A new method employing a laser for observation of dental dust scattering.

概要

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We developed a new method for measuring and observing scattered dust with a laser beam. The method employs photographs and an He-Ne laser, which has the properties of directivity, high brightness, monochromaticity, and stability. Dust was photographed as scattered light in the path of a laser beam that was scanned vertically or horizontally. We obtained the following results. (1) The scattering of cutting dust could be observed accurately in three dimensions in photographs taken with the laser. (a) Dust appeared as curling smoke during cutting of an artificial porcelain tooth or an extracted human tooth with a dental micromotor. (b) Dust appeared as a cloud during cutting of an extracted human tooth with an air turbine. (c) It could be seen that scattered dental dust was sucked up sufficiently and effectively with the local exhaust apparatus that we used. (2) Our method is an effective means for various studies in industrial hygiene, such as those involving cutting work or local exhaust systems.
有限責任中間法人日本口腔衛生学会の論文