Abstract
The purpose of our study was to establish the methods of dental health survey on 1Y6M old children, to find systemic oral diseases and to prevent dental caries.
The subjects were children 1Y6M to 3Y6M of age at the 9 locatities in Japan (Iwanizawa, Morioka, Sendai, Tokyo, Yokosuka, Ibaragi, Tokushima, Hiroshima, Fukuoka), and at every 6 months were examined with respect to their oral condition and habitat factors.
The eruption of deciduous teeth was related to the develpoment of mastication and occlusion, and important for the prevention of dental carise. In this report, the eruption types were examined.
The results were as follows;
The eruption type of deciduous teeth were classified into 12 types. Most of the eruption types at 1Y6M and 2Y0M of age were as follows. _??__??__??_At 2Y6M,3Y0M and 3Y6M of age, many deciduous teeth were completely erupted.
The types which had fewer numbers of erupted deciduous teeth at 1Y6M of ages howed a tendency to transfer to the types with fewer number at 3Y0M of age.
