支台歯形成における表面性状の変化 : フィニッシングラインについて

概要

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The present study was scheduled to investigate the effects of the abrading tool and pressure on the performance of tooth preparation. Extracted human teeth were prepared for knife edge, chamfer or shoulder type full crown with regular and polishing diamond cylindrical stones under a pressure of 40gf or 100gf. Impressions of the prepared abutment teeth were then taken with a vinyl silicone impression material to make plaster dies. Precision of the finishing line and surface roughness were examined for the abutments and dies. When the regular diamond stone was used, it was found by the scanning electron microscopy that there were many large enamel chips on the finishing line. The prepared surface was smoother but the enamel chip was more marked in size and number by abrading under a pressure of 100gf than 40gf. The use of the polishing diamond stone could produce fairly smooth surface and caused no chips on the finishing line. The chips larger than 50μm in size on the teeth were nearly reproduced on the plaster dies, while those smaller than 20μm almost disappeared on the dies. Thus, it was found important to prepare the teeth under a pressure as light as 40gf and subsequently polish it with a fine diamond stone for preventing enamel chipping around the finishing line.
九州歯科学会の論文
1994-12-25