dentition

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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.

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.

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
References in periodicals archive ?
The total number of autistic children with primary dentitions were 51, in the mixed dentition 216, and in the permanent dentition 216.
Are the age of the athlete and the possibility of providing space for erupting teeth in the mixed dentition (age 6-12) going to affect the mouth guard?
He showed that arch length typically decreases with time from the mixed dentition through the transitional dentition and into early adulthood.
If the answer is no, the alternative late treatment, commonly begun at the end of the mixed dentition stage and featuring E-space conservation and some sort of maxillary distalization, would seem to be in order.
This study used a three-dimensional maxillary photoelastic model in the mixed dentition.
A considerable number of the children in the study group were over 9 years old and already were in the late mixed dentition stage.
Intra-oral examination: There was a mixed dentition with evidence of previous caries and untreated lesions present.
Clinical examination revealed a normal mixed dentition in all quadrants with the exception of the mandibular right side where the first permanent molar was severely submerged, its occlusal surface being at the gingival level.
Long term implications of treatment decisions made in the mixed dentition will be emphasised.