The labial crown inclination of upper incisors was larger, but the lingual crown inclination of upper and lower canines was smaller. 牙冠转矩:上颌中、侧切牙的唇向倾斜度较美国人大,而上、下尖牙的舌向倾斜度较小。
The lingual inclination of lower posterior teeth was significantly smaller in MBT appliance group ( P < 0. 01). 滑动直丝技术及MBT托槽在关闭拔牙间隙时,对下后牙舌倾度有较好的控制能力,两组差异呈高度显著性(P<0.01)。