目的：比较安氏Ⅲ类骨性Ⅲ类与安氏I类错牙合畸形舌体形态位置及舌骨位置。方法对46例患者（实验组安氏Ⅲ类骨性Ⅲ类26例，对照组安氏I类20例）拍摄头侧位X光片并在舌背涂抹硫酸钡糊剂，选择舌体及舌骨的17个点进行描记，对13个测量值进行分析。结果（1）安氏Ⅲ类骨性Ⅲ类错牙合畸形患者比安氏I类错牙合畸形患者舌尖位置偏前（O-T1）、舌根位置偏后（O-T7）、舌体中断偏低（O-T2，T3）有统计学意义（P＜0.05）；（2）安氏Ⅲ类骨性Ⅲ类错牙合畸形患者比安氏I类错牙合畸形患者舌长更长（ET）有显著统计学意义（P＜0.01）；（3）安氏Ⅲ类骨性Ⅲ类错牙合畸形患者比安氏I类错牙合畸形患者舌骨位置偏前下方（P＜0.05，P＜0.01）有统计学意义。结论安氏Ⅲ类骨性Ⅲ类与安氏I类错牙合畸形舌体形态位置及舌骨位置相比舌体形态位置及舌骨位置均有不同，安氏Ⅲ类骨性Ⅲ类错牙合畸形较安氏I类错牙合畸形舌长偏长，舌骨位置偏前下方。%Objective To compare the tongue shape and hyoid bone position in Angle class III and skeletal class III malocclusion with those in Angle class I malocclusion. Methods 46 cases were enrolled, including 26 cases of Angle class III and skeletal III maloc-clusion and 20 cases of Angle class I malocclusion;the dorsum of tongues were coated with barium sulfate and lateral X-ray of the head was taken;17 spots on the tongue and hyoid bone were selected and traced, and 13 measured values were analyzed. Results The tongue tips of the patients of Angle class III and skeletal class III malocclusion were positioned more anterior(O-T1), the hyoid more posterior (O-T7)and the tongue middle more inferior(O-T2,T3)compared with the patients of Angle class I malocclusion, the difference was of statistical significance (P<0.05); The tongues of patients of Angle class III and skeletal class III malocclusion were longer than those of patients of Angle class I malocclusion, the difference was of obvious statistical significance (P<0.01);The hyoid bone of patients of An-gle class III and skeletal class III malocclusion was positioned more anterior inferiorly than that of patients of Angle class I malocclu-sion, the difference was of obvious statistical significance (P<0.01, P<0.01). Conclusions The tongue shape and hyoid bone position of patients of Angle class III and skeletal class III malocclusion are of certain difference from those of patients of Angle class I malocclu-sion.
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