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目的观察烤瓷熔附金属全冠不同边缘位置对牙周组织的影响。方法选择行镍铬合金烤瓷全冠修复后3个月的临床病例20例,按冠边缘位置分为冠边缘平齐龈缘组(A组)10例,冠边缘位于龈下0.5～1 mm组(B组)10例,以A组和B组对侧或对颌健康同名牙做对照组。记录试验组和对照组牙龈指数(GI)、探诊深度(PD),并采用滤纸条法收集龈沟液,测定龈沟液量。结果 A组在临床牙周指标(GI、PD)与其对照组无统计学差异(P>0.05),而GCF量变化上有统计学差异(P<0.05)。B组各项指标与其对照组比较均有统计学差异(P<0.05)。A组与B组之间比较各指标也均有统计学差异(P<0.05)。结论不同牙冠边缘位置对牙周组织的影响不同。与对照组健康牙比较,冠边缘平龈边缘对牙周组织健康影响较小,龈下边缘较平龈边缘对牙周组织的影响大。
Objective To observe the effect of different edge locations of PFM crown on periodontal tissue. Methods Twenty patients were enrolled in this study. Twenty patients were enrolled in this study. Ten cases were divided into two groups according to the edge of the crown: group A (group A), group A (crown margin) 0.5-1 mm Group B (group B) 10 cases, with A and B contralateral or right jaw to do the same name as the control group. The gingival index (GI) and probing depth (PD) of the experimental group and the control group were recorded. The gingival crevicular fluid was collected by the filter paper method and the amount of gingival crevicular fluid was measured. Results There was no significant difference in clinical periodontal index (GI, PD) between group A and the control group (P> 0.05), while there was a significant difference in the amount of GCF (P <0.05). The indexes in group B were significantly different from those in control group (P <0.05). There was also a significant difference in the indexes between group A and group B (P <0.05). Conclusion Different crowns have different effects on periodontal tissues. Compared with healthy teeth in control group, the marginal gingival margins of the crown edge had little effect on the periodontal tissue health, and the effect of the subgingival edge on the periodontal tissue was greater than that of the gingival margin.