人牙釉质在人工唾液润滑下与不同偶件对摩时的摩擦学性能研究

在往复滑动摩擦磨损试验台上对比考察了人牙釉质自配副及其同钛合金和纯钛配副时的摩擦学性能.结果表明:牙釉质/牙釉质的稳态摩擦系数约为1.00,其磨损表面釉柱清晰可见,磨损机制表现为剥落和轻微犁削并存;牙釉质/钛合金的稳态摩擦系数约为0.92,磨损表面既有犁沟又有剥落,可以看到轮廓分明的釉柱;牙釉质/纯钛的稳态摩擦系数约为0.87,磨损表面存在纯钛转移膜.从摩擦系数的变化趋势、稳态摩擦系数的大小、磨损表面形貌和磨痕深度等角度来看,牙釉质/钛合金与牙釉质/牙釉质的摩擦磨损行为较为相似.

Study on Tribological Behavior of Human Enamel Sliding against Various Counterparts under Lubrication of Artificial Saliva

The tribological behaviors of human tooth enamel sliding against human tooth enamel, titanium alloy, and pure titanium, under the lubrication of artificial saliva, were investigated and compared by conducting interval reciprocal friction and wear testing on a ball-on-flat test rig. The worn surface morphologies were observed on an optical microscope and a coincident focus laser-scanning microscope. It was found that the flat enamel specimen sliding against the spherical counterparts made of human tooth enamel, titanium alloy, and pure titanium had stable friction coefficients of 1.00, 0.92, and 0.87, respectively. It showed differences in the friction and wear behavior and the worn surface morphology, depending on the spherical counterparts. Namely, the worn surface of the enamel sliding against the spherical enamel was characterized by delamination and slight abrasion, and the enamel rods were visible on the thereon. Some ploughs, delamination scars, and enamel rods were observed on the worn enamel surface sliding against the titanium alloy counterpart, while transferred Ti film was formed on the worn enamel surface sliding against pure Ti counterpart. In terms of the evolution and stable value of the friction coefficient and the worn surface morphology and wear scar depth, the enamel/titanium alloy pair was similar to the enamel/enamel pair.