钛修复体的口腔生物摩擦学特性研究

目的　探讨牙用钛金属与天然牙的生物摩擦学特性 ,供临床应用参考。方法　在改进后的高精度自控微动实验台上 ,对牙用钛金属TA2与天然牙组成的摩擦副进行人工唾液润滑工况下的摩擦磨损实验。采用计算机控制、动态跟踪实验 ,显微硬度仪、轮廓仪、光镜、激光共聚焦显微镜、扫描电镜与X线衍射能谱仪等测试手段综合分析研究。结果　天然牙的动态摩擦系数为一长“S”形曲线 ;钛对天然牙的磨损过程表现为牙体组织的微切削和组织变性 ;磨损量 :纯钛 /天然牙为 (2 0 33±2 86 ) μm ,纯钛 /纯钛为 (38 0 0± 5 88) μm ,二者间的差异有显著性 (P <0 0 5 )。 结论　天然牙摩擦学性能优良 ,与纯钛的耐磨性匹配 ;咀嚼过程中 ,应该避免较大的咬合力和口腔副功能 ;选择牙科材料时 ,应考虑到材料的耐磨性

An investigation on dental bio-tribological characteristics of prosthesis made of titanium material

OBJECTIVE: This study aimed at investigating bio-tribological property of titanium opposite to teeth as a base of clinical application. METHODS: Under a modified fretting machine, wear tests on human natural teeth were carried out in artificial saliva conditions against to pure titanium. The dynamic frictional process and wear mechanisms were investigated by means of Nene-2, MVK-H12, TALYSURF6, OM, LSM, SEM, EDX. RESULTS: The coefficient of friction exhibited a variation pattern of longs. The wear mechanism of natural tooth was detected as micro-cut and denaturation of dental texture and the wear depth of Ti/teeth was 20.33 + 2.86 microm, the wear depth of Ti/Ti being 38.00 + 5.88 microm (P < 0.05). CONCLUSIONS: The natural tooth has a good tribological behavior, matching the friction behavior of pure titanium. Over occlusal force during masticate process and para-function should be avoided. When we chose dental materials, wear resistance should be taken into account.