AIM: To present the incidence, causes and influence factors on gingival invaganation after or-rnthodontic space closure of tooth extraction sites. METHODS: One hundred and fifty-two Edgewise fixed appliance cases with premolars removed were retrospectively analyzed. Clinical analysis criteria were gender, age, treatment period and the width of extraction site. The results were statistically analyzed by Logistic regression. RESULTS: The incidence of gingival invaganation was 23. 7% . Logistic regression analysis revealed that gender, age and the time needed for closure of the extraction spaces had no influence on the incidence of gingival invagination. The width of extraction spaces was negatively correlated to the incidence of gingival invagination and the gingival invagination was more severe in the mandibular arch than in the maxillary arch (P <0. 05) . CONCLUSION: After orthodontic closure of extraction sites, the width of extraction sites influenced the incidence of gingival invagination, and the gingival invagination was more likely to happen on the lower jaw than on the upper jaw.%目的:探讨减数矫治病例拔牙间隙关闭后牙龈折痕现象的发生率、形成原因和影响因素.方法:选择152例拔除前磨牙行直丝弓固定矫治的病例,分别依性别、年龄、上下颌、关闭间隙距离以及矫治时间等进行比较,将检查结果进行统计学分析.结果:152例患者牙龈折痕发生率为23.7％.经Logistic回归分析,性别、年龄和关闭间隙的时间对牙龈折痕的出现无统计学意义(P＞0.05),关闭间隙的距离与牙龈折痕的出现呈负相关(P＜0.05).下颌较上颌更易出现牙龈折痕(P＜0.05).结论:减数矫治病例拔牙间隙的距离大小影响牙龈折痕的出现,并且下颌较上颌更易出现牙龈折痕.
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