口腔修复体材料与天然牙的磨损匹配性研究

Study on Wear Matching Ability of Dental Prosthesis Against Natural Tooth

以人工唾液为润滑剂,采用新鲜拔除的天然牙与TC4钛合金以及氧化锆陶瓷平面试件进行低速往复磨损实验。分别从定性和定量分析两个角度研究了口腔修复体材料与天然牙的磨损匹配性。同时,提出了基于逆向工程技术的天然牙最大磨损深度的测量方法,将磨损前后的天然牙进行三维扫描,采用最佳拟合对齐法实现模型的配准。通过对天然牙磨损表面及对摩试件的三维形貌和能谱分析,明确了天然牙与TC4钛合金之间的磨损机制主要表现为磨粒磨损和黏着磨损,而与氧化锆陶瓷之间的磨损更为轻微,主要表现为磨粒磨损。对比天然牙和对摩试件的磨损量可知,氧化锆陶瓷相比于TC4钛合金表现出良好的耐磨损性能和对摩物的低磨损率。

The tests were carried out under artificial saliva lubrication condition by using freshly extracted natural teeth against TC4 alloys and zirconia ceramic samples. Wear matching ability was investigated by qualitative and quantitative analysis. Meanwhile,teeth wear loss measurement method was proposed based on reverse engineering,which used optimum fitting alignment to realize the model registration for point cloud. According to the 3-D Profile and energy spectrum analysis,the wear mechanism between natural teeth and TC4 alloys presented as adhesive wear and abrasive wear. However,only abrasive wear was found between zirconia ceramic and natural teeth. The results also indicated that zirconia ceramic yielded superior wear resistance and lower antagonistic wear rate compared to TC4 alloys.