The forward and upward rotation of palatal plane may lead to open-bite.
腭平面在下降的同时伴前上旋转趋势，容易引起开。
The sagittal inclinations to the palatal plane of the first and second maxillary molars were measured on panoramic tomography.
在曲面断层片上分别测量上颌第一和第二磨牙与腭平面所成的角度。
Results: Cephalometric analysis revealed that the premaxilla was moved forward and downward and the length of palatal plane increased.
头影测量分析显示上颌前部得到有效向前、向下移动；腭平面延长。
Results: Cephalometric analysis revealed that the premaxilla was moved forward and downward and the length of palatal plane increased.
头影测量分析显示上颌前部得到有效向前、向下移动；腭平面延长。
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