...牙弓宽度；基骨弓宽度；平面导板 [gap=2580]Key words:self-ligating brackets; conventional bracket;cephalometric;dental arch width;basal Bone arch width;occlusal guide ..
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Not all of dental arch width and length will relapse after retention.
经治疗和保持后，上下牙弓宽度和长度并非一定会复发。
Objective: To investigate the effects of tooth extraction on dental arch width and alveolar bone width.
目的：研究拔牙矫治对牙弓宽度和基骨宽度的影响。
CONCLUSION: the dis-coordination of the dental arch width in maxilla and mandible has an affinity with periodontal disease.
结论：上、下牙弓宽度不调与牙周病有密切关系。
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