Fan P L, Powers J M, Reid B C
J Am Dent Assoc. 1981 Sep;103(3):408-11. doi: 10.14219/jada.archive.1981.0354.
Two improved stone die materials (Duroc and Silky Rock) used with water and with a hardener, one resin die material with dispersed metal powder (Die-Met), and copper and silver electroplated metal die materials were evaluated for surface mechanical properties. The improved stone dies had the highest surface roughness, intermediate surface hardness and the highest loss of material in two-body abrasion. The use of a hardener decreased the surface roughness, but did not improve abrasion resistance. The improved stone dies, with or without hardener, showed brittle failure in single-pass sliding at low normal loads. The resin dies had the lowest hardness. The unfilled resin die had low surface roughness and was similar to metal dies. The resin-metal die had a surface roughness similar to the improved stone dies. The presence of dispersed metal powder in the resin did not increase the hardness. Both resin die materials had intermediate values of material loss in two-body abrasion and showing tensile cracking and loss had intermediate values of material loss in two-body abrasion and showed tensile cracking and loss of material on single-pass sliding at medium normal loads. The metal dies had the highest hardness and the least surface roughness. They also had the lowest material loss in two-body abrasion. The metal dies showed ductile behavior in single-pass sliding.
对两种改良的石模材料（杜洛克石和丝滑岩）在加水和添加硬化剂的情况下、一种含分散金属粉末的树脂模材料（金属模）以及铜和银电镀金属模材料的表面机械性能进行了评估。改良的石模具有最高的表面粗糙度、中等的表面硬度以及在两体磨损中最高的材料损失。使用硬化剂可降低表面粗糙度，但并未提高耐磨性。无论有无硬化剂，改良的石模在低法向载荷下单程滑动时均表现出脆性破坏。树脂模的硬度最低。未填充的树脂模表面粗糙度低，与金属模相似。树脂 - 金属模的表面粗糙度与改良的石模相似。树脂中分散金属粉末的存在并未增加硬度。两种树脂模材料在两体磨损中的材料损失值处于中等水平，并且在中等法向载荷下单程滑动时表现出拉伸开裂和材料损失。金属模具有最高的硬度和最小的表面粗糙度。它们在两体磨损中的材料损失也最低。金属模在单程滑动中表现出韧性行为。
