The lower anterior teeth moved lingually and protracted. Occlusal plane is flattened.
下前牙在舌向移动与倾斜同时略有升高，平面变平。
2
Occlusion plane was defined as conference plane, the buccal or lingual inclination of posterior teeth in upper and lower arch was measured.
同时以平面作为参考平面，测量上下颌后牙颊舌向倾斜程度。
3
It analyzes the influence of the grinding wheel wear on geometric size and teeth contact of worm gear, kinematics precision of the quasi-plane double enveloped hourglass one.