低年齢児におけるうしょく発症とその影響因子に関する追跡調査研究 とくに数量化理論２類による

Abstract

The purpose of this study was to analyze the factors inducing caries. These factors were analysed by using data from the surveys of the same children at the ages of 18 months and 3 years.At the age of 18 months, caries-free children were classified as type O2 by the presence of plaque and/or white spot enamel region, and others were classified as type O1. In these two groups we analyzed on the relationship between caries incidence and three different backgrounds. These backgrounds were environmental, health and daily habit factors. We also analyzed the relationship between each daily habit factor and environmental factors. The results were as follows:1. Both O1 and O2 type were analyzed in regard to environmental, health and daily habit factors by using Hayashi's Quantification Scaling Type 2 Method. The criterion variables were divided into 3 groups: a caries-free group, a group with caries of the anterior region only, and a group with caries of the posterior region. These were determined at the age of three.2. Environmental and health factors had the discriminant principal components. The first one was characterized by the presence or absence of molar caries, and the second by the presence or absence of caries.3. In the O1 type, there were two discriminant principal components in the daily habits. The first one was regularity of daily life, which characterized the caries occurence of the anterior teeth only or of the molar caries. The second one was irregularity of daily habits during the period from 18 months to 3 years old, which characterized the presence or absence of dental caries at the age of three. The children with caries of the anterior teeth showed regularity of daily life and good conditions at home. On the other hand, the children with molar caries had no regularity of daily life and a poor environment at home. The caries-free group showed restriction or control of intake of sweets and habitual brushing by their mothers. The two caries-positive groups showed a tendency that was the opposite of the caries-free group.In the O2 type, parental care at the age of 18 months was the first discriminant principal component, which characterized the presence or absence of anterior teeth caries. The caries-free group showed good daily habits at the age of 18 months. The children with anterior teeth caries had poor habits. The second discriminant principal component was control of eating habits during the period from 18 months to 3 years, which characterized the presence or absence of molar caries. Caries-free children showed good eating habits during this period and brushed their own teeth more than twice a day at the age of three. Children with molar caries showed the opposite tendency at the age of three.4. The Type 2 Method of Hayashi's Quantification Scaling was applied to the analyses on the relationship between each category of daily habits and environmental factors. Each category and change was used as the criterion variables. There were some problems regarding eating habits and contents of meal at the age of 18 months. At this time, the monthers' ages were between 21 to 27. There were some problems regarding stopping bottle feeding in the first or second child among the group of mothers who were over 31. There was some tendency toward prolonged bottle use, delayed toilet training, finger sucking, and beverage intake during the night in the families comprising three generations, where the mothers were over 31. Regional difference had the most influence on snack intake.