前牙金瓷冠修复的美学探讨

Esthetic evaluation in restoring anterior teeth with porcelain fused to metal crown

目的比较4种金属烤瓷冠(porcelain fusedto metalcrown,PFM)修复前牙的美学效果。方法根据统一标准,对110例371颗前牙,修复成59例206颗镍铬合金PFM,29例105颗肩台瓷PFM,16例35颗纯钛PFM,6例25颗贵金属PFM,修复后1周内和1年后用单盲法进行美学效果检查,分析评价检查结果。结果修复后3d到1周:4种修复体外形和色泽无差别,与邻牙相协调,边缘适合性好,4组间差异无显著性。贵金属PFM和肩台瓷PFM没有牙龈颜色的改变,镍铬合金PFM和钛金属PFM有3.5%的游离龈色略变暗。修复后1年后4种修复体外形和色泽无差别,与邻牙相协调;贵金属PFM的边缘适合性优于其余3种修复体,差异有显著意义。结论贵金属PFM修复前牙美学效果最佳,肩台瓷PFM也较好。

Objective To compare and analyse the esthetic effect of four kinds of the porcelain fused to metal crowns （PFMs） in restoring anterior teeth. Methods Based on single standard, a total of 371 anterior teeth from 110 patients were restored by PFM, in which 206 teeth of 59 patients were restored with Ni-Cr alloy PFM, 105 teeth of 29 patients with full circular procelain shoulder PFM, 35 teeth of 16 patients with titanium metal PFM, and 25 teeth of 6 patients with noble metal PFM. The esthetic effect was examined and analysed by single-blind method in one week and after one year. Results Between three days and one week, there was no difference among four PFMs in shapes and colors, which corresponded with adjacent teeth. The edge suitability was good and no significance was found in them. After one year, there was no difference of four PFMs in shapes and colors, which corresponded with adjacent teeth. The edge suitability of noble metal PFM was better than the other three, and the difference was statistically significant. Conclusion The esthetic effect is the best when noble metal PFM is used to restore anterior teeth and better with full circular procelain shoulder PFM.