Aplasia

Aplasia means the underdevelopment of an organ.
 * Example of aplasia: failure to establish a regular tooth.

In orthopedics, it means congenital failure to form some part of the skeleton. Compare: dysplasia

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Other anomalies of the number of teeth:
 * Hyperodontia
 * Hypodontia
 * Oligodontia
 * Total anodontia