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目的 研究平面导板对成人颌面结构的影响.方法 选取25例固定矫治结合平面导板治疗的成人完成病例,24例单独采用固定矫治的成人完成病例.进行回顾性的头影测量分析,比较两组间治疗前后颌面结构变化的差异.结果 除咬合打开量外,两组间上下磨牙高度、下颌平面角、下面高等测量项目的变化量无显著性差异.结论 平面导板在辅助打开咬合的同时,对于成年患者的垂直向颌面结构无显著影响.“,”Objective To investigate the effect of bite plate on dentofacial structures in adult orthodontic patients.Methods 25 adult orthodontic patients treated with bite plate and fixed appliances were selected,and 24 adult patients treated with fixed appliances served as control group.Cephalometric analysis was performed before and after treatment.Independent-samples t-test was performed to compare the dentofacial structures between the two groups.Results The reduction of overbite was significantly greater in bite plate group.No significant difference was found in other measurements,including molar height,mandibular plane angles and lower facial heights.Conclusions No significant dentofacial changes were found in adult patients treated with bite plate,except reduction of overbite.