Objective To study the relationship between severity of skeletal Class Ⅲ malocclusion and the patient's emotional status, as well as motivation for seeking surgical correction and satisfaction with the outcome of the surgery. Methods One hundred and forty consecutive Chinese patients with skeletal Class Ⅲ malocclusion who had been treated with a combined orthodontic and surgical approach were studied. Sixty-seven percent (40 males and 54 females) responded to a questionnaire. Fifty-four percent had two jaw deformities, 32% mandibular hyperplasia and 14% maxillary hypoplasia. Surgical procedures: 77% received two jaw surgeries, 15% maxillary advancement and 8% mandibular setback. This was a retrospective study based on questionnaires with numerical scale ranked answers (0: not at all; 1: a little; 2: moderately; 3: quite a bit; and 4: extremely). Results ANB angle was significantly negatively correlated with feelings about the nickname related to their facial problems (embarrassment: r=-0.30, P<0.01; worn out r=-0.32, P<0.01; angry r=-0.24, P<0.05). ANB angle also had a significant negative correlation with the reasons for having the surgery (pressure from their friends: r=-0.21, P<0.05, and referred by physician: r=-0.24, P<0.05). Changes in life style as a result of surgery were significantly negatively correlated with the ANB angle before treatment, positive influence on relationships with the opposite sex (r=-0.25, P<0.05), positive influence in social activiies (r=-0.22, P<0.05).Conclusion The psychological status before surgery and the outcome following orthognathic surgery in patients with skeletal Class Ⅲ malocclusion were closely related to severity of the malocclusion.%目的本文的目的在于研究骨性Ⅲ类错畸形的严重程度与患者的精神心理及治疗要求和结果的关系。方法 采用的方法为分级问卷调查。研究对象为140名骨性Ⅲ类错畸形患者。其中67%的患者（40名男性，54名女性）完成并寄回问卷表。32%患者下颌前突，14%患者上颌后缩，54%的患者上颌后缩合并下颌前突。15%患者行上颌骨前移术，8%单纯下颌后退手术，77%患者进行上颌前移和下颌后退手术。 结果 ANB角与患者对面部畸形有关的外号的感觉负相关，与手术原因负相关。手术后生活方式的改变与手术前ANB角的大小显著相关。 结论 骨性Ⅲ类错治疗前后的社会心理改变与骨骼畸形的严重程度密切相关。
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