骨性安氏Ⅲ类错牙合患者不同垂直骨面型下颌联合高度差异的临床研究

摘要

Objective To compare the symphysis height among Class III malocclusion patients with different facial vertical skeletal patterns. Methods Incisor mandibular plane angle (IMPA) and symphysis height (LH) were measured in 115 lateral cephalometric x-rays of adult patients without prior orthodontic treatment. Results Incisor mandibular plane angle (IMPA) and symphysis height (LH)values showed significant differences between Class III malocclusion patients with different facial vertical skeletal patterns.Variations in the mandibular plane have a negative correlation with IMPA and a positive correlation with LH. Conclusion An increased trend of long-faced in Class III malocclusion led to variable-length of symphysis height and more lingual inclination of mandibular incisor.%目的：比较不同的垂直骨面型的骨性安氏Ⅲ类错牙合患者下颌联合高度的差异。方法：在未做过正畸治疗的115例患者的头颅侧位片上测量下中切牙-下颌平面角（incisor mandibular plane angle，IMPA）以及下颌联合高度（symphysis height，LH），比较不同垂直骨面型的骨性安氏Ⅲ患者的下颌牙槽代偿和下颌联合高度的差异。结果：下颌联合高度和下中切牙-下颌平面角在不同垂直骨面型的安氏Ⅲ类患者中存在明显差异。在骨性安氏Ⅲ错牙合中，下颌联合高度（LH）与下颌平面角呈正相关，下中切牙-下颌平面角（IMPA）与下颌平面角呈负相关。结论：骨性安氏Ⅲ类错牙合患者长面型的趋势导致下颌联合变长，下前牙代偿性舌倾随着长面型的趋势加重。