Cephalometric analysis was taken on lateral cephalograms including FH-PP, MP-AB, ODI.The data were analysed with SAS6.12 software package for grouped t test.

• 头颅侧位定位片测量指标为腭平面角、下颌-AB平面角、ODI值，采用SAS6.；12软件包对数据进行团体t检验。