When related to the anterior cranial base plane and the Frankfort plane, the lower incisors became more uprighted. The dege of the lower incisor keep a stable relationship with A Pg as reference line. 在水平向,相对于下颌本身下切牙切缘和牙轴均无明显变化,相对于前颅底平面和FH平面变得更加直立,而与APg连线保持稳定的关系。