Mandibular dental anomalies of Northwest Atlantic harp seals, Phoca groenlandica

1987 ◽  
Vol 65 (3) ◽  
pp. 769-771 ◽  
Author(s):  
R. E. A. Stewart ◽  
B. E. Stewart
Keyword(s):  
Genetic Variation ◽  
Harp Seal ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Northwest Atlantic ◽  
Frequency Distributions ◽  
Phoca Groenlandica

We examined 2267 harp seal mandibles to determine the frequency of extra, missing, and malformed teeth; to examine the effect of these anomalies on longevity; and to assess the usefulness of anomalies in identifying stocks of seals. Supernumerary teeth occurred in 1.7% of the seals, 0.5% of the seals were missing teeth (none because of trauma), and 0.6% had morphologically deviant teeth. Only 0.2% of the seals had more than one type of anomaly and none had all three. Average age and age–frequency distributions for anomalous and normal seals were not different. Anomalies were probably too rare and combined too much genetic variation to be useful in stock delineation.

Incidence of various dental anomalies in population of Taxilla, Pakistan

2021 ◽  
Vol 15 (10) ◽  
pp. 2710-2711
Author(s):  
Saman Malik ◽  
Faiqa Hassan ◽  
Muhammad Farooq ◽  
Usman ul Haq ◽  
Amna Faisal ◽  
...  
Keyword(s):  
Gender Discrimination ◽  
Radiology Department ◽  
Dental Radiology ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Impacted Teeth ◽  
The People ◽  
Dental Procedures ◽  
Different Types

Background: There are different types of teeth anomalies that effects the people of different regional populations. Aim: To determine the occurrence of dental anomalies in patients of Taxila that visit our college for routine dental procedures. Methods: The study was retrospective and was conducted on periapical intraoral radiographs of patients between the ages of 15 to 35 years, with no gender discrimination at Dental College HITEC-IMS. Results: We collected data from 450 periapical intraoral radiographs that were taken in last six months (i.e. 15th January 2021 till 15th July 2021) in dental radiology department. Conclusion: The dental anomalies that were found in the population of taxila were impacted teeth, missing teeth, rotated tooth, supernumerary teeth (mesiodens), root dilacerations, peg lateral, taurodontism and hypercementosis. Keywords: Root anomalies, dental anomalies, periapical radiograph

Pup Production of Harp Seals, Phoca groenlandica, in the Northwest Atlantic

1993 ◽  
Vol 50 (11) ◽  
pp. 2429-2439 ◽  
Author(s):  
G. B. Stenson ◽  
R. A. Myers ◽  
M. O. Hammill ◽  
I- H. Ni ◽  
W. G. Warren ◽  
...  
Keyword(s):  
Developmental Stages ◽  
Harp Seal ◽  
Northwest Atlantic ◽  
Black And White ◽  
Aerial Surveys ◽  
Phoca Groenlandica ◽  
Best Estimate ◽  
Age Related

Northwest Atlantic harp seal, Phoca groenlandica, pup production was estimated from aerial surveys flown off eastern Newfoundland ("Front") and in the Gulf of St. Lawrence ("Gulf") during March 1990. One visual and two independent photographic estimates were obtained at the Front; a single photographic estimate was obtained in the Gulf. Photographic estimates were corrected for misidentified pups by comparing black-and-white photographs with ultraviolet imagery. Estimates were also corrected for pups absent from the ice at the time of the survey using distinct age-related developmental stages. Stage durations in the Gulf appeared consistent with previous studies but were increased by 30% to improve the fit to staging data collected at the Front. The best estimate of pup production at the Front was obtained from the visual surveys. A total of 467 000 (SE = 31 000) pups were born in three whelping concentrations. The photographic estimates were comparable. Pup production estimates for the southern (Magdalen Island) and northern (Mecatina) Gulf whelping patches were 106 000 (SE = 23 000) and 4 400 (SE = 1300), respectively. Thus, total pup production was estimated to be 578 000 (SE = 39 000).

scholarly journals The Prevalence of Dental Anomalies in the Western Region of Saudi Arabia

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Ahmed R. Afify ◽  
Khalid H. Zawawi
Keyword(s):  
Saudi Arabia ◽  
Western Region ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Cross Sectional ◽  
Impacted Teeth ◽  
Congenitally Missing Teeth ◽  
The Western Region ◽  
Congenitally Missing

Objective. The aim of this cross-sectional study was to investigate the prevalence of dental anomalies that could be a cause of malocclusion in the western region of Saudi Arabia. Materials and Methods. A retrospective study of 878 digital orthopantomograms (OPGs) taken of patients, age ranging between 12 and 30 years, who presented to treatment at the Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia between 2002 and 2011. The OPGs and dental records were reviewed for congenitally missing teeth, supernumerary teeth, impactions, ectopic eruption, transposition, germination, fusion, dilacerations, taurodontism, dens in dent, and any other unusual conditions that can be assessed with OPG. Results. The prevalence of patient that exhibited at least one dental anomaly was 396 (45.1%) patients. The prevalence of congenitally missing teeth was 226 (25.7%), impacted teeth 186 (21.1%), dilacerated teeth 10 (1.1%), supernumerary teeth 3 (0.3%), odontoma 1 (0.1%), and taurodontism was also 1 case (0.1%) of the total radiographs reviewed. Conclusions. Congenitally missing teeth were found to be the most prevalent anomaly (25.7%), and the second frequent anomaly was impacted teeth (21.1%), whereas root dilacerations, supernumerary teeth, and taurodontism were the least frequent anomalies (1.1%, 0.3% and 0.1%, resp.).

scholarly journals Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

2016 ◽  
Vol 106 (0) ◽  
Author(s):  
M. Amelia Chemisquy ◽  
Gabriel M. Martin
Keyword(s):  
Gene Flow ◽  
Fluctuating Asymmetry ◽  
Similar Proportion ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Functional Value ◽  
Crown Shape ◽  
Limited Gene Flow ◽  
Didelphis Albiventris

ABSTRACT Dental anomalies have been investigated and reported for most orders of mammals, including marsupials. Previous works in Didelphis albiventris Lund, 1840 only described one kind of malformation or just a few observations from some collections, thus the type and presence of anomalies for this species was underestimated. The aim of this contribution is to describe and analyze several dental anomalies found in specimens of Didelphis albiventris from Argentina, Uruguay and Brazil. Dental anomalies were classified in three categories: supernumerary or missing teeth, morphological anomalies in size and shape, and teeth in unusual positions. We found 32 individuals of D. albiventris with anomalies out of 393 analyzed specimens (8.14%), some specimens with more than one anomaly. A similar proportion of specimens from Argentina and Uruguay presented anomalies, while in specimens from Brazil anomalies were less common. Anomalies were more commonly found in the upper toothrow and in molars, being supernumerary teeth and molars with unusual crown-shape the most common ones. The percentage of specimens with anomalies found for D. albiventris is higher than previously reported for the species, and other Didelphimorphia. Inbreeding and limited gene flow do not appear as possible explanations for the elevated percentage of anomalies, especially due to the ecological characteristics of Didelphis albiventris. Developmental instability and fluctuating asymmetry could be some of the causes for the anomalies found in this species, mostly since the habitat used by D. albiventris tends to be unstable and disturbed. Dental anomalies were mostly found in areas of the toothrow where occlusion is relaxed or does not prevent teeth from interlocking during mastication, and consequently have no functional value.

Mark–Recapture Estimates of Harp Seal Pup (Phoca groenlandica) Production in the Northwest Atlantic

1983 ◽  
Vol 40 (6) ◽  
pp. 728-742 ◽  
Author(s):  
W. D. Bowen ◽  
D. E. Sergeant
Keyword(s):  
Reporting Rate ◽  
Harp Seal ◽  
Short Term ◽  
Northwest Atlantic ◽  
Tag Loss ◽  
Phoca Groenlandica ◽  
Seal Population ◽  
Sources Of Variation ◽  
Variance Estimates

Pup production of the northwest Atlantic harp seal population (Phoca groenlandica) was estimated using a modified Petersen model corrected for tag loss and nonreporting of recovered tags. Variance estimates were corrected for the additional sources of variation due to tag loss, reporting rate, and the estimation of the number of seals examined for tags. Experiments were conducted in March of 1978, 1979, and 1980 with 9154, 4939, and 6246 pups being tagged in each year, respectively. Estimates from short-term recoveries (within the same year) were unreliable because of failure to satisfy the assumption of uniform mixing of marked and unmarked seals. Pooled estimates from long-term recoveries (1–3 yr) were considered more reliable, with the 1978 estimate of 506 000 ± 77 000 (1 SE) and the 1979 estimate of 489 000 ± 71 000 being most reliable. Based on the results of this study and on the trend in catches of pups and immatures in West Greenland, we conclude that harp seal pup production and hence population size has probably increased since the imposition of catch quotas in 1971.

scholarly journals Dental Anomalies’ Characteristics

Diagnostics ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1161
Author(s):  
Tatiana Sella Tunis ◽  
Ofer Sarne ◽  
Israel Hershkovitz ◽  
Tamar Finkelstein ◽  
Aikaterini Maria Pavlidi ◽  
...  
Keyword(s):  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Chi Square ◽  
Posterior Teeth ◽  
Development Patterns ◽  
Anterior Teeth ◽  
Chi Square Test ◽  
History Of ◽  
Maxillary Lateral Incisor

The aim of this study was to characterize dental anomalies. The pretreatment records (photographs and radiographs) of 2897 patients (41.4% males and 58.6% females) were utilized to detect dental anomalies. The dental anomalies studied were related to number, size and shape, position, and eruption. A Chi-square test was carried out to detect associations between dental anomalies, jaw, and sex. A total of 1041 (36%) of the subjects manifested at least one dental anomaly. The prevalence of all dental anomalies was jaw-dependent and greater in the maxilla, except for submerged and transmigrated teeth. The most frequently missing teeth were the maxillary lateral incisor (62.3%) and the mandibular second premolars (60.6%). The most frequent supernumerary teeth were the incisors in the maxilla (97%) and the first premolars in the mandible (43%). Dental anomalies are more frequent in the maxilla and mainly involve the anterior teeth; in the mandible, however, it is the posterior teeth. These differences can be attributed to the evolutionary history of the jaws and their diverse development patterns.

Dental anomalies in Caluromys (Marsupialia, Didelphimorphia, Didelphidae, Caluromyinae) and a reassessment of malformations in New World marsupials (Didelphimorphia, Microbiotheria and Paucituberculata)

Mammalia ◽  
2018 ◽  
Vol 82 (5) ◽  
pp. 500-508
Author(s):  
Gabriel M. Martin ◽  
María Amelia Chemisquy
Keyword(s):  
Root Morphology ◽  
New World ◽  
The Other ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Occlusal Surfaces ◽  
Almost All

Abstract Dental anomalies have been documented in almost all mammalian orders, and include supernumerary or missing teeth, teeth with aberrant occlusal surfaces and/or roots and teeth in unusual positions. Our objectives were the description and categorization of dental anomalies in all species of the genus Caluromys. We studied 462 crania, recorded and classified dental anomalies in four categories: variations in occlusal/root morphology; teeth in unusual positions; supernumerary/missing teeth; presence of unshed deciduous premolars. We found anomalies in all species, with a percentage ranging from 11% to 6.3%. Caluromys derbianus produced anomalous M4/m4 and flipped crowns, the other two species produced higher numbers of missing teeth. We infer that flipped crowns might have consequences in mastication, while other anomalies seem to be less functionally important, especially those at the end of the toothrow. Comparisons with other New World marsupials show caluromyines have more anomalies in M4/m4 shape (similar to microbiotherids) and flipped crowns, while didelphids have more supernumerary teeth, and caenolestids have more missing teeth.

Congenitally Missing Permanent Mandibular Central Incisors and Maxillary Second Molars in Conjunction with a Supernumerary Mandibular Central Incisor

2017 ◽  
Vol 11 (2) ◽  
pp. 44-47
Author(s):  
Vandana Dahiya ◽  
Neetu Gupta ◽  
Abhijeet Kadu ◽  
Sukhvinder Oberoi ◽  
Charu Mohan Marya
Keyword(s):  
Multidisciplinary Approach ◽  
Case Reports ◽  
Rare Condition ◽  
Central Incisor ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Supernumerary Tooth ◽  
Missing Teeth ◽  
Congenitally Missing Teeth ◽  
Congenitally Missing

ABSTRACT Congenitally missing teeth are one of the most common dental anomalies which may be termed as dental agenesis. Polygenesis, the formation of one or more supernumerary teeth, occurs much less frequently than agenesis. Hypodontia and hyperdontia are regarded as the opposite dental developmental anomalies. However, their simultaneous presence in the same individual is a rare condition. A case of concomitant hypo-hyperdontia (CHH) is presented here, wherein a 20-year-old female has missing mandibular central incisors, maxillary second molars, and all the third molars. In addition, she has a malformed supernumerary tooth in the mandibular left anterior region. Documentation of such rare case reports is necessary as it helps in minimizing the clinicians' challenge in diagnosing such cases and thus helpful in providing a multidisciplinary approach in treating such patients. How to cite this article Gupta N, Kadu A, Marya CM, Nagpal R, Oberoi S, Dahiya V. Congenitally Missing Permanent Mandibular Central Incisors and Maxillary Second Molars in Conjunction with a Supernumerary Mandibular Central Incisor. J Oral Health Comm Dent 2017;11(2):44-47.

A Retrospective Study of Association between Peg-shaped Maxillary Lateral Incisors and Dental Anomalies

2017 ◽  
Vol 41 (2) ◽  
pp. 150-153 ◽  
Author(s):  
Jae-Hwan Kim ◽  
Nam-Ki Choi ◽  
Seon-mi Kim
Keyword(s):  
Retrospective Study ◽  
Pediatric Dentistry ◽  
Careful Consideration ◽  
Dental Anomalies ◽  
Supernumerary Teeth ◽  
Missing Teeth ◽  
Panoramic Radiographs ◽  
Congenitally Missing Teeth ◽  
Congenitally Missing ◽  
Dens Invaginatus

Objective: The purpose of this study was to investigate the prevalence of peg-shaped maxillary lateral incisors and the incidence of associated dental anomalies in children. Study design: We investigated the prevalence of peg-laterals and incidence of associated dental anomalies in 3,834 children aged 7–15 who visited the Department of Pediatric Dentistry from January 2010 to December 2015 and underwent panoramic radiographs. Results: The prevalence of peg-laterals was 1.69% in boys, 1.75% in girls, and 1.72% overall. Among children with peg-laterals, the frequencies of associated dental anomalies were as follows: congenitally missing teeth, 31.8%; dens invaginatus, 19.7%; palatally displaced canines, 12.1%; supernumerary teeth, 7.6%; and transposition, 7.6%. Conclusion: As children with peg-laterals have a higher incidence of other dental anomalies, careful consideration is needed when planning diagnosis and treatment.

Sign in / Sign up

Export Citation Format

Share Document