In dentistry,<unk> , also called<unk>  vera, is a rare genetic disorder characterized by the congenital absence of all primary or permanent teeth.  It is associated with the group of skin and nerve syndromes called the ectodermal dysplasias.<unk>  is usually part of a syndrome and seldom occurs as an isolated entity.
Partial<unk> , known as hypodontia or oligodontia, is the congenital absence of one or more teeth.  Congenital absence of all wisdom teeth, or third molars, is relatively common.
Anodontia
Hypodontia
Hemifacial microsomia
Micrognathism
Iniencephaly
Elfin facies
Low-set ears
Acrania