Dentary Tooth Shape in Sphenodon and Its Fossil Relatives (Diapsida: Lepidosauria: Rhynchocephalia)

2009 ◽  
pp. 9-15 ◽  
Author(s):  
M.E.H. Jones
Keyword(s):  
Tooth Shape ◽  
Dentary Tooth

scholarly journals Influence of Various Tooth Shape Topology for Single-Phase Permanent Magnet Flux Switching Machine

2021 ◽  
Vol 1127 (1) ◽  
pp. 012027
Author(s):  
Laili Iwani Jusoh ◽  
Erwan Sulaiman ◽  
Md Zarafi Ahmad ◽  
Irfan Ali Soomro ◽  
Hassan Ali Soomro
Keyword(s):  
Permanent Magnet ◽  
Single Phase ◽  
Tooth Shape

Planar Procrustes analysis of tooth shape

2001 ◽  
Vol 46 (3) ◽  
pp. 191-199 ◽  
Author(s):  
D.L Robinson ◽  
P.G Blackwell ◽  
E.C Stillman ◽  
A.H Brook
Keyword(s):  
Procrustes Analysis ◽  
Tooth Shape

Influence of phylogeny on the estimation of diet from dental morphology in the Carnivora

Paleobiology ◽  
2021 ◽  
pp. 1-16
Author(s):  
Samantha S. B. Hopkins ◽  
Samantha A. Price ◽  
Alec J. Chiono
Keyword(s):  
Evolutionary History ◽  
Morphological Data ◽  
Evolutionary Constraints ◽  
Dental Morphology ◽  
Tooth Shape ◽  
Fossil Mammals ◽  
Phylogenetic Constraints ◽  
Substantial Error ◽  
Evolutionary Tempo And Mode ◽  
Vertebrate Skeleton

Abstract Because teeth are the most easily preserved part of the vertebrate skeleton and are particularly morphologically variable in mammals, studies of fossil mammals rely heavily on dental morphology. Dental morphology is used both for systematics and phylogeny as well as for inferences about paleoecology, diet in particular. We analyze the influence of evolutionary history on our ability to reconstruct diet from dental morphology in the mammalian order Carnivora, and we find that much of our understanding of diet in carnivorans is dependent on the phylogenetic constraints on diet in this clade. Substantial error in estimating diet from dental morphology is present regardless of the morphological data used to make the inference, although more extensive morphological datasets are more accurate in predicting diet than more limited character sets. Unfortunately, including phylogeny in making dietary inferences actually decreases the accuracy of these predictions, showing that dietary predictions from morphology are substantially dependent on the evolutionary constraints on carnivore diet and tooth shape. The “evolutionary ratchet” that drives lineages of carnivorans to evolve greater degrees of hypercarnivory through time actually plays a role in allowing dietary inference from tooth shape, but consequently requires caution in interpreting dietary inference from the teeth fossil carnivores. These difficulties are another reminder of the differences in evolutionary tempo and mode between morphology and ecology.

An Improved Fuse Escapement for the Mark 18 and Other U. S. Navy Mechanical Time Fuses

1946 ◽  
Vol 13 (4) ◽  
pp. A285-A290
Author(s):  
F. G. Kelly ◽  
J. L. Zar
Keyword(s):  
Test Performance ◽  
Neutral Position ◽  
Matching Function ◽  
Tooth Shape ◽  
Firing Test ◽  
Driving Torque

Abstract Theoretical shortcomings of previous Army and Navy fuse escapements are pointed out. The development of a new escape wheel and lever is described, in which spurious torques due to the fall of escape-wheel teeth against the pallets are eliminated; and a tooth shape is derived which delivers accelerating impulses symmetrically about the neutral position of the lever. Fuses with the new escapement have a timing rate which is independent of driving torque over the range of torques encountered; they can be assembled with one size of wheel and lever and with no hand-matching, function at low driving torques, and have given improved firing-test performance.

scholarly journals The tooth, the whole tooth and nothing but the tooth: tooth shape and ontogenetic shift dynamics in the white sharkCarcharodon carcharias

2017 ◽  
Vol 91 (4) ◽  
pp. 1032-1047 ◽  
Author(s):  
G. C. A. French ◽  
M. Stürup ◽  
S. Rizzuto ◽  
J. H. van Wyk ◽  
D. Edwards ◽  
...  
Keyword(s):  
Ontogenetic Shift ◽  
Tooth Shape ◽  
Shift Dynamics

scholarly journals Patients’ general satisfaction with the appearance of anterior maxillary teeth

2017 ◽  
Vol 74 (6) ◽  
pp. 520-525 ◽  
Author(s):  
Vlatka Lajnert ◽  
Daniela Kovacevic-Pavicic ◽  
Hrvoje Pezo ◽  
Aleksandra Stevanovic ◽  
Tatjana Jovic ◽  
...  
Keyword(s):  
Dental Plaque ◽  
Negative Influence ◽  
Cross Sectional ◽  
Age And Gender ◽  
Tooth Shape ◽  
General Satisfaction ◽  
Anterior Teeth ◽  
Dental Appearance ◽  
And Gender ◽  
The Impact

Background/Aim. Dental appearance plays an important role in practically all personal social interactions. The main factors that define the dental appearance are tooth colour, shape and position, quality of restoration, and the general position of the teeth in arch, especially in the anterior region. The aim of this study was to evaluate the impact of dental status (tooth shape, fracture, dental and prosthetic restorations and presence of plaque) on patient''s satisfaction with the dental appearance, controlling for the age and gender. Methods. A total of 700 Caucasian subjects (439 women) aged 18?86 (median 45 years) participated in the cross-sectional study. Study included clinical examination and self-administrated questionnaire based on selfperceived aesthetics and satisfaction with the appearance of their maxillary anterior teeth. Results. A regression analysis demonstrated that presence of dental plaque, tooth fracture, composite fillings and crowns had significant independent contribution and were negative predictors of satisfaction with teeth appearance. Participants with presence of plaque on upper teeth (p < 0.001), fractures (p = 0.005), composite fillings (p < 0.001) and crowns (p = 0.032) were less satisfied than those without it. Model explains 12% or variance of general satisfaction with the appearance of maxillary frontal teeth (p < 0.001) and the major contributors are composite fillings (5.3%) and plaque (3.2%). Tooth shape, age and gender were not significant predictors of satisfaction. Conclusion. Satisfaction with the teeth appearance is under the influence of many factors with significant negative influence of presence of dental plaque, fractures, composite restorations, and crowns.

scholarly journals Bilateral mandibular premolars with tooth shape deviation: a rare dental anomaly

2014 ◽  
Vol 31 (01) ◽  
pp. 070-073
Author(s):  
G. Costa ◽  
F. Ramos-Perez ◽  
J. Castro ◽  
D. Perez
Keyword(s):  
Rare Case ◽  
Dental Arch ◽  
Shape Deviation ◽  
Tooth Shape ◽  
Dental Anomaly ◽  
Shape Deviations ◽  
Clinical Consequences

AbstractThe tooth shape deviations are rare dental anomaly described in premolars, characterized by to show simultaneously an increased mesio-distal dimension and decreased bucco-lingual dimension when compared with other normal teeth. The presence of such teeth with variation in size may be related to malocclusions, since there is a reduction in circumference of the dental arch. This report describes a rare case of bilateral tooth shape deviations in the two mandibular first premolars and discusses the prevalence of this condition and the eventual clinical consequences associated with this dental anomaly.

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