| 摘要 |
PURPOSE:To obtain in a short time an abrasion test result which well coincides with clinical test results, and to omit actual clinical tests, by abrading a dental material with an abrasive having a specified grain size distribution and a specified Mohs' hardness. CONSTITUTION:An abrasive (glass beads, SiC, emergy, etc.) is used whose grain size ranges from 1mu to 200mu when the cumulative value of its cumulative volume distribution is 50%, and whose Mohs' hardness is >=3 (preferably from 6 to 7 comparable to Mohs' hardness of the enamel of the natural teeth). Abrasive grain is permissible to use, whose radius of curvature ranges from 0.1Xr-0.3Xr [where (r) is the grain diameter for the 50% grain size distribution], instead of the perfectly spherical. A piece of a dental filling material or a dental prosthetic material to be tested is fixed to a fixing tool 4, brought into close contact with a grinding plate 7, immersed in a vessel 5 which is filled with the above abrasive and water, and loaded with a weight 2. Then, abrasion amount by reciprocating motion of the vessel 5 is determined. Thus in a short time, a test result is obtained with a small error in comparison with clinical test results. |
