In the“Morinaga Dry Milk”incident, the affected infants were those for whom the powdered milk served as the main food and who were physically and mentally in the developing process.
In Osaka, an epidemiological study group was organized with several departments. In one section of it, a dental survey was made.
The results obtained were as follows;
1. DMF rate (97.57%) was above average (same age).
2. Tooth enamel hypoplasia was found to be much higher than average. Enamel hypoplasia of the anterior teeth was found most frequently, followed by the pre-posteaior teeth, and the posterior teeth, in descending order.
3. Prevalence rate of gingivitis was 41.46%. Melanin pigmentation of the gingiva was found to be 50.60%. and 71.43% of these cases had pigmentation in other areas of the body as well.
4. Regarding the states of occulusion, the incidence of Aangle II was 27.27% and of Angle III 26.83%.