口腔修复材料对牙本质的磨损性能的研究

Wear matching performance of dental restoration materials oppositing to dentine

目的:研究牙色材料与天然牙本质之间磨损性能的匹配情况。方法:以牙本质为研究对象,以实验组高度抛光的聚合瓷、玻璃陶瓷、氧化锆为摩擦剂,模拟口腔环境,利用微摩擦磨损实验机,研究牙本质与不同材料之间的摩擦磨损性能。采用扫描电镜观察表面形貌,粗糙度仪测粗糙度,维氏硬度仪测表面硬度,电子天平测磨损量。结果:牙本质与3种材料粗糙度近似(P>0.05),硬度小于3种材料(P<0.05)。牙本质与3种材料分别对磨后材料的磨损量大于牙本质对照组的磨损量(P<0.05),牙尖牙本质的磨损量与3种材料及牙本质的硬度值呈显著正相关关系(r=0.840)。其中聚合瓷组的牙本质磨损量与对照组最接近。结论:不同材料对牙本质均会造成不同程度的磨损,聚合瓷具有与牙本质相近的耐磨性能。

Objective： To compare the wear resistance between dentin and dental restoration material in vitro. Methods： The friction and wear behaviors of natural tooth dentin respectively against highly polished polymer ceramic, glass ceramic and zirconia were investi- gated in an artificial saliva test environment by UMT-2 friction and wear testing machine. Worn surface morphology was observed by scanning electron microscopy（SEM） ,roughness was measured by roughness instrument,the rigidity value was weighed by electronic balance. Results. The roughness of the 3 materials was similar to that of dentin （P 〉 0.05）, the rigidity of dentin was less than that of the 3 materials （P 〈 0.05）. After friction and wear test, the abrasion quantity of dentin respectively against the 3 materials was less than that of the materials（P 〈0.05）. There was positive correlation between the wear loss and the hardness of the 3 materials and dentin（ r = 0. 846）. The mass loss of the dentin against Poly Ceramic after grinding abrasion was the closest among the 3 materials. Conclusion： Different materials have varying degrees abrasion against dentine. The Polymer Ceramic has closer abrasion performance with dentin than the other 2 materials.