乳、恒牙釉质及本质体外摩擦行为的对比研究

采用往复式滑动摩擦磨损试验考察了人体乳、恒牙牙釉质及牙本质在人工唾液润滑下的摩擦学性能.结果表明:人体牙的摩擦磨损行为同其微观结构密切相关;恒牙釉质磨痕表面存在轻微擦伤迹象;乳牙釉质的磨损表面主要呈现裂纹和轻微犁沟,二者都存在腐蚀磨损的现象;乳牙和恒牙本质的摩擦磨损行为相似,磨损明显加剧,磨斑表面呈现严重犁削和剥落特征.

Comparative Study of Tribological Behavior of Enamel and Dentin with Primary and Permanent Teeth in Vitro

A reciprocal sliding friction and wear tester was performed to investigate and compare the friction and wear behaviors of enamel and dentin with primary and permanent teeth sliding against Si₃N₄ ball under the lubrication of artificial saliva. The worn surface morphologies and microstructures of the tested teeth were observed by scanning electron microscopy. The wearing capacity was measured by 3D phase shift laser interferometer. It was found that the friction and wear behaviors of the natural teeth were strongly dependent on the microstructures. The permanent teeth enamel had the best wear resistance among the different test samples, there were slight abrasion and scuffing on the surfaces. The primary teeth enamel showed that the flaw and slight scuffing on the appearance of sample. Corrosive-abrasive characteristics appeared on the enamel of permanent and primary teeth. The primary teeth dentin showed similar friction and wear behaviors as the permanent dentin. Contrary to the above, they had relatively weak and fragile microstructures, so there was more severe scuffing and abrasion signs on the worn surface.