齲蝕活動性試験に関する研究

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概要

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• In advancing prevention of caries among individuals, from the dental hygiene and clinical standpoint, clarifying caries activities in individuals at a given time is usuful. The caries activity test is a means being tried out for the purpose. At present, various methods have been devised and the indicators include salivary secretion, pH, lactobacilli count, and dental plaque. Which method with its indicator is truely clinically valid still remains to be proved. A total of eighty women ranging in age from 18 to 20 were therefore examined for salivary secretion, pH, and clearance time to determine their validity and effectiveness as the caries activity test along with the Cariostat test and Snyder test. The results were as follows : 1. The salivary secretion ranged from 2.ml/410min to 7.0ml/10min with the average of 4.095±1.126ml/10min per individual. The correlative coefficient with the DMF Teeth Count was -0.366. A negative correlation was found with both counts. However, no significant difference was found in the salivary secretion between the cases with caries occurring in the following eighteen months and the non-occurrence cases. 2. The salivary pH ranged from 6.2 to 7.5 with the average of 6.915±0.300 per individual. The correlative coefficient with the DMF Teeth Count was 0.026 and with the D Teeth Count was 0.146. No correrence with either count was found. No significant difference was either found in the salivary pH between the cases with caries occurring in the following eighteen months and the non-occurrence cases. 3. The salivary clearance time ranged from 6.3 minutes to 18.7 minutes with the average of 11.321±2.652 per individual. The correlative coefficient with the DMF Teeth Count was 0.512 and a positive correlation existed. No significant difference was found in the average clearance time between the cases with caries occurring in the following eighteen months and the non-occurrence cases. 4. In the Cariostat test, the cases with the experimental results in agreement two out of three times accounted for 80%. In the correlation with the DMF Teeth Count, the variance ratio was 11.614 and a highly significant difference was recognized. In the correlation with the D Teeth Count, the variance ratio was 2.239 and no correlation was recognized. However, a trend of ±<〓 and+<〓 was found in the population mean of each class. A trend was also observed that the D Teeth Count of 〓, excluding -, was significantly high. The cases with caries occurring in the following eighteen months accounted for 75% in ±, 33.33% in +, 30% in 〓. 5. In the Snyder test, the cases with the experimental results in agreement two out of three times accounted for 93%. In the correlation with the DMF Teeth Count, the variance ratio was 13.647. In the correlation with the D Teeth Count, the variance ratio was 4.671. A significant difference was recognized in both cases. The cases with caries occurring in the following eighteen months accounted for 100% in -, 83.33% in ±, 41.18% in +, and 27.27% in 〓.

• 九州歯科学会の論文

著者

• 祐田 彰

  九歯大・口衛

• 祐田 彰

  九州歯科大学口腔衛生学教室

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