类金刚石膜在牙科车针表面的初步应用

The effects of the diamond-like carbon film on the abrasive resistance of dental bur

目的:通过类金刚石镀膜(DLC)的方法提高牙科车针的耐磨性。方法:选择临床常用3种类型新车针,每种车针选择同种型号若干支,一组非镀膜作为对照组,一组镀膜作为试验组。对于金刚砂车针:由1名临床经验丰富的医生,使用镀膜与未镀膜车针,按照全冠牙体预备要求磨除离体牙(同一名正畸患者拔除的同名牙),同一根车针磨除5颗离体牙,记录操作者对车针切削能力的主观感受。对于树脂磨头:在相同转速、相同载荷下,对比镀膜与非镀膜磨头穿透树脂块效率。对于低速碳钢球形车针:对同名离体牙进行面Ⅰ类洞型的制备,每根使用3次之后,通过放大75倍的显微镜辅助观察工作端表面锋刃磨耗情况。结果:医生主观感觉镀膜金刚砂车针切削力好于非镀膜的车针。镀膜的树脂磨头穿透效率大于非镀膜树脂磨头。镀膜低速碳钢球形车针的磨耗程度低于非镀膜组车针。3组试验结果的差异均有统计学意义。结论:将DLC膜应用于牙科车针表面,特别是钨钢树脂磨头、低速碳钢球形车针表面,能明显改善切削效率,增加耐磨性,提高使用寿命。

Objective：To study the effect of the diamond-like carbon film（DLC） on the abrasive resistance of dental bur.Methods：Unused new diamond burs,Tungsten steel resin grinding heads and low-speed carbon steel ball burs were divided into two groups respectively,those with DLC coating were used in test group,those without coating were used as the controls.For the diamond bur,an experienced dentist used the coating and non-coating diamond burs respectively to grind the extracted tooth under the standard of all-crown reduction.One bur was used to grind five teeth,the effects of the two groups were judged by the dentist subjective feeling.For the Tungsten steel resin grinding head,the time of breaking through the resin block under the same rotation speed and same load were compared for the coating and non-coating heads.For the carbon steel ball bur,the edge of the ball burs was examined under microscope with the magnification of 75 times after the bur prepared type Ⅰcavity in three extracted teeth.Results：The coating diamond burs were better than the non-coating judged by the dentist subjective feeling.The time of breaking through the resin block of the Tungsten steel resin grinding head in coating group was less than that in non-coating group.The wear of low-speed ball bur in coating group was slighter than that in non-coating group.Conclusion：DLC can increase the cutting efficiency,decrease the wear,and extend the working life of the bur,especially for the Tungsten steel grinding head and low-speed carbon steel ball bur.