金属烤瓷修复体两种牙体预备形式的临床性能比较

Clinical Evaluation of Two Tooth Preparation Methods of Metal-porcelain Restoration

目的 比较金属烤瓷修复体牙体颈部预备为 90°肩台式和龈下无肩台式两种形式的临床性能。方法 将需做金属烤瓷冠修复的患者 ,根据牙体缺损情况分为 2组 ,牙体唇侧颈缘预备为 90°肩台式 4 0例 ,制作金属烤瓷冠5 5个 ;龈下无肩台式 4 0例 ,制作金属烤瓷冠 5 2个。在修复完成后 1年、2年进行随访 ,检查修复体菌斑指数、牙龈指数、颈缘变色及颈缘适合性。结果 2组结果比较表明 4项指标皆无统计学差异。结论 将牙体唇侧颈缘设计为龈下无肩台形式制作金属烤瓷修复体也能满足临床要求。

Objective To evaluate the clinical performance of the two configurations of gingival margin preparation of tooth.Methods The cases in this study were divided into two groups according to different tooth defects. Each group consisted of 40 cases. One group′s gingival margin configuration was 90°shoulder, the other was under-gingival non-shoulder. The clinical performance of these restorations was followed up for 1 year and 2 years. The evaluators examined the restorations for plaque index, gingival index, marginal discolor and marginal fit.Results There was no significant difference in the evaluators between the two groups.Conclusion The under-gingival non-shoulder margin configuration of porcelain fused to mental should be used for clinical application compared with the 90°shoulder one in certain circumstance.