부산대학교 도서관

Periapical inflammation of deciduous teeth is one factor that influences the succeeding permanent tooth germ. The course of eruption of the succeeding permanent tooth and its hypoplastic status were observed. Eighteen deciduous molars from 11 children, whose permanent tooth germs seemed to be infected because periapical inflammation of deciduous teeth, were examined in this study. From the formative stage of the permanent tooth germ during infection, the clinical course was continuously observed with special attention to the degree of permanent tooth hypoplasia immediately after eruption and the tooth's growth status during the 3 years after eruption. The results were as follows : 1) Hypoplastic molar teeth were more frequently observed in 1st premolars than in 2nd premolars and in the maxilla more frequently than in the mandible. 2) Infection occurred in most cases when enamel calcification was insufficient. 3) A possible relationship was found between the degree of permanent tooth hypoplasia and the tooth's formative stage when the permanent tooth germ seemed to have become. 4) In many cases permanent teeth, erupted earlier on the infected side than on the noninfected side.