Consideration of many congenitally missing teeth including first molars

Abstract

Many statistical investigations confirm the low incidence of congenital missing of incisors and first molars. We encountered in familial congenital missing of many teeth including first molars in four cases (father, son, and two daughters) accompanied without congenital ectodermal dysplasia. All cases were examined by X-ray cephalometric analysis and cast model analysis. The findings were as follows : 1) [table] 2) In these cases, there were no characteristic features regarding the shapes of the erupted teeth and mesiodistal diameters of the crown, and dental arch forms. 3) In maxillofacial morphology, it was suggested that the congenital missing of molars was related with antero-posterior underdevelopmennt of an upper jaw, the small posterior facial height and an wide gonial angle, though these cases were exhibited blood relation.