1·The saggital diameter of spinal canal, Povlov ratio and dynamic spinal stenosis parameter were measured on X-ray.
X线片测量椎管矢状径、Povlov比值、动态狭窄参数等指标；
2·The main skeletal factors influencing malocclusion include the saggital and vertical skeletal relationship and the gradient of chin;
影响错畸形型的骨骼因素主要包括上下颌矢状关系、垂直骨型、颏部倾斜度。