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目的:探讨恒牙列早期安氏类1分类错患者矫治前拔牙与否的形态学影响因素。方法:对临床获得满意疗效的81例恒牙列早期安氏类1分类错患者,其中39例未拔牙,42例拔除4个双尖牙,采用华西医科大学X线头影测量综合分析法和牙颌模型分析法进行回顾性比较研究。结果:拔牙组表现为下颌平面角(FMA)、下切牙交角(FMIA)较大,下面高较大,上切牙更前倾,牙列拥挤量和下颌矢状曲线曲度较大,与未拔牙组比较差异有显著性;而上下颌骨的矢状不调程度及颜面软组织外形,拔牙组和未拔牙组无显著性差异。结论:Tweed三角的稳定协调程度、牙列拥挤度、矢状曲线曲度是决定拔牙与否的重要因素
OBJECTIVE: To investigate the morphological influencing factors of tooth extraction before correction in patients with Class 1 malocclusion of permanent dentition. Methods: Eighty-one patients with early-stage Class 1 malocclusion of permanent dentition with satisfactory curative effect were enrolled. Among them, 39 cases had no tooth extraction and 42 cases had 4 cases of bipinodal removal. According to X-ray cephalometric analysis method of Huaxi Medical University and Retrospective comparative study of dental model analysis. Results: The extraction group showed the mandibular plane angle (FMA), the larger FMIA, the larger underneath, the more superior incisors, the more crowding of the dentition and the greater sagittal curve of sagittal arch, There was significant difference between the non-extraction group and the maxillary and maxillary mandibular sagittal soft tissue appearance, extraction group and non-extraction group no significant difference. Conclusion: The stable coordination degree of the Tweed triangle, crowding degree of the dentition, curvature of the sagittal curve are the important factors that determine the tooth extraction