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definitions
incisor (n.)
1.a tooth situated at the front of the mouth"his malocclusion was caused by malposed anteriors"
2.a tooth for cutting or gnawing; located in the front of the mouth in both jaws
Incisor (n.)
1.(MeSH)Any of the eight frontal teeth (four maxillary and four mandibular) having a sharp incisal edge for cutting food and a single root, which occurs in man both as a deciduous and a permanent tooth. (Jablonski, Dictionary of Dentistry, 1992, p820)
Merriam Webster
IncisorIn*ci"sor (?; 277), n. [NL.] (Anat.) One of the teeth in front of the canines in either jaw; an incisive tooth. See Tooth.
IncisorIn*ci"sor, a. Adapted for cutting; of or pertaining to the incisors; incisive; as, the incisor nerve; an incisor foramen; an incisor tooth.
synonyms
incisor (n.)
phrases
Incisor Ridge • Mandibular central incisor • Mandibular lateral incisor • Maxillary central incisor • Maxillary lateral incisor
analogical dictionary
tooth[Classe]
élément du squelette humain (fr)[Classe]
situé, placé (fr)[Classe...]
(anatomy; general anatomy)[termes liés]
(facade; front; façade; heads)[termes liés]
bone, os[Hyper.]
dentition, denture, set of teeth, teeth[membre]
toothy - anteriority - anterior, eyetooth, front tooth, incisor - anteriorly - position, spatial relation[Dérivé]
posterior[Ant.]
cog, tooth[Hyper.]
anterior, front[Dérivé]
incisor (n.)
cog, tooth[Hyper.]
incisor (n.)
Wikipedia
Incisor
 |
This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2009) |
| Incisor | |
|---|---|
 |
|
| Permanent teeth of right half of lower dental arch, seen from above. | |
 |
|
| The permanent teeth, viewed from the right. | |
| Latin | dentes incisivi |
| Gray's | subject #242 1115 |
| MeSH | Incisor |
Incisors (from Latin incidere, "to cut") are the first four front teeth present in heterodont mammals. They are located in the premaxilla above and on the mandible below.
Contents |
Function
In many omnivorous mammals, such as the human, they are adapted for shearing sharply. In cats, the incisors are small; biting off meat is done with the canines and the carnassials. In elephants, the upper incisors are modified into curved tusks, just as is the case with Narwhals, where normally one of them develops into a straight and twisted tusk. The incisors of rodents grow throughout life and are worn by gnawing.
Number and types of incisors
In humans
Adult humans normally have eight incisors, two of each type. The types of incisor are:
- maxillary central incisor (upper jaw, closest to the center of the lips)
- maxillary lateral incisor (upper jaw, beside the maxillary central incisor)
- mandibular central incisor (lower jaw, closest to the center of the lips)
- mandibular lateral incisor (lower jaw, beside the mandibular central incisor)
Children with a full set of deciduous teeth (primary teeth) also have eight incisors, named the same way as in permanent teeth. Young children may have from zero to eight incisors depending on the stage of their tooth eruption and tooth development.
In non-human animals
Among other animals, some other primates, cats and horses have twelve. Rodents have four, while Foxes have nine. Rabbits and hares (lagomorphs) were once considered rodents, but are distinguished by having eight—one small pair, called "peg teeth", is located directly behind the most anterior pair. Incisors are used to bite off tough foods, such as red meat.
Additional images
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Mouth (oral cavity)
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Left maxilla. Outer surface.
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Base of skull. Inferior surface.
See also
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