The main changes of periodontium were gingival discoloration, marginal gingivitis and periodontitis The incidence of periodontal disease was higher in non retraction group than in retraction g...

• 金属烤瓷修复后牙周组织的主要变化为:颈缘变色、慢性单纯性牙龈炎和牙周炎。排龈组与不排龈组的牙周疾病发生率有显著性差异,排龈组明显少于未排龈组。