目的：探讨二次嵴上纤维环切术对牙周病患牙牙周附着的影响。方法：选取4例共22颗前牙患有中度牙周炎的成人患者，一侧患牙施行1次嵴上纤维环切（T1组），另一侧行2次环切（T2组）。排齐整平阶段前后分别拍摄患牙的平行投照 X 线片，测量釉牙骨质界至牙槽嵴顶的距离（CEJ-AC），冠根比和牙根长度。并检测患牙的相关牙周指数。采用配对 t 检验进行统计学分析。结果：T2组 CEJ-AC 和冠根比下降大于 T1组（P ＜0．01），牙周指数的变化与 T1组相比无统计学差异（P ＞0．05）。结论：二次牙龈环切能增加患牙的牙周附着及牙槽骨相对高度，合理的正畸压入不会造成牙周炎患牙牙根吸收。%Objective:To explore the effects of double circumferential fibrotomy(CF)in the improvement of periodontal attachment of the teeth with periodontal disease.Methods:22 migrated incisors of 4 adults were randomly assigned to one-time CF group (T1 )and double CF group(T2)by center line.Periapical intraoral radiographic examination was performed using paralleling technique at pre-and post-leveling-alignment stage of the teeth.Root length,crown-root ratio and the distance of CEJ-AC were measured.The periodontal in-dicators were also recorded during the orthodontic treatment.Data were statistically analysed by comparative t-test.Results:CEJ-AC and crown root ratio reduction was greater in T2 group than those in T1 group(P <0.01 ),but the periodontal indices did not show sig-nificant difference between the 2 groups(P >0.05).Conclusion:Double circumferential fibrotomy can improve periodontal attachment, reasonable orthodontic force does not lead to remarkable root resorption of the periodontitis inflicted teeth.
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