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目的:研究空气喷砂对不同材料冠修复(镍铬烤瓷和钴铬合金)表面粗糙度的影响。方法:对12颗镍铬烤瓷和12颗钴铬合金进行冠修复。对于钴铬合金组,将抛光糊剂涂布在其表面,并用机械驱动抛光轮进行精加工。同时,收集正畸患者拔除的12对尖牙(4mm×4mm)作为对照组。对3组样本进行空气喷砂后,使用Rugosimeter评价样本的表面粗糙度。结果:空气喷砂前后3组样本的表面粗糙度之间存在显著性差异(P<0.05)。对照组及镍铬烤瓷组的表面粗糙度较喷砂前分别提高了1.31和1.88倍(P<0.05),而钴铬合金组在空气喷砂前后其表面粗糙度无明显变化(P>0.05)。结论:空气喷砂可增加牙釉质和镍铬烤瓷的表面粗糙度,而钴铬合金在空气喷砂前后表面粗糙度无明显变化,该材料可适用于空气喷砂处理。
Objective: To study the effect of air blast on the surface roughness of different materials crown repair (Ni-Cr porcelain and Co-Cr alloy). Methods: Twelve Ni-Cr porcelain and 12 cobalt-chromium alloys were crowned. For the cobalt-chromium alloy group, a polishing paste was applied to the surface thereof and finished with a mechanical driven polishing wheel. Meanwhile, 12 pairs of canines (4 mm × 4 mm) removed from orthodontic patients were collected as a control group. After air blasting three groups of samples, the surface roughness of the samples was evaluated using a Rugosimeter. Results: There was a significant difference in surface roughness between the three groups before and after air blasting (P <0.05). The surface roughness of the control group and the Ni-Cr porcelain group increased by 1.31 and 1.88 times respectively (P <0.05), while the surface roughness of the Co-Cr alloy group was not significantly changed before and after air blasting (P> 0.05 ). CONCLUSION: Air blasting can increase the surface roughness of enamel and Ni-Cr porcelain. However, the surface roughness of Co-Cr alloy does not change significantly before and after air blasting. This material is suitable for air blasting.