tooth

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tooth:

see 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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Tooth

One of the structures found in the mouth of most vertebrates which, in their most primitive form, were conical and were usually used for seizing, cutting up, or chewing food, or for all three of these purposes. The basic tissues that make up the vertebrate tooth are enamel, dentin, cementum, and pulp (see illustration).

Structure of a toothenlarge picture
Structure of a tooth

Enamel is the hardest tissue in the body because of the very high concentration, about 96%, of mineral salts. The remaining 4% is water and organic matter. The enamel has no nerve supply, although it is nourished to a very slight degree from the dentin it surrounds. The fine, microscopic hexagonal rods (prisms) of apatite which make up the enamel are held together by a cementing substance.

Dentin, a very bonelike tissue, makes up the bulk of a tooth, consisting of 70% of such inorganic material as calcium and phosphorus, and 30% of water and organic matter, principally collagen. The rich nerve supply makes dentin a highly sensitive tissue; this sensitivity serves no obvious physiological function.

Cement is a calcified tissue, a type of modified bone less hard than dentin, which fastens the roots of teeth to the alveolus, the bony socket into which the tooth is implanted. A miscellaneous tissue, consisting of nerves, fibrous tissue, lymph, and blood vessels, known as the pulp, occupies the cavity of the tooth surrounded by dentin.

The dentition of therian mammals, at least primitively, consists of four different kinds of teeth. The incisors (I) are usually used for nipping and grasping; the canines (C) serve for stabbing or piercing; the premolars (Pm) grasp, slice, or function as additional molars; and the molars (M) do the chewing, cutting, and grinding of the food. Primitively the placentals have 40 teeth and the marsupials 50.

In therian mammals, probably because of the intricacies and vital importance of tooth occlusion, only part of the first (or “milk”) dentition is replaced. This second, or permanent, dentition is made up of incisors, canines, and premolars; as a rule only one premolar is replaced in marsupials. Although the molars erupt late in development and are permanent, that is, not replaced, they are part of the first, or deciduous, dentition.

tooth

One of a series of carved ornaments, typically a pyramidal shape or a four-petal flower, usually set in a concave molding band; used in the Romanesque and Gothic Revival styles. See also: Ornament

tooth

[′tüth]
(anatomy)
One of the hard bony structures supported by the jaws in mammals and by other bones of the mouth and pharynx in lower vertebrates serving principally for prehension and mastication.
(design engineering)
One of the regular projections on the edge or face of a gear wheel.
An angular projection on a tool or other implement, such as a rake, saw, or comb.
(graphic arts)
The coarse or abrasive quality of a paper or a painting ground that assists in the application of charcoal, pastels, or paint.
A paper texture that holds ink more readily.
(invertebrate zoology)
Any of various sharp, horny, chitinous, or calcareous processes on or about any part of an invertebrate that functions like or resembles vertebrate jaws.

tooth

1. In a paint film, a fine texture imparted either by pigments or by the abrasives used in sanding; this texture provides a good base for the adhesion of a subsequent coat of paint.
2. A dogtooth, 2.

tooth

1. any of various bonelike structures set in the jaws of most vertebrates and modified, according to the species, for biting, tearing, or chewing
2. any of various similar structures in invertebrates, occurring in the mouth or alimentary canal
3. any of the various small indentations occurring on the margin of a leaf, petal, etc.
4. any one of a number of uniform projections on a gear, sprocket, rack, etc., by which drive is transmitted
References in periodicals archive ?
In the present study, when direct pulp capping with MTA was performed in permanent teeth, there was a clear preference for MTA to be used less often in anterior teeth.
Therefore, the aims of this observational study were; to investigate the etiologic factors, effects of age and gender on DT and to examine the clinical behavior of direct composite resin performed with a submicron hybrid composite in vital and non-vital traumatized anterior teeth.
The maxillary anterior teeth were prepared for ceramic veneer thickness starting with the labial surface using depth cutting burs from mesioproximal line angle to distoproximal line angle.
Patients who were under the usage of drugs known to increase risk of gingival enlargement such as calcium-channel blockers, cyclosporine A or phenytoin, patients with severe anterior teeth crowding, patients having artificial crown restorations of the anteriors and patients showing any history of oral surgery in anterior teeth were excluded from the study.
Based on tooth location, most teeth extracted due to trauma were anterior teeth in patients who did not qualify for the HCR program.
It was found in the present study that the position and type of the tooth are as factors influencing the prevalence of pain experience by the patients so that in both jaws, the prevalence of pain in posterior teeth was higher than in anterior teeth.
5 mm (group 1) had experienced trauma to permanent anterior teeth, 54(35.
The effect of post, core, crown type, and ferrule presence on the biomechanical behavior of endodontically treated bovine anterior teeth.
The production of dental nanocomposite to be used in recovery dentistry and filling of anterior teeth was among the objectives we followed in this research.
For anterior teeth, this idea was introduced 25 years ago [Fleming et al.
1979) and it is more frequently found in maxilla than in mandible (PORTELA; GONCALVES, 1988), and on the anterior teeth (PANDIS et al.
The inflammatory nature of periapical cyst and its involvement of non vital teeth facts can somewhat explain the association with maxillary anterior teeth which are more prone to caries and trauma.

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