结论：上、下牙弓宽度不调与牙周病有密切关系。
CONCLUSION: the dis-coordination of the dental arch width in maxilla and mandible has an affinity with periodontal disease.
经治疗和保持后，上下牙弓宽度和长度并非一定会复发。
Not all of dental arch width and length will relapse after retention.
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.
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