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.

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 ?
Scenario #2: Long-term care resident, well-educated female in her 70s, evidence of cognitive decline, full dentition, poor oral hygiene, high caries risk, root caries eventually amputating most teeth despite efforts to restore.
What would our orthodontic colleagues think of the recommendation of the wholesale removal of the leeway space that nature has provided for the permanent dentition by allowing subsequent mesial drift?
The webinar features a 19-year-old female patient who has healthy dentition and gingiva, but is not satisfied with her smile.
The functional adaptation of the dentition of this species (cutting/chopping) is indicative of predation on small invertebrates.
Additionally, her lower dentition was so abnormal that she needed a canine tooth to be removed so she could properly close her mouth.
There is only one correct assemblage of the anterior X-ray film holder, and this assemblage enables imaging of both the maxillary and mandibular anterior dentition.
Complete dentition consisted of the right upper incisor 2 and canine, left upper premolar 4 (Fig.
Intraoral examination revealed yellowish to blue-gray appearance of the anterior dentition and extensive dental caries associated with most maxillary and mandibular posterior teeth.
Also the petrified bony bits and pieces of dentition of ruminants (Rhinoceros, Giraffids, Suids and Bovids) were discovered from Dhok Bun Ameer Khatoon, Chakwal.
Like us, the baby, or deciduous teeth are gradually replaced by the adult or permanent dentition.
The importance of complete dentition for a healthy and balanced life is well-proven clinically.