摘要
目的:研究不同牙科铸造合金或合金的不同处理形式对合金耐腐蚀性能的影响,为临床烤瓷合金的选择提供依据。方法:(1)采用铸造方法分别制作普通镍铬合金、镍铬合金镀金及金合金试样各8个,在人工唾液中测定各试样的极化曲线。(2)对临床采用上述3种合金烤瓷冠修复的735例病例,在修复1年后,分组对临床观察效果进行统计分析。结果:(1)镍铬合金试件和镀金试件,两次的阳极极化曲线皆有明显差异;贵金属试件,极化曲线的斜率和低腐蚀区宽度均无明显变化。(2)修复体戴用1年后,镍铬合金与镍铬合金镀金烤瓷的牙龈指数差异有显著性(P<0.05),而镀金与贵金属烤瓷修复体的牙龈指数差异无显著性(P<0.05);3组病例的菌斑指数在1年内差异均无显著性(P<0.05);镍铬合金烤瓷修复体牙龈退缩的比率明显高于其他2组(P<0.05),而镀金与贵金属烤瓷修复体牙龈退缩的比率无明显差别(P<0.05)。结论:应用极化曲线可以分析金属的表面状态,从而确定金属在何种情况下耐腐蚀性更好。就耐腐蚀性而言,贵金属合金最优,镀金次之,普通烤瓷合金最差。镀金试件镀层不全可造成合金更易受腐蚀,但随着时间的延长,其耐腐蚀能力增强。
Objective： To investigate the anti-corrosion of different dental casting alloys, so that we could in order to provide reference for clinical application. Methods： （1） Three kinds of Ddental alloys test pieces were made prepared, including Ni-Cr alloy, Ni-Cr alloy plated by gold and gold alloy, each for by casting, among them, 8 pieces were Ni-Cr alloys, 8 ones were gold alloys and 8 ones were gold-plating ones. Polarization curves of these pieces were recordedtested in artificial saliva. （2） 735 patients who accepted porcelain-fused-to-metal crown （PMF） or fixed bridges were selected. One year after placementlater, the clinical effect was observed and analysed through by statistical software. Results： （1） For the two tests, the polarization curves of Ni-Cr alloy and golding-plating plated pieces changed obviously, but the ones of gold alloys didn＇ t change very much. （2） One year later, the GI showed that there were significant difference between Ni-Cr alloys and gold-plating alloys, but no difference between gold-plating plated alloys and gold alloys, the PLI showed that there were no difference among three groups, and the gum shrinkage showed that the Ni-Cr alloy pieces were was higher in Ni-Cr alloy pieces than that in the other two groups, but there was no difference between gold-plating alloys and gold alloys had nodifference. Conclusions： （1） Polarization curve is an effective method for measuring the surface state properties of metal and alloys. It can make suredetermine which alloy is more fitter for clinical application. （2） The test result and clinical observation show that the anti-corrosion of gold alloys is the best and the one of Ni-Cr alloys is the worst. （3） For the gold-plating test pieces, defect of the plating may make the metal erode more easily. But this can be improved gradually with time going on.
出处
《口腔颌面修复学杂志》
2007年第1期11-14,共4页
Chinese Journal of Prosthodontics
关键词
牙科铸造合金
电化学腐蚀
极化曲线
烤瓷熔附金属修复体
dental casting alloys
electrochemical corrosion
polarization curve
porcelain-fused.to-metal （PFM）
