dentition


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Related to dentition: primary dentition

dentition,

kind, number, and arrangement of the teethteeth,
hard, calcified structures embedded in the bone of the jaws of vertebrates that perform the primary function of mastication. Humans and most other mammals have a temporary set of teeth, the deciduous, or milk, teeth; in humans, they usually erupt between the 6th and 24th
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 of humans and other animals. During the course of evolution, teeth were derived from bony body scales similar to the placoid scales on the skin of modern sharks. Tooth structures such as those found in humans are restricted to certain vertebrates, i.e., most fish, mammals, and reptiles, and some amphibians. The teeth of sharks, which are primitive vertebrates, consist of simple conelike structures, sometimes with serrated edges and sometimes flattened for crushing shelled prey. In many lower vertebrates the individual teeth are replaced throughout the animal's life; old tooth loss and new tooth growth follow wavelike patterns down the length of jaw and affect alternate teeth at any one time, so that half the teeth in a region are always functional. Fish and reptiles that have teeth have homodont dentition; that is, all teeth are identical. The mammals have heterodont dentition, or teeth of different basic types, including incisors for nipping or cutting, canines for piercing, and premolars and molars for shearing and grinding. Carnivorous animals have relatively small incisors, used for grasping rather than for cutting; long and strong canines; and relatively thin, sharp premolars and molars, used for severing muscle and other tissues. Herbivorous animals have well-developed incisors, used to cut grass and other vegetation; canines that are either smaller than those of carnivores or absent altogether; and broad, flat premolars and molars for grinding food. In some herbivores, the upper canines are absent, so they cut vegetation by the combined action of the tongue and lower incisors. Omnivorous animals such as man have less specialized dentition. Only part of the dentition of mammals is usually replaced; however, the incisors of rodents grow out at the base as fast as they wear down at the tip. Teeth, the hardest structures in the body, have been well preserved as fossils and have played an important role for paleontologists and physical anthropologists in the study of human evolution.
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dentition

[den′tish·ən]
(vertebrate zoology)
The arrangement, type, and number of teeth which are variously located in the oral or in the pharyngeal cavities, or in both, in vertebrates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

dentition

1. the arrangement, type, and number of the teeth in a particular species. Man has a primary dentition of deciduous teeth and a secondary dentition of permanent teeth
2. teething or the time or process of teething
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Morphological and numerical characteristics of the Southern Chinese dentitions. Part II: Traits in the permanent dentition.
Some authors placed mini-plates or mini-screws into the anterior border of mandibular ramus and performed either en-masse distalization of mandibular dentition or tooth distalization (3-6).
Keywords: Dental arch, Inter-canine width, Mixed dentition, Orthodontic intervention.
The prevalence for microdontia in the primary dentition ranges from 0.1% to 0.9% with no specific gender predilection, in permanent dentition the prevalence is from 3.5% to 6.5% with more predisposition in the females of about 3:2.
Displacement of anterior dentition. In accordance with 3D finite element analysis models and three groups of loading conditions, initial displacement of anterior dentition was calculated and results were displayed in Figure 5.
Evaluation of two siblings with Papillon-Lefevre syndrome 5 years after treatment of periodontitis in primary and mixed dentition. J Periodontol.
Overall prevalence of dental caries according to CAST for the primary and permanent dentition was 75.44% and 16.53%, respectively.
The effect of orthodontic tilting movements on the periodontal tissues of infected and non-infected dentitions in dogs.
The cheek tissues in the present case were affected bilaterally due to its tight adherence to dentition. The literature evidently addressed alteration of facial musculature in patients with SIS.7 Electromyographic analysis of facial muscles of two siblings showed an overall increased muscular activity of the temporal, orbicularis oris, orbicularis oculi, and masseter muscles.8 Thus, teeth crowding in the present case could be referred partly to the strong perioral musculature contraction.
Studies have shown the possibility of having microdontia teeth in the permanent dentition following chemotherapy below the age of 3.5 years old [21].
The current literature is unclear regarding not only how changes in having a functional dentition are associated with periodontal variables in less-developed countries but also the prevalence of such changes, which lacks are part of what inspired the study described herein.