Even though it is projected that the dental prosthesis will soon be manufactured with CAD/CAM technology, the three-dimensional accuracy of dental prosthesis construction using this technology is not known. We requested each of 5 dental technicians to produce 3 model teeth under each of the following three conditions: the original tooth measurement by visual inspection; the original tooth measurement with calipers; and in the absence of the original tooth, tooth measurement by extrapolation from the existing opposite and adjacent teeth. The reproduced teeth were measured with a laser displacement meter, and the results compared with the original tooth. It was found that the reproduced teeth constructed based on the visual inspection had error of distance of about 500μm. The error of distance was not reduced when the measurement was made using calipers. In general, reproduced teeth made by the dental technicians were deformed. When the technicians attempted to reconstructor eliminated tooth, the error of reproduction increased to about 1000μm.
歯科補綴物の3次元寸法精度に関する研究 : 歯科技工士の3次元再現精度について
matsumoto_shigaku_22-03-07.pdf
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