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目的：探讨早期牙矫治对恒牙列萌出及咬合稳定的关系。
Objective: To investigate the relationship of early treatment and the permanent dentition occlusal.
目的通过测量60付自然恒牙列模型，获取自然前牙牙体聚合度的正常值，补充国人牙体测量方面的数据并为临床应用提供参考。
Objective To measure the convergence angles of natural anterior teeth so that to attain the reference, and provide basis for clinical use.
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