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Authors had observed the average numbers of the fille teeth per mouth, and the occurrence rates of the secondary caries around the various forms of the filling bodies in 2,093 dental out-patients in the Infirmary, College of Dentistry, Seoul National University in 1970, in order to make a basic data considered in the establishment of the policy for the dental health in Korea. The obtained results were as follows: 1. In Korea, the average number of the filled teeth per mouth in the dental out patients had been increased gradually. 2. In the dental out-patients in 1970, the relative rate of amalgam filling bodies had been decreased, but the relative rate of gold inlays increased compared with the dental out-patients in 1963 and 1964. 3. The secondary caries around the various forms of the filling bodies was 6.38 percent of total caries cavities. 4. 17.14 percent of total filling bodies was accompanied with the secondary caries. 5. The secondary caries had been occurred from the margin in 22.52 percent of amalgam filling bodies, in 8.84 percent of gold inlays, in 18.84 percent of silicate filling bodies, and in 22010 percent of temporary filling bodies.
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