歯肉退縮に関する研究
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By dental examination of workers engaged in heavy muscular labor and exposed to high temperature it is observed that they are frequently (58%) suffering from gingival atrophy. It occurs ususually at the gum margin on the palatal side of the first or second molar teeth of the upper jaw, rarely also on the lower jaw. Occasionally the second premolar teeth are attacked. It resembles the senile or juvcnile atrophy of the gingival margin, and is most conspicuous at the central part of toothneck. Other workers engaged in heavy muscular labor but not exposed to high temperatureand those engaged in light labor show also the similar sign of atrophy, but less frequently, 46% and 12% respectively. The morbidity rate of caries is practically the same among the three kinds of laborers (79-85%). But gingivitis, teeth calculus and alveolar pyorrhea are more frequent among the heavy workers exposed to high temperature than among the light workers. What is the etiology of this gingival atrophy? Since the heavy workers exposed to high temperature perspirate profusely, and since vitamin C is excreted in sweat, deficiency of vitamin C due to profuse perspiration may be suspected as a cause of the atrophy. Actually it is proved by vitamin C test in urine that the heavy workers exposed to high temperature are suffering from deficiency of C. In order to substantiate this finding, guinea pigs were fed with oat and C-avitaminosis was produced. The animals thus fed developed the sign of gingival atrophy. Macroscopic as well as microscopic examinations proved that the atrophic change is similar to that observed in human beings, suggesting that vitamin C deficiency may most probably be the principal etiology of the gingival atrophy.
- 九州歯科学会の論文
- 1957-03-31
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