工場の歯科衞生學的研究 : I. 酸取扱工場における歯牙酸蝕症

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For the purpose of studying the tooth erosion by acid, the author has investigated the teeth of a factory laborers in North Kyushu, and has carried out a series of experiment concerning the protecting measures against the tooth erosion by acid The results are as follows;- 1. The percentage of laborers suffering from the tooth erosion is twenty six among fifty six, namely fourty percent. 2. It was confirmed that the longer the service years the higher the rate of the patients. 3. Percentage of dental caries, average number of existing teeth, and health index of first molar are respectively worse in the member suffering from the acidic erosion as compared to the healthy member. 4. Average number of eroded teeth is 4.45, and the major part of the tooth number attacked by the erosion was occupied by central incisors, becoming fewer toward posterior teeth. 5. The shape in which the tooth was attacked by the erosion varies according to the types of individual incisal occlusion. 6. Experimentally, extracted teeth were exposed to the acidic air of the factory to know how tooth enamel is dissolved. Dissolution of enamel began in four experimental hour and progressed thereafter. The enamel exposed to acidic air showed a rough surface, while the enamel of the tooth immersed in water remained smooth. 7. For the protection against acidic erosion, ammoniacal silver nitrate was the most advantageous to which succeeded silver flouride and silver ferrocyanate. From the above stated data, a few prophylactic measures will be better adviced. a) Prevention of acid leakage. b) Dilutin of acidic air through good ventilation. c) Hygienic management of factory environment. d) Individual sanitation, routine removing of tooth plaque and deposition. e) Prohition of talking during work, cleansing of mouth after meal, use of alkaline gargle. Use of gas mask are most advisable which will be substituted simply by using gauze mask immersed in bicarbonate of soda solution. Or give chewing gum containing ammonium salt and fluoride for the purpose of neutralizing saliva and cleansing mouth. f) We are convinced that the disease will be supressed in some extent by hardening the tooth enamel through the coating of ammoniacal silver nitrate or silver fluoride. The most efficient is to apply to the tooth crown once a month the Neo-Fluorigen which is consisted from two parts of natrium-fluoride, one part of celluloid, and Ioo part of amylacetate.
九州歯科学会の論文
1953-12-20

工場の歯科衞生學的研究 : I. 酸取扱工場における歯牙酸蝕症

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