抄録
A 14-month-old half-blood boy, whose father is an American, is presented. The erupted deciduous teeth, permanent tooth-germ and alveolar bone were studied both histologically and physico-chemically. Marked incisal attrition was observed in the deciduous incisors. A decrease in microhardness of the enamel and dentin was observed. Although a decrease in amount of inorganic materials were found, the chemical composition of the dentin was similar to that of normal dentin. The pulp chamber did not decrease in its size. The tooth germ of permanent incisor showed hypoplasia and hypocalcification of the dentin. The pulp chamber was wide. The remodeling process of the alveolar bone seemed to be disturbed.
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