常用金属烤瓷全冠修复前牙缺损的远期疗效分析

Long-term efficacy of front teeth repair with three different frequently used porcelain-fused-to-metal crowns

目的 通过 3种不同设计处理的金属烤瓷全冠修复前牙缺损的远期疗效对比分析 ,选择最佳的修复方法。方法 对金属烤瓷全冠用 3种不同设计方法对前牙缺损进行修复。分组 :第 1组 ,非贵金属合金 (镍铬合金 )的金属烤瓷全冠即普通金属烤瓷全冠 (Porcelainfusedtometal,PFM)全冠 ;第 2组 ,全瓷颈缘技术的金属烤瓷全冠 ;第 3组 ,贵金属合金的金属烤瓷全冠 ,并随访观察 1～ 2a。结果 第 1组修复的大部分基牙龈缘、冠边缘发暗或变灰黑 ,金属烤瓷冠部分有瓷返青现象 ;第 2组修复的基牙无龈缘发暗、冠边缘变灰黑现象出现 ,只是金属烤瓷冠一小部分有瓷返青现象 ;第 3组修复的金属烤瓷冠冠体颜色、基牙龈缘、冠边缘都没变化。结论 金属烤瓷全冠修复前牙缺损时采用全瓷颈缘技术 (特殊要求时用贵金属合金的金属烤瓷全冠 )能有效地解决基牙龈缘、冠边缘发暗或变灰黑现象。

Objective To evaluate the long-term efficacy of front teeth repair with three differently designed porcelain-fused-to-metal (PFM)crowns,thereby choosing the best method of repair.Method The PFM crowns were designed in three ways to deal with front teeth defect:group one,non-precious metal alloy: PFM made of Ni-Cr alloy;group two,PFM with porcelain covering the whole neck margin;group three,PFM made of precious metal alloy (above 70% of gold).We made continuous observations for one to two years.Results In the first way of repair, the gingival margin of most teeth and crown edge become dark or even greyish black. The porcelain on the PFM partly turns blue. In the second way, there is no change in gingival margin and crown edge, and only a small section of porcelain of the PFM turns blue. In the third way,there is no change in the PFM color,gingival margin and crown edge.Conclusion It is a good way to solve the problem that gingival margin and crown edge become dark and even greyish black by covering the whole neck with porcelain (especially the PFM made of precious metal alloy) when we use PFM to repair front teeth defect.