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目的:探讨金属烤瓷冠颈缘的不同位置对基牙牙周组织的影响。方法:收集金属烤瓷单冠修复的后牙(包括磨牙和前磨牙)患者50例,69个牙齿,按全冠颈缘位置分为龈上组34例和龈下组35例,修复后1年检查各基牙的牙龈指数,并对发生牙龈炎症的基牙的可能因素进行统计分析。结果:龈下组基牙的牙龈指数高于龈上组(P<0.05),龈下组中发生龈炎有20个牙(发病率57%),是龈上组的10倍(2个牙)。结论:后牙烤瓷全冠修复颈缘位于龈上更有利于基牙的牙周健康。
Objective: To investigate the influence of different positions of metal-ceramic crown on the periodontal tissues of abutments. Methods: Fifty patients (69 teeth) with posterior teeth (including molars and premolar) repaired with metal single crown were divided into 34 cases of supragingival group and 35 cases of subgingival group according to the location of the cervical margin. The gingival index of each abutment was examined and statistical analysis of the probable causes of abutment with gingival inflammation was performed. Results: The gingival index of the subgingival abutment was higher than that of the supragingival group (P <0.05). Gingivitis occurred in the subgingival group with 20 teeth (incidence 57%) and 10 times that of the supragingival group (2 teeth ). Conclusion: The restoration of the cervical rim of the posterior teeth with porcelain crowns is more beneficial to the periodontal health of the abutments.