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对ＡｎｇｌｅＩＩ类１分类与２分类错及正常儿童各１２名，在姿势位时用新型电阻应变计式压力传感器测量系统，对其上下唇和舌肌对上下中切牙与磨牙所施压力进行了测量与比较。结果表明：①ＡｎｇｌｅＩＩ类错者与正常相比，唇肌压力变化明显，舌肌压力改变不如唇肌显著。②上唇肌压力是由ＡｎｇｌｅＩＩ类错上切牙的位置所决定，其１分类上唇肌压力较大，２分类唇肌压力则较小。上唇对上切牙唇向或舌向倾斜，具有一定的适应性。③ＡｎｇｌｅＩＩ类错者下唇肌压力较正常增加了３～４倍。作者认为，下唇肌压力增高是ＡｎｇｌｅＩＩ类错下颌后退的主要原因；口周力与错畸形之间可能存在互为因果的关系，有待深入研究。
AngleII class 1 classification and classification 2 and normal 12 children each, when position position with a new resistance strain gauge pressure sensor measuring system, the upper and lower lip and tongue muscle on the vertical incisors and molar pressure applied Measurement and comparison. The results showed that: ①AngleII wrong class compared with normal, significant changes in lip muscle pressure, tongue muscle pressure change is not as significant as lip muscle. Upper lip muscle pressure is determined by the position of the Angle II class of incisors. The classification of the upper lip in the classification 1 is larger and the pressure of the lip in the 2nd classification is smaller. Upper lip on the incisor lip or tongue tilt, with a certain adaptability. ③ Angll class II wrong lower lip muscle pressure than normal increased by 3 to 4 times. The authors believe that the lower lip muscle pressure is the main reason AngleII class jaw recession; oral and orthodontic forces may exist mutual causal relationship needs further study.