中文摘要：

目的研究遮色瓷的表面粗糙度对烤瓷熔附金属修复体明度和反射率的影响。方法铸造厚度1．0mm、直径12．0mm的镍铬合金试件48个，平均分为A～F组，每组8个，用松风HaloA2色粉剂遮色瓷进行遮色（厚度0．3mm）。A组不进行打磨，作为对照；B、C、D、E、F组分别用200、400、600、800、1000目的水砂纸打磨遮色瓷；然后用表面粗糙度测试仪EX2154—13N量各组的表面粗糙度，用PR-650型光谱扫描色度仪测量色度学参数（明度和反射率）。测量完成后，各组试件上体瓷和釉质瓷，再次测量色度学参数。测量结果由SPSS13．0统计软件进行方差分析。结果经200—1000目水砂纸打磨后，遮色瓷表面粗糙度由（0．706±0．082）μm降低至（0．226±0．069）μm，遮色瓷的反射率由78．671±3．408降低至72．386±3．953，明度也由93．496±1．070同时降低至90．189±1．200；上体瓷和釉质瓷后，随着表面粗糙度的降低，反射率由81．529±4．028降低至76．301±3．097，明度值则由84．604±2．964降低至80．694±1．564。随着表面粗糙度的降低，反射率和明度值均呈递减趋势。结论遮色瓷粗糙度对烤瓷熔附金属修复体的最终明度和反射率有影响，在本实验范围内最佳遮色瓷粗糙度为0．23～0．50μm。

英文摘要：

Objective The purpose of this study was to investigate how different surface roughness of opaque porcelain influence reflectance and CIE L＊ value of porcelain fused to metal （PFM） restorations. Methods 48 casted Ni-Cr alloy metal specimens（12.0 mm×1.0 mm） were fabricated with ShoFu Vintage Halo porcelain and divided into six groups, eight pieces for each group. The specimens in the first group without polishing were used as control. Other groups were polished against 200-, 400-, 600-, 800-, and 1 000-grit sandpaper after sintered, respectively. Surface roughness and color parameters of the specimens were measured with a Surface Roughometer EX2154-13 and a spectrocolorimeter, respectively. Ra （arithmetical mean deviation of the profile） was the main standard value to describe the surface roughness of many kinds of meatal or porcelain materials, and here we used it to express surface roughness of opaque porcelain. The data were statistically analyzed by one-way analysis of variance （alpha= 0.05） in SPSS 13.0. Results The reflectance value increased from 72.386±3.953 to 78.671±3.408, and CIE L＊ value from 90.189±1.200 to 93.496±1.070 with the increasing of surface roughness （Ra） of opaque porcelain from （0.226± 0.069） μm to （0.706±0.082） p,m. The same magnitude were also observed after body porcelain and enamel porcelain were sintered on with reflectance increased from 76.301±3.097 to 81.529±4.028, and CIE L＊ value from 80.694± 1.564 to 84.604±2.964. Conclusion The surface roughness of opaque porcelain had effects on the reflectance and value of PFM restorations. Within the limitation of this study, the recommended Ra range of opaque porcelain was 0.23-0.50 μm.