Wassell R W, McCabe J F, Walls A W
Department of Restorative Dentistry, Dental School, Newcastle Upon Tyne, England.
J Dent Res. 1994 Sep;73(9):1546-53. doi: 10.1177/00220345940730091001.
Enamel abraders used in two-body wear tests suffer the disadvantage that standardization is difficult or impossible to obtain. The aim of this study was to test whether steatite (a ceramic material with a Vickers Hardness similar to that of enamel) could be used as a satisfactory human enamel analogue. The friction and wear characteristics of 'spherical' abraders made from these two materials against composite and amalgam specimens were therefore compared. A two-body wear test for restorative materials was devised which could be carried out in a Universal Testing Machine and which allowed for continuous monitoring of the frictional forces during wear. The results showed that steatite and enamel abraders produced similar coefficients of friction (correlation coefficient, r = 0.98). A linear relationship was found between depth (and volume) of wear and number of cycles (r = 0.98 to 0.99). Wear rate was not affected by the increase in abrader facet area. The wear rate against the steatite abrader was slightly greater than that against enamel, but the two abraders were reasonably correlated (r = 0.94). Friction and wear were correlated for the steatite abrader (P < 0.05, r = 0.88) but not the enamel abrader. The hybrid composites had a high wear rate and wore both the abraders more than did the microfilled composites or amalgam. These findings suggest that steatite is a suitable substitute for enamel in this type of test.
用于双体磨损试验的牙釉质磨损模拟器存在难以或无法实现标准化的缺点。本研究的目的是测试滑石（一种维氏硬度与牙釉质相似的陶瓷材料）是否可作为令人满意的人类牙釉质类似物。因此，比较了由这两种材料制成的“球形”磨损模拟器对复合材料和汞合金试样的摩擦和磨损特性。设计了一种用于修复材料的双体磨损试验，该试验可在万能试验机中进行，并允许在磨损过程中持续监测摩擦力。结果表明，滑石和牙釉质磨损模拟器产生的摩擦系数相似（相关系数，r = 0.98）。发现磨损深度（和体积）与循环次数之间存在线性关系（r = 0.98至0.99）。磨损率不受磨损模拟器刻面面积增加的影响。相对于滑石磨损模拟器的磨损率略高于相对于牙釉质的磨损率，但两种磨损模拟器具有合理的相关性（r = 0.94）。滑石磨损模拟器的摩擦和磨损具有相关性（P < 0.05，r = 0.88），而牙釉质磨损模拟器则不然。混合复合材料的磨损率很高，并且比微填料复合材料或汞合金对两种磨损模拟器的磨损都更大。这些发现表明，在这类试验中，滑石是牙釉质的合适替代品。
