目的：探讨矫治力对大鼠牙髓组织中MEK的影响。
Objective: To study the effects of orthodontic force on MEK in rat pulpal tissue.
采用该模型，可以计算各种矫治力在颅面复合体产生的生物力学效果。
The model is used to investigate the biomechanical effects within the craniofacial skeleton by orthopedic forces.
欧米伽曲的存在延长了弓丝的长度，使得弓丝产生的矫治力更柔和，副作用更少。
The omega curve prolongs the length of the arch thread, which enables the arch thread to generate a softer orthodontic force and fewer side effects.
结果拔牙术后牙槽骨愈合良好，在矫治力的作用下，牙槽骨不断出现增生和吸收，并且高度降低。
Results There was a good recovery of alveolar bone after arrachement, and under the effect of corrective force , the hyperplasia and absorption continually occurred with height reduction.
结论不同张应力可引起MMP - 9含量发生明显的变化，对临床上选择最适矫治力可能起到重要的作用。
Conclusion different tension stress patterns take different effects on the secretion of MMP-9. It may play a very important role in choosing the best orthodontic force in clinic.
结论：使用直丝弓矫治技术时，应重视托槽表面粗糙、磨损对摩擦力的影响，注意支抗控制。
Conclusion: the attention would be played to the influence of the roughness and abrasion of the bracket slot area on friction and anchorage control in using sliding mechanics.
结论：使用直丝弓矫治技术时，应重视托槽表面粗糙、磨损对摩擦力的影响，注意支抗控制。
Conclusion: the attention would be played to the influence of the roughness and abrasion of the bracket slot area on friction and anchorage control in using sliding mechanics.
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