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dentes molares
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A lower wisdom tooth after extraction
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Permanent teeth of right half of lower dental arch, seen from above
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Posterior Superior Alveolar Artery
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are the rearmost and most complicated kind of
Tooth in most
Mammal s. In many mammals they grind food; hence the Latin name ''mola'', "
Millstone ".
Adult humans have twelve molars, in four groups of three at the back of the mouth. The third (rearmost) molar in each group is called a
Wisdom Tooth . It is the last tooth to appear, breaking through the surface of the gum at about the age of twenty, although this varies by ethnicity.
The types of molars in the human mouth are:
Molars differ considerably from one species to another, so there are many terms describing them:
- : This kind is found in Insectivore s and young Platypus es (adults have no teeth). Upper molars look like three-pointed mountain ranges; lowers look like two peaks and a third off to the side.
- : This kind is found in Human s and various other species. Four cusps are arranged in a rectangle; there may be a fifth.
- : The cusps, instead of being sharp peaks, are rounded hills. The entire tooth is covered in Enamel , and is most common among omnivores such as the Pig , the Bear and Humans .
- : There is a lot of enamel and dentine above the gumline and the top of the pulp. This kind of molar is found in mammals that wear their teeth a lot, such as the Horse .
- : The tooth has two ridges that meet at an angle, forming the letter lambda.
- : Like zalambdodont, but there are two lambdas on one tooth.
- : The tooth has a few ridges perpendicular to the jaw.
- : The tooth has a crescent-shaped ridge or ridges.
- : The tooth has several parallel oblique ridges on its surface. The Elephant ''Loxodonta'' is named for this feature.
The '', or shearing end, and the ''
Talinoid '', or crushing heel. With the exception of Jurassic mammal ''
Shuotherium '', the talinoid is posterior the triginoid.
The tribosphenic design appears in all species of
Mammal s. In
Monotreme s, it seems to have developed independently, rather than from common ancestry with
Marsupial s and
Placental s.
