某工場女子工員の同一個人10年間の出生年度別および歯牙別齲蝕罹患推移について-2-第二大臼歯の齲蝕罹患推移について

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Authors observed DMF transition of second molars for 10 years on the particular 119 female package wrappers from their ages 15 to 25. These subjects were born during 1932 and 1938, entered a firm at the age 15 after finishing their compulsory education and served in the firm for more than 16 years. The comparison of the results of the recent observation with that of DMF transition of first malars observed some years is as follows. 1. Percentage of DMF At the time when the subjects just entered to the firm, the percentage of DMF was 67% for those who were born in 1932, 30% to 40% for those who were born in 1933 to 1937 and 9% for those who were born in 1938. Nearly all groups, however, showed remarkable changes during the two year period when the subjects grew up from 16 to 18 years of age, the percentage ranging between 35% to 87%. 2. Percentage of D teeth Each group, without exception, showed conspicuous fluctuations. On an average, the rate rose in a steady curve, showing 12.5% at 15 years of age, 30%, as a peak, at 22 years of age, and thereafter the rate fell down. 3. Percentage of M teeth The percentage of M teeth naught in 1933, 1934, 1935 and 1937 groups, but it was 1% at 23 years of age and 3% at 24 years of: age 1932 group, 2% at 17 years of age and 3.5% at 22 years of age in 1936 group and 2% at 22 years of age in 1938 group, which showed a general fall in percentage. 4. Percentage of F teeth With slight fluctuations among the groups, all assumed an upward curve, especially in 1936 group the rate of M teeth rose from 4% to 46.5%. 5. Percentage of DMF teeth A remarkable upward trend was seen in each group. The average rate of DMF teeth rose from 16% to 58%. The percentage of D teeth rose in a gentle curve: 12.5% at 15 years of age and 30%, as a peak, at 22 years of age, then a low rate followed. While the percentage of F teeth increased gradually for some years, the rate of M teeth was low. 6. Comparison of first molar and second molar with average DMF In the percentage of D teeth, first and second molars showed the same or nearly the same rate. But in the percentage of M teeth first molar showed a higher rate than second molar, the former showing a lower rate than the latter in F teeth. In these graphs both the rates of DMF and DMF teeth of second molar were higher than those of first molar. From above mentioned reasons authors concluded that dental health management in this firm is higher than the average level. And if a more positive work of this health management is made, the rates of D and M teeth may be lowered and thereby the rate of F teeth may be raised.
有限責任中間法人日本口腔衛生学会の論文

某工場女子工員の同一個人10年間の出生年度別および歯牙別齲蝕罹患推移について-2-第二大臼歯の齲蝕罹患推移について

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