A. TOTAL ANODONTIA

True anodontia (or total anodontia) is the total congenital absence of the entire primary or secondary dentitions and is extremely rare. It is most often associated with a generalized congenital deformation (a sex-linked genetic trait) involving the abnormal development of the ectoderm or outer embryonic cell layer. Faulty ectodermal development further affects such structures as hair, nails, sebaceous and sweat glands, and salivary glands.

B. PARTIAL ANODONTIA

Partial anodontia, also referred to as hypodontia, involves one or more congenitally missing teeth from a dentition. Now thought to be a hereditary trait, the tendency for missing the same teeth does run in families. Radiographs are required to assure that missing teeth are, in fact, missing and not just unerupted.

1. Most Commonly Missing Permanent Teeth

The most commonly missing permanent teeth are third molars, with the maxillary third molars absent from the dentition more often than the mandibular thirds.

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