WEAR CHARACTERISTICS OF RESIN COMPOSITES FOR CROWN AND BRIDGE

对9种冠桥用树脂复合材料的性能进行了评价。观察填料的形状，填料含量进行评估填料类型，因为那些在树脂复合材料的性能显着影响。并对冠桥树脂复合材料的固化性能进行了测定，包括光固化深度和基体树脂的结构。通过断裂韧性测试、直接拉伸、弯曲和硬度测试评价其力学性能，结果表明，两种冠桥树脂复合材料的填充、固化和力学性能存在显著差异。这些树脂复合材料具有较低的填料含量，和较小的颗粒填料比树脂复合材料的修复。我们可以将用于冠桥的树脂复合材料分为两类。一种用于前牙贴面，另一种用于后牙贴面。这些填料类型和组成在应用类型上存在显著差异。冠桥复合树脂材料的力学性能低于修复体复合树脂材料，采用OHSU型磨损试验机模拟口腔条件下的磨损模式，测定了冠桥复合树脂材料的磨损情况。我们发现某些树脂复合冠桥材料对拮抗牙釉质的磨损率较高。磨损特性不仅受机械性能的影响，而且还受填料性能的影响。这些结果表明，我们必须考虑许多因素，如磨损机的测试条件，拮抗材料，和环境，因为树脂复合材料的冠桥在口腔环境中遭受更严重的条件下，时间更长。

Nine kinds of resin composites for crown and bridge were examined to evaluate those properties. Observations of filler shape, filler contents were performed to evaluate filler type, since those in resin composites affected properties significantly. Curing properties of resin composites for crown and bridge were also measured for the depth of cure with light exposuring units and the structure of matrix resin. Moreover, mechanical properties were evaluated by fracture toughness test, direct tensile, bending, and hardness tests.Filler, curing, and mechanical properties differed in each resin composites for crown and bridge significantly. These resin composites had lower filler contents, and smaller particle fillers than resin composites for restoration. We could classify two types of resin composites for crown and bridge. The one was for veneering to anterior, and the other was for applying to posterior restorations. Those filler type and composition differed in types for applying significantly. Mechanical properties of resin composites for crown and bridge were lower than those of resin composites for restoration.Wear of resin composites for crown and bridge was determined by using an OHSU type wear tester simulating wear patterns in an oral condition. We found some resin composites for crown and bridge had high wear rate for antagonistic enamel. Wear characteristics was not only affected by mechanical properties but also by filler properties. These results suggested that we had to consider for many factors such as testing conditions of a wear machine, antagonistic materials, and environments, since resin composites for crown and bridge suffered more severe conditions in oral environment for longer time.