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目的研究成人慢性牙周炎患者正畸矫治后切牙区黑三角形成的原因和临床意义。方法选取54例固定矫治后出现切牙区牙龈萎缩形成黑三角(b1ack triangle,BT)的成人牙周炎患者和50例矫治后未出现黑三角的成人慢性牙周病患者对比研究牙龈乳头变化,以探讨黑三角的形成原因。结果治疗后切牙的切缘接触点至牙槽嵴顶距离越大,形成黑三角可能性越大;牙冠为尖圆形的患者正畸治疗后有13.21出现黑三角;牙龈为薄型牙龈生物型的患者23.25出现黑三角,均无相关性。结论正畸后切牙区黑三角的形成是多因素引发的疾病。
Objective To study the causes and clinical significance of the formation of the black triangles in adult patients with chronic periodontitis after orthodontic treatment. Methods 54 cases of adult periodontitis patients with gingival recession forming b1ack triangle (BT) and 50 cases of chronic periodontal disease without correction of black triangle after orthodontic treatment were included in this study. The changes of gingival papilla were compared between the two groups. To explore the formation of the black triangle. Results After the treatment, the distance between the contact point of the incisors and the crest of the alveolar ridge was more likely to be formed in the black triangle. In the patients with sharp crowns, 13.21 appeared in the black triangle after orthodontic treatment. The gingiva was thin gingival Type 23.25 black triangle appeared, there is no correlation. Conclusion The formation of the black triangle in the orthodontic area is a multifactorial disease.