表面抛光和上釉对Y-TZP全瓷表面粗糙度及磨耗性能的影响

Effects of different polishing and glazing procedures on the surface roughness and wear behavior of dental Y-TZP zirconia ceramic

目的研究表面抛光和上釉处理对氧化锆全瓷表面粗糙度及磨耗性能的影响。方法制作氧化锆全瓷试件18个,随机分成3组,每组6个,第一、第二组分别进行表面抛光、上釉,第三组不处理。测量各组表面粗糙度(Ra)值,并通过磨耗实验,以天然牙釉质为对照组,计算各组试件磨耗实验后自身及对磨滑石瓷的体积损失量。结果抛光、上釉、未处理组的表面粗糙度值分别为(0.358±0.020)、(0.384±0.011)、(1.597±0.068)μm,抛光、上釉组均小于未处理组(P<0.01),抛光组和上釉组无统计学差异(P>0.05)。被测试件磨耗后体积损失量均小于天然牙(P<0.01),其中抛光组小于上釉组(P<0.01)。各组的对磨滑石瓷体积损失量均大于天然牙(P<0.01),其中抛光组小于上釉组(P<0.01)。结论上釉和抛光氧化锆全瓷表面能达到同样的光滑度。抛光氧化锆全瓷表面对对颌牙釉质的磨耗量及自身的磨耗量均小于上釉表面。

Objective To investigate the effects of different polishing and glazing procedures on the surface roughness and wear be- havior of dental zirconia ceramic. Methods 18 zirconia ceramic specimens were made and randomly divided into three groups （ n = 6） ： two groups were respectively treated with polishing and glazing, the surface of the third group was treated with nothing. Surface rough- ness values were measured. The volume loss of opposite talcum ceramic and tested specimens as well as natural enamel was also meas- ured by the wear test. Results The surface roughness values of each group were （0.358±0.020） , （0.384±0.011）, （1.597±0.068） μm. The surface roughness values of polished and glazed specimens were significantly lower than the specimens that were not treated（ P 〈0.01 ）. There was no significantly difference between the surface roughness values of polished and glazed specimens （P〉0.05）. The volume loss of tested specimens was significantly less than the nature enamel（ P〈0.01 ）. The volume loss of polished specimens was sig- nificantly less than the glazed ones（ P〈0.01 ）. The volume loss of opposite talcum ceramic among groups was significantly more than the nature enamel（ P〈0.01 ）. The volume loss of opposite talcum ceramic by polished ceramics was significantly less than that of glazed ones（P〈 0.01 ）. Conclusion The polishing procedures of zirconia ceramic surface are clinically acceptable compared with glazing. Polished zirconia ceramic uses less material and antagonist wear than the glazed one.