Effect of Filler Particle Size on Wear Resistance of Resin Cement

本研究旨在探讨填料粒径对树脂水泥耐磨性的影响。本研究测试的材料是四种实验性双固化（DC）树脂水泥（日本Kuraray公司），它们含有不同尺寸的填料。拔除的臼齿尖牙用600粒碳化硅纸磨成平面咬合面。在每颗牙的咬合面准备一个矩形的空腔。然后使用CEREC 2系统制造陶瓷镶嵌体。根据制造商的说明，用不同的实验树脂胶结剂和胶粘剂体系粘合嵌体，用800粒度碳化硅纸对修复后的表面进行湿磨抛光。每种树脂水泥制备6个试样。一半试样进行20万次三体磨损试验，另一半试样进行3万次牙刷磨损试验，均采用体外磨损试验装置。使用轮廓仪（Surfcom 475 a, Tokyo Seimitsu）在8个不同的点上扫描和跟踪树脂水泥的磨损更严重的表面。制作复制品并在扫描电镜下观察。在各自的轮廓示踪上测量每种树脂水泥的垂直间隙深度作为磨损值。数据采用单因素方差分析进行统计学分析。结果表明：除了树脂水泥I和树脂水泥iv的磨损值外，两种树脂水泥的磨损值之间存在显著差异。牙刷磨损试验结果表明，填充量大的树脂水泥磨损最小。另一方面，三体磨损试验显示了不同的结果。填充量大的树脂水泥磨损最大。扫描电镜观察发现，牙刷磨损试验后树脂胶结物IT和III的磨损表面有填料颗粒突出，三体磨损试验后颗粒脱落造成细小缺陷。填料粒径小于1.0 μ m的树脂水泥I和树脂水泥IV的磨损表面似乎比其他水泥更光滑。少

The purpose of this study was to evaluate the effect of filler particle size on wear resistance of resin cement. Materials tested in this study were four experimental dual-cure (DC) resin cements (Kuraray Co., Japan), which contained fillers of different sizes. The cusps of the extracted human molars were ground to a flat occlusal surface using a 600 grit silicon carbide paper. A rectangular cavity was prepared in the occlusal surface of each tooth. Ceramic inlays were then fabricated using the CEREC 2 system. The inlays were cemented with the respective experimental resin cements and adhesive systems according to manufacturer's directions, The restored surface was finished and polished by wet-grinding with 800 grit silicon carbide paper. Six specimens were prepared for each resin cement. Half of the specimens were subjected to three-body wear test for 200,000 cycles, and the others were subjected to toothbrush abrasion for 30,000 cycles, both using an in vitro wear testing device. The … More worn surface of the resin cement was scanned and traced, using a profilometer (Surfcom 475 A, Tokyo Seimitsu) at 8 different points. Replicas were made and observed under SEM.The vertical gap depth of each resin cement was measured on the respective profilometric tracing as the wear value. The data was statistically analyzed by one-way ANOVA.The results are as follow :There were significant differences among the wear values of the resin cements for both wear test, except for those of resin cement I and resin cement IV.The results of the toothbrush abrasion test showed that resin cement with large filler exhibited the least wear. On the other hand, the three-body wear test showed a different result. The resin cement with large filler exhibited the most wear. SEM observation showed filler particles protruding from the worn surface of resin cements IT and III after toothbrush abrasion testing and small defects caused by the exfoliation of particles after three-body wear testing. The worn surfaces of resin cement I and IV with filler particle size of less than 1.0 mum were seem to be smoother than those of the other cements. Less