某金属鉱山坑内夫の口腔衛生学的研究
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I examined 272 pit workers in the metal mine for dental diseases, especially for gingiva disea ses, which I investigated thoroughly on changes of gingiva and deposit conditions of each individual person year by year. I also examined external wounds in the oral region arising out of duty and furthermore I researched particularily for the causes of stain in the oral cavity as well as its conditions, and then I worked out the preventive measures oral hygienically for the aboves.<BR>I sumarize the results of this study as follows:<BR>1. Any occukational differences are not seen on the conditions of pit workers suffered from dental caries.<BR>2. Dental attrition is found at 77.5%, that seems due to occlusion pressure continusly owing to muscular labor together with crushing powered dusts unconsciously.<BR>3. The cases of gingiva disease are at 72.43%, rather as a high percentage. Observing the above cases year by year, one having healthy gingiva, over 35 years old and working more than 16 years becomes gingivitis at 100% after 5 years, and among which the 50% changes from gingivitis to pyorrhea alveolaris after 5 years.<BR>4. Among pit workers of gingiva disease, pyorrhoea alveolaris is exceedingly increased on the cases more or less forty years old and worked more than 16 years.<BR>5. Occupational accidents in the oral region among the pit workers are at 1.35-1.68% yearly.<BR>6. Resulting from the observation made year by year for the relation between the deposit conditions of dental calculus and gingiva disease in pit workers, one having healthy gingiva suffers from dental calculus comparatively a little, and even though the conditions of gingivitis continue to some degree, the gingivitis shows to change into pyorrhoea alveolaris depended upon an increase of deposited quantity of dental calcus.<BR>7. Deposit of melanin pigment of gingiva is compartively less (27.04%). Even the cases of pyrrhoea alveolaris are at 37.05%. Considering from the aboves, the pit workers suffer much from a' malignant type of pyorrhoea alveolaris, which is a rapid progressive and serious case type, and its recovery seems to be very difficult.<BR>8. Deposit of dental calculus is found in vitry many pit workers at average 99.25%.<BR>9. The deposit cause of dental calculus seems due to powdered dustst and dringking water in, the. pit.<BR>The aboves to be proved with the following:<BR>i. Resulting from a spectroscopic analysis of dental calculus, Pb. Zn. and other metallic elements as the chief composition of mine are detected, which. are not found in the control.<BR>ii. I observed some differences in quantity of Pb. Zn. etc. such as metallic elements in gargled water made at the beginning of work from one made after-finished work.<BR>iii. Comparing gargled water made by unhanled dust worker before entering the pit with one made after the spot inspection, some differences in quantity of Pb. Zn. and other metallic elements are found.<BR>10. Dental calculus in pit workers has Ca.: 31.43% and P.: 13.21%. The dental calculus seems to be adhered firmly with the teeth. Upon the histological view, it is stratified, and the space of its layers becomes narrower according to come nearer to the teeth. The inside of shows layers a retiicuture.<BR>11. An artificial experimental dental calculus made with the mixture of gargled water from a pit worker and granules of powdered dusts has a great difference in metals compared with an experimental dental calculus made with gargled water from an unhandled dust worker, as the latter is not found any Pb. Zn. and other metallic elements. From the above, it can be assumed as powdered dusts get mixed in dental calculus.<BR>12. As to a countermeasure for preventing dusts in pit workers, the preventive for dusting at the scene of labor as well as preventive for inhaling dusts on the part of the workers are important.