微瓷聚合树脂嵌体和复合树脂嵌体磨耗性的对比研究

目的:对比研究一种微瓷聚合树脂嵌体和3种复合树脂嵌体的磨耗性能,为临床应用提供参考。方法:应用CETR,Inc(美国)UMT-2微摩擦磨损实验机模拟口腔咀嚼状态,在人工唾液环境下将微瓷聚合树脂Ceram-age(C)和3种复合树脂Brilliant new line(B)、Z350(Z)、P60(P)按树脂嵌体固化方法制成试件与天然牙对磨,称重法计算磨损量,扫描电镜观察磨损表面形貌。结果:4种树脂磨损量从小到大依次是Z、P、B、C。Z与其他3种树脂均有显著性差异(P<0.05),Z350显示了最低的磨损量。将各种树脂每6000次磨损量均数进行比较,C树脂磨损量随磨损次数增加呈减少趋势,B、Z树脂则先减少后趋于稳定。扫描电镜下各材料的摩擦表面形貌显示了不同的磨损特征。结论:纳米树脂Z350无机填料含量高、粒径小(5～20nm),二次固化后拥有优良的耐磨性能,是制作树脂嵌体的理想材料之一。

Wear Resistance of Micro- ceramic Polymerized Resin Inlay and Composite Resin Inlay

Objective: To evaluate and compare the wear resistance of one type of micro-ceramic polymerized resin inlay and three types of composite resin inlays.Methods: The wear of one type of micro-ceramic polymerized resin Ceramage(C)and three types of composite resins which were Brilliant new line(B),Z350(Z) and P60(P) with same rough surface opposing enamel was respectively evaluated in a wear simulator of UMT-2(USA).All the test pieces were solidified as resin inlays.Wear resistance was assessed with weight loss.The worn surfaces were observed by scanning electron microscope(SEM).Results: The ranking of weight loss from the least to the most was: Z,P,B,C(P<0.05).Significant difference was found between Z and P,Z and C,Z and B.Z350 showed the least weight loss.Comparing the means of weight loss of each resin after every 6000 strokes,C’s weight loss become less and less when the number of strokes increased.While the weight loss of B and Z first reduced and then stabilized.Four types of materials’ surfaces after 18000 strokes showed different characters through the observation of SEM.Conclusion: Z350 is ideal as the material of inlay simply according to wear resistance.