For an orthodontic case with the discrepancy of the discoordination between the length of palate bone and tooth size or for a case with skeletal discrepancy of the unsymmetry upper and lower jaw in their size and position , the most common treatment is to extract the upper ahd lower first or the second premolar 摘要一般矫正治疗，对于齿槽骨和牙齿大小长度总和的不调和或上下颚骨骨骼性大小、位置不对称，其处置原则通常都以上下颚第一小臼齿或第二小臼齿等4齿做为拔除对象来进行矫正治疗。
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