萠出途上および萠出後間もない第一大臼歯の齲蝕罹患について
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概要
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Sealing of the pit and fissure for the purpose of caries prevention should be done on healthy molars at the earliest chance after the complete emergence of the occlusal surface from the alveolar mucosa. On the other hand, caries attack on the first molar seems to occur, not to a small extent, even in the course of eruption in recent years in Japan.<BR>In order to analyse the caries status in the erupting molar especially before its occlusal surface is sufficiently exposed to receive sealing, an investigation was made in the first molars in a total of 1, 069 subjects, of which 379 children of the 1 st grade of a primary school (mostly 6 years of age with a few 7 years-old) and 255 children of a kindergarten (mostly 5 years of age) were chosen from an urban area in June, 1971, and 352 children of the 1st grade of a primary school in an urban area and 83 children of the 1 st grade of a primary school in a rural area were chosen in June, 1972. The annual sugar consumption per capita at the time of the investigation was about 27.5kg in 1971, and about 28.8kg in 1972.<BR>The examinations were performed in accordance with the classification of the partially exposed occlusal surfaces shown in Fig. 1. The synthetic standard judgment of clinical caries defined in WHO Oral Health Survey (1971) was used. The first molars of the right and left sides, and males and females were put together in calculation.<BR>The percentages of caries attacks on the erupting first molars were 4.5% in the maxilla and 22.5% in the mandible. In addition, the percentages of D and F teeth in the newly erupted first molars were 27.9% in the maxilla and 59.8% in the mandible, indicating a high percentage of the teeth in which the caries preventive sealing is not feasible.
- 有限責任中間法人 日本口腔衛生学会の論文