同一個体における乳歯と永久歯の齲蝕罹患性の関連について

概要

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This study was made on the comparison between the deciduous dental caries at five years old and the dental caries of permanent dentition at eighteen years old by the follow-up examination in the same persons, who were residented in Suginami-ku, Tokyo. The subjects of this study were born in 1943, 1947 and 1948, and those numbers were 46, 66 and 41 respectively.<BR>Conclusion were as follow: -<BR>1. It appeared that the significant correlation was existed between the number of def teeth at the age of five and the number of DMF teeth at the age of eighteen in subjects born in 1947 and 1948. (r=0.55 in 1947 case and r=0.44 in 1948 case.) But there was no significant relationship in 1943 case, (r=0.23) probably because of the changes of food conditions during the Second World War.<BR>2. According to the extention pattern of deciduous dental caries, subjects were divided into four groups, and the relationship in each group was studied. There was found the tendency that the group with the more extensive conditions in deciduous caries had the more DMF teeth in their permanent dentition.<BR>3. With regard to the intensity and extension on the caries conditions of deciduous molars, they were divided into four groups. There were also the tendency that the severer group in deciduous molars had the more DMF teeth in their permanent dentition.