骨性Ⅲ类错He正畸—外科联合治疗后牙齿长期稳定性研究

目的探讨口腔正畸-正颌外科联合治疗前后不同阶段牙齿的变化和术后的稳定性.方法选取31例在北京大学口腔医学院进行口腔正畸-正颌外科联合治疗的骨性安氏Ⅲ类错(牙合)患者,对其不同阶段X线头影测量片进行研究.结果牙齿在术前正畸阶段有明显的去代偿,下切牙平均唇倾7.08°.在术中,上切牙随颌骨的旋转有直立,下切牙有后移.术后,上切牙有唇向复发,下切牙相对于基骨稳定.术后牙齿保持良好的咬合,而且主要变化发生在术后正畸阶段.结论Ⅲ类错(牙合)患者在术前正畸阶段牙齿明显去代偿,术后上前牙稍有复发,下前牙相对保持稳定.

The long-term stability of dentition in skeletal class

OBJECTIVE: To Investigate the changes in dentition at each treatment stage and to get some guidelines for clinical work. METHODS: Thirty-one cephalometric films of skeletal class III malocclusion patients were analyzed. All the patients were treated by orthodontic and orthognathic surgery. RESULTS: During presurgical orthodontic treatment, the lower Incisors were decompensated (labially Proclined by 7 degrees ). The upper incisors were uprighted during surgery following rotation of maxilla. After surgery, the upper anterior teeth kept tipping for ward. While the lower anterior teeth were In stable. The dentition was in good occlusion during observing stage. CONCLUSIONS: Lingually tipped lower Incisors were decompensated after presurgical orthodontic treatment in class III malocclusion patients, and lower Incisors kept in stable during observing stage, while the upper incisor had a little bit relapse.