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目的探讨牙釉质和牙本质磨损特性。方法选用正畸拔除的前磨牙制作牙釉质和牙本质样本,进行摩擦磨损实验。记录摩擦力矩数,测量磨斑宽度;扫描电镜(SEM)观察磨斑形貌;能谱仪(EDS)分析元素变化。结果摩擦系数-时间曲线图发现牙釉质波动幅度大于牙本质。磨斑宽度润滑时牙釉质(5.92±0.67)mm,牙本质(7.40±0.38)mm,干摩擦时牙釉质(8.71±0.44)mm,牙本质(11.02±1.02)mm,磨斑比较差异有统计学意义(P<0.05);维氏显微硬度值牙釉质(300.6±60.7)高于牙本质(48.6±4.0)(P<0.05)。SEM观察主要犁沟和磨粒,牙釉质偶见组织碎片。EDS发现铁元素的出现。结论牙釉质和牙本质具有良好的磨损特性,牙釉质优于牙本质。
Objective To investigate the wear characteristics of enamel and dentin. Methods The enamel and dentin samples were prepared by orthodontic extraction of premolar and tested for friction and wear. The friction torque was recorded and the width of the grinding spot was measured. The morphology of the wear scar was observed by scanning electron microscopy (SEM). The elemental changes were analyzed by EDS. Results Friction coefficient-time curve showed that enamel fluctuated more than dentin. (5.92 ± 0.67) mm, dentin (7.40 ± 0.38) mm, enamel (8.71 ± 0.44) mm, dentin (11.02 ± 1.02) mm, (P <0.05). The Vickers microhardness value of enamel (300.6 ± 60.7) was higher than that of dentin (48.6 ± 4.0) (P <0.05). SEM observation of the main furrows and grit, tooth enamel occasionally tissue fragments. EDS found the presence of iron. Conclusion Enamel and dentin have good wear characteristics, enamel is better than dentin.