A study of the life span of lower first molars from the reports on the survey of dental diseases in Japan.
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概要
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A nationwide survey of dental diseases in Japan has been performed five times, i. e., in 1957, 1963, 1969, 1975 and 1981. The survival rate curve and life span of the respective teeth were published in the report on the survey of dental diseases in 1981. Two rises were seen on the survival rate curve of the lower first molars, the first in the 10 to 14 years age group and second between 35 and 49 years of age. The pepole who were born between 1932 to 1946 and grew up during the second world war or immediately after constituted this second rise in 1981.<BR>The second rise was seen on the survival curve of the lower first molars in last five surveys (see Table 1). We believe that the second rise was caused by the lower consumption of sugar.<BR>If the influence of lower consumption of sugar were removed from consideration, the second rise would be flattened and the life span of the lower first molars would be shortened 1.6 to 1.7 years (Fig. 3). If the influence of lower consumption of sugar were continued and the survival rate of the 15 to 39 year olds shifted to the highest past value, the life span of the lower first molars would be prolonged 1.1 to 2.2 years (Fig. 4 and 5).<BR>The average age of 14 present teeth was calculated. In 1981, this was 63.59 years in males and 59.00 years in females. The variation of thease ages was 0.96 years in males and 1.12 years in females during the past 25 years.<BR>We considered that the life span of the lower first molars of Japanese was based on middle aged groups in 1981, so it is important to provide comprehensive dental care for middle-aged persons to prolong the life of their teeth.
- 有限責任中間法人 日本口腔衛生学会の論文
有限責任中間法人 日本口腔衛生学会 | 論文
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