Abstract
Of 211 rural of randum sampling cases, 99 men and 112 women aged above 15, from 100 families of two communities in Ibaragi Prefecture, the relations in quality and quantity of dental caries with sex, age, teeth and jaws, was statistically studied out, but as there is no difference of significance between those communities, they are regarded as one enlarged community we could obtain the following results:I. The relations in quality of each dental caries, in surface, deep seated and root stump caries, all caries with those and women sampled, anterior and posterior teeth, upper and lower jaws, no difference of significance were perceived, but in the cases of missing teeth and prosthetic teeth, we could perceive the difference of significance, in women's lower jaws posterior teeth; -that is, P=0.001.II. On the relations quantity of each dental caries, the number of surface caries in anterior teeth 25, and in posterior ones, 96, the total being 121, while deep seated caries in anterior teeth were 61 in number, in posterior 119, the total being 180. Root stump caries in anterior teeth were 57, in posterior teeth they were 256 the total being 313. Missing teeth in anterior teeth were numbered 106, in posterior teeth, they are 541, the total being 647. Prosthetic teeth required treatments in anterior teeth were 161, and further in posterior teeth, 739, the total being 900. All the teeth that should be treated amounted to 2, 161, therefore, it was 36.58±0.62% among the total 5, 908 teeth.
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