(Lat.nazvanie - adentia prima partialis) The disease, which is characterized by the absence of teeth due to congenital lack of permanent tooth bud or his death. Causes of the disease - a violation of the embryonic development of tooth tissue, periodontitis, which was formed in the root of a baby tooth. Diagnosed on the radiograph. Sometimes the tooth does not erupt, but seen in the thickness of the jaw. This retention.