目的：利用CBCT初步探索冠状向后牙�平面偏斜患者的牙颌特征及代偿机制，为临床中诊治�平面偏斜提供更加精准的指导。方法：本研究筛选面部对称人群64例，测量其后牙�平面偏斜角，以确定面部对称人群上颌后牙�平面偏斜角的95%医学参考值范围。根据此医学参考值范围筛选得到后牙�平面偏斜患者29例纳入实验组，个别正常颌人群21例纳入对照组，通过Mimics20.0软件将研究对象CBCT三维重建，比较两组的上颌、下颌相关指标，探索后牙�平面偏斜患者的牙颌特征。结果：面部对称人群上颌后牙�平面偏斜角的95%医学参考值范围为（1.19，1.51）°。实验组下颌升支高度两侧之差的绝对值（|Diff R-H|）大于对照组（P<0.05），且全部样本的Diff R-H均为正值，对照组|Diff R-H|的95%医学参考值范围为（1.17，2.01）mm，上颌基骨倾斜角在两组中差异虽存在统计学意义（P=0.048），但是两组差异小于0.5°，其余指标均无统计学差异（P>0.05）。结论：后牙�平面偏斜患者�平面较低侧下颌升支较对侧长，骨性不对称主要发生在下颌。

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