically significantly associated with implantation and live birth. The number of supernumerary vitrified blastocysts correlated positively with the odds of implantation and live birth in good quality single-blastocyst transfers. Patients with supernumerary blastocysts are good candidates for single-embryo transfer. Published by Elsevier Inc.

  14. Supernumerary right kidney with it own urethra: a case report and ...

    African Journals Online (AJOL)

    Supernumerary right kidney with it own urethra: a case report and literature review. Ilunga Kandolo Simon, Matungulu Matungulu Charles, Musau Nkola Angel, Kimba Mukanya Pascal, Mwarabu Much'apa Bienfait, Lumbu Nora, Ndaie Kabamba Julie, Kabange Umba Irene, Elmer Delgado, Kabyla Ilunga Benjamin, Ngongo ...

  15. Multidisciplinary management of impacted central incisors due to supernumerary teeth and an associated dentigerous cyst

    Directory of Open Access Journals (Sweden)

    Ritesh R Kalaskar

    2011-01-01

    Full Text Available Supernumerary teeth are the most common developmental dental anomaly resulting from hyperactivity of dental lamina, dichotomy, environmental factor, or polygenetic process of atavism. Supernumerary teeth present classical oral complication such as impaction of adjacent teeth, crowding, diastema formation, rotation, displacement of teeth, and occlusal interference. A dentigerous cyst associated with anterior supernumerary teeth (mesiodens is rare and accounts for 5% of all dentigerous cysts. The present case reports describe the successful management of the impacted permanent maxillary central incisor positioned high in the vestibule. A combination of surgical and orthodontic techniques was employed to improve treatment outcome with greater hard and soft tissue preservation and to prevent psychological problems. In the surgical phase, supernumerary teeth and dentigerous cyst were removed. Subsequently traction was employed by bonding bracket on the labial surface using closed and open eruption techniques. Successively, fixed orthodontic treatment was started to align permanent maxillary central incisors in an occlusal plane. Thus, combination of surgical and orthodontic method can be the treatment of choice over surgical extraction, implant placement, and surgical repositioning.

  16. Clinical management of a fused upper premolar with supernumerary tooth: a case report.

    Science.gov (United States)

    Cho, Kyu-Min; Jang, Ji-Hyun; Park, Sang-Hyuk

    2014-11-01

    In dentistry, the term 'fusion' is used to describe a developmental disorder of dental hard tissues. In the permanent dentition, fusion of a normal tooth and a supernumerary tooth usually involves the incisors or canines. However, a few cases of fusion involving premolars have also been reported to date. We present a rare case in which fusion of the maxillary left second premolar and a supernumerary tooth in a 13-year-old girl was diagnosed using cone beam computed tomography (CBCT, Alphard-3030, Asahi Roentgen Ind. Co., Ltd.). The tooth was bicuspidized after routine nonsurgical root canal treatment, and the separated teeth underwent appropriate restoration procedures. The second premolar and supernumerary tooth remained asymptomatic without any signs of inflammation after a follow-up period of 9 years. Identification of anatomical anomalies is important for treatment in cases involving fusion with supernumerary tooth, and therefore the microscopic examinations and CBCT are essential for the diagnosis. Fused teeth can be effectively managed by the comprehensive treatment which includes both endodontic and periodontal procedures.

  17. Evaluation of the accuracy of cone beam computed tomography on measuring impacted supernumerary teeth.

    Science.gov (United States)

    Demiriz, Levent; Hazar Bodrumlu, Ebru; İçen, Murat; Durmuşlar, Mustafa Cenk

    2016-11-01

    Supernumerary teeth may affect the tooth eruption negatively if they occur on the eruption way, and the treatment choice is usually the extraction to prevent the impaction of adjacent permanent teeth. CBCT enables clear and three dimensional images, and it may be helpful to determine the exact location and to measure the dimensions of the supernumerary tooth to avoid any complication during the extraction process. The aim of the present study was to evaluate the accuracy of CBCT on measuring the tooth length and crown width of impacted supernumerary teeth. Twenty-five impacted supernumerary teeth were evaluated using CBCT, and each sample's tooth length and crown width were measured prior to the extraction. After all the extractions were completed, the actual measurements were performed on the same samples. The differences between CBCT and actual measurements were evaluated statistically. Measurements on CBCT images were significantly larger than the actual measurements on tooth length and crown width. For tooth length and crown width, p value was found as 0.045, and <0.001, respectively. The results of the present study should be considered as important by clinicians during the treatment planning to decrease any complication risk under certain conditions such as being so close to an important anatomical structure or the root of an adjacent tooth. SCANNING 38:579-584, 2016. © 2016 Wiley Periodicals, Inc. © Wiley Periodicals, Inc.

  18. [Diagnosis and treatment of supernumerary teeth in the premaxillary region: a literature review].

    Science.gov (United States)

    Ratson, T

    2013-01-01

    Supernumerary teeth are more frequently located in the premaxillary region. Mesiodentes are the most common supernumerary teeth, occurring in 0.15% to 1.9% of the population. Supernumerary teeth are frequently diagnosed in a random radiograph, or after clinical symptoms appear. The majority of the complications consist of delayed or ectopic eruption of the permanent incisors. It is important for the clinician to be aware of the phenomenon and its implications, in order to diagnose it as early as possible. Extraction of the supernumerary teeth in the late mixed dentition, will minimize the chances of damaging the adjacent permanent teeth, but will reduce the possibility of spontaneous eruption of an impacted permanent incisor. Extraction in the early mixed dentition can expedite the eruption of the permanent incisor, although it may involve sedation or general anesthesia, due to lack of cooperation in the young patient. Because to the risk of uneruption of the permanent impacted incisor, exposure of the teeth and bonding a ligature or bracket at the same procedure, and providing a possibility for the dentist to make the incisor erupt after the first operation, should the incisor not erupt spontaneously. Treating these cases require the cooperation of pediatric dentist, orthodontic and dental surgeon, and sometimes the involvement of an anesthesiologist.

  19. An impacted central incisor due to supernumerary teeth: a multidisciplinary approach.

    Science.gov (United States)

    Ferrazzano, G F; Cantile, T; Roberto, L; Baldares, S; Manzo, P; Martina, R

    2014-07-01

    Hyperdontia is a disorder of odontogenesis characterised by excess teeth. Many complications can be associated with supernumerary teeth, such as crowding, tooth displacement, diastema, deep caries, retention or impaction, delayed eruption or ectopic eruption of adjacent teeth, aesthetic problems, neuralgic manifestations, root resorption of adjacent teeth, and dentigerous cyst formation with significant bone destruction. Treatment of hyperdontia depends on the area and number of supernumerary teeth, and also on the presence of pathologic processes that can affect them and/or the teeth of the normal series that could be erupted, retained or impacted. The present case report describes the clinical management of two impacted supernumerary teeth, which impeded the eruption of the maxillary right central incisor in a paediatric patient. A multidisciplinary treatment approach was planned, including the surgical removal of the supernumerary teeth and the orthodontic correction of the unerupted permanent maxillary right central incisor. Combined surgical and orthodontic treatment resulted in an aesthetically pleasant and balanced occlusion. Thus, early multidisciplinary treatment is required for greater hard and soft tissue preservation.

  20. Taurodontism in children with hypodontia and supernumerary teeth: a case control study.

    Science.gov (United States)

    Kan, Wayne Y W; Seow, W Kim; Holcombe, Trevor

    2010-01-01

    The aim of the present investigation was to compare the prevalence of taurodontism in the permanent mandibular first molars of nonsyndromic children with hypodontia and supernumerary teeth with age- and gender-matched controls. The crown-body root ratios of the permanent first molars were determined from orthopantomograms of 83 children with hypodontia (> or =1 missing teeth) and 37 children with supernumerary teeth (> or =1 extra teeth) compared with normal case controls. In children with hypodontia, only girls showed a significantly higher tendency for taurodontism compared to case controls (P=.003), while boys with hypodontia showed a similar prevalence of taurodontism as controls (P=.83). Children with multiple missing teeth were significantly more susceptible to taurodontism than children with a single missing tooth (P=.004). By contrast, the prevalence of taurodontism in children with supernumerary teeth was not significantly different from that of controls. Compared to normal case controls, children with nonsyndromic hypodontia are more likely to show taurodontism of the permanent first molar teeth whereas children with nonsyndromic supernumerary teeth are not.

  1. Nonsyndromic Bilateral Multiple Impacted Supernumerary Mandibular Third Molars: A Rare and Unusual Case Report

    Directory of Open Access Journals (Sweden)

    G. Siva Prasad Reddy

    2013-01-01

    Full Text Available A supernumerary tooth is that which is present additionally to the normal series and can be found in any region of the dental arch. An impacted tooth is defined as the one which is embedded in the alveolus, so that its eruption is prevented, or the tooth is locked in position by bone or the adjacent teeth. The occurrence of multiple supernumerary teeth in only one patient in the absence of an associated systemic condition or syndrome is considered as a rare phenomenon. The occurrence of supernumerary teeth in the lower molar region is rare. A prevalence of less than 2% of cases occurring in this region has been estimated. Their occurrence presents a clinical problem for orthodontists and oral surgeons. The cause, frequency, complications, and surgical operation of impacted teeth are always interesting subjects for study and research. An impacted tooth can result in caries, pulp disease, periapical and periodontal disease, temporomandibular joint disorder, infection of the fascial space, root resorption of the adjacent tooth, and even oral and maxillofacial tumours. The management of impacted wisdom teeth has changed over the past 20 years from removal of nonsymptomatic third molars to simple observation. The aim of this paper is to present a rare case of bilateral multiple impacted supernumerary mandibular third molars.

  2. Multiple crown size variables of the upper incisors in patients with supernumerary teeth compared with controls

    NARCIS (Netherlands)

    Khalaf, K.; Smith, R. N.; Elcock, C.; Brook, A. H.

    2009-01-01

    Aims: As part of ongoing studies of the aetiology of dental anomalies the aims of this study were to identify multiple components of tooth size of the upper permanent incisors in 34 patients with supernumerary teeth and to compare them with those in a control group to determine whether the presence

  3. Clinical management of a fused upper premolar with supernumerary tooth: a case report

    Directory of Open Access Journals (Sweden)

    Kyu-Min Cho

    2014-11-01

    Full Text Available n dentistry, the term 'fusion' is used to describe a developmental disorder of dental hard tissues. In the permanent dentition, fusion of a normal tooth and a supernumerary tooth usually involves the incisors or canines. However, a few cases of fusion involving premolars have also been reported to date. We present a rare case in which fusion of the maxillary left second premolar and a supernumerary tooth in a 13-year-old girl was diagnosed using cone beam computed tomography (CBCT, Alphard-3030, Asahi Roentgen Ind. Co., Ltd.. The tooth was bicuspidized after routine nonsurgical root canal treatment, and the separated teeth underwent appropriate restoration procedures. The second premolar and supernumerary tooth remained asymptomatic without any signs of inflammation after a follow-up period of 9 years. Identification of anatomical anomalies is important for treatment in cases involving fusion with supernumerary tooth, and therefore the microscopic examinations and CBCT are essential for the diagnosis. Fused teeth can be effectively managed by the comprehensive treatment which includes both endodontic and periodontal procedures.

  4. Prevalence and characteristics of supernumerary teeth in a non-syndrome Turkish population: associated pathologies and proposed treatment.

    Science.gov (United States)

    Celikoglu, Mevlut; Kamak, Hasan; Oktay, Hüsamettin

    2010-07-01

    The objectives of the present study were to investigate the prevalence and characteristics of supernumerary teeth and evaluate the associated pathologies and treatment protocol in a Turkish patient population. A retrospective study was performed using full-mouth periapical and panoramic radiographs of 3491 patients (2146 females and 1345 males) ranging in age from 12 to 25. For each patient with supernumerary teeth we recorded the demographic variables (including age, sex), number, location, position, type, and morphology of supernumerary teeth, associated pathologies or complications, and whether any treatment has been carried out. The Pearson chi-squared test was used to determine potential differences in the distribution of supernumerary teeth when stratified by gender. Supernumerary teeth were detected in 42 subjects (1.2%), of which 27 were males and 15 were females with a 1.8:1 male female ratio (psupernumerary teeth were mesiodens (31.3%) followed by premolar (25.0%), lateral (22.9%), distomolar (14.5%), paramolar (4.2%), and canine (2.1%). Of the 48 supernumerary teeth examined, 50.0% (n=24) were conical, 81.3% (n=39) were in a vertical position, and 20.8% (n=10) were erupted. Supernumerary teeth caused rotation or displacement of the adjacent teeth in 14 cases, and the impaction of the permanent teeth in 8 cases. The prevalence of supernumerary teeth in our series was found to be 1.2%, the most frequent type being mesiodens. Rotation or displacement of permanent teeth was the most frequent complication caused by supernumerary teeth.

  5. Unilateral fusion of a supernumerary tooth to a maxillary permanent lateral incisor: a report of a rare case.

    Science.gov (United States)

    Cunha, Rodrigo Sanches; Junaid, Alanna; Mello, Isabel

    2015-03-01

    A supernumerary tooth is an additional entity to the normal series of teeth that may occur in isolation or may be fused to a normal counterpart. Diagnosis and delineation of an accurate treatment plan in cases involving supernumerary teeth are often a challenge. This report describes a case of unilateral fusion of a supernumerary tooth to a maxillary permanent lateral incisor in which a conservative approach was used to reach a favorable outcome. Copyright © 2015 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  6. Incidence of impacted and supernumerary teeth-a radiographic study in a North Greek population.

    Science.gov (United States)

    Fardi, Anastasia; Kondylidou-Sidira, Athena; Bachour, Zaki; Parisis, Nikolaos; Tsirlis, Anastasios

    2011-01-01

    The aim of the present study was to investigate the prevalence of impacted and supernumerary teeth, apart from third molars. This was a retrospective study of 1.239 panoramic radiographs taken of patients who presented to the Department of Dentoalveolar Surgery, Implantology and Radiology at the School of Dentistry of the Aristotle University of Thessaloniki, Greece between 1991 and 1999. The panoramic radiographs and dental records were reviewed in order to determine whether there were impacted or supernumerary teeth. Observations were also made on the space in dentition, corresponding to the position of each impacted tooth, the lack of space for tooth eruption, transmigration, retained primary teeth or prosthetic restoration. A total of 170 (13.7%) patients presented with at least one impacted tooth. None of them had an impacted incisor. Impacted canines were the most prevalent dental anomaly (8.8%), followed by impacted premolars (2.2%). Supernumerary teeth (1.8%) and impacted molars (1%) were the least common anomalies. Among the 225 impacted teeth, the most frequently affected teeth were the canines (59.6%), followed by premolars (19.1%), and supernumerary teeth (15.1%), while the incidence of impacted molars was substantially lower (6.2%). The most frequently impacted teeth were the maxillary canine, the second mandibular premolar and the second mandibular molar. The majority of the supernumerary teeth consisted of mesiodens. There was space in the dentition of each impacted tooth in 29.3% of the cases examined; there was a retained primary tooth in 25.1%, and a prosthetic restoration had been constructed in 24%. Insufficient space for the eruption of the impacted tooth and transmigration was observed in 17.3% and 4.2% of the cases, respectively.

  7. The genome of Nectria haematococca: contribution of supernumerary chromosomes to gene expansion

    Energy Technology Data Exchange (ETDEWEB)

    Coleman, J.J.; Rounsley, S.D.; Rodriguez-Carres, M.; Kuo, A.; Wasmann, C.c.; Grimwood, J.; Schmutz, J.; Taga, M.; White, G.J.; Zhuo, S.; Schwartz, D.C.; Freitag, M.; Ma, L.-J.; Danchin, E.G.J.; Henrissat, B.; Cutinho, P.M.; Nelson, D.R.; Straney, D.; Napoli, C.A.; Baker, B.M.; Gribskov, M.; Rep, M.; Kroken, S.; Molnar, I.; Rensing, C.; Kennell, J.C.; Zamora, J.; Farman, M.L.; Selker, E.U.; Salamov, A.; Shapiro, H.; Pangilinan, J.; Lindquist, E.; Lamers, C.; Grigoriev, I.V.; Geiser, D.M.; Covert, S.F.; Temporini, S.; VanEtten, H.D.

    2009-04-20

    The ascomycetous fungus Nectria haematococca, (asexual name Fusarium solani), is a member of a group of .50 species known as the"Fusarium solani species complex". Members of this complex have diverse biological properties including the ability to cause disease on .100 genera of plants and opportunistic infections in humans. The current research analyzed the most extensively studied member of this complex, N. haematococca mating population VI (MPVI). Several genes controlling the ability of individual isolates of this species to colonize specific habitats are located on supernumerary chromosomes. Optical mapping revealed that the sequenced isolate has 17 chromosomes ranging from 530 kb to 6.52 Mb and that the physical size of the genome, 54.43 Mb, and the number of predicted genes, 15,707, are among the largest reported for ascomycetes. Two classes of genes have contributed to gene expansion: specific genes that are not found in other fungi including its closest sequenced relative, Fusarium graminearum; and genes that commonly occur as single copies in other fungi but are present as multiple copies in N. haematococca MPVI. Some of these additional genes appear to have resulted from gene duplication events, while others may have been acquired through horizontal gene transfer. The supernumerary nature of three chromosomes, 14, 15, and 17, was confirmed by their absence in pulsed field gel electrophoresis experiments of some isolates and by demonstrating that these isolates lacked chromosome-specific sequences found on the ends of these chromosomes. These supernumerary chromosomes contain more repeat sequences, are enriched in unique and duplicated genes, and have a lower G+C content in comparison to the other chromosomes. Although the origin(s) of the extra genes and the supernumerary chromosomes is not known, the gene expansion and its large genome size are consistent with this species' diverse range of habitats. Furthermore, the presence of unique genes on

  8. The genome of Nectria haematococca: contribution of supernumerary chromosomes to gene expansion.

    Directory of Open Access Journals (Sweden)

    Jeffrey J Coleman

    2009-08-01

    Full Text Available The ascomycetous fungus Nectria haematococca, (asexual name Fusarium solani, is a member of a group of >50 species known as the "Fusarium solani species complex". Members of this complex have diverse biological properties including the ability to cause disease on >100 genera of plants and opportunistic infections in humans. The current research analyzed the most extensively studied member of this complex, N. haematococca mating population VI (MPVI. Several genes controlling the ability of individual isolates of this species to colonize specific habitats are located on supernumerary chromosomes. Optical mapping revealed that the sequenced isolate has 17 chromosomes ranging from 530 kb to 6.52 Mb and that the physical size of the genome, 54.43 Mb, and the number of predicted genes, 15,707, are among the largest reported for ascomycetes. Two classes of genes have contributed to gene expansion: specific genes that are not found in other fungi including its closest sequenced relative, Fusarium graminearum; and genes that commonly occur as single copies in other fungi but are present as multiple copies in N. haematococca MPVI. Some of these additional genes appear to have resulted from gene duplication events, while others may have been acquired through horizontal gene transfer. The supernumerary nature of three chromosomes, 14, 15, and 17, was confirmed by their absence in pulsed field gel electrophoresis experiments of some isolates and by demonstrating that these isolates lacked chromosome-specific sequences found on the ends of these chromosomes. These supernumerary chromosomes contain more repeat sequences, are enriched in unique and duplicated genes, and have a lower G+C content in comparison to the other chromosomes. Although the origin(s of the extra genes and the supernumerary chromosomes is not known, the gene expansion and its large genome size are consistent with this species' diverse range of habitats. Furthermore, the presence of unique

  9. RING SYSTEM

    African Journals Online (AJOL)

    ); 0 “C1211; 30.13 ('BuP. o. J,.,_. = 12.2 1-11). @500 (OCH._,, dq,. J“. = 34.6. JR. = 15.8 H2). 124.39 (CF3. dq, JPF = 269.0, JR. = 9.7 Hz). 35.63 (PC. cl. .... The compound was prepared using the same technique from the boron ring [31 [2 g.

  10. Surgical management of impacted incisors in associate with supernumerary teeth: a combine case report of spontaneous eruption and orthodontic extrusion.

    Science.gov (United States)

    Das, D; Misra, J

    2012-01-01

    Maxillary permanent incisors impaction is not a frequent case in dental practice, but its treatment is challenging because of its importance to facial esthetics. Supernumerary teeth are the main cause of impaction of upper incisors. Supernumerary teeth when present can cause both esthetic and pathologic problems. Early detection of such teeth is most important if complications are to be avoided. In this reported case, the orthopantamogram of a 9-year-old boy revealed two impacted supernumerary teeth in the maxillary anterior region, which was interfering with the eruption of the permanent central incisors. The impacted supernumerary teeth were surgically removed, 11 was repositioned in the arch as it was situated very high in the arch, close to the nasal floor. Twenty-one erupted spontaneously but orthodontic force was applied over 11 to bring it into the occlusion and alignment was achieved with 0.014 mm NiTi wire.

  11. Surgical management of impacted incisors in associate with supernumerary teeth: A combine case report of spontaneous eruption and orthodontic extrusion

    Directory of Open Access Journals (Sweden)

    D Das

    2012-01-01

    Full Text Available Maxillary permanent incisors impaction is not a frequent case in dental practice, but its treatment is challenging because of its importance to facial esthetics. Supernumerary teeth are the main cause of impaction of upper incisors. Supernumerary teeth when present can cause both esthetic and pathologic problems. Early detection of such teeth is most important if complications are to be avoided. In this reported case, the orthopantamogram of a 9-year-old boy revealed two impacted supernumerary teeth in the maxillary anterior region, which was interfering with the eruption of the permanent central incisors. The impacted supernumerary teeth were surgically removed, 11 was repositioned in the arch as it was situated very high in the arch, close to the nasal floor. Twenty-one erupted spontaneously but orthodontic force was applied over 11 to bring it into the occlusion and alignment was achieved with 0.014 mm NiTi wire.

  12. Relinkable Ring Signature

    Science.gov (United States)

    Suzuki, Koutarou; Hoshino, Fumitaka; Kobayashi, Tetsutaro

    In this paper, we propose the concept of a relinkable ring signature, which is a ring signature with ring reformation function, i.e., a signer can delegate ring reformation ability separately from signing ability to his/her proxy. The relinkable ring signature can be applicable to proxy ring reformation, anonymization of past-generated signature, or ring signature for dynamic group. We also propose a concrete relinkable ring signature scheme that uses pairing in the random oracle model.

  13. Multiple crown size variables of the upper incisors in patients with supernumerary teeth compared with controls.

    Science.gov (United States)

    Khalaf, K; Smith, R N; Elcock, C; Brook, A H

    2009-12-01

    As part of ongoing studies of the aetiology of dental anomalies the aims of this study were to identify multiple components of tooth size of the upper permanent incisors in 34 patients with supernumerary teeth and to compare them with those in a control group to determine whether the presence of a supernumerary tooth has a local effect on the size of the surrounding dentition. The labial and occlusal aspects of the clinical crowns of the upper permanent central and lateral incisors on the study models of 74 subjects were digitally imaged and measured using an image analysis system and automated macro (34 patients with supernumerary in the upper incisor region: 17 males and 17 females and 40 controls: 20 males and 20 females). The macro-defined 17 variables from each view. From the labial view these were: the mesio-distal and occluso-gingival length and additional measurements along 25 and 75% of the mesio-distal line and at 25, 50 and 75% along the occluso-gingival line such that all these sub-divisions extended to the periphery of the tooth. From the occlusal view these were: the mesio-distal and labio-lingual lengths, and additional variables that sub-divided the mesio-distal again at 25 and 75% along the length and at 25, 50 and 75% along the labio-lingual dimension. Principal component analysis (PCA) was used to identify the key factors with the most random variability. Comparisons were then carried out between the supernumerary cases and control group using 2-way ANOVA. Seven factors of tooth size for the upper central incisors and eight factors for the upper lateral incisors were extracted. Most of these variables were found to be larger in the supernumerary group than in the control. Statistically significant differences were found for 5 out of 7 and 4 out of 8 for the upper central and lateral incisors respectively. A number of factors of tooth size were identified and found to be larger in the supernumerary group compared to the control (7 for upper

  14. Hemangioendothelioma of bone in a patient with a constitutional supernumerary marker

    DEFF Research Database (Denmark)

    Rogatto, S R; Rainho, C A; Zhang, Z M

    1999-01-01

    A 13-year old girl was diagnosed as having a bone hemangioendothelioma. Cytogenetic studies identified the presence of a small supernumerary marker chromosome in this patient. Classical cytogenetic methods using G-, C-, Ag-NOR-banding were supplemented by spectral karyotyping (SKY) and fluorescence...... in situ hybridization to reveal a karyotype 47,XX,+mar.ish der(22)(D22S543+) karyotype in cells derived from the tumor and lymphocytes. These findings suggest that the supernumerary marker chromosome originated from the proximal centromeric region of chromosome 22, and that trisomy of the region 22q11...... was not associated with adverse phenotypic effects, but that the presence of trisomy 22q11 may be related to the development of this tumor....

  15. Dynamic mosaicism involving an unstable supernumerary der(22) chromosome in cat eye syndrome.

    Science.gov (United States)

    Urioste, M; Visedo, G; Sanchís, A; Sentís, C; Villa, A; Ludeña, P; Hortigüela, J L; Martínez-Frías, M L; Fernández-Piqueras, J

    1994-01-01

    We have studied a girl, her sister and her mother who had a supernumerary marker chromosome in mosaicism. The marker was studied by cytogenetic methods and non-isotopic in situ hybridization with the single D22S9 DNA probe which maps to 22q11. The supernumerary chromosome was derived from a chromosome 22 and it did not present the same morphology in all the cells. At least 5 distinct types of the marker chromosome were detected and some of them were probably derived from each other (dynamic mosaicism). The proposita had an MCA pattern consistent with mild cat eye syndrome, while her sister and her mother had some of the manifestations described in this syndrome. A specific correlation could be established between phenotype and karyotype.

  16. Supernumerary Nipples, Congenital Scoliosis, Spina Bifida, Diastematomyelia, and Crossed Renal Ectopia in a child

    Directory of Open Access Journals (Sweden)

    Kiran Panthee

    2016-11-01

    Full Text Available Introduction: Supernumerary nipples are common anomalies which may be associated with several systemic disorders, particularly urinary tract abnormalities.   Case report: Here we report a case of a 4½ year old male presenting to the pediatric out patient clinic with fever for three days and recurrent sinopulmonary infections. The child had supernumerary nipples over the right side with deformed thoracic cage, congenital scoliosis, diastematomyelia, crossed renal ectopia, and spina bifida. All the conditions present together did not match any syndrome reported till date.   Conclusion: This was a rare syndrome and did not match fully with any known syndromes till date. This case warranted further investigation for its definite diagnosis but we do not have resources to that extent.

  17. A descriptive study of 113 unerupted supernumerary teeth in 79 pediatric patients in Barcelona.

    Science.gov (United States)

    Ferrés-Padró, Eduard; Prats-Armengol, Jordi; Ferrés-Amat, Elvira

    2009-03-01

    Unerupted supernumerary teeth, depending on the morphology, number and distribution can give rise to various alterations in the eruption and development of those permanent teeth to which they are related. We aimed to make an epidemiological and descriptive study of the clinical characteristics of patients in Barcelona, their surgical treatment and how said treatment was hindered. A descriptive study including 113 supernumerary teeth from 79 healthy pediatric patients between 5 and 19 years of age, which underwent surgery in our hospital during a 2 year period (May 2005 / May 2007), taking into account the variables of personal data, gender, age, location, number, morphology, position-axis, radiological study, surgical treatment, related pathologies, and surgical complications. Male patients (51) were more frequently affected than female (28) patients mainly within the central incisors-mesiodens (53.16%), in which the unique form (68.52%) predominates in conoid morphology (69.62%). Surgical treatment was done by palatal/lingual extraction (49.37%), with few surgical complications (only 1 case of post-surgical bleeding). Incidence in supernumerary teeth is higher among male patients (ratio M:F of 1.82:1). They are most frequently located in the maxilla (82%), specifically, in the premaxilla (77%). Most cases presented only one supernumerary tooth (68.5%) and, in multiple cases, the premolar region is predominant. The conoid shape is the commonest morphology (69.62%). Surgical extraction, was done by palatal/lingual in 49.37% of the cases, as opposed to the vestibular approach in 45.57%.

  18. Impacted Supernumerary Teeth–Early or Delayed Intervention: Decision Making Dilemma?

    OpenAIRE

    Gupta, Seema; Marwah, Nikhil

    2012-01-01

    Abstract Supernumerary teeth are considered to be one of the most significant dental anomalies affecting the primary and early mixed dentition and may cause a variety of pathological disturbances to the developing permanent dentition. Early diagnosis and prompt treatment is necessary for prevention of deleterious effects on dentoalveolar structures. However, the time of intervention is the most crucial factor governing the outcome of surgical management of hyperdontia. The aim of this case re...

  19. Bilateral fusion of mandibular second molars with supernumerary teeth: case report

    Directory of Open Access Journals (Sweden)

    Nunes Eduardo

    2002-01-01

    Full Text Available Fusion is a developmental anomaly characterized by the union of two adjacent teeth. In this article we report a rare case of bilateral fusion of permanent mandibular second molars with supernumerary teeth. The rarity with which this entity appears, along with its complex characteristics, often make it difficult to treat. The endodontic management of one tooth is described, as well as the successful treatment of a periradicular lesion.

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

    Directory of Open Access Journals (Sweden)

    Ahmet Yagci

    2014-01-01

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

  1. Existence of inelastic supernumerary nuclear rainbow in 16O+12C scattering

    Science.gov (United States)

    Ohkubo, S.; Hirabayashi, Y.; Ogloblin, A. A.

    2017-08-01

    The existence of a supernumerary nuclear rainbow in inelastic scattering is reported. This is done by studying inelastic 16O scattering from 12C, exciting the 2+ (4.44 MeV) state of 12C and elastic scattering at the incident energies in the range 124-200 MeV, using the coupled channels method. An extended double folding potential is used. This is derived from realistic wave functions for 12C and 16O calculated with a microscopic α cluster model and a finite-range density-dependent nucleon-nucleon force. Excitations to the 2+ (4.44 MeV), 3- (9.64 MeV), and 4+ (14.08 MeV) states of 12C, and the 3- (6.13 MeV) and 2+ (6.92 MeV) states of 16O are included in the coupled channels calculations. The emergence of the supernumerary bow is understood by the properties of both the Luneburg-lens-like potential in the internal region and diffuse attraction in the outer region. The existence of a supernumerary rainbow for inelastic scattering in addition to the existence of a dynamically created secondary rainbow and a dynamically refracted primary rainbow for elastic scattering, which are not observed in meteorological rainbows, further deepens the understanding of nuclear rainbows.

  2. Under your nose: a rare finding during dissection provides insights into maxillary supernumerary teeth.

    Science.gov (United States)

    Redwood, C; Townsend, G C; Ghabriel, M; Brook, A H

    2014-09-01

    A supernumerary tooth was found during anatomical dissection. The position of this tooth, still impacted in the maxilla, and the associated pathology make this a rare case. During dissection by dental students of the sagittally-sectioned head of a cadaver, a supernumerary tooth was identified in the mid-palatal area. Further dissection revealed a swelling with a thin bony covering related to the crown of the tooth. The maxilla was removed en bloc and radiographic examination, CT scanning, electron microscopy and histology were undertaken. The tooth had a crenulated occlusal surface and a single root. It was 25 mm posterior to the root apex of the permanent upper central incisor. The swelling, confirmed by radiographs and CT imaging to be associated with the crown, occupied approximately one-third of the maxillary sinus. The 3D shape of the cystic lesion was visualized by a composite digital movie. The crown form, position of the tooth and the associated dentigerous cyst suggested it was a palatally developing supernumerary premolar which had been displaced to the palatal midline by the expanding cyst. This rare case highlights the learning and teaching opportunities available during dissection, showing important variations in both development and clinical anatomy. © 2014 Australian Dental Association.

  3. Lifetime measurement of ATF damping ring

    Energy Technology Data Exchange (ETDEWEB)

    Okugi, T. [Tokyo Metropolitan Univ. (Japan); Hayano, H.; Kubo, K.; Naito, T.; Terunuma, N.; Urakawa, J. [High Energy Accelerator Research Organization, Tsukuba (Japan); Zimmermann, F. [Stanford Univ., CA (US). Stanford Linear Accelerator Center

    1998-06-01

    The purpose of the ATF damping ring is the development of technologies for producing a low emittance beam required in future linear colliders such as JLC. The lifetime of the damping ring is very short (typically a few minutes). It is limited by elastic beam-gas scattering along with a small dynamic aperture, and by single intra-beam scattering (Touschek effect). The Touschek lifetime strongly depends upon the charge density of the beam, especially, the size of the vertical emittance. In this paper, the authors report the results of beam lifetime measurements in the ATF damping ring and the estimation of the vertical emittance from these measurements.

  4. Prevalence of supernumerary teeth in permanent dentition among patients attending a dental college in South Kerala: A pilot study

    Directory of Open Access Journals (Sweden)

    Devi Gopakumar

    2014-01-01

    Full Text Available Background: Supernumerary teeth are excess number of teeth formed as a result of disturbances occurring during odontogenesis. The objective of the study was to investigate the prevalence of supernumerary teeth in permanent dentition among patients attending a dental college in South Kerala. Materials and Methods: In this study, 11,141 subjects attending the out-patient department of PMS College of Dental Science and Research, Thiruvananthapuram, Kerala were examined for supernumerary teeth like mesiodens, paramolars, distomolars, third premolars, second laterals, and odontomes during the period May 2012-May 2013. Ethical clearance was obtained from the institutional ethical committee for the study. Results: The study showed a prevalence of 0.39% and a sex distribution of M:F equal to 2:1. The incidence of supernumerary teeth found was as follows: mesiodens (0.14%, paramolars (0.13%, third premolar (0.04%, distomolar (0.03%, extralateral (0.02%, and odontome (0.03%. The male:female gender predilection was as follows: mesiodens (3:1, paramolars (1.3:1, third premolar (4:1, distomolar (1:2, and odontome (2:1. Conclusion: This study showed a 0.39% prevalence of supernumerary teeth in this population.

  5. Radical theory of rings

    CERN Document Server

    Gardner, JW

    2003-01-01

    Radical Theory of Rings distills the most noteworthy present-day theoretical topics, gives a unified account of the classical structure theorems for rings, and deepens understanding of key aspects of ring theory via ring and radical constructions. Assimilating radical theory's evolution in the decades since the last major work on rings and radicals was published, the authors deal with some distinctive features of the radical theory of nonassociative rings, associative rings with involution, and near-rings. Written in clear algebraic terms by globally acknowledged authorities, the presentation

  6. Nitrile O-ring Cracking: A Case of Vacuum Flange O-ring Failures

    Energy Technology Data Exchange (ETDEWEB)

    Dees, Craig

    2016-07-01

    A review of recent nitrile O-ring failures in ISO-KF vacuum flange connections in glovebox applications is presented. An investigation of a single “isolated” o-ring failure leads to the discovery of cracked nitrile o-rings in a glovebox atmospheric control unit. The initial cause of the o-ring failure is attributed to ozone degradation. However, additional investigation reveals nitrile o-ring cracking on multiple gloveboxes and general purpose piping, roughly 85% of the nitrile o-rings removed for inspection show evidence of visible cracking after being in service for 18 months or less. The results of material testing and ambient air testing is presented, elevated ozone levels are not found. The contributing factors of o-ring failure, including nitrile air sensitivity, inadequate storage practices, and poor installation techniques, are discussed. A discussion of nitrile o-ring material properties, the benefits and limitations, and alternate materials are discussed. Considerations for o-ring material selection, purchasing, storage, and installation are presented in the context of lessons learned from the nitrile o-ring cracking investigation. This paper can be presented in 20 minutes and does not require special accommodations or special audio visual devices.

  7. Prenatal diagnosis and molecular cytogenetic characterization of mosaicism for a small supernumerary marker chromosome derived from ring chromosome 2

    Directory of Open Access Journals (Sweden)

    Chih-Ping Chen

    2012-09-01

    Conclusion: Molecular cytogenetic techniques such as aCGH, interphase FISH and QF-PCR on uncultured amniocytes, and SKY, MCB and metaphase FISH on cultured amniocytes are useful for characterization of the nature of a prenatally detected sSMC.

  8. Saturn's Spectacular Ring System

    Science.gov (United States)

    Lissauer, Jack J.; DeVincenzi, Donald (Technical Monitor)

    2001-01-01

    Saturn's beautiful rings have fascinated astronomers since they were first observed by Galileo in 1610. The main rings consist of solid particles mostly in the 1 cm - 10 m range, composed primarily of water ice. The ring disk is exceptionally thin - the typical local thickness of the bright rings is tens of meters, whereas the diameter of the main rings is 250,000 km! The main rings exhibit substantial radial variations "ringlets", many of which are actively maintained via gravitational perturbations from Saturn's moons. Exterior to the main rings lie tenuous dust rings, which have little mass but occupy a very large volume of space. This seminar will emphasize the physics of ring-moon interactions, recent advances in our understanding of various aspects of the rings obtained from observations taken during 1995 when the rings appeared edge-on to the Earth and then to the Sun, and observations in subsequent years from HST.

  9. U.S. 15 Minute Precipitation Data

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — U.S. 15 Minute Precipitation Data is digital data set DSI-3260, archived at the National Climatic Data Center (NCDC). This is precipitation data. The primary source...

  10. Multiple bilateral supernumerary mandibular premolars in a non-syndromic patient with associated orthokeratised odontogenic cyst- A case report and review of literature

    Directory of Open Access Journals (Sweden)

    Vikrant O Kasat

    2012-01-01

    Full Text Available Multiple supernumerary teeth are very rare, accounting for less than 1% of cases. They are commonly associated with syndromes like Gardner′s syndrome and cleidocranial dysostosis and cleft lip and palate. Non-syndromic multiple supernumerary teeth have a predilection to occur in the mandibular premolar region. Orthokeratinized odontogenic cyst (OOC is a relatively uncommon developmental cyst comprising about 10% of the cases that had been previously implied as odontogenic keratocysts. More than half of the cases of OOC are associated with impacted tooth; but not a single case of OOC associated with supernumerary teeth is reported. Hence, the purpose of this article is to report the first case of multiple supernumerary mandibular premolars associated with OOC in a 35-year-old male and to review the literature associated with multiple bilateral supernumerary mandibular premolars.

  11. Algebra success in 20 minutes a day

    CERN Document Server

    LearningExpress, LLC

    2014-01-01

    Stripped of unnecessary math jargon but bursting with algebra essentials, this handy guide covers vital algebra skills that apply to real-world scenarios. Whether you're new to algebra or just looking for a refresher, Algebra Success in 20 Minutes a Day offers a lesson plan that provides quick and thorough instruction in practical, critical skills. All lessons can be completed in just 20 minutes a day, for a manageable and non-intimidating learning experience.

  12. Fusion of central incisors with supernumerary teeth: a 10-year follow-up of multidisciplinary treatment.

    Science.gov (United States)

    Steinbock, Nelly; Wigler, Ronald; Kaufman, Arieh Y; Lin, Shaul; Abu-El Naaj, Imad; Aizenbud, Dror

    2014-07-01

    Macrodontia of anterior teeth may occur as an isolated condition or as a result of fusion or gemination and may cause clinical problems such as tooth crowding and esthetic problems. Preliminary planning and careful management are often required by a dental team comprising an orthodontist, an endodontist, a prosthodontist, and an oral surgeon. A multidisciplinary treatment approach in a case with fused teeth is presented. A 9-year-old girl presented with macrodontia of a left maxillary central incisor. The patient was referred to the orthodontic department because of a large central incisor as a result of fusion with an unspecific supernumerary tooth. The surgical procedure included sectioning off the mesial segment as far as possible, both apically and subgingivally, and extracting 1 of the fused supernumerary teeth. During the sectioning procedure, the pulp of the remaining tooth was exposed at the middle third of the root. Direct pulp capping was performed by an endodontist using mineral trioxide aggregate. Twelve weeks later, orthodontic treatment was commenced, and finally after a 26-month orthodontic treatment period, the central incisors' crown was restored using composite material. A 10-year clinical and radiographic follow-up revealed that the remaining resected central incisor kept its vitality, and the patient was pleased with the esthetic result. Proper interdisciplinary treatment planning of complicated cases such as anomalous teeth, which involve fusion to a supernumerary tooth, may lead to minimal invasive conservative procedures that maintain tooth vitality and result in a pleasing esthetic result. Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  13. Supernumerary, ectopic tooth in the maxillary antrum presenting with recurrent haemoptysis

    Directory of Open Access Journals (Sweden)

    Hameed Anam

    2010-11-01

    Full Text Available Abstract Background Ectopic eruption of teeth in non-dental sites is a rare phenomenon and can present in a variety of ways such as chronic or recurrent sinusitis, sepsis, nasolacrimal duct obstruction, headaches, ostiomeatal complex disease and facial numbness. However, presentation of such patients with recurrent haemoptysis has not been described in the literature so far. We have described a case of an ectopic, supernumerary molar tooth in the maxillary antrum in a patient who initially presented with haemoptysis. Case presentation A 45-year-old male presented with a 2-month history of episodic haemoptysis. A pedunculated growth from the inferior nasal turbinate was seen with fibre-optic visualization. Although the patient was empirically started on antibiotic and anti-allergic therapy, there was no improvement after a few weeks and the patient had recurrent episodes of haemoptysis. Fibre-optic visualization was repeated showing bilateral osteomeatal erythema. Computed tomography scan of the paranasal sinuses demonstrated complete opacification of the left maxillary antrum along with a focal area of density comparable to bone. An ectopic, supernumerary molar tooth was found in the left maxillary antrum on endoscopic examination and subsequently removed. In addition, copious purulent discharge was seen. Post-operatively, the patient was treated with a 10-day course of oral amoxicillin-clavulanate. On follow-up, he reported resolution of symptoms. Conclusion Recurrent haemoptysis has not been described as a presentation for a supernumerary, ectopic tooth in literature before. We recommend that in patients with sinusitis-type of opacification of maxillary antrum and whose condition is refractory to conventional medical treatment, consideration should be given to the investigation of possible underlying anomalies as the cause of such symptoms. Presence of foreign bodies and ectopic teeth in paranasal sinuses can be reliably excluded with the use

  14. Comparison of mesenchymal-like stem/progenitor cells derived from supernumerary teeth with stem cells from human exfoliated deciduous teeth.

    Science.gov (United States)

    Lee, Sunray; An, Soyoun; Kang, Tae Hoon; Kim, Kyung Hye; Chang, Nicole Hyesoo; Kang, Seongman; Kwak, Chang Kon; Park, Hyun-Sook

    2011-11-01

    Dental tissue has been the focus of attention as an easily accessible postnatal tissue source of high-quality stem cells. Since the first report on the dental pulp stem cells (DPSCs) from permanent third molar teeth, stem cells from human exfoliated deciduous teeth (SHED) were identified as a population distinct from DPSCs. In this study, we compared DPSCs from supernumerary teeth and SHED in three age- and sex-matched patients. Dental samples were obtained from the three patients, who were 6 years old and male, with the parental consent of the three donors, and then isolated cells from dental pulp for comparative analysis between supernumerary DPSCs and SHED. Colony-forming unit fibroblast levels and the proliferation rate of supernumerary DPSCs were slightly lower than that of SHED. The expression of cell surface antigens in supernumerary DPSCs and SHED were almost identical. Cells were mainly expressing endogenous mesodermal and ectodermal lineage markers. Differentiation capacity to osteogenic, adipogenic and chondrogenic lineage was similar in the SHED and supernumerary DPSCs. Migration assay revealed that both supernumerary DPSCs and SHED rapidly migrated toward wounded areas. Supernumerary DPSCs were altered in cell growth after storage for 2 years. Specially, the population doubling time of supernumerary DPSCs increased while that of SHED remained nearly unchanged. Both supernumerary teeth and deciduous teeth share many characteristics, such as highly proliferative clonogenic cells with a similar immunophenotype to that of mesenchymal stem cells, although they are inferior to SHED for long-term banking. Our findings suggest that supernumerary teeth are also easily accessible and noninvasive sources of postnatal stem cells with multipotency and regenerative capacity.

  15. Prevalence and characterıstıcs of supernumerary teeth in a child population from Central Anatolıa - Turkey.

    Science.gov (United States)

    Arikan, Volkan; Ozgul, Betul Memis; Firdevs, Tulga O Z

    2013-12-01

    This article aimed to characterize the incidence of supernumerary teeth in Turkish children according to sex, location, number and morphology and to explore possible correlations between these variables. The study population comprised 7,551 non-syndromic patients aged 3-16 years who applied for routine check-ups at the Ankara University Department of Pediatric Dentistry between January 2009 and January 2010. The population included children in deciduous, mixed and permanent dentition. Both clinical and radiographic examinations were conducted. Demographic variables (age, sex) as well as number, location (maxilla or mandible), position, type and morphology of supernumeraries were recorded for all patients with supernumerary teeth. Supernumerary teeth with odontomes were also noted. Of the 7,551 patients examined, supernumerary teeth were detected in 74 patients (0.98%). Of these, 48 were male and 26 were female (male-to-female ratio: 1.84:1). A total of 84 supernumerary teeth were detected, 80 (95.2%) of which were permanent teeth and 4 (4.8%) of which were deciduous teeth (n=4). Most supernumerary teeth (n=59, 70.2%) were located in the maxillary arch. The most common supernumerary teeth were mesiodens (36.9%), followed by supernumerary teeth located in the maxillary incisor region (33.3%), the mandibular premolar region (17.9%), the mandibular molar region (5.9%), the mandibular incisor region (4.8%) and the mandibular canine region (1.2%). The prevalence of supernumerary teeth was found to be 0.98% and mesiodens was the most frequent type.

  16. Alternative loop rings

    CERN Document Server

    Goodaire, EG; Polcino Milies, C

    1996-01-01

    For the past ten years, alternative loop rings have intrigued mathematicians from a wide cross-section of modern algebra. As a consequence, the theory of alternative loop rings has grown tremendously. One of the main developments is the complete characterization of loops which have an alternative but not associative, loop ring. Furthermore, there is a very close relationship between the algebraic structures of loop rings and of group rings over 2-groups. Another major topic of research is the study of the unit loop of the integral loop ring. Here the interaction between loop rings and group ri

  17. Pindborg tumor arising in association with an impacted supernumerary tooth in the anterior maxilla.

    Science.gov (United States)

    Waingade, Manjushri; Gawande, Pushkar; Aditya, Amita; Medikeri, Raghavendra S

    2014-06-01

    Pindborg tumor/Calcifying Epithelial Odontogenic Tumor (CEOT) is a benign epithelial odontogenic tumor which shows locally aggressive behavior and accounts for less than 1% of all odontogenic tumors. The most frequent location is the mandibular premolar and molar area; less frequently the lesion is found in the maxilla. Since histopathology remains the main method for definitive diagnosis, this lesion presents an enigma to a clinician when lesions occur in atypical locations. The authors report a case of CEOT in the maxillary anterior region associated with an impacted supernumerary tooth (mesiodens).

  18. An EMG Interface for the Control of Motion and Compliance of a Supernumerary Robotic Finger

    Science.gov (United States)

    Hussain, Irfan; Spagnoletti, Giovanni; Salvietti, Gionata; Prattichizzo, Domenico

    2016-01-01

    In this paper, we propose a novel electromyographic (EMG) control interface to control motion and joints compliance of a supernumerary robotic finger. The supernumerary robotic fingers are a recently introduced class of wearable robotics that provides users additional robotic limbs in order to compensate or augment the existing abilities of natural limbs without substituting them. Since supernumerary robotic fingers are supposed to closely interact and perform actions in synergy with the human limbs, the control principles of extra finger should have similar behavior as human’s ones including the ability of regulating the compliance. So that, it is important to propose a control interface and to consider the actuators and sensing capabilities of the robotic extra finger compatible to implement stiffness regulation control techniques. We propose EMG interface and a control approach to regulate the compliance of the device through servo actuators. In particular, we use a commercial EMG armband for gesture recognition to be associated with the motion control of the robotic device and surface one channel EMG electrodes interface to regulate the compliance of the robotic device. We also present an updated version of a robotic extra finger where the adduction/abduction motion is realized through ball bearing and spur gears mechanism. We have validated the proposed interface with two sets of experiments related to compensation and augmentation. In the first set of experiments, different bimanual tasks have been performed with the help of the robotic device and simulating a paretic hand since this novel wearable system can be used to compensate the missing grasping abilities in chronic stroke patients. In the second set, the robotic extra finger is used to enlarge the workspace and manipulation capability of healthy hands. In both sets, the same EMG control interface has been used. The obtained results demonstrate that the proposed control interface is intuitive and can

  19. An EMG Interface for the Control of Motion and Compliance of a Supernumerary Robotic Finger.

    Science.gov (United States)

    Hussain, Irfan; Spagnoletti, Giovanni; Salvietti, Gionata; Prattichizzo, Domenico

    2016-01-01

    In this paper, we propose a novel electromyographic (EMG) control interface to control motion and joints compliance of a supernumerary robotic finger. The supernumerary robotic fingers are a recently introduced class of wearable robotics that provides users additional robotic limbs in order to compensate or augment the existing abilities of natural limbs without substituting them. Since supernumerary robotic fingers are supposed to closely interact and perform actions in synergy with the human limbs, the control principles of extra finger should have similar behavior as human's ones including the ability of regulating the compliance. So that, it is important to propose a control interface and to consider the actuators and sensing capabilities of the robotic extra finger compatible to implement stiffness regulation control techniques. We propose EMG interface and a control approach to regulate the compliance of the device through servo actuators. In particular, we use a commercial EMG armband for gesture recognition to be associated with the motion control of the robotic device and surface one channel EMG electrodes interface to regulate the compliance of the robotic device. We also present an updated version of a robotic extra finger where the adduction/abduction motion is realized through ball bearing and spur gears mechanism. We have validated the proposed interface with two sets of experiments related to compensation and augmentation. In the first set of experiments, different bimanual tasks have been performed with the help of the robotic device and simulating a paretic hand since this novel wearable system can be used to compensate the missing grasping abilities in chronic stroke patients. In the second set, the robotic extra finger is used to enlarge the workspace and manipulation capability of healthy hands. In both sets, the same EMG control interface has been used. The obtained results demonstrate that the proposed control interface is intuitive and can

  20. The phantom and the supernumerary phantom limb: historical review and new case.

    Science.gov (United States)

    Cipriani, Gabriele; Picchi, Lucia; Vedovello, Marcella; Nuti, Angelo; Fiorino, Mario Di

    2011-12-01

    The way we experience the world is determined by the way our brain works. The phantom limb phenomenon, which is a delusional belief of the presence of a non-existent limb, has a particular fascination in neurology. This positive phenomenon of the phantom limb raises theoretical questions about its nature. After a stroke, some patients experience the perception of an extra limb in addition to the regular set of two arms and two legs. This complex cognitive and perceptual distortion is called supernumerary phantom limb. Here, we review the pathogenesis and historical aspects, and report a new case.

  1. A comparison between various radiological techniques in the localization and analysis of impacted and supernumerary teeth.

    Science.gov (United States)

    Ziegler, Christoph M; Klimowicz, Thomas R

    2013-01-01

    An increasing number of different types of commercial cone-beam computed tomography (CBCT) devices are available for three-dimensional (3D) imaging in the field of dental and maxillofacial radiology. When removing impacted or supernumerary teeth, surgical teams often operate adjacent significant anatomical structures such as nerves, vessels, adjacent teeth roots, and paranasal sinuses. It is therefore important to choose the appropriate surgical approach to avoid iatrogenic damage to the essential anatomical neighbouring structures. CBCT, also called digital volume tomography (DVT), can visualize impacted and supernumerary teeth in all standard planes, as well as multisectional 3D views. These devices have shown to be highly beneficial in the assessment of small bony lesions and maxillofacial injuries. However, it is still necessary to determine the effectiveness of such devices in the assessment of impacted and supernumerary teeth, in comparison to the conventional radiological methods of intraoral X-rays and panoramic X-rays. During a period of 2 years, a total of 61 patients of whom majority had impacted teeth or supernumerary elements in the frontal maxillary region were studied with CBCT and treated at the St. Olavs University Hospital. Patients were referred to our Department of Oral and Maxillofacial Surgery with both conventional and digital intraoral X-rays and/or panoramic X-rays. None had any acute infections or odontogenic abscesses, and most presented with asymptomatic impacted tooth. A comparison between the preoperative conventional and the CBCT images, the resulting diagnoses, and the intraoperative findings as "gold standard" were made and recorded in a compiled scoring sheet. The objects of interest were researched with the magnification method. Each patient was identified only with a patient number. In contrast to the conventional X-rays, the pre-surgical evaluation with the CBCT revealed detailed imaging of significant anatomical structures and

  2. Three Supernumerary Marker Chromosomes in a Patient with Developmental Delay, Mental Retardation, and Dysmorphic Features

    OpenAIRE

    Hu, Jie; Madan-Khetarpal, Suneeta; Serrano Russi, Alvaro H.; Kochmar, Sally; DeWard, Stephanie J.; Sathanoori, Malini; Surti, Urvashi

    2011-01-01

    We characterized three supernumerary marker chromosomes (SMCs) simultaneously present in a 2-year- and 10-month-old male patient with mental retardation and dysmorphic features. Peripheral blood chromosome analysis revealed two to three SMCs in 25/26 cells analyzed. The remaining one cell had one SMC. Microarray comparative genomic hybridization (aCGH) showed mosaicism for gains of 5q35.3, 15q11.2q13.3, and 18p11.21q11.1 regions. All three gains contain multiple OMIM genes. FISH studies indic...

  3. A comparison between various radiological techniques in the localization and analysis of impacted and supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Christoph M Ziegler

    2013-01-01

    Full Text Available Background and Objectives: An increasing number of different types of commercial cone-beam computed tomography (CBCT devices are available for three-dimensional (3D imaging in the field of dental and maxillofacial radiology. When removing impacted or supernumerary teeth, surgical teams often operate adjacent significant anatomical structures such as nerves, vessels, adjacent teeth roots, and paranasal sinuses. It is therefore important to choose the appropriate surgical approach to avoid iatrogenic damage to the essential anatomical neighbouring structures. CBCT, also called digital volume tomography (DVT, can visualize impacted and supernumerary teeth in all standard planes, as well as multisectional 3D views. These devices have shown to be highly beneficial in the assessment of small bony lesions and maxillofacial injuries. However, it is still necessary to determine the effectiveness of such devices in the assessment of impacted and supernumerary teeth, in comparison to the conventional radiological methods of intraoral X-rays and panoramic X-rays. Materials and Methods: During a period of 2 years, a total of 61 patients of whom majority had impacted teeth or supernumerary elements in the frontal maxillary region were studied with CBCT and treated at the St. Olavs University Hospital. Patients were referred to our Department of Oral and Maxillofacial Surgery with both conventional and digital intraoral X-rays and/or panoramic X-rays. None had any acute infections or odontogenic abscesses, and most presented with asymptomatic impacted tooth. A comparison between the preoperative conventional and the CBCT images, the resulting diagnoses, and the intraoperative findings as "gold standard" were made and recorded in a compiled scoring sheet. The objects of interest were researched with the magnification method. Each patient was identified only with a patient number. Results: In contrast to the conventional X-rays, the pre-surgical evaluation with

  4. Double dens invaginatus in an impacted molariform supernumerary tooth: An unique case

    Directory of Open Access Journals (Sweden)

    Anegundi R

    2008-05-01

    Full Text Available Dens invaginatus is a relatively rare developmental anomaly affecting usually the permanent maxillary lateral incisor. Various factors have been put forward regarding its pathogenesis. Involvement of crown/root has been reported as the coronal and radicular variety of dens invaginatus. One of the rarest variant is the Double dens invaginatus and only a few cases have been reported in the literature.This article focuses on a case of double dens invaginatus in an impacted maxillary anterior supernumerary tooth, the associated complications and its management

  5. Geometry success in 20 minutes a day

    CERN Document Server

    LLC, LearningExpress

    2014-01-01

    Whether you're new to geometry or just looking for a refresher, Geometry Success in 20 Minutes a Day offers a 20-step lesson plan that provides quick and thorough instruction in practical, critical skills. Stripped of unnecessary math jargon but bursting with geometry essentials, Geometry Success in 20 Minutes a Day: Covers all vital geometry skills, from the basic building blocks of geometry to ratio, proportion, and similarity to trigonometry and beyond Provides hundreds of practice exercises in test format Applies geometr

  6. Phenotypic expansion of the supernumerary derivative (22) chromosome syndrome: VACTERL and Hirschsprung's disease.

    Science.gov (United States)

    Prieto, Juan C; Garcia, Nilda M; Elder, Frederick F; Zinn, Andrew R; Baker, Linda A

    2007-11-01

    Phenotypically healthy carriers of the balanced 11;22 translocation, the most frequent non-Robertsonian constitutional translocation known in human beings, are at risk of having a progeny with supernumerary derivative (22)t(11;22) syndrome [der(22) syndrome]. We present the cases of 2 male patients with supernumerary der(22) syndrome [47,XY,+der(22)t(11;22)(q23;q11.2)mat], yielding partial trisomy for 22pter-q11 and 11q23-qter. These cases expand the phenotype of the der(22) syndrome, with the first case highlighting the phenotypic overlap of VACTERL and the second adding Hirschsprung's disease and intestinal malrotation to the list of associated anorectal anomalies. Because der(22) syndrome and cat eye syndrome (partial tetrasomy of 22q11) share a similar region of extra dosage on 22q11 and both typically manifest an anorectal phenotype, a dosage-sensitive gene for anorectal anomalies may be present in this locus.

  7. Recurrent epistaxis caused by an intranasal supernumerary tooth in a young adult.

    Science.gov (United States)

    Al Dhafeeri, Hamed O; Kavarodi, Abdulmajid; Al Shaikh, Khalil; Bukhari, Ahmed; Al Hussain, Omair; El Baramawy, Ahmed

    2014-01-01

    Male, 27. Recurrent epistaxis. Nasal bleeding. -. -. Pediatrics and Neonatology. Congenital defects/diseases. Recurrent epistaxis is a common disorder among children and young adults. We report an unusual cause, intranasal supernumerary tooth causing friction with Little's area of the nasal septum. A 22-year-old male presented with recurrent, mild, unilateral left-sided epistaxis once to twice per month for 3 years. This usually occurred after minor nasal trauma or rubbing his nose. The patient also suffered from recurrent tonsillitis. There was neither history of blood transfusion or nasal packing, nor a history suggestive of bleeding diathesis. Anterior rhinoscopy revealed ivory white nasal mass antero-inferiorly in the left nasal cavity touching Little's area. There was no bleeding. Nasal endoscopy showed a white cylindrical bony mass 1 cm long arising from the floor of the nose, with no attachment to the nasal septum or the lateral wall of the nose. Examination of the right nasal cavity was unremarkable. Nasal teeth result from the ectopic eruption of supernumerary teeth and may cause a variety of symptoms including recurrent epistaxis. Their clinical and radiologic presentation is so characteristic that their diagnosis is not difficult. CT scan is helpful in planning management. Early extraction prevents further complications and prevents further attacks of epistaxis.

  8. Non-syndromic multiple supernumerary teeth in a family unit with a normal karyotype: case report.

    Science.gov (United States)

    Inchingolo, Francesco; Tatullo, Marco; Abenavoli, Fabio M; Marrelli, Massimo; Inchingolo, Alessio D; Gentile, Mattia; Inchingolo, Angelo M; Dipalma, Gianna

    2010-11-05

    Introduction. Hyperdontia is an odontostomatologic anomaly characterized by an excess in tooth number. It seems to occur more often in patients with hereditary factors concerning this anomaly: this case represents a rare form of hyperdontia, with bilateral multiple supernumerary teeth, with evident penetrance of the phenotype in the family unit engaged in the present study. The karyotype determination excludes a pathogenesis on chromosomal basis.Case report. A 30 years old patient came to our observation with five impacted teeth (1.8, 2.8, 3.8, 4.7 and 4.8), as well as with the presence of an impacted supernumerary tooth (distomolar 4.9). The patient was suggested to allow us to perform a radiologic screening to his two sisters aged 17 and 13 years.The X-ray photography showed that the elder sister had nine impacted teeth; these were 1.8 - 1.9 - 2.8 - 2.9 - 2.10 - 3.8 - 3.9 - 4.8 - 4.9; while the youngest sister had four impacted teeth, that is 1.8 - 1.9 - 2.8 - 2.9.Conclusions. The value of the present case report can be used as a paradigm for the assessment of the hereditary factors predisposing the onset of hyperdontia, and for the consequent management by oral surgeon of family units in which the odontostomatologic anomaly was detected without any syndromic forms.

  9. Analyses of 1100 supernumerary teeth in a nonsyndromic Turkish population: A retrospective multicenter study.

    Science.gov (United States)

    Bereket, C; Çakır-Özkan, N; Şener, İ; Bulut, E; Baştan, A İ

    2015-01-01

    The aim of this study was to analyze the clinical and radiological features of supernumerary teeth (ST), record the related complications, and discuss different forms of treatment. A total of 111,293 patients were examined over a 3-year period. The patients' ages and genders, in addition to the number, morphology, location, position, shape, developmental stage, and eruption status of ST and associated complications, were recorded. Among the 111,293 patients, there were 851 (0.76%) patients with 1100 ST. Of these patients, 478 (56.2%) were males, and 373 (43.8%) were females, with a mean age of 22.71. Most of the 1100 ST were located in the maxilla, 437 (39.72%) were a conical shape, with 82.81% of these including a fully developed tooth. A mesiodens was the most common type of supernumerary tooth (n=284, 33.37%), followed by distomolars (n=204, 23.97%) and parapremolars (n=146, 17.16%). Among the 1100 ST, 422 (38.36%) were associated with complications. No previous studies in the literature have examined in detail so many cases with ST. The demographic profile of the patients with ST presented herein provides useful additional epidemiological information.

  10. A rare case of impacted supernumerary premolar causing resorption of mandibular first molar

    Directory of Open Access Journals (Sweden)

    R V Murali

    2015-01-01

    Full Text Available The management of patients with pain in today′s general practice has become a major concern and sometimes this pain is related to some rare causes. A male patient aged 26 years reported with pain in the lower left molar region (36 and then an intra-oral periapical radiograph (IOPA, and orthopantomograph was taken. IOPA revealed the presence of supernumerary premolar causing pressure and root resorption of 36. Also, there was missing 21 and proximal decay in 11. Eleven was treated endodontically, and then bridge was done in relation to 11, 21 and 22. Lower anterior crowding was also present. The treatment plan was to extract 36 followed by orthodontic extrusion of the supernumerary premolar and also the correction of lower anterior crowding. Hidden approach (lingual orthodontics was used as the patient was insisting upon the braces not being seen outside during the course of the treatment. Later all ceramic bridge was done in relation to 11, 21 and 22. Orthodontic tooth extrusion techniques offer excellent treatment options for Partially Impacted tooth. It is a well-documented clinical method for extruding sound tooth material from within the alveolar socket by light forces. The use of lingual technique for forced eruption enhance acceptance of orthodontic treatment by adults. The treatment of a young adult patient illustrates the importance of treatment planning from one discipline to another, communication among team members and the benefits of working together in an interdisciplinary approach

  11. Non-syndromic multiple impacted supernumerary teeth with peripheral giant cell granuloma

    Directory of Open Access Journals (Sweden)

    Pankaj Bansal

    2011-01-01

    Full Text Available Peripheral giant cell granuloma (PGCG is a relatively frequent benign reactive lesion of the gingiva, originating from the periosteum or periodontal membrane following local irritation or chronic trauma. PGCG manifests as a red-purple nodule located in the region of the gingiva or edentulous alveolar margins. The lesion can develop at any age, although it is more common between the second and third decades of life, and shows a slight female predilection. PGCG is a soft tissue lesion that very rarely affects the underlying bone, although the latter may suffer superficial erosion. A supernumerary tooth is one that is additional to the normal series and can be found in almost any region of the dental arch. These teeth may be single, multiple, erupted or unerupted and may or may not be associated with syndrome. Usually, they cause one or the other problem in eruption or alignment of teeth, but may also present without disturbing the normal occlusion or eruption pattern. Management of these teeth depends on the symptoms. Presented here is a case of PGCG in relation to the lower left permanent first molar with three supernumerary teeth in the mandibular arch but no associated syndrome.

  12. Paternal uniparental isodisomy for chromosome 14 with mosaicism for a supernumerary marker chromosome 14.

    Science.gov (United States)

    Mattes, Joerg; Whitehead, Bruce; Liehr, Thomas; Wilkinson, Ian; Bear, John; Fagan, Kerry; Craven, Paul; Bennetts, Bruce; Edwards, Matthew

    2007-09-15

    Uniparental disomy (UPD) describes the inheritance of two homologous chromosomes from a single parent. Disease phenotypes associated with UPD and chromosomal imprinting, rather than with mutations, include Beckwith-Wiedemann syndrome (paternal UPD11p), Angelman syndrome (paternal UPD15), Prader-Willi syndrome (maternal UPD15), and transient neonatal diabetes (paternal UPD6). Here we report on the first case of paternal uniparental isodisomy of chromosome 14 with a mosaicism for a supernumerary marker chromosome 14. The patient demonstrated a small thorax with a 'coat hanger' shape of the ribs, kyphoscoliosis, hypoplasia of the maxilla and mandible, a broad nasal bridge with anteverted nares, contractures of the wrists with ulnar deviation bilaterally, diastasis recti, and marked muscle hypotonia. Vertical skin creases under the chin and stippled epiphyses of the humeri were features not previously described in patients with paternal UPD14. This case illustrates that as with the finding of an isochromosome, a supernumerary marker chromosome can be an important clue to the presence of UPD14. (c) 2007 Wiley-Liss, Inc.

  13. Ring chromosomes and low-grade gene amplification in an atypical lipomatous tumor with minimal nuclear atypia.

    Science.gov (United States)

    Storlazzi, Clelia Tiziana; Mertens, Fredrik; Domanski, Henryk; Fletcher, Christopher D M; Wiegant, Joop; Mandahl, Nils

    2003-07-01

    Atypical lipomatous tumors (ALTs) are characterized by supernumerary ring chromosomes and/or giant marker chromosomes, which typically are composed of interspersed, amplified 12q-sequences, are C-band negative, lack alpha-satellite sequences, and display high copy numbers of several oncogenes, including HMGA2 (a.k.a. HMGIC) and MDM2, from the 12q13-15 region. In the present study, we report the cytogenetic and molecular genetic findings in an ALT with minimal nuclear atypia from a 16-year-old boy. At G-banding analysis, 1-3 supernumerary ring chromosomes were detected. Combined binary ratio labeling fluorescence in situ hybridization (COBRA-FISH) showed that the rings were entirely composed of material from chromosome 12, and by further FISH analysis with locus-specific probes it was revealed that they consisted of two tandemly arranged copies of the segment 12p11.2-p13.2 to 12q21.2-q23.1. Within that segment of chromosome 12, there was a small deletion including the HMGA2 locus. There was no variation in ring size and no interphase bridges could be detected, indicating that the ring chromosomes were mitotically relatively stable. The present case thus adds support to the concept that there exists a subset of ALT with limited or minimal nuclear atypia and low-level amplification of 12q sequences, further suggesting the possibility of a molecular genetic continuum between lipoma and classical examples of ALT. Furthermore, the present data strongly imply that it is the composition of the rings rather than the ring chromosome formation as such that causes the genetic instability and nuclear atypia frequently seen in ALTs.

  14. Minutes of Midyear Executive Board Meeting.

    Science.gov (United States)

    Counseling Psychologist, 1994

    1994-01-01

    Presents minutes of midyear executive board meeting of American Psychological Association's Division 17, Counseling Psychology. Reviews standing committee reports from education and training, ethics and cultural diversity, hospitality suite, independent practice, membership, nominations, professional affairs, program committee, scientific affairs,…

  15. The Parkland 12-Minute Checklist Tracheotomy.

    Science.gov (United States)

    Panchal, Neeraj; Zide, Michael

    2016-03-01

    To validate the surgical time and propose a new checklist or algorithm to execute a tracheotomy within 12 minutes with optimal outcomes. The authors designed and implemented a checklist method for tracheotomy based on 6 consecutive patients with respiratory failure and prolonged intubation in a medical intensive care unit. The primary outcome variable was surgical time for a tracheotomy performed by a fifth- or sixth-year resident under the supervision of the senior author (M.Z.). Six consecutive patients undergoing tracheotomy (mean, 48 yr; range, 24 to 55 yr; 4 men and 2 women) were included in the study. The average time recorded from the incision to correct insertion of the tracheotomy tube and confirmation of carbon dioxide return by the anesthesiologist was 10.66 minutes (range, 8 to 12 minutes). This checklist facilitates the execution of a time-efficient and safe tracheotomy in less than 12 minutes. Copyright © 2016 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.

  16. Grammar success in 20 minutes a day

    CERN Document Server

    Express, Learning

    2013-01-01

    Thorough and concise, Grammar Success in 20 Minutes a Day, covers all the essentials, including common and proper nouns; personal, reflexive, and demonstrative pronouns; regular and irregular verbs; adjectives, adverbs, misplaced modifiers, prepositions, subordinate and insubordinate clauses; coordinating and correlating conjunctions; compound sentences; and punctuation.

  17. Influence analysis of cleft type and supernumerary teeth eruption in the prognosis of bone graft in patients with cleft palate.

    Science.gov (United States)

    Gaujac, Cristiano; de Souza Faco, Eduardo Francisco; Shinohara, Elio Hitoshi; de Souza Faco, Renato Andre; Pereira, Flávia Priscila; Assunção, Wirley Gonçalves

    2014-09-01

    The aim of this study was to investigate the influence of cleft type and supernumerary tooth eruption on the treatment of palatal clefts with alveolar bone grafts. In this article, medical records of 40 patients with palatal clefts and associated supernumerary teeth who were treated with alveolar bone grafting in the Hospital for Craniofacial Anomalies Rehabilitation were assessed. The patients were studied to assess the influence of supernumerary teeth and the cleft severity on the prognosis of the alveolar bone graft. Forty medical records were included in the assessment. When the teeth in the cleft had an anatomic shape close to canine, we called them precanine. When they were very small or malformed, we called them anomalous lateral incisors. The teeth studied showed good prognoses and were more expressive in the preforaminal clefts (87.5%) than in the transforaminal ones (62.5%). Moreover, the transforaminal clefts presented a higher percentage in satisfactory and poor prognoses (37.5%). The authors found that supernumerary teeth influenced the maintenance of alveolar bone graft height and that transforaminal clefts presented a worse prognosis than preforaminal clefts.

  18. Study of the frequency, localisation and morphology of supernumerary teeth in 1960 Spanish non-syndromic paediatric patients.

    Science.gov (United States)

    Ferrés-Amat, E; Maura-Solivellas, I; Prats-Armengol, J; Ferrés-Amat, E; Mareque-Bueno, J; Ferrés-Padró, E

    2015-03-01

    The main objective was to study supernumerary teeth diagnosed during the routine checkups at the Paediatric Dentistry Service of Hospital de Nens, Barcelona (Spain), for four months. A transversal, descriptive study, was performed in 1,960 patients, aged 1 to 17 years, visited during routine oral checkups. An intraoral exploration (with intraoral mirror and probe) was performed to all patients, and subjects older than 5 years also underwent panoramic x-ray examination. A total of 33 patients showed supernumerary teeth (1.68%), 22 boys and 11 girls. A total of 10 patients (8 boys/2 girls) had supernumerary teeth in the temporary dentition, 20 patients (12 boys/8 girls) in the permanent dentition and 3 patients (2 boys/1girls) in both temporary and permanent dentition. A total of 46 supernumerary teeth were diagnosed. Any alteration in the number of teeth in patients younger than 5 years are difficult to diagnose, as x-rays are usually not taken. We believe that starting at 5 years old, a radiological exploration (panoramic x-ray) has to be carried out as a complement to the clinical examination.

  19. Minute Temperature Fluctuations Detected in Eta Bootis

    Science.gov (United States)

    1994-11-01

    A group of astronomers from the Aarhus University (Denmark) and the European Southern Observatory (2) have for the first time succeeded in detecting solar-type oscillations in another star. They observed the temperature of the bright northern star Eta Bootis during six nights with the 2.5-metre Nordic Optical Telescope at the Roque de los Muchachos observatory on the island of La Palma (Canary Islands) and were able to show that it varies periodically by a few hundredths of a degree. These changes are caused by pressure waves in the star and are directly dependent on its inner structure. A detailed analysis by the astronomers has shown that the observed effects are in good agreement with current stellar models. This is a most important, independent test of stellar theory. The Sun is an Oscillating Star About twenty years ago, it was discovered that the nearest star, our Sun, oscillates like the ringing of a bell with a period of about 5 minutes. The same phenomenon is known in the Earth, which begins to vibrate after earthquakes; in this way seismologists have been able to discern a layered structure in the Earth's interior. The recent impacts of a comet on Jupiter most likely had a similar effect on that planet. The observed solar oscillations concern the entire gaseous body of the Sun, but we can of course only observe them on its surface. It has been found that each mode moves the surface up and down by less than 25 metres; the combined motion is very complicated, because there are many different, simultaneous modes, each of which has a slightly different period. The exact values of these periods are sensitive to the speed of sound in the Sun's interior, which in turn depends on the density of the material there. Thus, by measuring the periods of solar oscillations, we may probe the internal structure of the Sun, that is otherwise inaccessible to observations. Why does the Sun oscillate and what is the cause of these oscillations ? We do not know yet, but it is

  20. Experiences of supernumerary status and the hidden curriculum in nursing: a new twist in the theory-practice gap?

    Science.gov (United States)

    Allan, Helen T; Smith, Pam; O'Driscoll, Mike

    2011-03-01

    This paper aims to increase our understanding about how student nurses' experiences of supernumerary status are embedded in the hidden curriculum in clinical practice and contribute to the theory-practice gap in nursing. Current literature suggests that the hidden curriculum exists in many professional curricula and that it functions to socialise students into professional behaviours and practice. However, in nursing, there is a gap in our understanding of how these socialisation processes have been influenced by supernumerary status and what forms the hidden curriculum might take currently in clinical practice. An ethnographic case study design. Data were collected in four sites using fieldwork in clinical practice as well as interviews with students, mentors and key stakeholders, an online survey of student bodies and curriculum analysis in four universities. The findings in this paper are drawn from the qualitative fieldwork and interviews and were analysed thematically. The findings suggest that supernumerary status is an important aspect of the hidden curriculum in clinical learning for nursing students; that students are expected by trained staff to work while they learn and that on registration, they are expected to be competent to work immediately as registered nurses. These expectations are at odds with those of academic nurses and contribute to a theory-practice gap for student nurses. These expectations form part of the hidden curriculum that shapes the clinical context, and students have to learn to negotiate their status as supernumerary students in practice to meet these expectations. Consequently, students have to learn in a disintegrated learning context where opposing values of learning exist. To reintegrate student nurses' learning, educators in universities and clinical practice have to understand how the hidden curriculum and expectations around supernumerary status among trained staff affect learning for students. © 2011 Blackwell Publishing

  1. Groups, rings, modules

    CERN Document Server

    Auslander, Maurice

    2014-01-01

    This classic monograph is geared toward advanced undergraduates and graduate students. The treatment presupposes some familiarity with sets, groups, rings, and vector spaces. The four-part approach begins with examinations of sets and maps, monoids and groups, categories, and rings. The second part explores unique factorization domains, general module theory, semisimple rings and modules, and Artinian rings. Part three's topics include localization and tensor products, principal ideal domains, and applications of fundamental theorem. The fourth and final part covers algebraic field extensions

  2. Cytogenetic and molecular analysis of a ring (21) in a patient with partial trisomy 21 and megakaryocytic leukemia

    Energy Technology Data Exchange (ETDEWEB)

    Palmer, C.G.; Blouin, J.L.; Bull, M.J. [Indiana Univ. School of Medicine, Indianapolis, IN (United States)]|[Univ. of Geneva Medical School, Geneva (Switzerland)] [and others

    1995-07-17

    We describe a patient with an asymmetric double ring 21 in mosaic form, 45,XX,-21/46,X,-21,+r(21), who has limited manifestations of Down syndrome and who developed acute myelofibrosis and megakaryocytic leukemia (AMKL), FAB M7, a hematologic disorder particularly common in Down syndrome patients. In situ hybridization studies, gene dosage, and DNA polymorphism analysis showed that the ring chromosome carries a duplicated region which extends from D21S406 on the centromeric side and includes marker D21S3 on the telomeric side. FISH studies indicate two sizes of ring 21 in the patient. The origin of the supernumerary chromosome 21 in the proband was paternal; furthermore, the r(21) probably was formed postzygotically. Included in the duplicated segment are the candidate genes for leukemia AML-1, ETS, and ERG. The potential significance of disomic homozygosity of loci on 21q in M7 megakaryocytic leukemia is discussed. 35 refs., 6 figs., 6 tabs.

  3. The elements of grammar in 90 minutes

    CERN Document Server

    Hollander, Robert

    2011-01-01

    An eminent scholar explains the essentials of English grammar to those who never studied the basics as well as those who need a refresher course. Inspired by Strunk & White's classic The Elements of Style, this user-friendly guide focuses exclusively on grammar, explaining the individual parts of speech and their proper arrangement in sentence form. A modest investment of 90 minutes can provide readers of all ages with simple but important tools that will improve their communication skills. Dover (2011) original publication.

  4. Interagency Advanced Power Group meeting minutes

    Energy Technology Data Exchange (ETDEWEB)

    1991-01-01

    This document contains the minutes and viewgraphs from a meeting of military personnel on the subject of power generation and distribution systems for military applications. Topics include heating and cooling systems for standard shelters, SDIO power programs, solar dynamic space power systems, hybrid solar dynamic/ photovoltaic systems, pulsed power technology, high-{Tc} superconductors, and actuators and other electronic equipment for aerospace vehicles. Attendees represented the US Air Force, Army, Navy, and NASA. (GHH)

  5. Interagency Advanced Power Group meeting minutes

    Energy Technology Data Exchange (ETDEWEB)

    1991-12-31

    This document contains the minutes and viewgraphs from a meeting of military personnel on the subject of power generation and distribution systems for military applications. Topics include heating and cooling systems for standard shelters, SDIO power programs, solar dynamic space power systems, hybrid solar dynamic/ photovoltaic systems, pulsed power technology, high-{Tc} superconductors, and actuators and other electronic equipment for aerospace vehicles. Attendees represented the US Air Force, Army, Navy, and NASA. (GHH)

  6. Physics of quantum rings

    CERN Document Server

    Fomin, Vladimir M

    2013-01-01

    This book deals with a new class of materials, quantum rings. Innovative recent advances in experimental and theoretical physics of quantum rings are based on the most advanced state-of-the-art fabrication and characterization techniques as well as theoretical methods. The experimental efforts allow to obtain a new class of semiconductor quantum rings formed by capping self-organized quantum dots grown by molecular beam epitaxy. Novel optical and magnetic properties of quantum rings are associated with non-trivial topologies at the nanoscale. An adequate characterization of quantum rings is po

  7. Saturn's largest ring.

    Science.gov (United States)

    Verbiscer, Anne J; Skrutskie, Michael F; Hamilton, Douglas P

    2009-10-22

    Most planetary rings in the Solar System lie within a few radii of their host body, because at these distances gravitational accelerations inhibit satellite formation. The best known exceptions are Jupiter's gossamer rings and Saturn's E ring, broad sheets of dust that extend outward until they fade from view at five to ten planetary radii. Source satellites continuously supply the dust, which is subsequently lost in collisions or by radial transport. Here we report that Saturn has an enormous ring associated with its outer moon Phoebe, extending from at least 128R(S) to 207R(S) (Saturn's radius R(S) is 60,330 km). The ring's vertical thickness of 40R(S) matches the range of vertical motion of Phoebe along its orbit. Dynamical considerations argue that these ring particles span the Saturnian system from the main rings to the edges of interplanetary space. The ring's normal optical depth of approximately 2 x 10(-8) is comparable to that of Jupiter's faintest gossamer ring, although its particle number density is several hundred times smaller. Repeated impacts on Phoebe, from both interplanetary and circumplanetary particle populations, probably keep the ring populated with material. Ring particles smaller than centimetres in size slowly migrate inward and many of them ultimately strike the dark leading face of Iapetus.

  8. Supernumerary rainbows

    Science.gov (United States)

    Sawicki, Mikolaj; Sawicki, Pawel

    2000-01-01

    Late in the afternoon of July 19, 1999, we were able to photograph some very unusual rainbows in the sky over Boulder, Colorado. The picture here shows a primary rainbow, a fainter secondary bow above it, and several pastel-shaded rainbows inside the primary one. While we think we counted as many as four concurrent rainbows in that afternoon, only three of them show up in developed prints.

  9. Supernumerary eyes and man's search for hyper-vision: a historical review of relevant representational arts.

    Science.gov (United States)

    Diamandopoulou-Drummond, A H; Diamandopoulos, A A; Marketos, S G

    1993-10-01

    In this paper we present examples of man's identification of superiority with visual hyper-efficiency. From Babylonian, Egyptian, Minoan and Biblical times, the eye was the symbol of the master or the inspector. Similarly, a being or deity that was endowed with multiple eyes--with or without multiple heads--was considered to be extra powerful. An example is the crest of the British College of Optometrists, which is surmounted by a bird with three heads and hence supernumerary eyes, linking it to the College's motto 'aequis oculis videre' denoting equal vision. We present here photographic and textual data from several historical periods extending from the fourth millennium BC to the sixteenth century AD; and from different religious sources, both Christian and non-Christian, to support this thesis. However, these are only a few examples, selected from a larger on-going study of the subject.

  10. Atypical supernumerary phantom limb and phantom limb pain in two patients with pontine hemorrhage.

    Science.gov (United States)

    Yoo, Seung Don; Kim, Dong Hwan; Jeong, Yong Seol; Chon, Jinmann; Bark, Jihea

    2011-06-01

    Phantom limbs are usually observed after amputation of extremities. In patients after a stroke, a similar but rarely occurring phenomenon consisting of the patient experiencing the presence of an additional limb has been described. This phenomenon, generally called supernumerary phantom limb (SPL), may be caused by lesions in the right or left cerebral hemisphere, but has been predominantly reported in patients who have had a right hemispheric stroke. We report two cases of atypical SPL and phantom limb pain (PLP) after pontine hemorrhage. The patients were treated conservatively and their symptoms lasted more than 1 month. This is the first report of SPLs after left pontine hemorrhage, and phantom perception and pain lasted longer than those in previously observed cases. Our results indicate that SPL may be more common than reported; therefore, thorough examinations are essential for the care of stroke patients.

  11. Caries, Periodontal Disease, Supernumerary Teeth and Other Dental Disorders in Swedish Wild Boar (Sus scrofa).

    Science.gov (United States)

    Malmsten, A; Dalin, A-M; Pettersson, A

    2015-07-01

    Between January and December 2013, the dental and periodontal health of 99 Swedish wild boars (Sus scrofa) was investigated. Sampling occurred in conjunction with routine hunting at six large estates in the southern and middle parts of Sweden. All six of the estates use supplemental feeding. The weight of the animals, their sex and their dates of death were noted. Age was estimated using tooth eruption and tooth replacement patterns. The oral cavity was inspected and abnormalities were recorded on a dental chart modified for wild boars. The findings included supernumerary teeth, absence of teeth, mild class II malocclusion, severe tooth wear, periodontitis, calculus, caries, tooth fractures and the presence of enamel defects. Swedish wild boars suffer from different dental lesions and the impact of supplemental feeding on dental and periodontal health is still to be investigated. Copyright © 2015 Elsevier Ltd. All rights reserved.

  12. Cleidocranial dysplasia presenting with retained deciduous teeth and impacted permanent and supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Mahalakshmi Ikkanur Puttaranganaik

    2014-01-01

    Full Text Available Cleidocranial dysplasia is a disease that occurs secondary to a dominant autosomal inheritance. There is no predilection for any genre or ethnic group. As there is a delay in the eruption and/or absence of permanent teeth, the patients usually report to a dental surgeon for replacement of the missing teeth. This condition is characterized by several cranial malformations and underdevelopment, absence of clavicles, and multiple impacted supernumerary and permanent teeth. The diagnosis of the condition is usually based on the presence of the above-mentioned main features and on clinical and familial evidence. Here we report a rare case of cleidocranial dysplasia in a male patient, having most of the characteristic features of this syndrome.

  13. Paradental cyst associated with supernumerary tooth fused with third molar: A rare case report

    Science.gov (United States)

    Prakash, A Ravi; Reddy, P Sreenivas; Rajanikanth, M

    2012-01-01

    Fusion is the union of two tooth buds that are normally separated. Fusion is more frequent in deciduous teeth, particularly in the anterior region. The etiology of fusion is not known. It has been suggested that the pressure of adjacent dental follicles produces their contact and fusion before calcification. There is no difference between men and women in incidence. The term paradental cyst means that such type of cysts that are close proximity with the root of a tooth. A history of recurrent pericoronitis is reported usually and there is often the presence of a communication between the periodontal pocket and the cyst. We present a rare case report where in partially erupted mandibular third molar is fused horizontally with a supernumerary tooth with paradental cyst. PMID:22434950

  14. Inactivation of IL11 signaling causes craniosynostosis, delayed tooth eruption, and supernumerary teeth.

    Science.gov (United States)

    Nieminen, Pekka; Morgan, Neil V; Fenwick, Aimée L; Parmanen, Satu; Veistinen, Lotta; Mikkola, Marja L; van der Spek, Peter J; Giraud, Andrew; Judd, Louise; Arte, Sirpa; Brueton, Louise A; Wall, Steven A; Mathijssen, Irene M J; Maher, Eamonn R; Wilkie, Andrew O M; Kreiborg, Sven; Thesleff, Irma

    2011-07-15

    Craniosynostosis and supernumerary teeth most often occur as isolated developmental anomalies, but they are also separately manifested in several malformation syndromes. Here, we describe a human syndrome featuring craniosynostosis, maxillary hypoplasia, delayed tooth eruption, and supernumerary teeth. We performed homozygosity mapping in three unrelated consanguineous Pakistani families and localized the syndrome to a region in chromosome 9. Mutational analysis of candidate genes in the region revealed that all affected children harbored homozygous missense mutations (c.662C>G [p.Pro221Arg], c.734C>G [p.Ser245Cys], or c.886C>T [p.Arg296Trp]) in IL11RA (encoding interleukin 11 receptor, alpha) on chromosome 9p13.3. In addition, a homozygous nonsense mutation, c.475C>T (p.Gln159X), and a homozygous duplication, c.916_924dup (p.Thr306_Ser308dup), were observed in two north European families. In cell-transfection experiments, the p.Arg296Trp mutation rendered the receptor unable to mediate the IL11 signal, indicating that the mutation causes loss of IL11RA function. We also observed disturbed cranial growth and suture activity in the Il11ra null mutant mice, in which reduced size and remodeling of limb bones has been previously described. We conclude that IL11 signaling is essential for the normal development of craniofacial bones and teeth and that its function is to restrict suture fusion and tooth number. The results open up the possibility of modulation of IL11 signaling for the treatment of craniosynostosis. Copyright © 2011 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

  15. Inactivation of IL11 Signaling Causes Craniosynostosis, Delayed Tooth Eruption, and Supernumerary Teeth

    Science.gov (United States)

    Nieminen, Pekka; Morgan, Neil V.; Fenwick, Aimée L.; Parmanen, Satu; Veistinen, Lotta; Mikkola, Marja L.; van der Spek, Peter J.; Giraud, Andrew; Judd, Louise; Arte, Sirpa; Brueton, Louise A.; Wall, Steven A.; Mathijssen, Irene M.J.; Maher, Eamonn R.; Wilkie, Andrew O.M.; Kreiborg, Sven; Thesleff, Irma

    2011-01-01

    Craniosynostosis and supernumerary teeth most often occur as isolated developmental anomalies, but they are also separately manifested in several malformation syndromes. Here, we describe a human syndrome featuring craniosynostosis, maxillary hypoplasia, delayed tooth eruption, and supernumerary teeth. We performed homozygosity mapping in three unrelated consanguineous Pakistani families and localized the syndrome to a region in chromosome 9. Mutational analysis of candidate genes in the region revealed that all affected children harbored homozygous missense mutations (c.662C>G [p.Pro221Arg], c.734C>G [p.Ser245Cys], or c.886C>T [p.Arg296Trp]) in IL11RA (encoding interleukin 11 receptor, alpha) on chromosome 9p13.3. In addition, a homozygous nonsense mutation, c.475C>T (p.Gln159X), and a homozygous duplication, c.916_924dup (p.Thr306_Ser308dup), were observed in two north European families. In cell-transfection experiments, the p.Arg296Trp mutation rendered the receptor unable to mediate the IL11 signal, indicating that the mutation causes loss of IL11RA function. We also observed disturbed cranial growth and suture activity in the Il11ra null mutant mice, in which reduced size and remodeling of limb bones has been previously described. We conclude that IL11 signaling is essential for the normal development of craniofacial bones and teeth and that its function is to restrict suture fusion and tooth number. The results open up the possibility of modulation of IL11 signaling for the treatment of craniosynostosis. PMID:21741611

  16. Supernumerary and absent limbs and digits of the lower limb: a review of the literature.

    Science.gov (United States)

    Klaassen, Zachary; Shoja, Mohammadali M; Tubbs, R Shane; Loukas, Marios

    2011-07-01

    Anatomical history over centuries includes description of a wide variety of malformations involving the lower limbs. This article offers an organized review of these diverse abnormalities, including new understanding of mechanisms through recent discoveries in genetics and molecular biology. In 19th century Europe, a number of unique anomalies were reported, as well as evidence of foot amputations occurring in ancient Peruvian culture. Embryologically, the limbs develop early, with the lower limb being recognizable for the first time at stage 13 of development. By stage 23, the toes are clearly defined and by birth, although the legs appear bowed, the tibia and fibula are straight. Removal of the apical ectodermal ridge results in cessation of limb development, conversely, a second apical ectodermal ridge results in duplication of distal structures. Supernumerary limbs have been documented to occur as part of a teratoma with unique morphology and accompanying blood supply. Additionally, many examples of polydactyly occur in the foot postulating that deletion of chromosome 22q11 is involved in postaxial polydactyly. Such deletions occur near the middle of the chromosome at a location designated q11.2 (i.e., on the long arm of one of the pair of chromosomes 22) and this syndrome is also referred to as DiGeorge syndrome, which has a prevalence estimated at 1:4,000. Absence of the lower limbs has also been noted, with hypoplasia of the fibula being the most common manifestation of congenital bone absences in the lower limb. In addition to fibular aplasia, cases of tibial aplasia have been reported. This article is important for surgeons attempting correctional repair of lower limb anomalies, as well as providing analysis of the historical, anatomical and clinical aspects of supernumerary and absent limbs and digits for the lower limb. Copyright © 2011 Wiley-Liss, Inc.

  17. Ring extension of entire ring with conjugation; arithmetic in entire rings

    OpenAIRE

    Laugier, Alexandre

    2013-01-01

    Some basic properties of the ring of integers $\\mathbb{Z}$ are extended to entire rings. In particular, arithmetic in entire principal rings is very similar than arithmetic in the ring of integers $\\mathbb{Z}$. These arithmetic properties are derived from a $\\star$-ring extension of the considered entire ring (ring extension with conjugation) equipped with a real function which is a multiplicative structure-preserving map between two algebras. The algebra of this ring extension is studied in ...

  18. Token Ring Project

    Directory of Open Access Journals (Sweden)

    Adela Ionescu

    2007-01-01

    Full Text Available Ring topology is a simple configuration used to connect processes that communicate among themselves. A number of network standards such as token ring, token bus, and FDDI are based on the ring connectivity. This article will develop an implementation of a ring of processes that communicate among themselves via pipe links. The processes are nodes in the ring. Each process reads from its standard input and writes in its standard output. N-1 process redirects the its standard output to a standard input of the process through a pipe. When the ring-structure is designed, the project can be extended to simulate networks or to implement algorithms for mutual exclusion

  19. Token ring technology report

    CERN Document Server

    2013-01-01

    Please note this is a Short Discount publication. This report provides an overview of the IBM Token-Ring technology and products built by IBM and compatible vendors. It consists of two sections: 1. A summary of the design trade-offs for the IBM Token-Ring. 2. A summary of the products of the major token-ring compatible vendors broken down by adapters and components, wiring systems, testing, and new chip technology.

  20. Ordered Rings and Fields

    Directory of Open Access Journals (Sweden)

    Schwarzweller Christoph

    2017-03-01

    Full Text Available We introduce ordered rings and fields following Artin-Schreier’s approach using positive cones. We show that such orderings coincide with total order relations and give examples of ordered (and non ordered rings and fields. In particular we show that polynomial rings can be ordered in (at least two different ways [8, 5, 4, 9]. This is the continuation of the development of algebraic hierarchy in Mizar [2, 3].

  1. Radioactive gold ring dermatitis

    Energy Technology Data Exchange (ETDEWEB)

    Miller, R.A.; Aldrich, J.E. (Dalhousie Univ., Halifax, Nova Scotia (Canada))

    1990-08-01

    A superficial squamous cell carcinoma developed in a woman who wore a radioactive gold ring for more than 30 years. Only part of the ring was radioactive. Radiation dose measurements indicated that the dose to basal skin layer was 2.4 Gy (240 rad) per week. If it is assumed that the woman continually wore her wedding ring for 37 years since purchase, she would have received a maximum dose of approximately 4600 Gy.

  2. Comparison of walking performance over the first 2 minutes and the full 6 minutes of the Six-Minute Walk Test.

    Science.gov (United States)

    Bohannon, Richard W; Bubela, Deborah; Magasi, Susan; McCreath, Heather; Wang, Ying-Chih; Reuben, David; Rymer, William Z; Gershon, Richard

    2014-04-25

    Although the Six-Minute Walk Test (6MWT), as recommended by the American Thoracic Society, is widely used as a measure of functional endurance, it may not be applicable in some settings and populations. We sought to examine, therefore, performance over the first 2 minutes and the full 6 minutes of the 6MWT. Specifically, we investigated completion rates, distances walked, test-retest reliability, and the relationship between distances walked over the first 2 and the full 6 minutes of the 6MWT. Community-dwelling children and adults age 3-85 years (n = 337) were asked to walk back and forth on a 15.24 meter (50 ft) course as far as possible without running over a 6 minute period. Test completion and the distance covered by the participants at 2 and 6 minutes were documented. The reliability of distances covered at 2 and 6 minutes was determined by retesting a subsample of 54 participants 6 to 10 days later. The relationship between distances covered at 2 and 6 minutes was determined for the 330 participants completing the 6MWT. All 337 participants completed at least 2 minutes of walking, but 7 children less than 5 years of age ceased walking before 6 minutes had elapsed. For the remaining 330 participants the mean distance walked was 186 meters at 2 minutes and 543 meters at 6 minutes. The distances covered at 2 and 6 minutes were reliable between sessions (intraclass correlation coefficients = 0.888 and 0.917, respectively). The distances covered over 2 and 6 minutes were highly correlated (r = 0.968). The completion rate, values obtained, test-retest reliability, and relationship of the distances walked in 2 and 6 minutes support documentation of 2 minute distance during the 6MWT. The findings also provide support for use of a Two-Minute Walk Test as the endurance component in the Motor Battery of the NIH Toolbox.

  3. Sarjeev′s supernumerary tooth notation system: A universally compatible add-on to the Two-Digit system

    Directory of Open Access Journals (Sweden)

    Sarjeev Singh Yadav

    2013-01-01

    Full Text Available Aim: To give notation for quadrants, tooth position, and the type of supernumerary teeth for both permanent and deciduous dentition. Tooth numbering provides dentists with an essential shortcut in clinical record keeping. Materials and Methods: Three systems are favored worldwide: the Zsigmondy/Palmer system, the Universal system, and the Federation Dentaire Internationale (FDI Two-Digit system. Histories of all tooth-numbering methods were traced and the strengths and deficiencies of each system were reviewed. The FDI Two-Digit system is widely used throughout the world, except USA, and is the only method that makes the visual sense, cognitive sense, and computer sense. Conclusion: On review it was noticed that all tooth notation systems in vogue have a drawback as they do not provide any information or notations for supernumerary teeth such as paramolar, distomolar, mesiodens, and fused teeth.

  4. Autotransplantation of a Supernumerary Tooth to Replace a Misaligned Incisor with Abnormal Dimensions and Morphology: 2-Year Follow-Up

    Directory of Open Access Journals (Sweden)

    R. Ebru Tirali

    2013-01-01

    Full Text Available Autotransplantation is a viable treatment option to restore esthetics and function impaired by abnormally shaped teeth when a suitable donors tooth is available. This paper describes the autotransplantation and 2-year follow-up of a supernumerary maxillary incisor as a replacement to a misaligned maxillary incisor with abnormal crown morphology and size. The supernumerary incisor was immediately autotransplanted into the extraction site of the large incisor and was stabilized with a bonded semirigid splint for 2 weeks. Fixed orthodontic therapy was initiated 3 months after autotransplantation. Ideal alignment of the incisors was accomplished after 6 months along with radiographic evidence of apical closure and osseous/periodontal regeneration. In autogenous tooth transplantation, a successful clinical outcome can be achieved if the cases are selected and treated properly.

  5. Adjacent dentigerous cysts with the ectopic displacement of a third mandibular molar and supernumerary (forth) molar: a rare occurrence.

    Science.gov (United States)

    McCrea, Shane

    2009-06-01

    Dentigerous cysts are the most common odontological cysts of the jaws, being associated with the crowns of permanent teeth, especially unerupted mandibular third molars. Multiple dentigerous cysts are rare and most often occur in association with a developmental syndrome. This article presents an unusual case of nonsyndromic adjacent dentigerous cysts associated with a mandibular third molar and a supernumerary molar. This occurrence has not been previously reported.

  6. Origin of B chromosomes in Characidium alipioi (Characiformes, Crenuchidae) and its relationship with supernumerary chromosomes in other Characidium species

    OpenAIRE

    Freitas,Érica; Utsunomia,Ricardo; Sobrinho-Scudeler,Patrícia; Oliveira,Claudio; Foresti,Fausto

    2017-01-01

    Abstract B chromosomes are apparently dispensable components found in the genomes of many species that are mainly composed of repetitive DNA sequences. Among the numerous questions concerning B chromosomes, the origin of these elements has been widely studied. To date, supernumerary chromosomes have been identified in approximately 60 species of fish, including species of the genus Characidium Reinhardt, 1867 in which these elements appear to have independently originated. In this study, we u...

  7. The LHC restart in one minute

    CERN Multimedia

    2016-01-01

    On Friday March 25 2016, the Large Hadron Collider (LHC) got its first proton beam of the year. In just over 1 minute this time-lapse provides a quick overview to some of the important milestones that preceded proton beam injection this year, against a background of activities over the last few days in the CERN Control Centre (CCC), the place where the CERN accelerator chain is operated and controlled. Read more: http://cern.ch/go/Z9cz Music From FruityAudio, entitled "New Groove". - Producer - Audiovisual production service Paola Catapano - Director - Julien Ordan - Camera - Julien Ordan Maximilien Brice - Graphics \\ Animations - Arzur Catel Torres - Infography - Daniel Dominguez Noemi Caraban - Music - FruityAudio - New groove Category Film & Animation License Standard YouTube License

  8. Minutes of the Sixth CEOS Plenary Meeting

    Science.gov (United States)

    1993-01-01

    The Committee on Earth Observations Satellites (CEOS) minutes for the sixth plenary meeting held in London, December 9-11, 1992 are presented. Attending as prospective members were the Russian Space Agency (RSA), the Committee for Hydrometeorology and Environmental Monitoring of the Ministry for Ecology and Natural resources of the Russian Federation (ROSCOMGIDROMET), the Chinese Academy of Space Technology (CAST) and the National Remote Sensing Center of China (NRSCC). Actions taken at the meeting included membership issues, CEOS proposals, data policy, and working group reports. Data requirements of CEOS affiliates were also reported on. Additional summations and statements as well as lists of participants and future meetings are included. In general, topics covered related to remote sensing and global change.

  9. The cryogenic storage ring CSR

    Energy Technology Data Exchange (ETDEWEB)

    Hahn, R. von; Becker, A.; Berg, F.; Blaum, K.; Fadil, H.; Fellenberger, F.; Froese, M.; George, S.; Göck, J.; Grieser, M.; Grussie, F.; Guerin, E. A.; Herwig, P.; Karthein, J.; Krantz, C.; Kreckel, H.; Lange, M.; Laux, F.; Lohmann, S.; Menk, S. [Max-Planck-Institut für Kernphysik, 69117 Heidelberg (Germany); and others

    2016-06-15

    An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed, and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 ± 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion), and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm{sup −3} is derived, equivalent to a room-temperature pressure below 10{sup −14} mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams.

  10. The Cryogenic Storage Ring CSR

    CERN Document Server

    von Hahn, Robert; Berg, Felix; Blaum, Klaus; Breitenfeldt, Christian; Fadil, Hisham; Fellenberger, Florian; Froese, Michael; George, Sebastian; Göck, Jürgen; Grieser, Manfred; Grussie, Florian; Guerin, Elisabeth A; Heber, Oded; Herwig, Philipp; Karthein, Jonas; Krantz, Claude; Kreckel, Holger; Lange, Michael; Laux, Felix; Lohmann, Svenja; Menk, Sebastian; Meyer, Christian; Mishra, Preeti M; Novotný, Oldřich; Connor, Aodh P O; Orlov, Dmitry A; Rappaport, Michael L; Repnow, Roland; Saurabh, Sunny; Schippers, Stefan; Schröter, Claus Dieter; Schwalm, Dirk; Schweikhard, Lutz; Sieber, Thomas; Shornikov, Andrey; Spruck, Kaija; Kumar, Sudhakaran Sunil; Ullrich, Joachim; Urbain, Xavier; Vogel, Stephen; Wilhelm, Patrick; Wolf, Andreas; Zajfman, Daniel

    2016-01-01

    An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 $\\pm$ 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion) and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas den...

  11. The cryogenic storage ring CSR

    Science.gov (United States)

    von Hahn, R.; Becker, A.; Berg, F.; Blaum, K.; Breitenfeldt, C.; Fadil, H.; Fellenberger, F.; Froese, M.; George, S.; Göck, J.; Grieser, M.; Grussie, F.; Guerin, E. A.; Heber, O.; Herwig, P.; Karthein, J.; Krantz, C.; Kreckel, H.; Lange, M.; Laux, F.; Lohmann, S.; Menk, S.; Meyer, C.; Mishra, P. M.; Novotný, O.; O'Connor, A. P.; Orlov, D. A.; Rappaport, M. L.; Repnow, R.; Saurabh, S.; Schippers, S.; Schröter, C. D.; Schwalm, D.; Schweikhard, L.; Sieber, T.; Shornikov, A.; Spruck, K.; Sunil Kumar, S.; Ullrich, J.; Urbain, X.; Vogel, S.; Wilhelm, P.; Wolf, A.; Zajfman, D.

    2016-06-01

    An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed, and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 ± 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion), and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm-3 is derived, equivalent to a room-temperature pressure below 10-14 mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams.

  12. "Take ten minutes": a dedicated ten minute medication review reduces polypharmacy in the elderly.

    LENUS (Irish Health Repository)

    Walsh, E K

    2010-09-01

    Multiple and inappropriate medications are often the cause for poor health status in the elderly. Medication reviews can improve prescribing. This study aimed to determine if a ten minute medication review by a general practitioner could reduce polypharmacy and inappropriate prescribing in elderly patients. A prospective, randomised study was conducted. Patients over the age of 65 (n = 50) underwent a 10-minute medication review. Inappropriate medications, dosage errors, and discrepancies between prescribed versus actual medication being consumed were recorded. A questionnaire to assess satisfaction was completed following review. The mean number of medications taken by patients was reduced (p < 0.001). A medication was stopped in 35 (70%) patients. Inappropriate medications were detected in 27 (54%) patients and reduced (p < 0.001). Dose errors were detected in 16 (32%). A high level of patient satisfaction was reported. A ten minute medication review reduces polypharmacy, improves prescribing and is associated with high levels of patient satisfaction.

  13. "Take ten minutes": a dedicated ten minute medication review reduces polypharmacy in the elderly.

    LENUS (Irish Health Repository)

    Walsh, E K

    2012-02-01

    Multiple and inappropriate medications are often the cause for poor health status in the elderly. Medication reviews can improve prescribing. This study aimed to determine if a ten minute medication review by a general practitioner could reduce polypharmacy and inappropriate prescribing in elderly patients. A prospective, randomised study was conducted. Patients over the age of 65 (n = 50) underwent a 10-minute medication review. Inappropriate medications, dosage errors, and discrepancies between prescribed versus actual medication being consumed were recorded. A questionnaire to assess satisfaction was completed following review. The mean number of medications taken by patients was reduced (p < 0.001). A medication was stopped in 35 (70%) patients. Inappropriate medications were detected in 27 (54%) patients and reduced (p < 0.001). Dose errors were detected in 16 (32%). A high level of patient satisfaction was reported. A ten minute medication review reduces polypharmacy, improves prescribing and is associated with high levels of patient satisfaction.

  14. Saturn's dynamic D ring

    Science.gov (United States)

    Hedman, M.M.; Burns, J.A.; Showalter, M.R.; Porco, C.C.; Nicholson, P.D.; Bosh, A.S.; Tiscareno, M.S.; Brown, R.H.; Buratti, B.J.; Baines, K.H.; Clark, R.

    2007-01-01

    The Cassini spacecraft has provided the first clear images of the D ring since the Voyager missions. These observations show that the structure of the D ring has undergone significant changes over the last 25 years. The brightest of the three ringlets seen in the Voyager images (named D72), has transformed from a narrow, ring. Cassini also finds that the locations of other narrow features in the D ring and the structure of the diffuse material in the D ring differ from those measured by Voyager. Furthermore, Cassini has detected additional ringlets and structures in the D ring that were not observed by Voyager. These include a sheet of material just interior to the inner edge of the C ring that is only observable at phase angles below about 60??. New photometric and spectroscopic data from the ISS (Imaging Science Subsystem) and VIMS (Visual and Infrared Mapping Spectrometer) instruments onboard Cassini show the D ring contains a variety of different particle populations with typical particle sizes ranging from 1 to 100 microns. High-resolution images reveal fine-scale structures in the D ring that appear to be variable in time and/or longitude. Particularly interesting is a remarkably regular, periodic structure with a wavelength of ??? 30 ?? km extending between orbital radii of 73,200 and 74,000 km. A similar structure was previously observed in 1995 during the occultation of the star GSC5249-01240, at which time it had a wavelength of ??? 60 ?? km. We interpret this structure as a periodic vertical corrugation in the D ring produced by differential nodal regression of an initially inclined ring. We speculate that this structure may have formed in response to an impact with a comet or meteoroid in early 1984. ?? 2006 Elsevier Inc. All rights reserved.

  15. Algorithms for finite rings

    NARCIS (Netherlands)

    Ciocanea Teodorescu I.,

    2016-01-01

    In this thesis we are interested in describing algorithms that answer questions arising in ring and module theory. Our focus is on deterministic polynomial-time algorithms and rings and modules that are finite. The first main result of this thesis is a solution to the module isomorphism problem in

  16. Relativistic ring models

    Energy Technology Data Exchange (ETDEWEB)

    Ujevic, Maximiliano [Universidade Federal do ABC (UFABC), Santo Andre, SP (Brazil). Centro de Ciencias Naturais e Humanas; Letelier, Patricio S.; Vogt, Daniel [Universidade Estadual de Campinas (UNICAMP), SP (Brazil). Inst. de Matematica, Estatistica e Computacao Cientifica. Dept. de Matematica Aplicada

    2011-07-01

    Full text: Relativistic thick ring models are constructed using previously found analytical Newtonian potential-density pairs for flat rings and toroidal structures obtained from Kuzmin-Toomre family of discs. This was achieved by inflating previously constructed Newtonian ring potentials using the transformation |z|{yields}{radical}z{sup 2} + b{sup 2}, and then finding their relativistic analog. The models presented have infinite extension but the physical quantities decays very fast with the distance, and in principle, one could make a cut-off radius to consider it finite. In particular, we present systems with one ring, two rings and a disc with a ring. Also, the circular velocity of a test particle and its stability when performing circular orbits are presented in all these models. Using the Rayleigh criterion of stability of a fluid at rest in a gravitational field, we find that the different systems studied present a region of non-stability that appears in the intersection of the disc and the ring, and between the rings when they become thinner. (author)

  17. EBT ring physics

    Energy Technology Data Exchange (ETDEWEB)

    Uckan, N.A. (ed.)

    1980-04-01

    This workshop attempted to evaluate the status of the current experimental and theoretical understanding of hot electron ring properties. The dominant physical processes that influence ring formation, scaling, and their optimal behavior are also studied. Separate abstracts were prepared for each of the 27 included papers. (MOW)

  18. Illustration of Saturn's Rings

    Science.gov (United States)

    2001-01-01

    This illustration shows a close-up of Saturn's rings. These rings are thought to have formed from material that was unable to form into a Moon because of tidal forces from Saturn, or from a Moon that was broken up by Saturn's tidal forces.

  19. Smoke Ring Physics

    Science.gov (United States)

    Huggins, Elisha

    2011-01-01

    The behavior of smoke rings, tornados, and quantized vortex rings in superfluid helium has many features in common. These features can be described by the same mathematics we use when introducing Ampere's law in an introductory physics course. We discuss these common features. (Contains 7 figures.)

  20. Imaging rings in ring imaging Cherenkov counters

    Energy Technology Data Exchange (ETDEWEB)

    Ratcliff, Blair N

    2002-11-25

    The general concepts used to form images in Ring Imaging Cherenkov (RICH) counters are described and their performance properties compared. Particular attention is paid to issues associated with imaging in the time dimension, especially in Detectors of Internally Reflected Cherenkov light (DIRCs).

  1. Rings and their modules

    CERN Document Server

    Bland, Paul E

    2011-01-01

    This book is an introduction to the theory of rings and modules that goes beyond what one normally obtains in a graduate course in abstract algebra. In addition to the presentation of standard topics in ring and module theory, it also covers category theory, homological algebra and even more specialized topics like injective envelopes and projective covers, reflexive modules and quasi-Frobenius rings, and graded rings and modules. The book is a self-contained volume written in a very systematic style: allproofs are clear and easy for the reader to understand and allarguments are based onmaterials contained in the book. A problem sets follow each section. It is suitable for graduate and PhD students who have chosen ring theory for their research subject.

  2. Ownership and Agency of an Independent Supernumerary Hand Induced by an Imitation Brain-Computer Interface.

    Science.gov (United States)

    Bashford, Luke; Mehring, Carsten

    2016-01-01

    To study body ownership and control, illusions that elicit these feelings in non-body objects are widely used. Classically introduced with the Rubber Hand Illusion, these illusions have been replicated more recently in virtual reality and by using brain-computer interfaces. Traditionally these illusions investigate the replacement of a body part by an artificial counterpart, however as brain-computer interface research develops it offers us the possibility to explore the case where non-body objects are controlled in addition to movements of our own limbs. Therefore we propose a new illusion designed to test the feeling of ownership and control of an independent supernumerary hand. Subjects are under the impression they control a virtual reality hand via a brain-computer interface, but in reality there is no causal connection between brain activity and virtual hand movement but correct movements are observed with 80% probability. These imitation brain-computer interface trials are interspersed with movements in both the subjects' real hands, which are in view throughout the experiment. We show that subjects develop strong feelings of ownership and control over the third hand, despite only receiving visual feedback with no causal link to the actual brain signals. Our illusion is crucially different from previously reported studies as we demonstrate independent ownership and control of the third hand without loss of ownership in the real hands.

  3. Beyond the big five: the Dark Triad and the supernumerary personality inventory.

    Science.gov (United States)

    Veselka, Livia; Schermer, Julie Aitken; Vernon, Philip A

    2011-04-01

    The Dark Triad of personality, comprising Machiavellianism, narcissism, and psychopathy, was investigated in relation to the Supernumerary Personality Inventory (SPI) traits, because both sets of variables are predominantly distinct from the Big Five model of personality. Correlational and principal factor analyses were conducted to assess the relations between the Dark Triad and SPI traits. Multivariate behavioral genetic model-fitting analyses were also conducted to determine the correlated genetic and/or environmental underpinnings of the observed phenotypic correlations. Participants were 358 monozygotic and 98 same-sex dizygotic adult twin pairs from North America. As predicted, results revealed significant correlations between the Dark Triad and most SPI traits, and these correlations were primarily attributable to common genetic and non-shared environmental factors, except in the case of Machiavellianism, where shared environmental effects emerged. Three correlated factors were extracted during joint factor analysis of the Dark Triad and SPI traits, as well as a heritable general factor of personality - results that clarified the structure of the Dark Triad construct. It is concluded that the Dark Triad represents an exploitative and antisocial construct that extends beyond the Big Five model and shares a theoretical space with the SPI traits.

  4. Reliability of horizontal and vertical tube shift techniques in the localisation of supernumerary teeth.

    Science.gov (United States)

    Mallineni, S K; Anthonappa, R P; King, N M

    2016-12-01

    To assess the reliability of the vertical tube shift technique (VTST) and horizontal tube shift technique (HTST) for the localisation of unerupted supernumerary teeth (ST) in the anterior region of the maxilla. A convenience sample of 83 patients who attended a major teaching hospital because of unerupted ST was selected. Only non-syndromic patients with ST and who had complete clinical and radiographic and surgical records were included in the study. Ten examiners independently rated the paired set of radiographs for each technique. Chi-square test, paired t test and kappa statistics were employed to assess the intra- and inter-examiner reliability. Paired sets of 1660 radiographs (830 pairs for each technique) were available for the analysis. The overall sensitivity for VTST and HTST was 80.6 and 72.1% respectively, with slight inter-examiner and good intra-examiner reliability. Statistically significant differences were evident between the two localisation techniques (p < 0.05). Localisation of unerupted ST using VTST was more successful than HTST in the anterior region of the maxilla.

  5. Multiple, supernumerary retained teeth in the course of cleido-cranial dysplasia. A case report.

    Science.gov (United States)

    Lewandowski, Bogumił; Martula-Gala, Katarzyna; Brodowski, Robert; Zych, Barbara

    2015-01-01

    Cleido-cranial dysplasia, often referred to as Scheuthauer-Marie-Sainton syndrome, is an autosomal dominant disorder of the musculo-skeletal system. Patients with cleido-cranial dysplasia are characterized by short stature, frequent varus or valgus hip, kyphoscoliosis, underdevelopment of the scapulas and the sternum, incorrect number of ribs. The most characteristic feature is unilateral or bilateral, partial or total underdevelopment of clavicles. Mental development is not affected in this syndrome. Malocclusion, occlusal irregularities, multiple supernumerary teeth, impacted teeth, and persistent milk teeth are found in the stomatognathic system. Teeth often have abnormal anatomy. Gothic palate, cleft hard and soft palate are diagnosed. The aim of this paper is to present a case of a 12-year-old boy diagnosed with irregularities in the masticatory system involving an additional number of retained teeth. The boy was referred by an orthodontist for surgical and orthodontic team therapy. The case presented confirms the observations of other authors that only the multi-specialty collaboration of a pediatrician, a geneticist, an orthopedist, an orthodontist, a maxillofacial surgeon, an implant prosthetic surgeon and a physiotherapist can provide proper diagnosis and treatment.

  6. Association between maxillary anterior supernumerary teeth and impacted incisors in mixed dentition.

    Science.gov (United States)

    He, Dongmei; Mei, Li; Wang, Yan; Li, Jialing; Li, Huang

    2017-08-01

    Few researchers have investigated the relationship between supernumerary teeth (ST) and impacted incisors. The authors investigated the relationship between ST and impacted incisors in the maxillary anterior area in the mixed dentition. Using cone-beam computed tomography, the authors diagnosed 417 ST among 294 patients (age range, 6-12 years; 220 boys and 74 girls). The number, morphology, growth orientation, and position of ST were recorded along with the presence of impacted incisors. The authors reported that 23.1% of patients having ST (n = 68; mean [standard deviation] age 8.5 [1.6] years) also had impacted incisors. Morphology (molariform and odontomelike), growth orientation (normal and no orientation), and position (coronal) of the ST were significantly associated with impacted incisors (P mixed dentition. The presence and morphology of ST should alert the clinician to the increased likelihood of having impacted incisors and the need for early diagnosis and appropriate treatment. Copyright © 2017 American Dental Association. Published by Elsevier Inc. All rights reserved.

  7. Characteristics and sequelae of erupted supernumerary teeth: A study of 218 cases among Sri Lankan children.

    Science.gov (United States)

    Herath, Chandra; Jayawardena, Chantha; Nagarathne, Nandani; Perera, Kanthi

    2016-12-19

    In the present study, we investigated the characteristics and sequelae of erupted supernumerary teeth (ST) in a sample of Sri Lankan children. Data were recorded from patients' clinical records, radiographs, models, and extracted teeth. The sample consisted of 239 ST from 218 patients. The mean age of the sample was 9.08 ± 2.47 years. The male-to-female ratio was 2.8:1. The majority (42.66%) of patients with ST were in aged 8-10 years. Many (94.94%) of the ST were located in the premaxilla (incisor), followed by the canine (4.22%), premolar (0.42%), and molar (0.42%) regions. The most common shape of ST teeth was conical. Malocclusion (59.83%) was the major problem associated with ST, and the clinical impact was highest on the 8-10-year age group. A strong association was observed between patients' age and clinical impact to the dentition (χ(2) =42.09, P=.000). Because the majority of ST can lead to malocclusion, especially in mixed dentition, awareness, early detection, and timely clinical intervention of ST are recommended. © 2016 John Wiley & Sons Australia, Ltd.

  8. A clinical, cytogenetic, FISH and molecular study of supernumerary marker 15 chromosomes

    Energy Technology Data Exchange (ETDEWEB)

    Dennis, N.R. [Princess Anne Hospital, Southampton (United Kingdom); Crolla, J.A.; Harvey, J.F. [Salisbury District Hospital (United Kingdom)

    1994-09-01

    We studied 17 patients with supernumerary marker chromosomes shown by fluorescent in situ hybridization (FISH) with the 15-centromere specific probe pTRA-25 to be 15-derived. Genetic constitution of the marker chromosomes was investigated using FISH, Southern blot analysis and PCR for proximal and distal loci on 15q as well as conventional cytogenetics. Eight of the 17 patients were mentally retarded. Six of the eight carried a de novo marker 15 containing one or two doses of loci known to be in or near the Prader-Willi/Angelman (PWS/AS) region, whereas none of the nine non-retarded patients had duplications of this region, and only two of the eight whose parents were available had a de novo marker. None of the mentally retarded patients had PWS or AS. In two retarded patients (one de novo, one familial) there was no duplication of the PWS/AS region. Uniparental disomy affecting the normal 15 homologs was excluded in 10 of the patients, including all eight with mental retardation.

  9. 17β-Estradiol induces supernumerary primordial germ cells in embryos of the polychaete Platynereis dumerilii.

    Science.gov (United States)

    Lidke, Anika K; Bannister, Stephanie; Löwer, Andreas M; Apel, David M; Podleschny, Martina; Kollmann, Martin; Ackermann, Christian F; García-Alonso, Javier; Raible, Florian; Rebscher, Nicole

    2014-01-15

    In the polychaete Platynereis dumerilii exactly four primordial germ cells (PGCs) arise in early development and are subject to a transient mitotic arrest until the animals enter gametogenesis. In order to unravel the mechanisms controlling the number of PGCs in Platynereis, we tested whether the steroid 17β-estradiol (E2) is able to induce PGC proliferation, as it had been described in other species. Our data provide strong support for such a mechanism, showing that E2 significantly increases the occurrence of larvae with supernumerary PGCs in Platynereis in a dose dependent manner. E2 responsiveness is restricted to early developmental stages, when the PGCs are specified. During these stages, embryos exhibit high expression levels of the estradiol receptor (ER). The ER transcript localizes to the yolk-free cytoplasm of unfertilized eggs and segregates into the micromeres during cleavage stages. Nuclear ER protein is found asymmetrically distributed between daughter cells. Neither transcript nor protein is detectable in PGCs at larval stages. Addition of the specific estradiol receptor inhibitor ICI-182,780 (ICI) abolishes the proliferative effect of E2, suggesting that it is mediated by ER signaling. Our study reports for the first time an ER mediated proliferative effect of E2 on PGCs in an invertebrate organism. Copyright © 2013 Elsevier Inc. All rights reserved.

  10. An EMG Interface for the Control of Motion and Compliance of a Supernumerary Robotic Finger

    Directory of Open Access Journals (Sweden)

    Irfan Hussain

    2016-11-01

    Full Text Available In this paper, we present an electromyographic (EMG control interface for a supernumerary robotic finger. This novel wearable robot can be used to compensate the missing grasping abilities in chronic stroke patients or to augment human healthy hand so to enhance its grasping capabilities and workspace. The proposed EMG interface controls the motion of the robotic extra finger and its joint compliance. In particular, we use a commercial EMG armband for gesture recognition to be associated with the motion control of the robotic device and surface one channel EMG electrodes interface to regulate the compliance of the robotic device. We also present an updated version of a robotic extra finger where the adduction/abduction motion is realized through ball bearing and spur gears mechanism. We validated the proposed interface with two sets of experiments related to compensation and augmentation. In the first set of experiments, different bi-manual tasks have been performed with the help of the robotic device and simulating a paretic hand. In the second set, the robotic extra finger is used to enlarge the workspace and manipulation capability of healthy hands. In both the sets, the same EMG control interface has been used. The obtained results demonstrate that the proposed control interface is intuitive and can successfully be used for both compensation and augmentation purposes. The proposed approach can be exploited also for the control of different wearable devices that has to actively cooperate with the human limbs.

  11. Clinical management of a fused mandibular lateral incisor with supernumerary tooth: A case report

    Directory of Open Access Journals (Sweden)

    Seda Aydemir

    2016-01-01

    Full Text Available The purpose of this report is to present a rare case of a fused mandibular lateral incisor with supernumerary tooth with a follow-up for 18-months. A 35-year-old female patient was referred to our clinic with an extraoral sinus tract in the chin. The intraoral diagnosis revealed the fusion of her mandibular lateral incisors. Vitality pulp tests were negative for mandibular right central and lateral incisors. Radiographic examinations showed a fused tooth with two separate pulp chambers, two distinct roots, and two separate root canals. There were also periapical lesion of fused teeth and mandibular right central incisor, so endodontic treatment was carried out the related teeth. Radiographic examination revealed a complete healing of the lesion postoperatively at the end of 18-months. This paper reports the successful endodontic and restorative treatment of unilateral fused incisors. Because of the abnormal morphology of the crown and the complexity of the root canal system in fused teeth, treatment protocols require special attention.

  12. Familial ring (18) mosaicism in a 23-year-old young adult with 46,XY,r(18) (::p11→q21::)/46,XY karyotype, intellectual disability, motor retardation and single maxillary incisor and in his phenotypically normal mother, karyotype 47,XX,+r(18)(::p11→q21::)/46,XX.

    Science.gov (United States)

    Balci, Sevim; Tümer, Celal; Karaca, Ciğdem; Bartsch, Oliver

    2011-05-01

    We report on a 23-year-old man with craniofacial findings of the holoprosencephaly spectrum disorder (microcephaly, hypotelorism, depressed nasal bridge, single median maxillary central incisor), fusion of C2-C3 vertebrae, intellectual disability, and severe sleep apnea. Chromosome analysis of blood lymphocytes showed 75% ring (18) cells and 25% normal cells, karyotype mos 46,XY,r(18)(::p11→q21::)[75]/46,XY[25]. His mother was phenotypically normal except for a double ureter and bifid renal pelvis as in his son. She had a supernumerary ring (18) in 10% of blood lymphocytes, karyotype mos 47,XX,+r(18)(::p11→q21::)[10]/46,XX[90]. Familial ring (18) is a rare cytogenetic abnormality. This is the first report of a mother with a supernumerary ring (18) and a son with ring (18) mosaicism. Interestingly, the son showed a true mosaicism (mixoploidy) of ring (18) and normal cells. The mother's 46,XX cells could be easily explained by mitotic instability and ring loss during cell division. However, the coexistence of ring (18) and normal cells in the son is unusual. Possibly, during early postzygotic divisions of a 47,XY,+r(18) zygote, two (possibly subsequent) genetic events could have occurred, one when one normal chromosome 18 was lost (resulting in a cell line with ring 18), and one when the ring 18 was lost (resulting in a cell line without ring, "escape to normal"). Alternatively, the zygote of the son could have been 46,XY,r(18), and postzygotic loss of the ring 18 could have resulted in monosomy 18 cells followed by duplication of chromosome 18 in these cells (a rare mechanism for cell survival previously described as "compensatory" isodisomy). Copyright © 2011 Wiley-Liss, Inc.

  13. Nanoscale borromean rings.

    Science.gov (United States)

    Cantrill, Stuart J; Chichak, Kelly S; Peters, Andrea J; Stoddart, J Fraser

    2005-01-01

    The molecular expression of topologically interesting structures represents a formidable challenge for synthetic chemists. The nontrivial link known as the Borromean rings has long been regarded as one of the most ambitious targets in this field. Of ancient provenance, this symbol comprises three interlocked rings in an inseparable union, but cut any one of the rings and the whole assembly unravels into three separate pieces. This Account delineates different strategies that can be applied to the formation of molecules possessing this distinctive topology, culminating with two successful syntheses of such compounds, thus cutting the Gordian knot of topological chemistry.

  14. Saturn's Rings are Fractal

    OpenAIRE

    Li, Jun; Ostoja-Starzewski, Martin

    2012-01-01

    Over the past few decades, various conjectures were advanced that Saturn's rings are Cantor-like sets, although no convincing fractal analysis of actual images has ever appeared. We focus on the images sent by the Cassini spacecraft mission: slide #42 "Mapping Clumps in Saturn's Rings" and slide #54 "Scattered Sunshine". Using the box-counting method, we determine the fractal dimension of rings seen here (and in several other images from the same source) to be consistently about 1.6~1.7. This...

  15. Modified Newton's rings: II

    OpenAIRE

    Chaitanya, T. Sai; Kumar, Rajiv; Krishna, V. Sai; Anandh, B Shankar; Umesh, K S

    2010-01-01

    In an earlier work (Shankar kumar Jha, A Vyas, O S K S Sastri, Rajkumar Jain & K S Umesh, 'Determination of wavelength of laser light using Modified Newton's rings setup', Physics Education, vol. 22, no.3, 195-202(2005)) reported by our group, a version of Newton's rings experiment called Modified Newton's rings was proposed. The present work is an extension of this work. Here, a general formula for wavelength has been derived, applicable for a plane of observation at any distance. A relation...

  16. Ring chromosome 13

    DEFF Research Database (Denmark)

    Brandt, C A; Hertz, Jens Michael; Petersen, M B

    1992-01-01

    A stillborn male child with anencephaly and multiple malformations was found to have the karyotype 46,XY,r(13) (p11q21.1). The breakpoint at 13q21.1, determined by high resolution banding, is the most proximal breakpoint ever reported in patients with ring chromosome 13. In situ hybridisation...... with the probe L1.26 confirmed the derivation from chromosome 13 and DNA polymorphism analysis showed maternal origin of the ring chromosome. Our results, together with a review of previous reports of cases with ring chromosome 13 with identified breakpoints, could neither support the theory of distinct clinical...

  17. Faithfully quadratic rings

    CERN Document Server

    Dickmann, M

    2015-01-01

    In this monograph the authors extend the classical algebraic theory of quadratic forms over fields to diagonal quadratic forms with invertible entries over broad classes of commutative, unitary rings where -1 is not a sum of squares and 2 is invertible. They accomplish this by: (1) Extending the classical notion of matrix isometry of forms to a suitable notion of T-isometry, where T is a preorder of the given ring, A, or T = A^2. (2) Introducing in this context three axioms expressing simple properties of (value) representation of elements of the ring by quadratic forms, well-known to hold in

  18. A rapid protection switching method in carrier ethernet ring networks

    Science.gov (United States)

    Yuan, Liang; Ji, Meng

    2008-11-01

    Abstract: Ethernet is the most important Local Area Network (LAN) technology since more than 90% data traffic in access layer is carried on Ethernet. From 10M to 10G, the improving Ethernet technology can be not only used in LAN, but also a good choice for MAN even WAN. MAN are always constructed in ring topology because the ring network could provide resilient path protection by using less resource (fibre or cable) than other network topologies. In layer 2 data networks, spanning tree protocol (STP) is always used to protect transmit link and preventing the formation of logic loop in networks. However, STP cannot guarantee the efficiency of service convergence when link fault happened. In fact, convergent time of networks with STP is about several minutes. Though Rapid Spanning Tree Protocol (RSTP) and Multi-Spanning Tree Protocol (MSTP) improve the STP technology, they still need a couple of seconds to achieve convergence, and can not provide sub-50ms protection switching. This paper presents a novel rapid ring protection method (RRPM) for carrier Ethernet. Unlike other link-fault detection method, it adopts distributed algorithm to detect link fault rapidly (sub-50ms). When networks restore from link fault, it can revert to the original working state. RRPM can provide single ring protection and interconnected ring protection without the formation of super loop. In normal operation, the master node blocks the secondary port for all non-RRPM Ethernet frames belonging to the given RRPM Ring, thereby avoiding a loop in the ring. When link fault happens, the node on which the failure happens moves from the "ring normal" state to the "ring fault" state. It also sends "link down" frame immediately to other nodes and blocks broken port and flushes its forwarding database. Those who receive "link down" frame will flush forwarding database and master node should unblock its secondary port. When the failure restores, the whole ring will revert to the normal state. That is

  19. Vortex and source rings

    DEFF Research Database (Denmark)

    Branlard, Emmanuel Simon Pierre

    2017-01-01

    The velocity field, vector potential and velocity gradient of a vortex ring is derived in this chapter. The Biot-Savart law for the vector potential and velocity is expressed in a first section. Then, the flow is derived at specific locations: on the axis, near the axis and in the far field where...... the analogy to a doublet field is made. The following section derive the value of the vector potential and velocity field in the full domain. The expression for the velocity gradient is also provided since it may be relevant in a simulation with vortex particles and vortex rings. Most of this chapter...... is dedicated to vortex rings. Source rings are only briefly mentioned....

  20. The g-2 ring

    CERN Multimedia

    1974-01-01

    The precise measurement of "g-2", the anomalous magnetic moment of the muon, required a special muon storage ring with electrostatic focussing and very accurate knowledge of the magnetic bending field. For more details see under photo 7405430.

  1. Ringed Seal Distribution Map

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset contains GIS layers that depict the known spatial distributions (i.e., ranges) of the five subspecies of ringed seals (Phoca hispida). It was produced...

  2. Integrations on rings

    Directory of Open Access Journals (Sweden)

    Banič Iztok

    2017-04-01

    Full Text Available In calculus, an indefinite integral of a function f is a differentiable function F whose derivative is equal to f. The main goal of the paper is to generalize this notion of the indefinite integral from the ring of real functions to any ring. We also investigate basic properties of such generalized integrals and compare them to the well-known properties of indefinite integrals of real functions.

  3. Matrimonial ring structures

    OpenAIRE

    Hamberger, Klaus; Houseman, Michael; Daillant, Isabelle; White, Douglas R.; Barry, Laurent

    2006-01-01

    The paper deals with matrimonial rings, a particular kind of cycles in kinship networks which result when spouses are linked to each other by ties of consanguinity or affinity. By taking a network-analytic perspective, the paper endeavours to put this classical issue of structural kinship theory on a general basis, such as to allow conclusions which go beyond isolated discussions of particular ring types (like "cross-cousin marriage", "sister exchange", and so forth). The paper provides a def...

  4. 5-minute Gridded Global Relief Data (ETOPO5)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Earth topography five minute grid (ETOPO5) is a gridded data base of worldwide elevations derived from several sources at a resolution of 5 minutes of latitude and...

  5. Bragg grating writing in PMMA microstructured polymer optical fibers in less than 7 minutes

    DEFF Research Database (Denmark)

    Bundalo, Ivan-Lazar; Nielsen, Kristian; Markos, Christos

    2014-01-01

    We demonstrate fiber Bragg grating (FBG) writing in PMMA microstructured Polymer Optical Fibers (mPOFs) using UV Phase Mask technique with writing times shorter than 10 min. The shortest writing time was 6 minutes and 50 seconds and the longest writing time was 8 min and 50 sec. The FBGs were...... written in a 125 x00B5;m PMMA mPOF having 3-rings of holes, the reflection peaks were centred at 632.6 nm and have a reflectivity as high as 26 dB. We also demonstrate how the writing dynamics depends on the intensity of the writing beam....

  6. Bragg grating writing in PMMA microstructured polymer optical fibers in less than 7 minutes

    OpenAIRE

    Bundalo, Ivan-Lazar; Nielsen, Kristian; Markos, Christos; Bang, Ole

    2014-01-01

    We demonstrate fiber Bragg grating (FBG) writing in PMMA microstructured Polymer Optical Fibers (mPOFs) using UV Phase Mask technique with writing times shorter than 10 min. The shortest writing time was 6 minutes and 50 seconds and the longest writing time was 8 min and 50 sec. The FBGs were written in a 125 x00B5;m PMMA mPOF having 3-rings of holes, the reflection peaks were centred at 632.6 nm and have a reflectivity as high as 26 dB. We also demonstrate how the writing dynamics depends on...

  7. Holomorphic Dynamics and Herman Rings

    DEFF Research Database (Denmark)

    Henriksen, Christian

    1997-01-01

    Existence theorem for Herman Rings of holomorphic mappings in a certain holomorphic family is given, using quasiconformal mappings. Proofs of topological properties of these Herman rings are given.......Existence theorem for Herman Rings of holomorphic mappings in a certain holomorphic family is given, using quasiconformal mappings. Proofs of topological properties of these Herman rings are given....

  8. The acceptability and safety of the Shang Ring for adult male circumcision in Rakai, Uganda.

    Science.gov (United States)

    Kigozi, Godfrey; Musoke, Richard; Watya, Stephen; Kighoma, Nehemiah; Ssebbowa, Paschal; Serwadda, David; Nalugoda, Fred; Makumbi, Frederick; Li, Philip; Lee, Richard; Goldstein, Marc; Wawer, Maria; Sewankambo, Nelson; Gray, Ronald H

    2013-08-15

    Medical male circumcision (MMC) is recommended for HIV prevention in men. We assessed the acceptability and safety of the Shang Ring device compared with those of the dorsal slit method. HIV-negative, uncircumcised men aged 18 years or older who requested free MMC services in rural Rakai, Uganda, were informed about the Shang Ring and dorsal slit procedures and offered a free choice of procedure. Men were followed at 7 days postoperatively to assess adverse events related to surgery and to remove the Shang Ring. Wound healing was assessed at 4 weeks postoperatively. Six hundred twenty-one men were enrolled, of whom 508 (81.8%) chose the Shang Ring and 113 the dorsal slit. The Shang Ring was provided to 504 men, among whom there were 4 failures of Ring placement (0.8%) that required surgical hemostasis and wound closure. Five hundred men received the Shang Ring and postoperative surgery-related moderate adverse events were 1.0%, compared with 0.8% among dorsal slit recipients. Complete wound healing at 4 weeks was 84% with the Ring and 100% with the dorsal slit (P < 0001). Resumption of intercourse before 4 weeks was 7.0% with the Ring and 15.0% with the dorsal slit (P = 0.01.) The mean time for surgery was 6.1 minutes with the Ring and 17.7 minutes with the dorsal slit. The mean time for Ring removal was 2.2 minutes. The Shang Ring is highly acceptable and safe in this setting, and could improve the efficiency of MMC services. However, back-up surgical services are needed in cases of Ring placement failures.

  9. Small supernumerary marker chromosomes (SMCs): genotype-phenotype correlation and classification.

    Science.gov (United States)

    Starke, Heike; Nietzel, Angela; Weise, Anja; Heller, Anita; Mrasek, Kristin; Belitz, Britta; Kelbova, Christine; Volleth, Marianne; Albrecht, Beate; Mitulla, Beate; Trappe, Ralf; Bartels, Iris; Adolph, Sabine; Dufke, Andreas; Singer, Sylke; Stumm, Markus; Wegner, Rolf-Dieter; Seidel, Jörg; Schmidt, Angela; Kuechler, Alma; Schreyer, Isolde; Claussen, Uwe; von Eggeling, Ferdinand; Liehr, Thomas

    2003-12-01

    Small supernumerary marker chromosomes (SMCs) are present in about 0.05% of the human population. In approximately 30% of SMC carriers (excluding the approximately 60% SMC derived from one of the acrocentric chromosomes), an abnormal phenotype is observed. The clinical outcome of an SMC is difficult to predict as they can have different phenotypic consequences because of (1). differences in euchromatic DNA-content, (2). different degrees of mosaicism, and/or (3). uniparental disomy (UPD) of the chromosomes homologous to the SMC. Here, we present 35 SMCs, which are derived from all human chromosomes, apart from chromosome 6, as demonstrated by the appropriate molecular cytogenetic approaches, such as centromere-specific multicolor fluoresence in situ hybridization (cenM-FISH), multicolor banding (MCB), and subcentromere-specific multicolor FISH (subcenM-FISH). In nine cases without an aberrant phenotype, neither partial proximal trisomies nor UPD could be detected. Abnormal clinical findings, such as psychomotoric retardation and/or craniofacial dysmorphisms, were associated with seven of the cases in which subcentromeric single-copy probes were proven to be present in three copies. Conversely, in eight cases with a normal phenotype, proximal euchromatic material was detected as partial trisomy. UPD was studied in 12 cases and subsequently detected in two of the cases with SMC (partial UPD 4p and maternal UPD 22 in a der(22)-syndrome patient), indicating that SMC carriers have an enhanced risk for UPD. At present, small proximal trisomies of 1p, 1q, 2p, 6p, 6q, 7q, 9p, and 12q seem to lead to clinical manifestations, whereas partial proximal trisomies of 2q, 3p, 3q, 5q, 7p, 8p, 17p, and 18p may not be associated with significant clinical symptoms. With respect to clinical outcome, a classification of SMCs is proposed that considers molecular genetic and molecular cytogenetic characteristics as demonstrated by presently available methods.

  10. Small supernumerary marker chromosomes (sSMC in humans; are there B chromosomes hidden among them

    Directory of Open Access Journals (Sweden)

    Ogilvie Caroline

    2008-06-01

    Full Text Available Abstract Background Small supernumerary marker chromosomes (sSMC and B-chromosomes represent a heterogeneous collection of chromosomes added to the typical karyotype, and which are both small in size. They may consist of heterochromatic and/or euchromatic material. Also a predominance of maternal transmission was reported for both groups. Even though sSMC and B-chromosomes show some similarity it is still an open question if B-chromosomes are present among the heterogeneous group of sSMC. According to current theories, sSMC would need drive, drift or beneficial effects to increase in frequency in order to become B chromosome. However, up to now no B-chromosomes were described in human. Results Here we provide first evidence and discuss, that among sSMC B-chromosomes might be hidden. We present two potential candidates which may already be, or may in future evolve into B chromosomes in human: (i sSMC cases where the marker is stainable only by DNA derived from itself; and (ii acrocentric-derived inverted duplication sSMC without associated clinical phenotype. Here we report on the second sSMC stainable exclusively by its own DNA and show that for acrocentric derived sSMC 3.9× more are familial cases than reported for other sSMC. Conclusion The majority of sSMC are not to be considered as B-chromosomes. Nonetheless, a minority of sSMC show similarities to B-chromosomes. Further studies are necessary to come to final conclusions for that problem.

  11. Extended culture of poor-quality supernumerary embryos improves ART outcomes.

    Science.gov (United States)

    Sallem, Amira; Santulli, Pietro; Barraud-Lange, Virginie; Le Foll, Nathalie; Ferreux, Lucile; Maignien, Chloé; Bourdon, Mathilde; Chapron, Charles; de Ziegler, Dominique; Wolf, Jean-Philippe; Pocate-Cheriet, Khaled

    2017-10-18

    The aims of this study were to investigate the possible benefits of extending the culture of poor-quality day-2 embryos (PQE) versus good-quality embryos (GQE) and to identify factors associated with pregnancy and live birth when transferring frozen-thawed blastocysts originating from GQE and PQE. This is a retrospective cohort follow-up study performed between November 2012 and February 2015 at the IVF Laboratory Unit of Cochin University Hospital (Paris, France) including 3108 day-2 supernumerary embryos resulting from 1237 IVF/ICSI cycles. Total blastulation rate was 67.2% from GQE and 48.7% from PQE. Percentage of good-quality blastocysts was 60.7 and 47.9% respectively including 14.7 and 7.3% top-quality blastocysts. A total of 150 blastocysts originating from GQE and 729 from PQE were frozen, and then, 37 and 164 were thawed and transferred respectively resulting in 19 (51.4%) and 61 (37.9%) clinical pregnancies with 13 (35.1%) deliveries from GQE and 32 (19.9%) from PQE (p = 0.046) without any difference in neonatal outcomes. Quality of blastocysts that resulted in live birth was similar in the two groups. Women < 35 years old and day-5 blastocyst expansion were predictive of pregnancy and live birth. (i) PQE are able to reach the blastocyst stage, to implant, and to give healthy babies and (ii) women age and day of blastocyst expansion are predictive of pregnancy and live birth.

  12. Esthetic and endodontic management of fused maxillary lateral incisor and supernumerary teeth with all ceramic restoration after trauma

    Directory of Open Access Journals (Sweden)

    Kiranmeet Kaur Khurana

    2014-01-01

    Full Text Available Double or fusion of the teeth is a primary developmental anomaly union of two independently developing primary or permanent teeth. The tooth fusion may contribute to various significant problems such as crowding, caries and periodontal diseases. Fused teeth require an interdisciplinary approach combining the endodontic, esthetic and prosthetic treatments. All ceramic restoration meets the requirement of better appearance, biocompatibility and long life. By using restorative therapy esthetic and functional criteria were satisfied. Management of a case of fusion of a maxillary lateral incisor and a supernumerary tooth is presented.

  13. Supernumerary teeth and pseudarthrosis of the mandible in a young male from the mediaeval cemetery in Stenjevec

    Directory of Open Access Journals (Sweden)

    Željka Bedić

    2010-06-01

    Full Text Available Anthropological analysis of a young adult male from the mediaeval Stenjevec skeletal series revealed supernumerary teeth on both sides of the mandible, and an un-united subcondylar fracture of the mandible. The first condition is a developmental abnormality, while subcondylar fractures are one of the most frequent fractures of the mandible. Although, the osteological collection of the Department of Archaeology of the Croatian academy of Sciences and Arts consists of nearly 5,500 skeletons, this is the first documented case that exhibits these conditions in Croatian archaeological skeletal series.

  14. A Postaxial Polydactyly with a Partial Duplication of the Fifth Metatarsal Without a Supernumerary Digit. Is Excision of the Duplicated Metatarsal Necessary?

    Science.gov (United States)

    Choi, Gi Won; Yoon, Jung Ro; Kim, Youngbae B; Yu, Jung Jin; Seo, Hyo Seong; Kim, Taik Seon

    2015-05-01

    Postaxial polydactyly of the foot is one of the most common congenital malformations. Only a few cases of postaxial polydactyly with a partial duplication of the fifth metatarsal without a supernumerary digit have been reported, and both metatarsal heads were united to form a common joint with the proximal phalanx in all of those cases. We present a rare case of postaxial polydactyly with a partial duplication of the fifth metatarsal characterized by dual metatarsal heads and an extra proximal phalanx bud, without a supernumerary digit.

  15. Multiple Impacted Permanent and Supernumerary Teeth in the Anterior Mandible of Nonsyndromic Case: A Systematic Review and Multidisciplinary Approach to Management

    Directory of Open Access Journals (Sweden)

    Pushkar Gawande

    2015-01-01

    Full Text Available Multiple impacted permanent and supernumerary teeth have been associated with the syndromes and metabolic disorders. Approximately, 75% of all the supernumerary teeth are impacted and are asymptomatic. Consequently, most such teeth constitute casual findings in the context of routine X-ray studies. Lack of eruptive force and rotation of tooth buds may cause multiple impactions, and additional examinations may be necessary to exclude systemic and metabolic conditions. We present a rare nonsyndromic case with 11 multiple impacted teeth in the anterior mandible, with systematic literature review and multidisciplinary management.

  16. Schatzki ring, statistically reexamined.

    Science.gov (United States)

    Pezzullo, John C; Lewicki, Ann M

    2003-09-01

    In the article by Schatzki published in 1963, data about the lower esophageal ring relate ring diameter to presence of dysphagia. Statistical analysis of these measurements was performed to quantify conclusions of Schatzki and to extract additional information from the data. Ring diameters in 332 patients with and without dysphagia are described in a histogram in the original article of Schatzki. Data were evaluated with analysis of variance, logistic regression, and receiver operating characteristic (ROC) analysis to quantify the relationship between ring diameter and dysphagia. Follow-up information was available in 36 symptomatic and 30 asymptomatic patients of Schatzki. Logistic regression indicated that there was a highly significant difference in ring diameter between the asymptomatic group and patients with recurrent dysphagia (P Schatzki had a 96% (104 of 108) sensitivity and a 58% (130 of 224) specificity, with area under the ROC curve of 0.888. Retrospective statistical analysis of original data of Schatzki validated his major conclusions about the data. Some important questions remain unanswered because of missing data in the study of Schatzki. Copyright RSNA, 2003

  17. A methodology to filter time series: application to minute-by-minute electric load series

    Directory of Open Access Journals (Sweden)

    Mayte Suarez-Farinas

    2004-12-01

    Full Text Available In this article a methodology for filtering a time series is presented, with application to high frequency series such as the minute-by-minute electric load series. The goal of this approach is to detect and substitute the irregularities of the time series that can produce distortions on the modelling stage. Outlier values are detected through a dynamic linear model and the Bayes factor tool; missing values are then interpolated with a Smoothing Cubic Spline. The performance of the proposed approach is illustrated using real data and evaluated through a series of tests where the irregularities have been simulated.Neste artigo apresenta-se uma metodologia para a filtragem de séries temporais, com aplicação em séries de alta freqüência. Esta metodologia tem como objetivo detectar e substituir as irregularidades da série temporal que podem comprometer a etapa de modelagem. São detalhados o modelo linear dinâmico utilizado para detectar os valores outliers e o emprego do Fator de Bayes. Na interpolação de valores faltantes utiliza-se o Spline Cúbico Suavizado. O desempenho da metodologia proposta é avaliado a través de vários testes onde as irregularidade foram simuladas.

  18. Carbonatite ring-complexes explained by caldera-style volcanism.

    Science.gov (United States)

    Andersson, Magnus; Malehmir, Alireza; Troll, Valentin R; Dehghannejad, Mahdieh; Juhlin, Christopher; Ask, Maria

    2013-01-01

    Carbonatites are rare, carbonate-rich magmatic rocks that make up a minute portion of the crust only, yet they are of great relevance for our understanding of crustal and mantle processes. Although they occur in all continents and from Archaean to present, the deeper plumbing system of carbonatite ring-complexes is usually poorly constrained. Here, we show that carbonatite ring-complexes can be explained by caldera-style volcanism. Our geophysical investigation of the Alnö carbonatite ring-complex in central Sweden identifies a solidified saucer-shaped magma chamber at ~3 km depth that links to surface exposures through a ring fault system. Caldera subsidence during final stages of activity caused carbonatite eruptions north of the main complex, providing the crucial element to connect plutonic and eruptive features of carbonatite magmatism. The way carbonatite magmas are stored, transported and erupt at the surface is thus comparable to known emplacement styles from silicic calderas.

  19. Oligomeric ferrocene rings

    Science.gov (United States)

    Inkpen, Michael S.; Scheerer, Stefan; Linseis, Michael; White, Andrew J. P.; Winter, Rainer F.; Albrecht, Tim; Long, Nicholas J.

    2016-09-01

    Cyclic oligomers comprising strongly interacting redox-active monomer units represent an unknown, yet highly desirable class of nanoscale materials. Here we describe the synthesis and properties of the first family of molecules belonging to this compound category—differently sized rings comprising only 1,1‧-disubstituted ferrocene units (cyclo[n], n = 5-7, 9). Due to the close proximity and connectivity of centres (covalent Cp-Cp linkages; Cp = cyclopentadienyl) solution voltammograms exhibit well-resolved, separated 1e- waves. Theoretical interrogations into correlations based on ring size and charge state are facilitated using values of the equilibrium potentials of these transitions, as well as their relative spacing. As the interaction free energies between the redox centres scale linearly with overall ring charge and in conjunction with fast intramolecular electron transfer (˜107 s-1), these molecules can be considered as uniformly charged nanorings (diameter ˜1-2 nm).

  20. Decay ring design

    CERN Document Server

    Chancé, A; Bouquerel, E; Hancock, S; Jensen, E

    The study of the neutrino oscillation between its different flavours needs pureand very intense fluxes of high energy, well collimated neutrinos with a welldetermined energy spectrum. A dedicated machine seems to be necessarynowadays to reach the required flux. A new concept based on the β-decayof radioactive ions which were accelerated in an accelerator chain was thenproposed. After ion production, stripping, bunching and acceleration, the unstableions are then stored in a racetrack-shaped superconducting decay ring.Finally, the ions are accumulated in the decay ring until being lost. The incomingbeam is merged to the stored beam by using a specific RF system, whichwill be presented here.We propose here to study some aspects of the decay ring, such as its opticalproperties, its RF system or the management of the losses which occur in thering (mainly by decay or by collimation).

  1. Den mindst ringe verdensorden

    DEFF Research Database (Denmark)

    Hansen, Birthe

    2015-01-01

    I 25 år har USA's styrkeposition og politik forsynet os med en 'verdensorden', der i et historisk perspektiv fremstår som den mindst ringe: fravær af store krige, mere demokrati, økonomisk fremgang - men dog også sammenbrudte stater og terrorisme.......I 25 år har USA's styrkeposition og politik forsynet os med en 'verdensorden', der i et historisk perspektiv fremstår som den mindst ringe: fravær af store krige, mere demokrati, økonomisk fremgang - men dog også sammenbrudte stater og terrorisme....

  2. Electrothermal Ring Burn

    Directory of Open Access Journals (Sweden)

    Yakup Çil

    2012-09-01

    Full Text Available Low-voltage fountainheads such as car, tractor or motorcycle batteries are predisposed to produce large currents. Any metal object that comes into contact with these batteries may result in short-circuit. This may result in rapid and excessive heating of metal object and an electrothermal burn. Herein we presented a motorcycle driver who was 28-year-old man with electrothermal ring burn which was caused by metal chain that was used as a ring. (Turk J Dermatol 2012; 6: 106-7

  3. Saturn's Rings, the Yarkovsky Effects, and the Ring of Fire

    Science.gov (United States)

    Rubincam, David Parry

    2004-01-01

    The dimensions of Saturn's A and B rings may be determined by the seasonal Yarkovsky effect and the Yarkovsky-Schach effect; the two effects confine the rings between approximately 1.68 and approximately 2.23 Saturn radii, in reasonable agreement with the observed values of 1.525 and 2.267. The C ring may be sparsely populated because its particles are transients on their way to Saturn; the infall may create a luminous Ring of Fire around Saturn's equator. The ring system may be young: in the past heat flow from Saturn's interior much above its present value would not permit rings to exist.

  4. [OR minute myth : Guidelines for calculation of DRG revenues per OR minute].

    Science.gov (United States)

    Waeschle, R M; Hinz, J; Bleeker, F; Sliwa, B; Popov, A; Schmidt, C E; Bauer, M

    2016-02-01

    The economic situation in German Hospitals is tense and needs the implementation of differentiated controlling instruments. Accordingly, parameters of revenue development of different organizational units within a hospital are needed. This is particularly necessary in the revenue and cost-intensive operating theater field. So far there are only barely established productivity data for the control of operating room (OR) revenues during the year available. This article describes a valid method for the calculation of case-related revenues per OR minute conform to the diagnosis-related groups (DRG).For this purpose the relevant datasets from the OR information system and the § 21 productivity report (DRG grouping) of the University Medical Center Göttingen were combined. The revenues defined in the DRG browser of the Institute for Hospital Reimbursement (InEK) were assigned to the corresponding process times--incision-suture time (SNZ), operative preparation time and anesthesiology time--according to the InEK system. All full time stationary DRG cases treated within the OR were included and differentiated according to the surgical department responsible. The cost centers "OR section" and "anesthesia" were isolated to calculate the revenues of the operating theater. SNZ clusters and cost type groups were formed to demonstrate their impact on the revenues per OR minute. A surgical personal simultaneity factor (GZF) was calculated by division of the revenues for surgeons and anesthesiologists. This factor resembles the maximum DRG financed personnel deployment for surgeons in German hospitals.The revenue per OR minute including all cost types and DRG was 16.63 €/min. The revenues ranged from 10.45 to 24.34 €/min depending on the surgical field. The revenues were stable when SNZ clusters were analyzed. The differentiation of cost type groups revealed a revenue reduction especially after exclusion of revenues for implants and infrastructure. The calculated GZF over

  5. An unusual double supernumerary maxillary mesiodens in a Middle Iron Age skeleton from South Uist, Western Isles, Scotland.

    Science.gov (United States)

    Ives, Rachel

    2014-06-01

    Bilaterally occurring and fully erupted mesiodens occur infrequently in the modern population and have been little documented from past populations. This research presents an unusual case of a double maxillary mesiodens in the permanent dentition occurring in skeletal remains dating to the Middle Iron Age (250-410 AD) from South Uist, Western Isles of Scotland. Osteological analysis of an adult male included the inventory of teeth present/absent and analysis of dental pathologies (caries, calculus, periodontal disease, ante-mortem tooth loss, periapical abscesses), developmental defects and orthodontic anomalies (enamel hypoplastic defects, malposition, rotation, crowding, agenesis and supernumerary teeth). An unusual expression of double, fully erupted, mesiodens in the anterior permanent maxillary dentition representing supernumerary central incisors exists. The complete eruption had contributed to anterior displacement of one central incisor alveolar socket similar to documented modern clinical cases. Shallow sockets also implied an associated stunted development of the original central maxillary incisor roots. Occlusal enamel wear indicated the mesiodens had been abraded during mastication. Current clinical data suggest there is a much higher tendency for single mesiodens to exist rather than double and examples often fail to fully erupt into the dentition. This relative rarity may account for the few previous reports of this dental anomaly from past human remains and especially of this date. The fully erupted double example from South Uist contributes to the known evidence for orthodontic anomalies in the past. Copyright © 2014 Elsevier Ltd. All rights reserved.

  6. Double talon cusps on supernumerary tooth fused to maxillary central incisor: Review of literature and report of case

    Science.gov (United States)

    2014-01-01

    Human tooth development is a continuous process begin at the sixth weeks in utero and extends to about sixth months after birth for the primary dentition and from sixteenth week in utero to late adolescence for permanent dentition. There is no other organ of the human body which takes so long to attain its ultimate morphology as dentition. Several physiologic growth processes participate in the progressive development of the teeth including: initiation, proliferation, histodifferentiation, morphodifferentiation, apposition, calcification, and eruption. Aberrations in different stages of tooth development can result in unique manifestations both in primary and permanent dentitions. The fact that premaxilla is the predilection site for the occurrence of supernumerary teeth, talon cusp, dens invaginatus, and geminated teeth may suggest that the embryological development of premaxilla differ from other sites of the jaws. The dental abnormalities presented in this review are of great concern to dentist and parents because they create clinical, pathological and esthetic problems. Dental practitioner should be aware of the clinical sign, associated problems and treatment options for a given case. Key words:Double talon cusps, fusion, supernumerary, case report. PMID:25593664

  7. Origin of B chromosomes in Characidium alipioi (Characiformes, Crenuchidae and its relationship with supernumerary chromosomes in other Characidium species

    Directory of Open Access Journals (Sweden)

    Érica Alves Serrano

    2017-01-01

    Full Text Available B chromosomes are apparently dispensable components found in the genomes of many species that are mainly composed of repetitive DNA sequences. Among the numerous questions concerning B chromosomes, the origin of these elements has been widely studied. To date, supernumerary chromosomes have been identified in approximately 60 species of fish, including species of the genus Characidium Reinhardt, 1867 in which these elements appear to have independently originated. In this study, we used molecular cytogenetic techniques to investigate the origin of B chromosomes in a population of Characidium alipioi Travassos, 1955 and determine their relationship with the extra chromosomes of other species of the genus. The results showed that the B chromosomes of C. alipioi had an intraspecific origin, apparently originated independently in relation to the B chromosomes of C. gomesi Travassos, 1956 C. pterostictum Gomes, 1947 and C. oiticicai Travassos, 1967, since they do not share specific DNA sequences, as well as their possible ancestral chromosomes and belong to different phylogenetic clades. The shared sequences between the supernumerary chromosomes and the autosommal sm pair indicate the origin of these chromosomes.

  8. Storage Ring EDM Experiments

    Directory of Open Access Journals (Sweden)

    Semertzidis Yannis K.

    2016-01-01

    Full Text Available Dedicated storage ring electric dipole moment (EDM methods show great promise advancing the sensitivity level by a couple orders of magnitude over currently planned hadronic EDM experiments. We describe the present status and recent updates of the field.

  9. Fusion Rings for Quantum Groups

    DEFF Research Database (Denmark)

    Andersen, Henning Haahr; Stroppel, Catharina

    2012-01-01

    We study the fusion rings of tilting modules for a quantum group at a root of unity modulo the tensor ideal of negligible tilting modules. We identify them in type A with the combinatorial rings from [12] and give a similar description of the sp2n-fusion ring in terms of noncommutative symmetric...... functions. Moreover we give a presentation of all fusion rings in classical types as quotients of polynomial rings. Finally we also compute the fu- sion rings for type G2....

  10. Ring Bubbles of Dolphins

    Science.gov (United States)

    Shariff, Karim; Marten, Ken; Psarakos, Suchi; White, Don J.; Merriam, Marshal (Technical Monitor)

    1996-01-01

    The article discusses how dolphins create and play with three types of air-filled vortices. The underlying physics is discussed. Photographs and sketches illustrating the dolphin's actions and physics are presented. The dolphins engage in this behavior on their own initiative without food reward. These behaviors are done repeatedly and with singleminded effort. The first type is the ejection of bubbles which, after some practice on the part of the dolphin, turn into toroidal vortex ring bubbles by the mechanism of baroclinic torque. These bubbles grow in radius and become thinner as they rise vertically to the surface. One dolphin would blow two in succession and guide them to fuse into one. Physicists call this a vortex reconnection. In the second type, the dolphins first create an invisible vortex ring in the water by swimming on their side and waving their tail fin (also called flukes) vigorously. This vortex ring travels horizontally in the water. The dolphin then turns around, finds the vortex and injects a stream of air into it from its blowhole. The air "fills-out" the core of the vortex ring. Often, the dolphin would knock-off a smaller ring bubble from the larger ring (this also involves vortex reconnection) and steer the smaller ring around the tank. One other dolphin employed a few other techniques for planting air into the fluke vortex. One technique included standing vertically in the water with tail-up, head-down and tail piercing the free surface. As the fluke is waved to create the vortex ring, air is entrained from above the surface. Another technique was gulping air in the mouth, diving down, releasing air bubbles from the mouth and curling them into a ring when they rose to the level of the fluke. In the third type, demonstrated by only one dolphin, the longitudinal vortex created by the dorsal fin on the back is used to produce 10-15 foot long helical bubbles. In one technique she swims in a curved path. This creates a dorsal fin vortex since

  11. Dosage Effects of X and Y Chromosomes on Language and Social Functioning in Children with Supernumerary Sex Chromosome Aneuploidies: Implications for Idiopathic Language Impairment and Autism Spectrum Disorders

    Science.gov (United States)

    Lee, Nancy Raitano; Wallace, Gregory L.; Adeyemi, Elizabeth I.; Lopez, Katherine C.; Blumenthal, Jonathan D.; Clasen, Liv S.; Giedd, Jay N.

    2012-01-01

    Background: Supernumerary sex chromosome aneuploidies (X/Y-aneuploidies), the presence of extra X and/or Y chromosomes, are associated with heightened rates of language impairments and social difficulties. However, no single study has examined different language domains and social functioning in the same sample of children with tri-, tetra-, and…

  12. Saturn ring temperature changes before and after ring equinox

    Science.gov (United States)

    Spilker, Linda; Flandes, Alberto; Morishima, Ryuji; Leyrat, Cedric; Altobelli, Nicolas; Ferrari, Cecile; Brooks, Shawn; Pilorz, Stu

    2010-05-01

    The Cassini Composite infrared spectrometer (CIRS) retrieved the temperatures of Saturn's main rings at solar elevations ranging from 24 degrees to zero degrees at equinox (August 2009) as the sun traversed from the south to north side of the rings. Over this broad range of solar elevation the CIRS data show that the ring temperatures vary as much as 29K- 38K for the A ring, 22K-34K for the B ring and 18K-23K for the C ring. Interestingly the unlit sides of the rings show a similar decrease in temperature with the decreasing solar elevation. As equinox approached, the main rings cooled to their lowest temperatures measured to date. At equinox the solar input is very small and the primary heat sources for the rings are Saturn thermal and visible energy. Temperatures are almost identical for similar geometries on the north and south sides of the rings. The ring temperatures at equinox were: C ring, 55-75 K; B ring, 45-60 K; Cassini Division, 45 - 58 K; and A ring, 43 - 52 K. After Saturn equinox the solar elevation angle began to increase again and the temperatures on both the lit (north) and unlit (south) sides of the rings have begun to increase as well. Ring thermal models developed by Flandes and Morishima are able to reproduce most of the equinox temperatures observed by CIRS. Results before and after equinox will be presented. This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA and at CEA Saclay supported by the "Programme National de Planetologie". Copyright 2010 California Institute of Technology. Government sponsorship acknowledged.

  13. Antimüllerian hormone as a predictor of good-quality supernumerary blastocyst cryopreservation among women with levels <1 ng/mL versus 1-4 ng/mL.

    Science.gov (United States)

    Kavoussi, Shahryar K; Odenwald, Kate C; Boehnlein, Lynn M; Summers-Colquitt, Roxanne B; Pool, Thomas B; Swain, Jason E; Jones, Jeffrey M; Lindstrom, Mary J; Lebovic, Dan I

    2015-09-01

    To determine whether antimüllerian hormone (AMH) levels predict the availability of good-quality supernumerary blastocysts for cryopreservation. Retrospective study. Two fertility centers. First fresh IVF cycles (n = 247) grouped as follows: 40 women good-quality blastocysts cryopreserved on days 5 or 6 after retrieval. Supernumerary good-quality blastocysts for cryopreservation in relation to AMH levels. Among women good-quality blastocysts for cryopreservation between the groups with AMH good-quality blastocyst cryopreservation between groups with AMH good-quality supernumerary blastocysts available for cryopreservation. Copyright © 2015 The Authors. Published by Elsevier Inc. All rights reserved.

  14. Inorganic glass ceramic slip rings

    Science.gov (United States)

    Glossbrenner, E. W.; Cole, S. R.

    1972-01-01

    Prototypes of slip rings have been fabricated from ceramic glass, a material which is highly resistant to deterioration due to high temperature. Slip ring assemblies were not structurally damaged by mechanical tests and performed statisfactorily for 200 hours.

  15. 2-minute Gridded Global Relief Data (ETOPO2) v2

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Two-minute gridded global relief for both ocean and land areas are available in the ETOPO2v2 (2006) database. ETOPO2v2 replaced ETOPO2 (2001). The historic 2-minute...

  16. Econometric Assessment of "One Minute" Paper as a Pedagogic Tool

    Science.gov (United States)

    Das, Amaresh

    2010-01-01

    This paper makes an econometric testing of one-minute paper used as a tool to manage and assess instruction in my statistics class. One of our findings is that the one minute paper when I have tested it by using an OLS estimate in a controlled Vs experimental design framework is found to statistically significant and effective in enhancing…

  17. Alterations in the morphology of skeletal myofibres after 90 minutes ...

    African Journals Online (AJOL)

    Alterations in the morphology of skeletal myofibres after 90 minutes of ischaemia and '- 3 hours of reperfusion. M.A. Gregory, M. Mars. Abstract. Morphometric, light and electron microscopic methods were employed to determine whether skeletal myofibres were damaged by 90 minutes of tourniquet-mediated ischaemia.

  18. Alterations in the morphology of skeletal myofibres after 90 minutes ...

    African Journals Online (AJOL)

    1991-03-16

    Mar 16, 1991 ... M.A.GREGORY, M.MARS·. Summary. Morphometric, light and electron microscopic methods were employed to determine whether skeletal myofibres were damaged by 90 minutes of tourniquet-mediated ischaemia. Open biceps muscle biopsies were obtained before 90 minutes of upper limb tourniquet ...

  19. One-Minute Paper: A thinking centered assessment tool | Ashakiran ...

    African Journals Online (AJOL)

    A versatile assessment technique used in classroom for quick and simple feedback is 'One-Minute paper'. It provides real-time feedback from class and enables the teacher to find out if students have recognized the main points in a class session. The objectives of the study were to employ one-minute paper for ...

  20. Ring closure in actin polymers

    Energy Technology Data Exchange (ETDEWEB)

    Sinha, Supurna, E-mail: supurna@rri.res.in [Raman Research Institute, Bangalore 560080 (India); Chattopadhyay, Sebanti [Doon University, Dehradun 248001 (India)

    2017-03-18

    We present an analysis for the ring closure probability of semiflexible polymers within the pure bend Worm Like Chain (WLC) model. The ring closure probability predicted from our analysis can be tested against fluorescent actin cyclization experiments. We also discuss the effect of ring closure on bend angle fluctuations in actin polymers. - Highlights: • Ring closure of biopolymers. • Worm like chain model. • Predictions for experiments.

  1. O-Ring-Testing Fixture

    Science.gov (United States)

    Turner, James E.; Mccluney, D. Scott

    1990-01-01

    Fixture used to evalute properties of O-rings of various materials. Hydraulic actuator positions plug in housing, creating controlled, variable gap in O-ring glands formed by grooves in plug and by inner wall of housing. Creates controlled axial and radial gaps between sealing surfaces around ring so effectiveness of material in maintaining seal determined under dynamic conditions.

  2. Clean elements in abelian rings

    Indian Academy of Sciences (India)

    equivalent to being clean for an abelian ring is 'topologically boolean'. In line with [1] we say that a ring R (not necessarily commutative) is right (resp. left) topologically boolean, or a right (resp. left) tb-ring for short, if for every pair of distinct maximal right (resp. left) ideals of R there is an idempotent in exactly one of them.

  3. Ring closure in actin polymers

    OpenAIRE

    Sinha, Supurna; Chattopadhyay, Sebanti

    2017-01-01

    We present an analysis for the ring closure probability of semiflexible polymers within the pure bend Worm Like Chain (WLC) model. The ring closure probability predicted from our analysis can be tested against fluorescent actin cyclization experiments.We also discuss the effect of ring closure on bend angle fluctuations in actin polymers.

  4. Non-Commutative Ring Theory

    CERN Document Server

    López-Permouth, Sergio

    1990-01-01

    The papers of this volume share as a common goal the structure and classi- fication of noncommutative rings and their modules, and deal with topics of current research including: localization, serial rings, perfect endomorphism rings, quantum groups, Morita contexts, generalizations of injectivitiy, and Cartan matrices.

  5. Saturn Ring Observer

    Science.gov (United States)

    Spilker, T. R.

    2001-01-01

    Answering fundamental questions about ring particle characteristics, and individual and group behavior, appears to require close-proximity (a few km) observations. Saturn's magnificent example of a ring system offers a full range of particle sizes, densities, and behaviors for study, so it is a natural choice for such detailed investigation. Missions implementing these observations require post-approach Delta(V) of approximately 10 km/s or more, so past mission concepts called upon Nuclear Electric Propulsion. The concept described here reduces the propulsive Delta(V) requirement to as little as 3.5 km/s, difficult but not impossible for high-performance chemical propulsion systems. Additional information is contained in the original extended abstract.

  6. Satellite Rings Movie

    Science.gov (United States)

    2000-01-01

    This brief movie clip (of which the release image is a still frame), taken by NASA's Cassini spacecraft as it approached Jupiter, shows the motions, over a 16 hour-period, of two satellites embedded in Jupiter's ring. The moon Adrastea is the fainter of the two, and Metis the brighter. Images such as these will be used to refine the orbits of the two bodies.The movie was made from images taken during a 40-hour sequence of the Jovian ring on December 11, 2000.Cassini is a cooperative mission of NASA, the European Space Agency and the Italian Space Agency. JPL, a division of the California Institute of Technology in Pasadena, manages Cassini for NASA's Office of Space Science, Washington, D.C.

  7. Eelgrass fairy rings

    DEFF Research Database (Denmark)

    Borum, Jens; Raun, Ane-Marie Løvendahl; Hasler-Sheetal, Harald

    2014-01-01

    Distinct ‘fairy rings’ consisting of narrow fringes of eelgrass (Zostera marina l.) expand radially over a bottom of chalk plates outside the calcium carbon- ate cliffs of the island of Møn, Denmark. We conducted a survey to evaluate possible explanations for the formation of the rings and, more...... sulfide accumulating in the sediment due to low iron availability in the carbonate-rich environment....

  8. Uranus rings and two moons

    Science.gov (United States)

    1986-01-01

    Voyager 2 has discovered two 'shepherd' satellites associated with the rings of Uranus. The two moons -- designated 1986U7 and 1986U8 -- are seen here on either side of the bright epsilon ring; all nine of the known Uranian rings are visible. The image was taken Jan. 21, 1986, at a distance of 4.1 million kilometers (2.5 million miles) and resolution of about 36 km (22 mi). The image was processed to enhance narrow features. The epsilon ring appears surrounded by a dark halo as a result of this processing; occasional blips seen on the ring are also artifacts. Lying inward from the epsilon ring are the delta, gamma and eta rings; then the beta and alpha rings; and finally the barely visible 4, 5 and 6 rings. The rings have been studied since their discovery in 1977, through observations of how they diminish the light of stars they pass in front of. This image is the first direct observation of all nine rings in reflected sunlight. They range in width from about 100 km (60 mi) at the widest part of the epsilon ring to only a few kilometers for most of the others. The discovery of the two ring moons 1986U7 and 1986U8 is a major advance in our understanding of the structure of the Uranian rings and is in good agreement with theoretical predictions of how these narrow rings are kept from spreading out. Based on likely surface brightness properties, the moons are of roughly 2O- and 3O-km diameter, respectively. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.

  9. The Feasibility of Six-Minute and Two-Minute Walk Tests in In-patient Geriatric Rehabilitation

    Science.gov (United States)

    Brooks, Dina; Davis, Aileen M.; Naglie, Gary

    2007-01-01

    Objective: To evaluate the feasibility of the 6-minute and 2-minute walk tests in frail older persons. Design: Pre/post-design with measures at admission and discharge to in-patient geriatric rehabilitation. Participants: Fifty-two subjects (35 women, 17 men; age 80 plus or minus 8 years). Results: Only 1 of the first 8 subjects could complete a…

  10. A potential kidney-bone axis involved in the rapid minute-to-minute regulation of plasma Ca2+

    DEFF Research Database (Denmark)

    Nordholm, Anders; Mace, Maria L; Gravesen, Eva

    2015-01-01

    BACKGROUND: Understanding the regulation of mineral homeostasis and function of the skeleton as buffer for Calcium and Phosphate has regained new interest with introduction of the syndrome "Chronic Kidney Disease-Mineral and Bone Disorder"(CKD-MBD). The very rapid minute-to-minute regulation of p...

  11. O-Ring-Testing Fixture

    Science.gov (United States)

    Turner, James E.; Mccluney, D. Scott

    1991-01-01

    Fixture tests O-rings for sealing ability under dynamic conditions after extended periods of compression. Hydraulic cylinder moves plug in housing. Taper of 15 degrees on plug and cavity of housing ensures that gap created between O-ring under test and wall of cavity. Secondary O-rings above and below test ring maintain pressure applied to test ring. Evaluates effects of variety of parameters, including temperature, pressure, rate of pressurization, rate and magnitude of radial gap movement, and pretest compression time.

  12. Gain of FAM123B and ARHGEF9 in an Obese Man with Intellectual Disability, Congenital Heart Defects and Multiple Supernumerary Ring Chromosomes

    National Research Council Canada - National Science Library

    Hochstenbach, R; Gijn, M.E. van; Krijtenburg, P.J; Raemakers, R; Slot, R. van 't; Renkens, I; Eleveld, M.J; Smagt, J.J. van der; Poot, M

    ...) was present in 84-89% of cells in the various tissues examined, lacks the XIST gene, but contains FAM123B, a potential dosage-sensitive candidate gene for congenital cardiac abnormalities, and ARHGEF9, a candidate gene...

  13. Mass of Saturn's A ring

    Science.gov (United States)

    Horn, L. J.; Russell, C. T.

    1993-01-01

    The mass of Saturn's A ring is reestimated using the behavior of spiral density waves embedded in the ring. The Voyager photopolarimeter (PPS) observed the star delta-Scorpii as it was occulted by Saturn's rings during the Voyager 2 flyby of Saturn in 1981 producing a radial profile of the rings. We examined forty spiral density waves in the Voyager PPS data of the A ring including 10 weaker waves that have not been previously analyzed by means of an autoregressive power spectral technique called Burg. The strengths of this new method for ring studies are that weaker, less extended waves are easily detected and characterized. This method is also the first one which does not require precise knowledge of the resonance location and phase of the wave in order to calculate the surface mass density. Uncertainties of up to 3 km are present in the currently available radial scales for Saturn's rings.

  14. Revascularization of an impacted, immature dilacerated permanent maxillary central incisor associated with odontoma and a supernumerary tooth

    Directory of Open Access Journals (Sweden)

    Priya Subramaniam

    2013-01-01

    Full Text Available To intentionally replant an impacted immature permanent maxillary central incisor in the mixed dentition period followed by revascularization in order to achieve apical root closure. A 9-year-old boy presented with retained maxillary left primary incisors. Radiographic evaluation revealed the presence of a supernumerary tooth and an odontoma associated with an impacted permanent maxillary left central incisor, having root dilaceration. Treatment included surgical removal of mesiodens and odontoma. The impacted dilacerated permanent central incisor was removed and intentionally replanted, followed by revascularization of pulp. During the follow-up, root end closure with narrowing of canal space was observed, patient has been asymptomatic and the tooth remains vital. Revascularization of the immature reimplanted tooth showed continued root development and thickening of the lateral dentinal walls through deposition of new hard tissue and narrowing of the canal space.

  15. Sir John Herschel and the Stability of Saturn's Ring

    CERN Document Server

    Whiting, Alan B

    2011-01-01

    In a pioneering exposition of mathematical astronomy for the public, Sir John Herschel attributed the stability of the ring of Saturn to its being eccentric with respect to the planet and lopsided (asymmetric in mass) by a minute amount. Tracing the sources and effects of this error reveals several lessons of general relevance to science: on the formulation and interpretation of calculations, the use of cutting-edge observations and the combining of observations with theory. I emphasise the phenomenon of reinforcing errors.

  16. Heritability and genome-wide association mapping for supernumerary teats in French Alpine and Saanen dairy goats.

    Science.gov (United States)

    Martin, Pauline; Palhière, Isabelle; Tosser-Klopp, Gwenola; Rupp, Rachel

    2016-11-01

    This paper reports a quantitative genetics and genomic analysis of undesired presence of supernumerary teats (SNT) in goats. Supernumerary teats are a problem in goat breeding as they can considerably impede machine milking efficiency, leading to increased milking time and injury. This phenotype has routinely been recorded for the past 15 yr in French Alpine and Saanen goats. Around 4% of the females had been assigned the SNT phenotype and consequently could not be included in the breeding program as elite animals. The heritability of this binary trait, estimated by applying linear logistic polygenic models to 32,908 Alpine and 23,217 Saanen females, was 0.40 and 0.44, respectively. A genome-wide association study was implemented using a daughter design composed of 810 Saanen goats sired by 9 artificial insemination bucks and 1,185 Alpine goats sired by 11 bucks, genotyped with the goatSNP50 chip (Illumina Inc., San Diego, CA). This association study was based on logistic polygenic models, one with separately taken single nucleotide polymorphisms and the other with haplotypes as fixed effects. The 2 breeds were analyzed together and separately. No region was found to be significant at the genome level, but 17 regions on 10 chromosomes were significant at the chromosome level. These signals were always only slightly above the chromosome significance threshold and only a few of them overlapped across analyses. No evidence of segregation of a major gene in our Saanen and Alpine populations was observed, suggesting that SNT presence is inherited in a polygenic fashion. This conclusion regarding SNT determinism agrees with recent association analyses in cattle, and one locus was even found in an orthologous region. The possibility of applying markers-based selection on the SNT trait is therefore unlikely, but, as this trait is heritable and routinely recorded, it could be managed by attributing a dedicated estimated breeding value. Copyright © 2016 American Dairy

  17. Rainbows, supernumerary rainbows and interference effects in the angular scattering of chemical reactions: an investigation using Heisenberg's S matrix programme.

    Science.gov (United States)

    Shan, Xiao; Xiahou, Chengkui; Connor, J N L

    2018-01-03

    In earlier research, we have demonstrated that broad "hidden" rainbows can occur in the product differential cross sections (DCSs) of state-to-state chemical reactions. Here we ask the question: can pronounced and localized rainbows, rather than broad hidden ones, occur in reactive DCSs? Further motivation comes from recent measurements by H. Pan and K. Liu, J. Phys. Chem. A, 2016, 120, 6712, of a "bulge" in a reactive DCS, which they conjecture is a rainbow. Our theoretical approach uses a "weak" version of Heisenberg's scattering matrix program (wHSMP) introduced by X. Shan and J. N. L. Connor, Phys. Chem. Chem. Phys., 2011, 13, 8392. This wHSMP uses four general physical principles for chemical reactions to suggest simple parameterized forms for the S matrix; it does not employ a potential energy surface. We use a parameterization in which the modulus of the S matrix is a smooth-step function of the total angular momentum quantum number, J, and (importantly) its phase is a cubic polynomial in J. We demonstrate for a Legendre partial wave series (PWS) the existence of pronounced rainbows, supernumerary rainbows, and other interference effects, in reactive DCSs. We find that reactive rainbows can be more complicated in their structure than the familiar rainbows of elastic scattering. We also analyse the angular scattering using Nearside-Farside (NF) PWS theory and NF PWS Local Angular Momentum (LAM) theory, including resummations of the PWS. In addition, we apply full and NF asymptotic (semiclassical) rainbow theories to the PWS - in particular, the uniform Airy and transitional Airy approximations for the farside scattering. This lets us prove that structure in the DCSs are indeed rainbows, supernumerary rainbows as well as other interference effects.

  18. Jobs within a 30-minute transit ride - Service

    Data.gov (United States)

    U.S. Environmental Protection Agency — This mapping service summarizes the total number of jobs that can be reached within 30 minutes by transit. EPA modeled accessibility via transit by calculating total...

  19. Six-minute-walk test in chronic obstructive pulmonary disease

    DEFF Research Database (Denmark)

    Polkey, Michael I; Spruit, Martijn A; Edwards, Lisa D

    2013-01-01

    Outcomes other than spirometry are required to assess nonbronchodilator therapies for chronic obstructive pulmonary disease. Estimates of the minimal clinically important difference for the 6-minute-walk distance (6MWD) have been derived from narrow cohorts using nonblinded intervention....

  20. NOS CO-OPS Water Level Data, Preliminary, 6-Minute

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset has recent, preliminary (not quality-controlled), 6-minute, water level (tide) data from NOAA NOS Center for Operational Oceanographic Products and...

  1. NOS CO-OPS Water Level Data, Preliminary, 1-Minute

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset has recent, preliminary (not quality-controlled), 1-minute, water level (tide) data from NOAA NOS Center for Operational Oceanographic Products and...

  2. NOS CO-OPS Water Level Data, Verified, 6-Minute

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset has verified (quality-controlled), 6-minute, water level (tide) data from NOAA NOS Center for Operational Oceanographic Products and Services (CO-OPS)....

  3. 10 CFR 9.108 - Certification, transcripts, recordings and minutes.

    Science.gov (United States)

    2010-01-01

    ... transcription as provided in § 9.14. The Secretary shall maintain a complete verbatim copy of the transcript, a...). Copies of such transcript, or minutes, or a transcription of such recording disclosing the identity of...

  4. Ovarian dysgenesis in an alpaca with a minute chromosome 36.

    Science.gov (United States)

    Fellows, Elizabeth; Kutzler, Michelle; Avila, Felipe; Das, Pranab J; Raudsepp, Terje

    2014-01-01

    A 4-year-old female alpaca (Lama pacos [LPA]) was presented to the Oregon State Veterinary Teaching Hospital for failure to display receptive behavior to males. Although no abnormalities were found on physical examination, transrectal ultrasonographic examination of the reproductive tract revealed uterine hypoplasia and ovarian dysgenesis. Cytogenetic analysis demonstrated a normal female 74,XX karyotype with 1 exceptionally small (minute) homologue of autosome LPA36. Chromosome analysis by Giemsa staining and DAPI- and C-banding revealed that the minute LPA36 was submetacentric, AT-rich, and largely heterochromatic. Because of the small size and lack of molecular markers, it was not possible to identify the origin of the minute. There is a need to improve molecular cytogenetic tools to further study the phenomenon of this minute chromosome and its relation to female reproduction in alpacas and llamas. © The American Genetic Association. 2012. All rights reserved. For permissions, please email: journals.permissions@oup.com.

  5. Predicting Student Performance Using Online One-Minute Papers

    OpenAIRE

    Lee E. Erickson; Patricia A. Erickson

    2013-01-01

    One-minute papers are often used to encourage students to think and write briefly about their own learning, because teachers believe that metacognition and writing help students to learn. The proportion of online one-minute papers that students submit, however, has not previously been used to explain student achievement in economics. This paper shows that the completion rate is a very significant predictor of student performance after controlling for other variables already noted in the liter...

  6. Practical math success in 20 minutes a day

    CERN Document Server

    2013-01-01

    LearningExpress's 20 Minutes a Day guides make challenging subject areas more accessible by tackling one small part of a larger topic and building upon that knowledge with each passing day. Practical Math Success in 20 Minutes a Day features: A walkthrough of the fundamental concepts of pre-algebra, algebra, and geometry Hundreds of practice exercises for essential practice A posttest, which reveals your progress Access to a free, instantly scored online practice test

  7. Viscosity of ring polymer melts

    KAUST Repository

    Pasquino, Rossana

    2013-10-15

    We have measured the linear rheology of critically purified ring polyisoprenes, polystyrenes, and polyethyleneoxides of different molar masses. The ratio of the zero-shear viscosities of linear polymer melts η0,linear to their ring counterparts η0,ring at isofrictional conditions is discussed as a function of the number of entanglements Z. In the unentangled regime η0,linear/η 0,ring is virtually constant, consistent with the earlier data, atomistic simulations, and the theoretical expectation η0,linear/ η0,ring = 2. In the entanglement regime, the Z-dependence of ring viscosity is much weaker than that of linear polymers, in qualitative agreement with predictions from scaling theory and simulations. The power-law extracted from the available experimental data in the rather limited range 1 < Z < 20, η0,linear/η0,ring ∼ Z 1.2±0.3, is weaker than the scaling prediction (η0,linear/η0,ring ∼ Z 1.6±0.3) and the simulations (η0,linear/ η0,ring ∼ Z2.0±0.3). Nevertheless, the present collection of state-of-the-art experimental data unambiguously demonstrates that rings exhibit a universal trend clearly departing from that of their linear counterparts, and hence it represents a major step toward resolving a 30-year-old problem. © 2013 American Chemical Society.

  8. Fusion Rings for Quantum Groups

    DEFF Research Database (Denmark)

    Andersen, Henning Haahr; Stroppel, Catharina

    2014-01-01

    We study the fusion rings of tilting modules for a quantum group at a root of unity modulo the tensor ideal of negligible tilting modules. We identify them in type A with the combinatorial rings from Korff, C., Stroppel, C.: The sl(ˆn)k-WZNW fusion ring: a combinato-rial construction and a realis......We study the fusion rings of tilting modules for a quantum group at a root of unity modulo the tensor ideal of negligible tilting modules. We identify them in type A with the combinatorial rings from Korff, C., Stroppel, C.: The sl(ˆn)k-WZNW fusion ring: a combinato-rial construction...... and a realisation as quotient of quantum cohomology. Adv. Math. 225(1), 200–268, (2010) and give a similar description of the sp2n-fusion ring in terms of non-commutative symmetric functions. Moreover we give a presentation of all fusion rings in classical types as quotients of polynomial rings. Finally we also...... compute the fusion rings for type G2....

  9. Ring Image Analyzer

    Science.gov (United States)

    Strekalov, Dmitry V.

    2012-01-01

    Ring Image Analyzer software analyzes images to recognize elliptical patterns. It determines the ellipse parameters (axes ratio, centroid coordinate, tilt angle). The program attempts to recognize elliptical fringes (e.g., Newton Rings) on a photograph and determine their centroid position, the short-to-long-axis ratio, and the angle of rotation of the long axis relative to the horizontal direction on the photograph. These capabilities are important in interferometric imaging and control of surfaces. In particular, this program has been developed and applied for determining the rim shape of precision-machined optical whispering gallery mode resonators. The program relies on a unique image recognition algorithm aimed at recognizing elliptical shapes, but can be easily adapted to other geometric shapes. It is robust against non-elliptical details of the image and against noise. Interferometric analysis of precision-machined surfaces remains an important technological instrument in hardware development and quality analysis. This software automates and increases the accuracy of this technique. The software has been developed for the needs of an R&TD-funded project and has become an important asset for the future research proposal to NASA as well as other agencies.

  10. Ring current and radiation belts

    Science.gov (United States)

    Williams, D. J.

    1987-01-01

    Studies performed during 1983-1986 on the ring current, the injection boundary model, and the radiation belts are discussed. The results of these studies yielded the first observations on the composition and charge state of the ring current throughout the ring-current energy range, and strong observational support for an injection-boundary model accounting for the origins of radiation-belt particles, the ring current, and substorm particles observed at R less than about 7 earth radii. In addition, the results have demonstrated that the detection of energetic neutral atoms generated by charge-exchange interactions between the ring current and the hydrogen geocorona can provide global images of the earth's ring current and its spatial and temporal evolution.

  11. Filtration on a Ring Make a Quasi Valuation or Valuation Ring

    Directory of Open Access Journals (Sweden)

    Mohammad Hassan Anjom SHoa

    2014-06-01

    Full Text Available In this paper we show that if R is a filtered ring then we can define a quasi valuation ring. And there exists a valuation ring if R is some kind of filtered ring. Then we prove some properties and relations between filtered ring and quasi valuation ring and valuation ring.

  12. Saturn's Rings and Associated Ring Plasma Cavity: Evidence for Slow Ring Erosion

    Science.gov (United States)

    Farrell, W. M.; Kurth, W. S.; Gurnett, D. A.; Persoon, A. M.; MacDowall, R. J.

    2017-01-01

    We re-examine the radio and plasma wave observations obtained during the Cassini Saturn orbit insertion period, as the spacecraft flew over the northern ring surface into a radial distance of 1.3 Rs (over the C-ring). Voyager era studies suggest the rings are a source of micro-meteoroid generated plasma and dust, with theorized peak impact-created plasma outflows over the densest portion of the rings (central B-ring). In sharp contrast, the Cassini Radio and Plasma Wave System (RPWS) observations identify the presence of a ring-plasma cavity located in the central portion of the B-ring, with little evidence of impact-related plasma. While previous Voyager era studies have predicted unstable ion orbits over the C- ring, leading to field-aligned plasma transport to Saturns ionosphere, the Cassini RPWS observations do not reveal evidence for such instability-created plasma fountains. Given the passive ring loss processes observed by Cassini, we find that the ring lifetimes should extend >10(exp 9) years, and that there is limited evidence for prompt destruction (loss in <100 Myrs).

  13. Saturn's rings and associated ring plasma cavity: Evidence for slow ring erosion

    Science.gov (United States)

    Farrell, W. M.; Kurth, W. S.; Gurnett, D. A.; Persoon, A. M.; MacDowall, R. J.

    2017-08-01

    We re-examine the radio and plasma wave observations obtained during the Cassini Saturn orbit insertion period, as the spacecraft flew over the northern ring surface into a radial distance of 1.3 Rs (over the C-ring). Voyager era studies suggest the rings are a source of micro-meteoroid generated plasma and dust, with theorized peak impact-created plasma outflows over the densest portion of the rings (central B-ring). In sharp contrast, the Cassini Radio and Plasma Wave System (RPWS) observations identify the presence of a ring-plasma cavity located in the central portion of the B-ring, with little evidence of impact-related plasma. While previous Voyager era studies have predicted unstable ion orbits over the C-ring, leading to field-aligned plasma transport to Saturn's ionosphere, the Cassini RPWS observations do not reveal evidence for such instability-created plasma 'fountains'. Given the passive ring loss processes observed by Cassini, we find that the ring lifetimes should extend >109 years, and that there is limited evidence for prompt destruction (loss in <100 Myrs).

  14. Predictors of 6-minute walk test and 12-minute walk/run test in obese children and adolescents.

    Science.gov (United States)

    Calders, Patrick; Deforche, Benedicte; Verschelde, Sabine; Bouckaert, Jacques; Chevalier, Frederic; Bassle, Eddy; Tanghe, Ann; De Bode, Patrick; Franckx, Hilde

    2008-05-01

    The purpose of this study was to identify predictors of the distance achieved during a 6-minute walk test and a 12-minute walk/run test (Cooper test) in obese children and adolescents and to evaluate the influence of a residential treatment on the association of these predictors with the distance. A search of the Revalidation Centre Zeepreventorium (De Haan, Belgium) medical records database of all children and adolescents (age 10 to 18 yrs) treated for obesity between September 2003 and February 2006, revealed 65 charts with all relevant data (anthropometrical, maximal graded exercise, lung function, 6-minute walk test and 12-minute walk/run test) at admission as well as after 3 months treatment. The multidisciplinary treatment has a positive influence on anthropometrical variables, endurance capacity, vital capacity, and residual volume (p run test is correlated with all anthropometrical data and peak VO2 (p run test at admission. In obese children and adolescents BMI z-score is the most dominant predictor of the variability in performances on the 6-minute walk test and the 12-minute walk/run test at admission as well as after 3 months of treatment.

  15. Partial trisomy of chromosome 22 resulting from a supernumerary marker chromosome 22 in a child with features of cat eye syndrome.

    Science.gov (United States)

    Bélien, Valérie; Gérard-Blanluet, Marion; Serero, Stéphane; Le Dû, Nathalie; Baumann, Clarisse; Jacquemont, Marie-Line; Dupont, Céline; Krabchi, Kada; Drunat, Séverine; Elbez, Annie; Janaud, Jean-Claude; Benzacken, Brigitte; Verloes, Alain; Tabet, Anne-Claude; Aboura, Azzedine

    2008-07-15

    Small supernumerary marker chromosomes are present in about 0.05% of the human population. In approximately 28% of persons with these markers (excluding the approximately 60% derived from one of the acrocentric chromosomes), an abnormal phenotype is observed. We report on a 3-month-old girl with intrauterine growth retardation, craniofacial features, hypotonia, partial coloboma of iris and total anomalous pulmonary venous return. Cytogenetic analysis showed the presence of a supernumerary marker chromosome, identified by fluorescence in situ hybridization as part of chromosome 22, and conferring a proximal partial trisomy 22q22.21, not encompassing the DiGeorge critical region (RP11-154H4 + , TBX1-). This observation adds new information relevant to cat eye syndrome and partial trisomy of 22q. 2008 Wiley-Liss, Inc.

  16. Ground Movement in SSRL Ring

    Energy Technology Data Exchange (ETDEWEB)

    Sunikumar, Nikita; /UCLA /SLAC

    2011-08-25

    Users of the Stanford Synchrotron Radiation Lightsource (SSRL) are being affected by diurnal motion of the synchrotron's storage ring, which undergoes structural changes due to outdoor temperature fluctuations. In order to minimize the effects of diurnal temperature fluctuations, especially on the vertical motion of the ring floor, scientists at SSRL tried three approaches: painting the storage ring white, covering the asphalt in the middle of the ring with highly reflective Mylar and installing Mylar on a portion of the ring roof and walls. Vertical motion in the storage ring is measured by a Hydrostatic Leveling System (HLS), which calculates the relative height of water in a pipe that extends around the ring. The 24-hr amplitude of the floor motion was determined using spectral analysis of HLS data, and the ratio of this amplitude before and after each experiment was used to quantitatively determine the efficacy of each approach. The results of this analysis showed that the Mylar did not have any significant effect on floor motion, although the whitewash project did yield a reduction in overall HLS variation of 15 percent. However, further analysis showed that the reduction can largely be attributed to a few local changes rather than an overall reduction in floor motion around the ring. Future work will consist of identifying and selectively insulating these local regions in order to find the driving force behind diurnal floor motion in the storage ring.

  17. n-X-Coherent Rings

    OpenAIRE

    Bennis, Driss

    2010-01-01

    This paper unifies several generalizations of coherent rings in one notion. Namely, we introduce $n$-$\\mathscr{X}$-coherent rings, where $\\mathscr{X}$ is a class of modules and $n$ is a positive integer, as those rings for which the subclass $\\mathscr{X}_n$ of $n$-presented modules of $\\mathscr{X}$ is not empty, and every module in $\\mathscr{X}_n$ is $n+1$-presented. Then, for each particular class $\\mathscr{X}$ of modules, we find correspondent relative coherent rings. Our main aim is to sho...

  18. Integrated Ring Resonators The Compendium

    CERN Document Server

    Rabus, Dominik G

    2007-01-01

    The optical filter, which has emerged in the last few years in integrated optics, is resonator based. Ring-resonator filters do not require facets or gratings for optical feedback and are thus particularly suited for monolithic integration with other components. Ring resonators find applications not only in optical networks, but also as sensors. The required passband shape of ring resonator-filters can be custom designed by the use of configurations of various ring coupled resonators. This book describes the current state-of-the-art on these devices with respect to design, fabrication and application.

  19. Exploring Market State and Stock Interactions on the Minute Timescale.

    Science.gov (United States)

    Tan, Lei; Chen, Jun-Jie; Zheng, Bo; Ouyang, Fang-Yan

    2016-01-01

    A stock market is a non-stationary complex system. The stock interactions are important for understanding the state of the market. However, our knowledge on the stock interactions on the minute timescale is limited. Here we apply the random matrix theory and methods in complex networks to study the stock interactions and sector interactions. Further, we construct a new kind of cross-correlation matrix to investigate the correlation between the stock interactions at different minutes within one trading day. Based on 50 million minute-to-minute price data in the Shanghai stock market, we discover that the market states in the morning and afternoon are significantly different. The differences mainly exist in three aspects, i.e. the co-movement of stock prices, interactions of sectors and correlation between the stock interactions at different minutes. In the afternoon, the component stocks of sectors are more robust and the structure of sectors is firmer. Therefore, the market state in the afternoon is more stable. Furthermore, we reveal that the information of the sector interactions can indicate the financial crisis in the market, and the indicator based on the empirical data in the afternoon is more effective.

  20. Exploring Market State and Stock Interactions on the Minute Timescale.

    Directory of Open Access Journals (Sweden)

    Lei Tan

    Full Text Available A stock market is a non-stationary complex system. The stock interactions are important for understanding the state of the market. However, our knowledge on the stock interactions on the minute timescale is limited. Here we apply the random matrix theory and methods in complex networks to study the stock interactions and sector interactions. Further, we construct a new kind of cross-correlation matrix to investigate the correlation between the stock interactions at different minutes within one trading day. Based on 50 million minute-to-minute price data in the Shanghai stock market, we discover that the market states in the morning and afternoon are significantly different. The differences mainly exist in three aspects, i.e. the co-movement of stock prices, interactions of sectors and correlation between the stock interactions at different minutes. In the afternoon, the component stocks of sectors are more robust and the structure of sectors is firmer. Therefore, the market state in the afternoon is more stable. Furthermore, we reveal that the information of the sector interactions can indicate the financial crisis in the market, and the indicator based on the empirical data in the afternoon is more effective.

  1. Management of Developing Anterior Malocclusion due to SupernumeraryTooth with Preventive and Intercep-tive Approach: A 1½ Year Case Study

    Science.gov (United States)

    Kambalimath, HV; Banda, Naveen Reddy

    2010-01-01

    ABSTRACT Variety of clinical complications occurs due to the presence of supernumerary teeth, especially mesiodens. It may result in impaction of one or both central incisors which in turn may lead to a variety of malocclusions. Timely intervention not only prevents malocclusion but also the time taken for corrective orthodontics. A complete case report of developing mesiodens’ tooth germ resulting in malocclusion including treatment in 1½ year period is presented. PMID:27507922

  2. Distances in generalized Double Rings and Degree Three Chordal Rings

    DEFF Research Database (Denmark)

    Pedersen, Jens Myrup; Riaz, Muhammad Tahir; Madsen, Ole Brun

    2005-01-01

    Generalized Double Rings (N2R) are compared to Degree Three Chordal Rings (CR) in terms of average distance, diameter, k-average distance and k-diameter. For each number of nodes, structures of each class are chosen to minimize diameter and average distance, an approach which is shown to result...

  3. Distances in Generalized Double Rings and Degree Three Chordal Rings

    DEFF Research Database (Denmark)

    Pedersen, Jens Myrup; Riaz, Muhammad Tahir; Madsen, Ole Brun

    2004-01-01

    Generalized Double Rings (N2R) are compared to Degree Three Chordal Rings (CR) in terms of average distance, diameter, k-average distance and k-diameter. For each number of nodes, structures of each class are chosen to minimize diameter and average distance, an approach which is shown to result...

  4. RING E3 ligases

    DEFF Research Database (Denmark)

    Cho, Seok Keun; Ryu, Moon Young; Kim, Jong Hum

    2017-01-01

    Plants are constantly exposed to a variety of abiotic stresses, such as drought, heat, cold, flood, and salinity. To survive under such unfavorable conditions, plants have evolutionarily developed their own resistant-mechanisms. For several decades, many studies have clarified specific stress...... response pathways of plants through various molecular and genetic studies. In particular, it was recently discovered that ubiquitin proteasome system (UPS), a regulatory mechanism for protein turn over, is greatly involved in the stress responsive pathways. In the UPS, many E3 ligases play key roles...... in recognizing and tethering poly-ubiquitins on target proteins for subsequent degradation by the 26S proteasome. Here we discuss the roles of RING ligases that have been defined in related to abiotic stress responses in plants....

  5. Cytogenetic and molecular analysis of a ring (21) in a patient with partial trisomy 21 and megakaryocytic leukemia

    Energy Technology Data Exchange (ETDEWEB)

    Palmer, C.G.; Bull, M.; Breitfeld, P. [Indiana Univ., Indianapolis, IN (United States)] [and others

    1994-09-01

    We describe a patient with an asymmetrical double ring 21 in mosaic form, 45,XX, -21/46,XX, -21, +r(21) (q22.11{yields}p11.2::q11.1{yields}q22.3), who has limited manifestations of Down`s syndrome and who developed acute myelofibrosis and megakaryocytic leukemia (AMKL), M7, a hematologic disorder particularly common in Down`s syndrome patients. In situ hybridization studies (gene dosage and DNA polymorphism analysis) show that the ring chromosome carries a duplicated region which extends from D21S258 on the centromeric side and includes marker D21S1245 on the telomeric side, but does not include the region from PFKL and ITGB2 through the telomere. FISH studies indicate two sizes of ring 21 in the patient. The origin of the supernumerary chromosome 21 in the proband was paternal; furthermore, the r(21) was probably formed post-zygotically. Included in the duplicated segment are the candidate genes for leukemia AML-1, ETS2 and ERG. If disomic homozygosity is important in the development of AMKL in the proband, the gene responsible maps either between the centromere and D21S11 or between D21S1239 and D21S1245.

  6. The eRHIC Ring-Ring Collider Design

    CERN Document Server

    Wang, Fuhua; Beebe-Wang, Joanne; Deshpande, Abhay A; Farkhondeh, Manouchehr; Franklin, Wilbur; Graves, William; Litvinenko, Vladimir N; MacKay, William W; Milner, Richard; Montag, Christoph; Ozaki, Satoshi; Parker, Brett; Peggs, Steve; Ptitsyn, Vadim; Roser, Thomas; Tepikian, Steven; Trbojevic, Dejan; Tschalär, C; Wang, Dong; Zolfaghari, Abbasali; Zwart, Townsend; van der Laan, Jan

    2005-01-01

    The eRHIC ring-ring collider is the main design option of the future lepton-ion collider at Brookhaven National Laboratory. We report the revisions of the ring-ring collider design features to the baseline design presented in the eRHIC Zeroth Design Report (ZDR). These revisions have been made during the past year. They include changes of the interaction region which are required from the modifications in the design of the main detector. They also include changes in the lepton storage ring for high current operations as a result of better understandings of beam-beam interaction effects. The updated collider luminosity and beam parameters also take into account a more accurate picture of current and future operational aspects of RHIC.

  7. Clean elements in abelian rings

    Indian Academy of Sciences (India)

    Let be a ring with identity. An element in is said to be clean if it is the sum of a unit and an idempotent. is said to be clean if all of its elements are clean. If every idempotent in is central, then is said to be abelian. In this paper we obtain some conditions equivalent to being clean in an abelian ring.

  8. Code–checkable group rings

    Directory of Open Access Journals (Sweden)

    Noha Abdelghany

    2017-01-01

    Full Text Available A code over a group ring is defined to be a submodule of that group ring. For a code $C$ over a group ring $RG$, $C$ is said to be checkable if there is $v\\in RG$ such that {$C=\\{x\\in RG: xv=0\\}$}. In \\cite{r2}, Jitman et al. introduced the notion of code-checkable group ring. We say that a group ring $RG$ is code-checkable if every ideal in $RG$ is a checkable code. In their paper, Jitman et al. gave a necessary and sufficient condition for the group ring $\\mathbb{F}G$, when $\\mathbb{F}$ is a finite field and $G$ is a finite abelian group, to be code-checkable. In this paper, we give some characterizations for code-checkable group rings for more general alphabet. For instance, a finite commutative group ring $RG$, with $R$ is semisimple, is code-checkable if and only if $G$ is $\\pi'$-by-cyclic $\\pi$; where $\\pi$ is the set of noninvertible primes in $R$. Also, under suitable conditions, $RG$ turns out to be code-checkable if and only if it is pseudo-morphic.

  9. Richard Schatzki: a familiar ring.

    Science.gov (United States)

    Patel, Birju; Han, Eugene; Swan, Kenneth

    2013-11-01

    The Schatzki ring was named for Richard Schatzki, a renowned radiologist who described the entity with his colleague, John E. Gary. The purpose of this article is to shed more light on a man who made such a significant contribution and to chronicle developments concerning this important radiologic finding. The Schatzki ring was described long ago, but its cause is poorly understood even today.

  10. Contraceptive vaginal rings: a review.

    Science.gov (United States)

    Brache, Vivian; Faundes, Anibal

    2010-11-01

    Development efforts on contraceptive vaginal rings were initiated over 40 years ago based on two principles: the capacity of the vaginal epithelium to absorb steroids and the capacity of elastomers to release these hormones at a nearly constant rate. Numerous models of contraceptive vaginal rings (CVRs) have been studied, but only two have reached the market: NuvaRing, a combined ring that releases etonogestrel (ENG) and ethinylestradiol (EE), and Progering, a progesterone-releasing ring for use in lactating women. The main advantages of CVRs are their effectiveness (similar to or slightly better than the pill), ease of use without the need of remembering a daily routine, user's ability to control initiation and discontinuation, nearly constant release rate allowing for lower doses, greater bioavailability and good cycle control with the combined ring. The main disadvantages are related to the mode of delivery; CVRs may cause vaginal discharge and complaints, ring expulsion is not uncommon, the ring may be felt during coitus and vaginal insertion may be unpleasant for some women. The studies reviewed in this article provide evidence that CVRs are safe, effective and highly acceptable to women. There is no doubt that CVRs offer a new, effective contraceptive option to women, expanding their available choices of hormonal contraception. Copyright © 2010 Elsevier Inc. All rights reserved.

  11. Biomechanics of Corneal Ring Implants

    Science.gov (United States)

    2015-01-01

    Purpose: To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus. Methods: The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant designs. The strengthening factor is a measure of the amount of strengthening of the cornea induced by the implant. Results: For ring segments and incomplete rings, sf = 1.0, which indicates that these implants are not able to strengthen the cornea. The intracorneal continuous complete ring (MyoRing) has a strengthening factor of up to sf = 3.2. The MyoRing is, therefore, able to strengthen the cornea significantly. Conclusions: The result of the presented biomechanical analysis of different ring-shaped corneal implant designs can explain the different postoperative clinical results of different implant types in myopia and keratoconus. PMID:26312619

  12. Biomechanics of Corneal Ring Implants.

    Science.gov (United States)

    Daxer, Albert

    2015-11-01

    To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus. The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant designs. The strengthening factor is a measure of the amount of strengthening of the cornea induced by the implant. For ring segments and incomplete rings, sf = 1.0, which indicates that these implants are not able to strengthen the cornea. The intracorneal continuous complete ring (MyoRing) has a strengthening factor of up to sf = 3.2. The MyoRing is, therefore, able to strengthen the cornea significantly. The result of the presented biomechanical analysis of different ring-shaped corneal implant designs can explain the different postoperative clinical results of different implant types in myopia and keratoconus.

  13. How Jupiter's Ring Was Discovered.

    Science.gov (United States)

    Elliot, James; Kerr, Richard

    1985-01-01

    "Rings" (by astronomer James Elliot and science writer Richard Kerr) is a nontechnical book about the discovery and exploration of ring systems from the time of Galileo to the era of the Voyager spacecraft. One of this book's chapters is presented. (JN)

  14. Constructions over localizations of rings

    Directory of Open Access Journals (Sweden)

    Alessandro Logar

    1987-11-01

    Full Text Available In this paper we construct a category of effective noetherian rings in which linear equations can be “solved”. This category is closed with respect to some important constructions like trascendental extensions, quotientations, finite products and localizations with respect to a large class of multiplicatively closed systems. Hence it gives a definition of “constructive” rings.

  15. DELPHI's Ring Imaging Cherenkov Chamber

    CERN Multimedia

    1989-01-01

    The hundreds of mirrors around this Ring Imaging Cherenkov Chamber reflect cones of light created by fast moving particles to a detector. The velocity of a particle can be measured by the size of the ring produced on the detector. DELPHI, which ran from 1989 to 2000 on the LEP accelerator, was primarily concerned with particle identification.

  16. The Search for Ringed Exoplanets

    Science.gov (United States)

    Kohler, Susanna

    2017-04-01

    Are planetary rings as common in our galaxy as they are in our solar system? A new study demonstrates how we might search for ringed exoplanets and then possibly finds one!Saturns Elsewhere?Artists illustration of the super ring system around exoplanet J1407b. This is the only exoplanet weve found with rings, but its not at all like Saturn. [Ron Miller]Our solar system is filled with moons and planetary rings, so it stands to reason that exoplanetary systems should exhibit the same features. But though weve been in the planet-hunting game for decades, weve only found one exoplanet thats surrounded by a ring system. Whats more, that system J1407b has enormous rings that are vastly different from the modest, Saturn-like rings that we might expect to be more commonplace.Have we not discovered ringed exoplanets just because theyre hard to identify? Or is it because theyre not out there? A team of scientists led by Masataka Aizawa (University of Tokyo) has set out to answer this question by conducting a systematic search for rings around long-period planet candidates.The transit light curve of KIC 10403228, shown with three models: the best-fitting planet-only model (blue) and the two best-fitting planet+ring models (green and red). [Aizawa et al. 2017]The Hunt BeginsWhy long-period planets? Rings are expected to be unstable as the planet gets closer to the central star. Whats more, the planet needs to be far enough away from the stars warmth for the icy rings to exist. The authors therefore select from the collection of candidate transiting planets 89 long-period candidates that might be able to host rings.Aizawa and collaborators then fit single-planet models (with no rings) to the light curves of these planets and search for anomalies curves that arent fit well by these standard models. Particularly suspicious characteristics include a long ingress/egress as the planet moves across the face of the star, and asymmetry of the transit shape.After applying a series of

  17. Ionization cooling ring for muons

    Directory of Open Access Journals (Sweden)

    R. Palmer

    2005-06-01

    Full Text Available Practical ionization cooling rings could lead to lower cost or improved performance in neutrino factory or muon collider designs. The ring modeled here uses realistic three-dimensional fields. The performance of the ring compares favorably with the linear cooling channel used in the second U.S. Neutrino Factory Study. The normalized 6D emittance of an ideal ring is decreased by a factor of approximately 240, compared with a factor of only 15 for the linear channel. We also examine such real-world effects as windows on the absorbers and rf cavities and leaving empty lattice cells for injection and extraction. For realistic conditions the ring decreases the normalized 6D emittance by a factor of 49.

  18. Minutes: ANSI Steering Committee on Solar Energy Standards Development

    Energy Technology Data Exchange (ETDEWEB)

    None

    1980-04-29

    Minutes of the April 29, 1980, meeting of the American National Standards Institute steering committee on solar energy standards development are given. Attachments include correspondence from individuals and organizations which primarily describe the Solar Public Interest Coordination Committee (SPICC) and its recent activities. Also a report on the meeting of the ANSI subcommittee on international activity is attached. (WHK)

  19. Naturalists in a Nutshell: 90 Minute Biographies of Eminent Scientists

    Indian Academy of Sciences (India)

    Home; Journals; Resonance – Journal of Science Education; Volume 3; Issue 11. Naturalists in a Nutshell: 90 Minute Biographies of Eminent Scientists ... Author Affiliations. S Mahadevan1. Department of Molecular Reproduction, Development, and Genetics, Indian Institute of Science, Bangaloft 560 012, India.

  20. 45 CFR 1802.7 - Transcripts, recordings, minutes of meetings.

    Science.gov (United States)

    2010-10-01

    ... identified in such minutes. (c) The Board shall maintain a complete verbatim copy of the transcript, a... transcription of such recording disclosing the identify of each speaker, shall be available at the actual cost of duplication or transcription. (3) The determination of the General Counsel to withhold information...

  1. 5 CFR 1632.10 - Transcripts, recordings, and minutes.

    Science.gov (United States)

    2010-01-01

    ... actual cost of duplication or transcription. (d) A complete verbatim copy of the transcript, a complete copy of the minutes, or a complete electronic recording or verbatim copy of a transcription thereof of... maintain a complete transcript or electronic recording or transcription thereof adequate to record fully...

  2. Relationship Between the 6-minute Walk Test and Correlates of ...

    African Journals Online (AJOL)

    The measurements included the 6-Minute Walk Distance (6MWD) for exercise capacity and the T2D correlates including age, body mass index, waist circumference and waist-hip ratio. The relationships between the parameters were determined using the Pearson's correlation coefficient at a significance level of 0.05.

  3. Alterations in the morphology of skeletal myofibres after 90 minutes ...

    African Journals Online (AJOL)

    1991-03-16

    Mar 16, 1991 ... Biopsies were taken before tourniquet application, at the end of the ischaemic period in 2 animals and after 3 hours of reperfusion in 3 animals. .... fibre type. This premise was supported by the morphometric data. After 90 minutes' ischaemia the coefficient of vanation of fibre diameter was similar to that of ...

  4. [Six-minute walk test in children with neuromuscular disease.

    Science.gov (United States)

    Cruz-Anleu, Israel Didier; Baños-Mejía, Benjamín Omar; Galicia-Amor, Susana

    2013-01-01

    Background: neuromuscular diseases affect the motor unit. When they evolve, respiratory complications are common; the six-minute walk test plays an important role in the assessment of functional capacity. Methods: prospective, transversal, descriptive and observational study. We studied seven children with a variety of neuromuscular diseases and spontaneous ambulation. We tested their lung function, and administered a six-minute walk test and a test of respiratory muscle strength to these children. Results: the age was 9.8 ± 2.4 years. All patients were males. Forced vital capacity decreased in three patients (42.8 %), forced expiratory volume during the first second (2.04 ± 1.4 L) and peak expiratory flow (4.33 ± 3.3 L/s) were normal. The maximum strength of respiratory muscles was less than 60 % of predicted values. The distance covered in the six-minute walk test was lower when compared with healthy controls (29.9 %). Conclusions: the six-minute walk test can be a useful tool in early stages of this disease, since it is easy to perform and well tolerated by the patients.

  5. Using Minute Papers to Determine Student Cognitive Development Levels

    Science.gov (United States)

    Vella, Lia

    2015-01-01

    Can anonymous written feedback collected during classroom assessment activities be used to assess students' cognitive development levels? After library instruction in a first-year engineering design class, students submitted minute papers that included answers to "what they are left wondering." Responses were coded into low, medium and…

  6. Is the bell ringing?

    CERN Multimedia

    Francesco Poppi

    2010-01-01

    During the Nobel prize-winning UA1 experiment, scientists in the control room used to ring a bell if a particularly interesting event had occurred. Today, the “CMS Exotica hotline” routine produces a daily report that lists the exotic events that were recorded the day before.   Display of an event selected by the Exotica routine. Take just a very small fraction of the available data (max. 5%); define the events that you want to keep and set the parameters accordingly; run the Exotica routine and only look at the very few images that the system has selected for you. This is the recipe that a small team of CMS researchers has developed to identify the signals coming from possible new physics processes. “This approach does not replace the accurate data analysis on the whole set of data. However, it is a very fast and effective way to focus on just a few events that are potentially very interesting”, explains Maurizio Pierini (CERN), who developed the...

  7. Hybrid silicon ring lasers

    Science.gov (United States)

    Liang, Di; Fiorentino, Marco; Bowers, John E.; Beausoleil, Raymond G.

    2011-01-01

    Hybrid silicon platform provides a solution to integrate active components (lasers, amplifiers, photodetectors, etc.) with passive ones on the same silicon substrate, which can be used for building an optical interconnect system. Owing to the advantages in footprint, power consumption, and high-speed modulation, hybrid silicon microring lasers have been demonstrated as a potential candidate for on-chip silicon light source. In this paper we review the progress to improve the performance of recently demonstrated compact microring lasers with ring diameter of 50 μm. A simple approach to enhance optical mode and electron-hole recombination, which results in threshold reduction and efficiency improvement is developed. This is done by appropriately undercutting the multiple quantum well (MQW) region to force carriers to flow towards the outer edge of the microring for better gain/optical mode overlap. We observe a reduction of the threshold of over 20% and up to 80% output power enhancement. The model and the experimental results highlight the benefits, as well as the negative effects from excessive undercutting, including lower MQW confinement, higher modal loss and higher thermal impedance. A design rule for MQW undercutting is therefore provided. Application as on-chip optical interconnects is discussed from a system perspective.

  8. Ion Rings for Magnetic Fusion

    Energy Technology Data Exchange (ETDEWEB)

    Greenly, John, B.

    2005-07-31

    This Final Technical Report presents the results of the program, Ion Rings for Magnetic Fusion, which was carried out under Department of Energy funding during the period August, 1993 to January, 2005. The central objective of the program was to study the properties of field-reversed configurations formed by ion rings. In order to reach this objective, our experimental program, called the Field-reversed Ion Ring Experiment, FIREX, undertook to develop an efficient, economical technology for the production of field-reversed ion rings. A field-reversed configuration (FRC) in which the azimuthal (field-reversing) current is carried by ions with gyro-radius comparable to the magnetic separatrix radius is called a field-reversed ion ring. A background plasma is required for charge neutralization of the ring, and this plasma will be confined within the ring's closed magnetic flux. Ion rings have long been of interest as the basis of compact magnetic fusion reactors, as the basis for a high-power accelerator for an inertial fusion driver, and for other applications of high power ion beams or plasmas of high energy density. Specifically, the FIREX program was intended to address the longstanding question of the contribution of large-orbit ions to the observed stability of experimental FRCs to the MHD tilt mode. Typical experimental FRCs with s {approx} 2-4, where s is the ratio of separatrix radius to ion gyro-radius, have been stable to tilting, but desired values for a fusion reactor, s > 20, should be unstable. The FIREX ring would consist of a plasma with large s for the background ions, but with s {approx} 1 for the ring ions. By varying the proportions of these two populations, the minimum proportion of large-orbit ions necessary for stability could be determined. The incorporation of large-orbit ions, perhaps by neutral-beam injection, into an FRC has been advanced for the purpose of stabilizing, heating, controlling angular momentum, and aiding the formation

  9. Supernumerary human hair cells-signs of regeneration or impaired development? A field emission scanning electron microscopy study.

    Science.gov (United States)

    Rask-Andersen, Helge; Li, Hao; Löwenheim, Hubert; Müller, Marcus; Pfaller, Kristian; Schrott-Fischer, Annelies; Glueckert, Rudolf

    2017-03-01

    Current attempts to regenerate cochlear sensorineural structures motivate further inspection of the human organ of hearing. Here, we analyzed the supernumerary inner hair cell (sIHC), a possible sign of regeneration and cell replacement. Human cochleae were studied using field emission scanning electron microscopy (FESEM; maximum resolution 2 nm) obtained from individuals aged 44, 48, and 58 years with normal sensorineural pure-tone average (PTA) thresholds (PTA <20 dB). The wasted tissue was harvested during trans-cochlear approaches and immediately fixed for ultrastructural analysis. All specimens exhibited sIHCs at all turns except at the extreme lower basal turn. In one specimen, it was possible to image and count the inner hair cells (IHCs) along the cochlea representing the 0.2 kHz-8 kHz region according to the Greenwood place/frequency scale. In a region with 2,321 IHCs, there were 120 scattered one-cell losses or 'gaps' (5%). Forty-two sIHCs were present facing the modiolus. Thirty-eight percent of the sIHCs were located near a 'gap' in the IHC row (±6 IHCs). The prevalence of ectopic inner hair cells was higher than expected. The morphology and placement could reflect a certain ongoing regeneration. Further molecular studies are needed to verify if the regenerative capacity of the human auditory periphery might have been underestimated.

  10. Gene expression modulation is associated with gene amplification, supernumerary chromosomes and chromosome loss in antimony-resistant Leishmania infantum

    Science.gov (United States)

    Leprohon, Philippe; Légaré, Danielle; Raymond, Frédéric; Madore, Éric; Hardiman, Gary; Corbeil, Jacques; Ouellette, Marc

    2009-01-01

    Antimonials remain the first line drug against the protozoan parasite Leishmania but their efficacy is threatened by resistance. We carried out a RNA expression profiling analysis comparing an antimony-sensitive and -resistant (Sb2000.1) strain of Leishmania infantum using whole-genome 70-mer oligonucleotide microarrays. Several genes were differentially expressed between the two strains, several of which were found to be physically linked in the genome. MRPA, an ATP-binding cassette (ABC) gene known to be involved in antimony resistance, was overexpressed in the antimony-resistant mutant along with three other tandemly linked genes on chromosome 23. This four gene locus was flanked by 1.4 kb repeated sequences from which an extrachromosomal circular amplicon was generated in the resistant cells. Interestingly, gene expression modulation of entire chromosomes occurred in the antimony-resistant mutant. Southern blots analyses and comparative genomic hybridizations revealed that this was either due to the presence of supernumerary chromosomes or to the loss of one chromosome. Leishmania parasites with haploid chromosomes were viable. Changes in copy number for some of these chromosomes were confirmed in another antimony-resistant strain. Selection of a partial revertant line correlated antimomy resistance levels and the copy number of aneuploid chromosomes, suggesting a putative link between aneuploidy and drug resistance in Leishmania. PMID:19129236

  11. Atypical supernumerary phantom limb and phantom limb pain in a patient with spinal cord injury: case report.

    Science.gov (United States)

    Choi, Ja Young; Kim, Hyo In; Lee, Kil Chan; Han, Zee-A

    2013-12-01

    Supernumerary phantom limb (SPL) resulting from spinal cord lesions are very rare, with only sporadic and brief descriptions in the literature. Furthermore, the reported cases of SPL typically occurred in neurologically incomplete spinal cord patients. Here, we report a rare case of SPL with phantom limb pain that occurred after traumatic spinal cord injury in a neurologically complete patient. After a traffic accident, a 43-year-old man suffered a complete spinal cord injury with a C6 neurologic level of injury. SPL and associated phantom limb pain occurred 6 days after trauma onset. The patient felt the presence of an additional pair of legs that originated at the hip joints and extended medially, at equal lengths to the paralyzed legs. The intensity of SPL and associated phantom limb pain subsequently decreased after visual-tactile stimulation treatment, in which the patient visually identified the paralyzed limbs and then gently tapped them with a wooden stick. This improvement continued over the 2 months of inpatient treatment at our hospital and the presence of the SPLs was reduced to 20% of the real paralyzed legs. This is the first comprehensive report on SPLs of the lower extremities after neurologically complete spinal cord injury.

  12. Supernumerary phantom limb in a patient with basal ganglia hemorrhage - a case report and review of the literature.

    Science.gov (United States)

    Kim, Hang-Rai; Han, Jee-Young; Park, Young Ho; Kim, Beom Joon; Yang, Wookjin; Kim, SangYun

    2017-09-08

    Supernumerary phantom limb (SPL) is a rare neurologic phenomenon, in which a patient misperceives an extra limb in addition to the original set of limbs. We report a case of SPL in a patient with a right basal ganglia hemorrhage and review the previous literature about this peculiar phenomenon. Two days after the event of a right basal ganglia hemorrhage, a 78-year-old male reported a phantom arm protruding from his left shoulder. He could not see or touch the phantom arm but he felt the presence of an addition arm lateral to his paretic arm. Pain or sensory discomfort were absent in either the paretic arm or the phantom arm. He stated that he could intentionally move the phantom arm independent of his paretic arm. The examination showed that the passive movement of his paretic arm did not elicit any movement of his phantom arm. We diagnosed the SPL as a complication of the hypertensive basal ganglia hemorrhage and treated him with anti-hypertensive medications. His phantom arm persisted for 3 weeks, and it gradually faded away. SPL had been reported as a rare complication of various types of cerebral lesions. Right hemispheric lesions were most frequently associated with the SPL. Considering the intentional movement of the phantom arm, we deduced that the SPL might result from the impairment of the sensory feedback system for both internal body image and motor movement.

  13. Atypical Supernumerary Phantom Limb and Phantom Limb Pain in a Patient With Spinal Cord Injury: Case Report

    Science.gov (United States)

    Choi, Ja Young; Kim, Hyo In; Lee, Kil Chan

    2013-01-01

    Supernumerary phantom limb (SPL) resulting from spinal cord lesions are very rare, with only sporadic and brief descriptions in the literature. Furthermore, the reported cases of SPL typically occurred in neurologically incomplete spinal cord patients. Here, we report a rare case of SPL with phantom limb pain that occurred after traumatic spinal cord injury in a neurologically complete patient. After a traffic accident, a 43-year-old man suffered a complete spinal cord injury with a C6 neurologic level of injury. SPL and associated phantom limb pain occurred 6 days after trauma onset. The patient felt the presence of an additional pair of legs that originated at the hip joints and extended medially, at equal lengths to the paralyzed legs. The intensity of SPL and associated phantom limb pain subsequently decreased after visual-tactile stimulation treatment, in which the patient visually identified the paralyzed limbs and then gently tapped them with a wooden stick. This improvement continued over the 2 months of inpatient treatment at our hospital and the presence of the SPLs was reduced to 20% of the real paralyzed legs. This is the first comprehensive report on SPLs of the lower extremities after neurologically complete spinal cord injury. PMID:24466528

  14. Chromosome 5 derived small supernumerary marker: towards a genotype/phenotype correlation of proximal chromosome 5 imbalances.

    Science.gov (United States)

    Melo, Joana Barbosa; Backx, Liesbeth; Vermeesch, Joris R; Santos, Heloisa G; Sousa, Ana C; Kosyakova, Nadezda; Weise, Anja; von Eggeling, Ferdinand; Liehr, Thomas; Carreira, Isabel Marques

    2011-05-01

    Small supernumerary marker chromosomes (sSMC) are a morphological heterogeneous group of additional abnormal chromosomes that cannot be characterized alone by conventional banding cytogenetics. Molecular cytogenetic techniques are valuable tools for the accurate identification of sSMC and a prerequisite for sound genetic counseling based on refined genotype/phenotype correlation. We describe a new case of a retarded patient with an sSMC derived from chromosome 5. The characterization of the sSMC was done by subcentromere-specific multicolor (subcenM) fluorescence in-situ hybridization (FISH) and by full tilling resolution array analysis, after microdissection and amplification of the marker DNA. Uniparental disomy for normal sister chromosomes of the sSMC(5) was excluded. The karyotype was mos47,XX,+r(5)(::p11.1 → q12.1::)[70%]/46,XX[30%], being the trisomic region between 46.15 ∼ 49.56 Mb and 61.25 ∼ 61.335 Mb, a region known to harbor ∼45 annotated genes. Together with a review of the previously described cases of sSMC(5) and duplications involving the 5q proximal region, we can conclude that trisomy of the 5q11 region is associated with learning difficulties and speech delay.

  15. High resolution SNP based microarray mapping of mosaic supernumerary marker chromosomes 13 and 17: delineating novel loci for apraxia.

    Science.gov (United States)

    Kogan, Jillene M; Miller, Erin; Ware, Stephanie M

    2009-05-01

    High resolution comparative genomic hybridization is emerging as a powerful tool for delineating chromosomal rearrangements such as duplications, deletions, and unbalanced translocations, but it has not yet been broadly applied for structural aberrations such as supernumerary marker chromosomes (SMCs). In this report, we present the clinical and molecular analysis of a patient with de novo mosaic SMC (17) and SMC (13). High resolution single nucleotide polymorphism (SNP) based microarray mapping successfully identified the parent of origin for the SMCs and allowed delineation of the breakpoints which include a 5.1 Mb duplication from 17p11.2 to 17q11.2 as well as duplication of chromosome 13 that includes 2.2 Mb from 13q11 to 13q12.11. Interestingly, the patient has markedly severe oral and verbal apraxia, a characteristic feature of patients with 17p11.2 duplication syndrome (Potocki-Lupski syndrome, PTLS). Fine mapping indicates that the patient's duplication overlaps with a subset of PTLS patients, but not with PTLS patients harboring the common microduplication. FISH analysis confirms that the patient lacks duplication of RAI1, a dosage sensitive gene within the common microduplication interval. Taken together, these results demonstrate the utility of SNP microarray based methodology for mapping disease-causing genes, including those within SMCs, and provide the opportunity to identify novel candidate genes for verbal apraxia.

  16. Complex rearranged small supernumerary marker chromosomes (sSMC, three new cases; evidence for an underestimated entity?

    Directory of Open Access Journals (Sweden)

    Mkrtchyan Hasmik

    2008-04-01

    Full Text Available Abstract Background Small supernumerary marker chromosomes (sSMC are present ~2.6 × 106 human worldwide. sSMC are a heterogeneous group of derivative chromosomes concerning their clinical consequences as well as their chromosomal origin and shape. Besides the sSMC present in Emanuel syndrome, i.e. der(22t(11;22(q23;q11, only few so-called complex sSMC are reported. Results Here we report three new cases of unique complex sSMC. One was a de novo case with a dic(13 or 21;22 and two were maternally derived: a der(18t(8;18 and a der(13 or 21t(13 or 21;18. Thus, in summary, now 22 cases of unique complex sSMC are available in the literature. However, this special kind of sSMC might be under-diagnosed among sSMC-carriers. Conclusion More comprehensive characterization of sSMC and approaches like reverse fluorescence in situ hybridization (FISH or array based comparative genomic hybridization (array-CGH might identify them to be more frequent than only ~0.9% among all sSMC.

  17. Interactions between BMP-7 and USAG-1 (uterine sensitization-associated gene-1 regulate supernumerary organ formations.

    Directory of Open Access Journals (Sweden)

    Honoka Kiso

    Full Text Available Bone morphogenetic proteins (BMPs are highly conserved signaling molecules that are part of the transforming growth factor (TGF-beta superfamily, and function in the patterning and morphogenesis of many organs including development of the dentition. The functions of the BMPs are controlled by certain classes of molecules that are recognized as BMP antagonists that inhibit BMP binding to their cognate receptors. In this study we tested the hypothesis that USAG-1 (uterine sensitization-associated gene-1 suppresses deciduous incisors by inhibition of BMP-7 function. We learned that USAG-1 and BMP-7 were expressed within odontogenic epithelium as well as mesenchyme during the late bud and early cap stages of tooth development. USAG-1 is a BMP antagonist, and also modulates Wnt signaling. USAG-1 abrogation rescued apoptotic elimination of odontogenic mesenchymal cells. BMP signaling in the rudimentary maxillary incisor, assessed by expressions of Msx1 and Dlx2 and the phosphorylation of Smad protein, was significantly enhanced. Using explant culture and subsequent subrenal capsule transplantation of E15 USAG-1 mutant maxillary incisor tooth primordia supplemented with BMP-7 demonstrated in USAG-1+/- as well as USAG-1-/- rescue and supernumerary tooth development. Based upon these results, we conclude that USAG-1 functions as an antagonist of BMP-7 in this model system. These results further suggest that the phenotypes of USAG-1 and BMP-7 mutant mice reported provide opportunities for regenerative medicine and dentistry.

  18. Ring-Ringlet Interactions in Saturn's C Ring

    Science.gov (United States)

    Rappaport, N. J.

    1997-01-01

    The overall obejective of this work is to derive a theoretical model for the formation of gaps harboring isolated ringlets in order to explain the presence of such features in Saturn's C ring and Cassini division.

  19. Origin and Evolution of Saturn's Ring System

    OpenAIRE

    Charnoz, Sebastien; Dones, Luke; Esposito, Larry W.; Estrada, Paul R.; Hedman, Matthew M.

    2009-01-01

    The origin and long-term evolution of Saturn's rings is still an unsolved problem in modern planetary science. In this chapter we review the current state of our knowledge on this long-standing question for the main rings (A, Cassini Division, B, C), the F Ring, and the diffuse rings (E and G). During the Voyager era, models of evolutionary processes affecting the rings on long time scales (erosion, viscous spreading, accretion, ballistic transport, etc.) had suggested that Saturn's rings are...

  20. Soft Congruence Relations over Rings

    Directory of Open Access Journals (Sweden)

    Xiaolong Xin

    2014-01-01

    Full Text Available Molodtsov introduced the concept of soft sets, which can be seen as a new mathematical tool for dealing with uncertainty. In this paper, we initiate the study of soft congruence relations by using the soft set theory. The notions of soft quotient rings, generalized soft ideals and generalized soft quotient rings, are introduced, and several related properties are investigated. Also, we obtain a one-to-one correspondence between soft congruence relations and idealistic soft rings and a one-to-one correspondence between soft congruence relations and soft ideals. In particular, the first, second, and third soft isomorphism theorems are established, respectively.

  1. Codes over infinite family of rings : Equivalence and invariant ring

    Science.gov (United States)

    Irwansyah, Muchtadi-Alamsyah, Intan; Muchlis, Ahmad; Barra, Aleams; Suprijanto, Djoko

    2016-02-01

    In this paper, we study codes over the ring Bk=𝔽pr[v1,…,vk]/(vi2=vi,∀i =1 ,…,k ) . For instance, we focus on two topics, i.e. characterization of the equivalent condition between two codes over Bk using a Gray map into codes over finite field 𝔽pr, and finding generators for invariant ring of Hamming weight enumerator for Euclidean self-dual codes over Bk.

  2. Control of a Supernumerary Robotic Hand by Foot: An Experimental Study in Virtual Reality.

    Science.gov (United States)

    Abdi, Elahe; Burdet, Etienne; Bouri, Mohamed; Bleuler, Hannes

    2015-01-01

    In the operational theater, the surgical team could highly benefit from a robotic supplementary hand under the surgeon's full control. The surgeon may so become more autonomous; this may reduce communication errors with the assistants and take over difficult tasks such as holding tools without tremor. In this paper, we therefore examine the possibility to control a third robotic hand with one foot's movements. Three experiments in virtual reality were designed to assess the feasibility of this control strategy, the learning curve of the subjects in different tasks and the coordination of foot movements with the two natural hands. Results show that the limbs are moved simultaneously, in parallel rather than serially. Participants' performance improved within a few minutes of practice without any specific difficulty to complete the tasks. Subjective assessment by the subjects indicated that controlling a third hand by foot has been easy and required only negligible physical and mental efforts. The sense of ownership was reported to improve through the experiments. The mental burden was not directly related to the level of motion required by a task, but depended on the type of activity and practice. The most difficult task was moving two hands and foot in opposite directions. These results suggest that a combination of practice and appropriate tasks can enhance the learning process for controlling a robotic hand by foot.

  3. Control of a Supernumerary Robotic Hand by Foot: An Experimental Study in Virtual Reality.

    Directory of Open Access Journals (Sweden)

    Elahe Abdi

    Full Text Available In the operational theater, the surgical team could highly benefit from a robotic supplementary hand under the surgeon's full control. The surgeon may so become more autonomous; this may reduce communication errors with the assistants and take over difficult tasks such as holding tools without tremor. In this paper, we therefore examine the possibility to control a third robotic hand with one foot's movements. Three experiments in virtual reality were designed to assess the feasibility of this control strategy, the learning curve of the subjects in different tasks and the coordination of foot movements with the two natural hands. Results show that the limbs are moved simultaneously, in parallel rather than serially. Participants' performance improved within a few minutes of practice without any specific difficulty to complete the tasks. Subjective assessment by the subjects indicated that controlling a third hand by foot has been easy and required only negligible physical and mental efforts. The sense of ownership was reported to improve through the experiments. The mental burden was not directly related to the level of motion required by a task, but depended on the type of activity and practice. The most difficult task was moving two hands and foot in opposite directions. These results suggest that a combination of practice and appropriate tasks can enhance the learning process for controlling a robotic hand by foot.

  4. [Draft minutes of IAPG Mechanical Working Group meeting

    Energy Technology Data Exchange (ETDEWEB)

    Skinner, D.M.

    1993-12-15

    This report provides the draft minutes of the Interagency Advanced Power Group meeting held November 3--4, 1993. Topics addressed are: Materials for thermal management; photovoltaic programs in the Airforce; ground based radar advanced power system development program; battery research; generator prognostics & diagnostics equipment; a thermal flight experiment test program; power systems assessment; Overview: Phillip`s space thermal technologies branch; and development of actuator thermal management.

  5. 265 Wait at Least 60 Minutes After Eating

    OpenAIRE

    Gandhi, Stella; Woodruff, Megan; Halley, Hillary; Patel, Samir; Shah, Summit

    2012-01-01

    Background We will describe 2 unique cases of Food Dependent Exercise Induced Anaphylaxis. Methods Patients underwent a complete history, physical exam, and skin prick testing by classical method. Results Case 1: A 23 year old Asian Male presented with anaphylaxis following cashew ingestion and post prandial exercise. This was the first episode of anaphylaxis despite previous exposure to cashews and exercise independently. Patient ingested cashews and went for a jog 30 minutes later. His symp...

  6. Can Academic Success Come from Five Minutes of Physical Activity?

    OpenAIRE

    Lynn M. Randall; Julienne K. Maeda

    2003-01-01

    Being physically active helps not only in the areas of health and fitness, but also in the area of academics, more specifically, mathematics. Brain-based teaching can play a large role in enhancing student learning through the use of movement, in particular, a short running activity on math fluency in addition problems. Could five minutes of a moderate to vigorous activity have any effect on students’ addition fluency? The purpose of this article is to share with readers the effects of ...

  7. Hyperventilation during routine electroencephalography: are three minutes really necessary?

    Science.gov (United States)

    Watemberg, Nathan; Farkash, Michael; Har-Gil, Miki; Sezer, Taner; Goldberg-Stern, Hadassah; Alehan, Füsun

    2015-04-01

    Hyperventilation induces absence seizures in children with absence epilepsy, and routine electroencephalography studies include three minutes of hyperventilation. We studied the duration of hyperventilation required to provoke a first absence seizure to determine whether three minutes of the procedure are indeed necessary. Electroencephalography records of children who experienced absence seizures during hyperventilation were reviewed. The time from hyperventilation onset to a first and further seizure(s) was measured, and the occurrence of absences during the posthyperventilation phase was also noted. Sixty-two studies were evaluated. Mean time from hyperventilation onset to a first absence was 52 seconds (median 32 seconds). The vast majority (85.5%) had an absence within 90 seconds. Most (68%) children sustained a single event. All eight children with posthyperventilation seizures had experienced at least one event during hyperventilation. Our findings suggest that current guidelines for routine pediatric electroencephalography recording requiring three minutes of hyperventilation may not be clinically necessary. We found that the vast majority of children referred for suspected absence seizures experience a seizure less than 90 seconds after hyperventilation onset, and even more so by 120 seconds. Hence, a larger prospective study is warranted to establish more accurate hyperventilation duration parameters. We also suggest that once an absence seizure has been recorded at any time during hyperventilation, this procedure could be stopped, thus reducing the amount of discomfort for the child. Copyright © 2015 Elsevier Inc. All rights reserved.

  8. Autumn study on storage rings

    CERN Multimedia

    1974-01-01

    The first two weeks of October have seen storage ring people from accelerator Laboratories throughout the world at CERN to study the fundamental problems of very high energy protonproton colliding beam machines.

  9. Burnside Rings of Fusion Systems

    DEFF Research Database (Denmark)

    Reeh, Sune Precht

    In this thesis we study the interactions between saturated fusion systems and group actions of the underlying p-groups. For a saturated fusion system F on a finite p-group S we construct the Burnside ring of F in terms of the finite S-sets whose actions respect the structure of the fusion system...... of the characteristic idempotent of F { the unique idempotent in the p-local double Burnside ring of S satisfying properties of Linckelmann and Webb. We describe this idempotent both in terms of fixed points and as a linear combination of transitive bisets. Additionally, using fixed points we determine the map...... of Burnside rings given by multiplication with the characteristic idempotent, and we show that this map is the transfer map previously constructed. Applying these results, we show that for every saturated fusion system the ring generated by all (non-idempotent) characteristic elements in the p-local double...

  10. $(n,m)$-SG rings

    OpenAIRE

    Bennis, Driss

    2009-01-01

    This paper is a continuation of the paper Int. Electron. J. Algebra 6 (2009), 219-227. Namely, we introduce and study a doubly filtered set of classes of rings of finite Gorenstein global dimension, which are called $(n,m)$-SG for integers $n\\geq 1$ and $m\\geq 0$. Examples of $(n,m)$-SG rings, for $n=1$ and 2 and every $m\\geq 0$, are given.

  11. Black Saturn with dipole ring

    OpenAIRE

    Yazadjiev, Stoytcho

    2007-01-01

    We present a new stationary, asymptotically flat solution of 5D Einstein-Maxwell gravity describing a Saturn-like black object: a rotating black hole surrounded by a rotating dipole black ring. The solution is generated by combining the vacuum black Saturn solution and the vacuum black ring solution with appropriately chosen parameters. Some basic properties of the solution are analyzed and the basic quantities are calculated.

  12. Commuting Π-regular rings

    Directory of Open Access Journals (Sweden)

    Shervin Sahebi

    2014-05-01

    Full Text Available ‎$R$ is called commuting regular ring (resp‎. ‎semigroupif‎ for each $x,y\\in R$ there exists $a\\in R$‎ such that$xy=yxayx$‎. ‎In this paper‎, ‎we introduce the concept of‎‎commuting $\\pi$-regular rings (resp‎. ‎semigroups and‎‎study various properties of them.

  13. Synlig læring

    DEFF Research Database (Denmark)

    Brandsen, Mads

    2017-01-01

    Introduktionen af John Hatties synlig læring i den danske skoleverden møder stadig meget kritik. Mange lærere og pædagoger oplever synlig læring som en tornado, der vil opsuge og ødelægge deres særlige danske udgave af den kontinentale dannelsestænkning, didaktik og pædagogik. Spørgsmålet er om...

  14. Black rings in six dimensions

    Energy Technology Data Exchange (ETDEWEB)

    Kleihaus, Burkhard, E-mail: b.kleihaus@uni-oldenburg.de [Institut fuer Physik, Universitaet Oldenburg, D-26111 Oldenburg (Germany); Kunz, Jutta; Radu, Eugen [Institut fuer Physik, Universitaet Oldenburg, D-26111 Oldenburg (Germany)

    2013-01-08

    We propose a general framework for the numerical study of balanced black rings for any spacetime dimensions d Greater-Than-Or-Slanted-Equal-To 5. Numerical solutions are constructed in a systematic way for d=6, by solving the Einstein field equations with suitable boundary conditions. These black rings have a regular event horizon with S{sup 1} Multiplication-Sign S{sup 3} topology, and they approach the Minkowski background asymptotically. We analyze their global and horizon properties.

  15. Optofluidic ring resonator dye lasers

    Science.gov (United States)

    Sun, Yuze; Suter, Jonathan D.; Fan, Xudong

    2010-02-01

    We overview the recent progress on optofluidic ring resonator (OFRR) dye lasers developed in our research group. The fluidics and laser cavity design can be divided into three categories: capillary optofluidic ring resonator (COFRR), integrated cylindrical optofluidic ring resonator (ICOFRR), and coupled optofluidic ring resonator (CpOFRR). The COFRR dye laser is based on a micro-sized glass capillary with a wall thickness of a few micrometers. The capillary circular cross-section forms the ring resonator and supports the whispering gallery modes (WGMs) that interact evanescently with the gain medium in the core. The laser cavity structure is versatile to adapt to the gain medium of any refractive index. Owing to the high Q-factor (>109), the lasing threshold of 25 nJ/mm2 is achieved. Besides directly pump the dye molecules, lasing through fluorescence resonance energy transfer (FRET) between the donor and acceptor dye molecules is also studied in COFRR laser. The energy transfer process can be further controlled by designed DNA scaffold labeled with donor/acceptor molecules. The ICOFRR dye laser is based on a cylindrical ring resonator fused onto the inner surface of a thick walled glass capillary. The structure has robust mechanical strength to sustain rapid gain medium circulation. The CpOFRR utilizes a cylindrical ring resonator fused on the inner surface of the COFRR capillary. Since the capillary wall is thin, the individual WGMs of the cylindrical ring resonator and the COFRR couples strongly and forms Vernier effect, which provides a way to generate a single mode dye laser.

  16. ring og forandring

    DEFF Research Database (Denmark)

    I de sidste ti år har læring været på dagsordenen som aldrig før. Inden for uddannelsesverdenen og den pædagogiske debat har man kunnet se et markant skift, hvor læringsbegrebet er blevet tematiseret langt stærkere på bekostning af undervisningsbegrebet. Samtidig er læring blevet sat på dagsordenen...

  17. Biomechanics of Corneal Ring Implants

    OpenAIRE

    Daxer, Albert

    2015-01-01

    Purpose: To evaluate the biomechanics of corneal ring implants by providing a related mathematical theory and biomechanical model for the treatment of myopia and keratoconus. Methods: The spherical dome model considers the inhomogeneity of the tunica of the eye, dimensions of the cornea, lamellar structure of the corneal stroma, and asphericity of the cornea. It is used in this study for calculating a strengthening factor sf for the characterization of different ring-shaped corneal implant de...

  18. Electrothermal Ring Burn - Case Report

    Directory of Open Access Journals (Sweden)

    Yakup Çil

    2012-09-01

    Full Text Available Low-voltage fountainheads such as car, tractor or motorcycle batteries are predisposed to produce large currents. Any metal object that comes into contact with these batteries may result in short-circuit. This may result in rapid and excessive heating of metal object and an electrothermal burn. Herein we presented a motorcycle driver who was 28-year-old man with electrothermal ring burn which was caused by metal chain that was used as a ring.

  19. IR spectra of Saturn's ring spokes and multiple shines in the Saturn-rings system

    Science.gov (United States)

    D'Aversa, Emiliano; Bellucci, Giancarlo; Filacchione, Gianrico; Cerroni, Priscilla; Nicholson, Phil D.; Carrozzo, Filippo G.; Altieri, Francesca; Oliva, Fabrizio; Geminale, Anna; Sindoni, Giuseppe; Hedman, Matthew M.

    2017-04-01

    During the last Saturn equinox, in 2009 August, spokes on the Saturn's B ring have been observed for the first time spectroscopically, at visible and infrared wavelengths. Measurements were obtained by Cassini-VIMS (Visual and Infrared Mapping Spectrometer) instrument in the 0.35-5.1 micron range. Spokes are either dark or bright features appearing on the B ring straddling the equinoxes, round to elongated in shape, lasting for minutes to hours, and moving partially pushed by Saturn's magnetic field. Previous spokes observations date back to the Voyager (1980 equinox,[1]), followed by a HST campaign (1995 equinox,[2]), and more recently Cassini-ISS images (2009 equinox,[3]). Theoretical models of spoke formation and evolution have been developed based on those observations, but there is not unanimous consensus on them. The most spread model considers the spoke as a cloud of very fine particles electrostatically levitating from the regolith of ring's boulders, and hovering on the ring plane while interacting with the ambient plasma until complete charge neutralization. The process triggering the grain charging is not yet clear (meteoroid bombardment, impacts of Saturn's lightnings electrons, etc.) but in any case a very small grain mass (high charge-to-mass ratio) is needed to allow electrostatic repulsion. From the observational point of view, small grain sizes (0.3-0.5 micron) have been retrieved by modeling the spoke reflectance in the visible spectral range (both Voyager, HST, and Cassini were equipped with multispectral imaging cameras). However, a first VIMS spoke observation ([4]) inferred a more spread size distribution (0.3 to 2.5 microns) to explain the high spoke contrast measured in the infrared. Here we will report about an analysis of two selected sets of spokes observed by VIMS. This selection aimed to include both high and low phase angle observations, and to take advantage from the highest spatial resolution data achieved in the infrared. We will

  20. Five-Minute Awake Snoring Test for Determining CPAP Pressures (Five-Minute CPAP Test: A Pilot Study

    Directory of Open Access Journals (Sweden)

    Macario Camacho

    2016-01-01

    Full Text Available Objective. To develop a quick, simple, bedside test for determining continuous positive airway pressures (CPAP for obstructive sleep apnea (OSA patients. Study Design. Prospective case series at a tertiary medical center. Methods. The Five-Minute Awake Snoring Test for Determining CPAP (Five-Minute CPAP Test was developed and tested. Patients wear a soft-gel nasal triangle mask while holding a tongue depressor with the wide section (1.75 cm between the teeth. Fixed pressure nasal CPAP is applied while the patient simulates snoring at 4 centimeters of water pressure. The pressure is incrementally titrated up and then down to determine the lowest pressure at which the patient cannot snore (Quiet Pressure. Results. Overall, thirty-eight patients participated. All could simulate snoring. Correlation coefficients were statistically significant between Quiet Pressures and body mass index (rs=0.60 [strong positive relationship], p=0.0088, apnea-hypopnea index (rs=0.49 [moderate positive relationship], p=0.039, lowest oxygen saturation (rs=-0.47 [moderate negative relationship], p=0.048, and oxygen desaturation index (rs=0.62 [strong positive relationship], p=0.0057. Conclusion. This pilot study introduces a new concept, which is the final product of over one year of exploration, development, and testing. Five-Minute CPAP Test is a quick, inexpensive, and safe bedside test based on supine awake simulated snoring with nasal CPAP.

  1. Reinforcement core facilitates O-ring installation

    Science.gov (United States)

    1965-01-01

    Reinforcement core holds O-ring in place within a structure while adjacent parts are being assembled. The core in the O-ring adds circumferential rigidity to the O-ring material. This inner core does not appreciably affect the sectional elasticity or gland-sealing characteristics of the O-ring.

  2. RESPONSE TO 6 MINUTE WALK TEST IN HEALTHY ADULTS

    Directory of Open Access Journals (Sweden)

    Vibhuti kiran shah

    2015-12-01

    Full Text Available Background: 6Minute walk test (MWT has been used as a performance based measure of functional exercise capacity in all populations including healthy adults. 6MWT is recommended out of other all timed walked tests due to its reproducibility and ease of administration compared to other longer or shorter time duration tests. It detects changes following interventions to improve exercise tolerance in healthy individuals, to assess the fitness level, used as intervention to improve walking endurance and as predictor of objectively measured aerobic fitness in healthy adults. It is essential to know a level of fitness healthy adults possess in our community, thus aim of this study was to evaluate response to 6MWT in young healthy adults. Method: 50 healthy individuals (25 males and 25 females of 18 - 30 years of age were recruited. The 6MWT was performed as per standard guidelines. All subjects were assessed for the outcome measures by principal investigator at baseline i.e. before and post- 6MWT for following parameters. BP, PR, RR, SPO2, RPE. Results: The mean 6 minute walked distance (6MWD was 635.6+59.07, for men it was 675.0+46.88 and for women it was 596.5+41.41. Out of study population 18% of people covered 70%-80%, 54% people covered 80%-90% and 28% people covered 90%-100% of their predicted distance. Oxygen saturation remained unaltered throughout the walk. Mean resting and walking spo2 values were 96.80+13.55% and 96.71+13.55% (p-value: 0.2288. Pulse rate (PR and respiratory rate (RR were affected by the walk. Mean resting and walking PR was 79.82+9.18 and 142.6+19.62 (p-value: 0.0001 and RR was 18.48+2.78 and 30.20+4.35 (p-value: 0.0001 respectively. Mean resting and walking systolic and diastolic blood pressure was significantly higher in males as compared to females. Conclusion: The 6 minute walk test is a useful measure of functional capacity in healthy adults. There was a difference between predicted distance covered and actual distance

  3. Six minute exposure of stars taken through airlock on Skylab

    Science.gov (United States)

    1973-01-01

    A six minute exposure of stars in the constellation Aquarius and others taken with a 35mm camera through the antisolar scientific airlock in the Orbital Workshop (OWS) of the Skylab space station in Earth orbit. Crewmen of the second manned Skylab mission took this picture as part of the Zodiacal Light/Gegenschein (S073) experiment. Most of the stars seen here belong to the constellation Aquarius and range in the stellar magnitude from +3, +6, +9. The dark patch on the right of the photograph is due to shielding of the sky by part of the experiment hardware.

  4. The effect of virtual visual feedback on supernumerary phantom limb pain in a patient with high cervical cord injury: a single-case design study.

    Science.gov (United States)

    Katayama, Osamu; Iki, Hidemasa; Sawa, Shunji; Osumi, Michihiro; Morioka, Shu

    2015-01-01

    We characterized the effect of virtual visual feedback (VVF) on supernumerary phantom limb pain (SPLP) in a patient with high cervical cord injury. The subject was a 22-year-old man diagnosed with complete spinal cord injury (level C2) approximately 5 years ago. We applied the ABA'B' single-case design and set phases B and B' as intervention phases for comparison. SPLP significantly improved in comparison of phase A with phase B and phase A with phase B'. We suggest that VVF reduces SPLP and the effect lasts after VVF.

  5. Supernumerary rainbows in the angular distribution of scattered projectiles for grazing collisions of fast atoms with a LiF(001) surface.

    Science.gov (United States)

    Schüller, A; Winter, H

    2008-03-07

    Fast atoms with keV energies are scattered under a grazing angle of incidence from a clean and flat LiF(001) surface. For scattering along low index azimuthal directions within the surface plane ("axial surface channeling") we observe pronounced peak structures in the angular distributions for scattered projectiles that are attributed to "supernumerary rainbows." This phenomenon can be understood in the framework of quantum scattering only and is observed here up to projectile energies of 20 keV. We demonstrate that the interaction potential and, in particular, its corrugation for fast atomic projectiles at surfaces can be derived with a high accuracy.

  6. Manipulation of vortex rings for flow control

    Energy Technology Data Exchange (ETDEWEB)

    Toyoda, Kuniaki; Hiramoto, Riho [Mechanical Systems Engineering, Hokkaido Institute of Technology, Maeda 7-15-4-1, Teine-ku, Sapporo 006-855 (Japan)], E-mail: toyodahm@poppy.ocn.ne.jp

    2009-10-15

    This paper reviews the dynamics of vortex rings and the control of flow by the manipulation of vortex rings. Vortex rings play key roles in many flows; hence, the understanding of the dynamics of vortex rings is crucial for scientists and engineers dealing with flow phenomena. We describe the structures and motions of vortex rings in circular and noncircular jets, which are typical examples of flows evolving into vortex rings. For circular jets the mechanism of evolving, merging and breakdown of vortex rings is described, and for noncircular jets the dynamics of three-dimensional deformation and interaction of noncircular vortex rings under the effect of self- and mutual induction is discussed. The application of vortex-ring manipulation to the control of various flows is reviewed with successful examples, based on the relationship between the vortex ring dynamics and the flow properties. (invited paper)

  7. Evaluation of samples comprising minute amounts of DNA.

    Science.gov (United States)

    Benschop, Corina C G; Haned, Hinda; Yoo, Seong Yeon; Sijen, Titia

    2015-09-01

    Minute amounts of DNA representing only few diploid cells, may be interrogated using enhanced DNA profiling, which will be accompanied by stochastic amplification effects. Notwithstanding, a weight of evidence statistic may be calculated using current interpretation software. In this study, we profiled single donor, two- and three-person samples having only 3 pg to 12 pg of DNA per contributor using both standard and enhanced capillary electrophoresis (CE) injection settings. Likelihood ratios (LRs) were computed using LRmix Studio, compared for both types of profiles and examined in relation to the amount of DNA, drop-out level, number of detected alleles, peak heights and reproducibility of alleles. Especially for DNA profiles that were generated using enhanced CE, the obtained LRs could indicate strong evidence in favour of the prosecution (log10(LR)>6), also when the amount of DNA represented about half of a diploid cell equivalent in the amplification. These results illustrate that an assessment of the criminalistic relevance of a sample carrying minute amounts of DNA is essential prior to applying enhanced interrogation techniques and/or calculating a weight of evidence statistic. Copyright © 2015 The Chartered Society of Forensic Sciences. Published by Elsevier Ireland Ltd. All rights reserved.

  8. Intrathecal baclofen toxicity and deep coma in minutes.

    Science.gov (United States)

    Tunali, Yusuf; Hanimoglu, Hakan; Tanriverdi, Taner; Hanci, Lale; Hanci, Murat

    2006-01-01

    In recent years, intrathecal baclofen (ITB) treatment in patients with refractory spasticity has been accepted as an effective therapy. However, this treatment modality may cause life-threatening complications. This report describes the clinical presentation, unfamiliar dilemmas, and treatment of a patient with ITB toxicity and raises awareness of problems that may arise. A 33-year-old man with refractory spasticity due to diffuse white matter injury was admitted for ITB treatment. The patient had respiratory difficulty followed by a generalized seizure and developed coma minutes after the drug administration. The patient was transferred into an intensive care unit immediately and managed accordingly. After proper management, the patient was followed and continued to receive ITB treatment. ITB therapy is a very effective method of rehabilitation and medication in patients with refractory spasticity, but physicians must be aware of the serious complications that may develop just minutes after the drug is administered. Although safe, baclofen pumps are nevertheless mechanical devices that may malfunction. Therefore, physicians should be mindful of the possibility of life-threatening complications that may develop and lead to a patient's death if proper treatment is not performed.

  9. Six-minute walk test in persons with transtibial amputation.

    Science.gov (United States)

    Lin, Suh-Jen; Bose, Nisha Hathi

    2008-12-01

    This study was to report the within-day test-retest reliability and the measurement properties of the six-minute walk test (6MWT) in persons with lower-limb (transtibial) amputation. Test-retest study design. University research laboratory. Subjects (N=13) with transtibial amputation (9 men and 4 women; mean age, 46 y). Three trials of the 6MWT were conducted within 1 day with 20 to 30 minutes of rest between consecutive trials. Timed Up & Go (TUG) test and timed one-leg balance tests were conducted on another day. (1) Distance, heart rate, symptoms and signs of exercise intolerance during the walk test, (2) times of the TUG test and the one-leg balance test. The intraclass correlation coefficient (ICC3,1) value was .94. Bland and Altman graphs showed no systemic variations between trials and a small learning effect. The peak heart rate approximated 72% to 78% of the age-predicted maximal heart rate. Moderate degrees of correlation were observed in: (1) the 6MWT versus the TUG test (r=-.76, Ptranstibial amputation.

  10. Concluding Remarks on the Planetary Rings Conference

    OpenAIRE

    Stone, E. C.

    1982-01-01

    In the past five years ring systems have been discovered around Uranus and Jupiter and a wealth of new data acquired about Saturn's rings. This vigorous observational program has been accompanied by renewed theoretical interest in ring systems. Although all of these topics have been addressed in papers at this first conference on planetary rings, these concluding remarks are focused on some of the key aspects of Saturn's rings about which more needs to be understood throu...

  11. Dream of Isochronous Ring Again

    CERN Document Server

    Hama, H

    2005-01-01

    More than 20 years ago, D.A.G. Deacon proposed an isochronous storage ring for FEL to avoid bunch heating and decreasing instantaneous gain [1]. Some of low momentum compaction (alpha) operations have been carried out, and recently coherent infrared radiation are observed on a 3rd generation light source. Because the 3rd generation rings are optimized to obtain very low emittance beam, the dispersion function in the arc sections are much reduced by introducing large bending radius, so that those are very big machines. Meanwhile N.A. Vinokurov et al. recently proposed a ring type SASE FEL based on a complete isochronous bending transport [2]. At least, experimental and theoretical study of the isochronous ring so far suggests nonlinear effects resulted from higher order dispersion and chromaticity declines the "complete" isochronous system. On the other hand, in a wavelength region of THz, tolerance of the path length along a turn of the ring seems to be within our reach. A concept to preserve of a form factor...

  12. Ring wormholes via duality rotations

    Directory of Open Access Journals (Sweden)

    Gary W. Gibbons

    2016-09-01

    Full Text Available We apply duality rotations and complex transformations to the Schwarzschild metric to obtain wormhole geometries with two asymptotically flat regions connected by a throat. In the simplest case these are the well-known wormholes supported by phantom scalar field. Further duality rotations remove the scalar field to yield less well known vacuum metrics of the oblate Zipoy–Voorhees–Weyl class, which describe ring wormholes. The ring encircles the wormhole throat and can have any radius, whereas its tension is always negative and should be less than −c4/4G. If the tension reaches the maximal value, the geometry becomes exactly flat, but the topology remains non-trivial and corresponds to two copies of Minkowski space glued together along the disk encircled by the ring. The geodesics are straight lines, and those which traverse the ring get to the other universe. The ring therefore literally produces a hole in space. Such wormholes could perhaps be created by negative energies concentrated in toroidal volumes, for example by vacuum fluctuations.

  13. Ring vaccination and smallpox control.

    Science.gov (United States)

    Kretzschmar, Mirjam; van den Hof, Susan; Wallinga, Jacco; van Wijngaarden, Jan

    2004-05-01

    We present a stochastic model for the spread of smallpox after a small number of index cases are introduced into a susceptible population. The model describes a branching process for the spread of the infection and the effects of intervention measures. We discuss scenarios in which ring vaccination of direct contacts of infected persons is sufficient to contain an epidemic. Ring vaccination can be successful if infectious cases are rapidly diagnosed. However, because of the inherent stochastic nature of epidemic outbreaks, both the size and duration of contained outbreaks are highly variable. Intervention requirements depend on the basic reproduction number (R0), for which different estimates exist. When faced with the decision of whether to rely on ring vaccination, the public health community should be aware that an epidemic might take time to subside even for an eventually successful intervention strategy.

  14. Tree rings and radiocarbon calibration

    Energy Technology Data Exchange (ETDEWEB)

    Barbetti, M. [University of Sydney, Sydney, NSW (Australia). NWG Macintosh Centre for Quaternary Dating

    1999-11-01

    Only a few kinds of trees in Australia and Southeast Asia are known to have growth rings that are both distinct and annual. Those that do are therefore extremely important to climatic and isotope studies. In western Tasmania, extensive work with Huon pine (Lagarostrobos franklinii) has shown that many living trees are more than 1,000 years old, and that their ring widths are sensitive to temperature, rainfall and cloud cover (Buckley et al. 1997). At the Stanley River there is a forest of living (and recently felled) trees which we have sampled and measured. There are also thousands of subfossil Huon pine logs, buried at depths less than 5 metres in an area of floodplain extending over a distance of more than a kilometre with a width of tens of metres. Some of these logs have been buried for 50,000 years or more, but most of them belong to the period between 15,000 years and the present. In previous expeditions in the 1980s and 1990s, we excavated and sampled about 350 logs (Barbetti et al. 1995; Nanson et al. 1995). By measuring the ring-width patterns, and matching them between logs and living trees, we have constructed a tree-ring dated chronology from 571 BC to AD 1992. We have also built a 4254-ring floating chronology (placed by radiocarbon at ca. 3580 to 7830 years ago), and an earlier 1268-ring chronology (ca. 7,580 to 8,850 years ago). There are many individuals, or pairs of logs which match and together span several centuries, at 9,000 years ago and beyond 15 refs., 1 tab., 1 fig.

  15. Maintenance of Minute Circulation Volume during Orthotopic Liver Transplantation

    Directory of Open Access Journals (Sweden)

    D. A. Levit

    2011-01-01

    Full Text Available Objective: to optimize procedures to maintain minute circulation volume at different stages of orthotopic liver transplantation. Subjects and methods. In the period 2005—2010, Sverdlovsk Regional Clinical Hospital One performed 32 orthotopic liver transplantations, including one retransplantation. The patients’ ASA class was (4—5. The operations were carried out under general anesthesia. The mean duration of surgery was 8.1 (range 5.8—10.5 hours. The investigators applied anesthesia based on iso-fluorane 0.6—0.9 MAC (by monitoring the anesthesia depth index with cerebral state index (CSI-40-60, as well as extended central hemodynamic monitoring (prepulmonary hemodilution. All the operations were made via portofemoroaxillary bypass, by using a centrifugal Biopump. Eight surgical stages were identified: 1 run-in (after tracheal intubation; 2 liver mobilization; 3 partial bypass; 4 complete bypass (hepatectomy, a liver-free period; 5 reperfusion; 6 a postreperfusion period (bypass end; 7 biliary repair; 8 the end of an operation. The concentrations of blood parameters, electrolytes, acid-base balance, and the levels of lactate and glucose were examined. The data were processed statistically. Central hemodynamics was monitored by prepulmonary thermodilution, by calculating cardiac index (CI, stroke index, and total peripheral vascular resistance index (TPVRI at the stages: liver mobilization, postreperfusion period (bypass end, and the end of surgery. Results. Even during partial bypass, there was a significant drop in mean blood pressure (MBP as compared to the baseline levels (p<0.05. Reperfusion was also accompanied by a significant decrease in MBP and an increase in heart rate. At the end of reperfusion and in the postreperfusion period, TPVRI was halved (689.2±68.0 as compared to the baseline levels. In the postreperfusion period, central venous and pulmonary artery pressures were significantly increased by 32 and 21%, respectively

  16. MeV proton flux predictions near Saturn's D ring.

    Science.gov (United States)

    Kollmann, P; Roussos, E; Kotova, A; Cooper, J F; Mitchell, D G; Krupp, N; Paranicas, C

    2015-10-01

    Radiation belts of MeV protons have been observed just outward of Saturn's main rings. During the final stages of the mission, the Cassini spacecraft will pass through the gap between the main rings and the planet. Based on how the known radiation belts of Saturn are formed, it is expected that MeV protons will be present in this gap and also bounce through the tenuous D ring right outside the gap. At least one model has suggested that the intensity of MeV protons near the planet could be much larger than in the known belts. We model this inner radiation belt using a technique developed earlier to understand Saturn's known radiation belts. We find that the inner belt is very different from the outer belts in the sense that its intensity is limited by the densities of the D ring and Saturn's upper atmosphere, not by radial diffusion and satellite absorption. The atmospheric density is relatively well constrained by EUV occultations. Based on that we predict an intensity in the gap region that is well below that of the known belts. It is more difficult to do the same for the region magnetically connected to the D ring since its density is poorly constrained. We find that the intensity in this region can be comparable to the known belts. Such intensities pose no hazard to the mission since Cassini would only experience these fluxes on timescales of minutes but might affect scientific measurements by decreasing the signal-to-contamination ratio of instruments.

  17. Nanoscale nonlinear PANDA ring resonator

    CERN Document Server

    Yupapin, Preecha

    2012-01-01

    Microring/nanoring resonator is an interesting device that has been widely studied and investigated by researchers from a variety of specializations. This book begins with the basic background of linear and nonlinear ring resonators. A novel design of nano device known as a PANDA ring resonator is proposed. The use of the device in the form of a PANDA in applications such as nanoelectronics, measurement, communication, sensors, optical and quantum computing, drug delivery, hybrid transistor and a new concept of electron-hole pair is discussed in detail.

  18. ring eller indlæring?

    DEFF Research Database (Denmark)

    Holsting, Vilhelm Stefan; Sjøstedt, Peter; Sørensen, Dorthe

    Dette working paper skal bidrage til den pædagogiske debat i forsvaret. Tekstens for mål er at støtte udviklingen af en voksenpædagogik i forsvaret, baseret på en konstruktivistisk opfattelse af læring, hvilket er i overensstemmelse med konklusionerne i rapporten fra Arbejdsgruppe vedrørende...

  19. Can Academic Success Come from Five Minutes of Physical Activity?

    Directory of Open Access Journals (Sweden)

    Lynn M. Randall

    2003-01-01

    Full Text Available Being physically active helps not only in the areas of health and fitness, but also in the area of academics, more specifically, mathematics. Brain-based teaching can play a large role in enhancing student learning through the use of movement, in particular, a short running activity on math fluency in addition problems. Could five minutes of a moderate to vigorous activity have any effect on students’ addition fluency? The purpose of this article is to share with readers the effects of infusing a short physical activity into an already busy day. Two primary findings were gleaned from this study. First, although there was a small positive effect on math fluency, there was no negative effect. Second, positive changes in students’ behavior were noted by the classroom teacher.

  20. Single Minute Exchange of Die. A Case Study Implementation

    Directory of Open Access Journals (Sweden)

    António Carrizo Moreira

    2011-03-01

    Full Text Available The Single Minute Exchange of Die (SMED, a process-based innovation originally published in the mid 1980s, involves the separation and conversion of internal setup operations into external ones. Although very important in increasing productivity SMED experiences are not very widespread in Ibero-America. Accordingly, this article has as its main objective to contribute to the literature addressing this less studied topic: SMED. A case study was put forward emphasizing a process-based view. The main finding is that by implementing SMED techniques the firm managed to eliminate wastefulness and non-added value activities worth around 360 000€, which is about 2% of the firm’s sales volume.