不同年龄段天然牙的摩擦磨损行为研究

采用往复滑动摩擦磨损试验台考察了不同年龄段的天然牙同钛合金配副时的摩擦学性能.结果表明:天然牙的摩擦磨损行为同年龄密切相关,早期和中期恒牙的摩擦磨损行为相似,磨损表面主要呈现轻微擦伤迹象,中期恒牙的抗磨性能最佳;乳牙及晚期恒牙的摩擦系数变化波动较大,抗磨性能不佳,磨损表面主要呈现严重犁削和剥落特征.

Tribological Behavior of Natural Teeth of Different Ages

A reciprocal sliding friction and wear tester was performed to investigate and compare the friction and wear behaviors of natural teeth of different ages sliding against titanium alloy under the lubrication of artificial saliva. The microstructures and worn surface morphologies of the tested teeth were observed with an optical microscope and co-focus laser scanning electron microscope. It was found that the friction and wear behaviors of the natural teeth of different ages were strongly dependent on the age, which was related to the different microstructures of the teeth at different ages. Namely, the early-stage permanent teeth showed similar friction and wear behaviors as the medium-stage permanent teeth, and the medium-stage permanent teeth had the best wear-resistance among the teeth of different ages. This was because the medium-stage permanent teeth had the most compact and strong microstructure, which contributed to preventing them from severe scuffing and abrasion in a long run. Contrary to the above, the primary teeth and later-stage permanent teeth had relatively fragile and weak microstructures, therefore they showed relatively poorer wear-resistance than the early-stage and medium-stage permanent teeth, owing to the liability to be scuffed and abraded. This accounted for the more severe scuffing and abrasion signs on the worn surface of the primary teeth and later-stage permanent teeth as compared to that of the early-stage and medium-stage permanent teeth as well.