Status of first molar space closure, tooth alignment, occlusal relationship, soft tissue lateral profile after treatment were evaluated.
对治疗后第一磨牙间隙关闭情况、牙关系和侧貌进行评价；
2
Therefore the influence of the longitudinal and lateral rigidity of the cone and tooth pressing in the adjacent holes must be taken into account in the design and machining of the cone.
齿孔计算模型以及牙轮设计和加工过程中，必须考虑牙轮纵横向刚度以及邻孔压齿的影响。
3
Objective To investigate methods of treating anterior maxillary teeth protrusion by tooth extraction, and changes of the occluding relation and lateral appearances before and after the treatment.