临床烤瓷工艺对烤瓷合金组织及耐腐蚀性的影响  

Effect of porcelain firing cycle on microstructure and corrosion resistance of 4 metal ceramic alloys

作　　者：陈蕾[1] 蔡惠[1] 徐国富[2] 方厂云[1] 

机构地区：[1]中南大学湘雅医院口腔科,长沙410008 [2]中南大学材料科学与工程学院,长沙410083

出　　处：《中南大学学报（医学版）》2006年第3期408-410,413,共4页Journal of Central South University ：Medical Science

摘　　要：目的:探讨临床烤瓷加工工艺对4种烤瓷合金(3种非贵金属,1种高贵金属合金)表面微观组织以及耐腐蚀性的影响。方法:模拟临床烤瓷修复体的制作,借助场发射扫描电镜(EFSEM)观察合金表面形貌,能谱仪(EDS)分析表面元素的组成;应用电化学综合测试系统和corrview2腐蚀分析软件对受试合金行动电位极化扫描,绘制合金在人工唾液中的极化曲线,获得并分析材料的自腐蚀电位(Ecorr)和临界破裂电位(Etp)。结果:临床烤瓷加工后,表面元素组成存在波动,非贵金属合金表面形貌发生变化;合金自腐蚀电位负值增大,差异具统计学意义,破裂电位值减小。结论:临床烤瓷加工工艺能够改变合金的表面微观组织,增加合金的腐蚀倾向。Objective To determine the effect of porcelain firing cycle on microstructure of 4 metal ceramic alloys, and to analyze the changes of their corrosion resistance in the artificial saliva. Methods We simulated the process of firing and repolishing when fabricating porcelain-fused-to-metal restoration in clinic, and then observed the microstructures of Ni-Cr, Ni-Cr-Ti , Co-Cr alloys and high gold alloy by field emission scanning electron microscopy and energy dispersive spectroscopy. The electrochemical corrosion behavior of alloys in artificial saliva was analyzed by polarization curves and corrview 2 corrosion analysis software. The data of self-corrosion potential and transpassive poten- tial were obtained and analyzed. Results After the porcelain firing cycle, the surface composition changed slightly, and the morphological in the 3 predominate base metal alloys also changed. The self-corrosion potential turned to more negative, and the transpassive potential declined. Conclusion The procedure of porcelain firing cycle can affect the surface microstructure and increase the corrosion of 4 metal-ceramic alloys.

关 键 词：烤瓷合金 腐蚀 电化学 

分 类 号：R783.1[医药卫生—口腔医学]