SNB degree, mandibular ramas height, mandibular length, mandibular body length and the distance from Pg to OLP plane were increased 3. 12, 3. 57mm, 6. 66mm, 4. 87mm and 3. 5mm respectively.

• 领骨的旋转变化:愕平面与下领平面所成角、愕平面与SN平面所成角、SN平面与下领平面所成角及SN平面与胎平面所成角，在治疗前后均无显著差异，与对照组相比亦无差异，说明上下领骨治疗前后不发生旋转。