Shimada, Toshiro with Takahiro Kojima, Koichiro Okumura, Kinya Machida, Akira Uchino, "Number of Surviving Teeth for Japanese Age Groups", 1994
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We have done research fore these 20 years on the model for dental diseases in Japan. We started from 2 sector of demography and dental caries, then added pyorrhea, baby teeth and technology sectors.