下牙弓变化中，第二双尖牙间和磨牙间宽度增加有显著性差异。
In addition, the changes of width between second bicuspid and mandibular molars showed statistical significances.
结果：上颌矫治后尖牙间牙弓宽度和基骨宽度明显增加（P< 0 .0 1） ，前磨牙间牙弓宽度和基骨宽度明显减小（P< 0 .0 1）。
Results: After treatment, in maxilla the arch width and alveolar bone width between canines were in creased(P<0.01), those were decreased between second premolars(P<0.01 ).
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