单颌与双颌正颌手术后面部软硬组织变化的对比研究

目的：对比分析骨性安氏Ⅲ类错[牙合]畸形正[牙合]手术后面部软硬组织的变化特点。方法：选择成人骨性Ⅲ类错[牙合]20例,对其手术前后头颅侧位片进行测量分析。结果：G-Sn-Pg＇,Cm-Sn-UL,S-N＇-Sn,UL-E的改变,两组有所不同。B＇与B,PoS与Po,GnS与Gn以及MeS与Me具有高度的相关性。软硬组织位移变化率双颌组均小于单颌组。结论：鼻唇关系差的骨性Ⅲ类错[牙合]最好做双颌手术。软硬组织位移比率：双颌手术中上颌小于下颌,且单颌手术高于双颌手术;软硬组织相关性：双颌手术中下颌比上颌强,且单颌比双颌强。

Comparative Study of soft and hard tissue changes after mandibular and bimaxillary orthognathic sugery

Objective To compare the changes of soft and hard tissues in patients with Skeletal Angle Class Ⅲ malocclusion following orthognathic surgery. Methods The cephalograms of Adult Skeletal Class Ⅲ malocclusion in 20 cases were measured and analyzed before and after operation. Results T G-Sn-Pg ＇,UL-E,Cm-Sn-UL,S-N＇-Sn are different in two groups.B ＇and B,PoS and Po,GnS and Gn,MeS and Me have dramatically correlations.The soft and hard tissue changes in the bimaxillary groups were smaller than mandibular group. Conclusion Bimaxillary surgery is better when the relationship of Skeletal Angle Class Ⅲ malocclusion. In the bimaxillary surgery,the displacement ratio of soft and hard tissue of upper jaw is smaller than the soft tissue of submaxilla and the ratio in maxillary surgery is bigger than bimaxillary surgery.In bimaxillary surgery,the mandibular have a stronger correlation with the corresponding than the upper jaw,and maxillary surgery have a dramatic correlation with the corresponding than bimaxillary surgery.