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third molar tooth

 

Definition: eighth permanent tooth in the maxilla and mandible on each side, making it the most posterior tooth in human dentition; usually erupts between the 17th and 23rd years; the roots are often fused, the separation being marked only by grooves; because it tends to erupt in an anterosuperior direction, the lower third molar often becomes impacted against the lower second molar; it is common for one third molar (or more) to fail to develop.

Synonym(s): dens molaris tertiusTA, dens serotinus, dens sapientiae, third molar, wisdom tooth

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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