Result The increase of width of dental arch and basal bone has statistically significant difference.
结果治疗后牙弓、基骨的宽度比治疗前增加，统计学分析有显著性差异。
Conclusion (1) Insufficient basal bone width and excessive tooth size were the main causes of tooth crowding and tooth removing treatment.
结论：1 .基骨宽度不足、牙齿过大是造成牙列拥挤和拔牙矫治的主要原因。
Objective To analyze the curative effect of different type of first metacarpal bone basal body fracture exerting diversity approaches.
目的分析用不同方法治疗不同类型的第一掌骨基底骨折所获得的疗效。
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