However, there have been few studies in this area after the 1960s. Therefore, in this study, we examined the permanent teeth eruption time and sequence of 6,755 adolescents living in Xian.
60年代后,恒牙萌出时间和顺序的系统性研究很少。
参考来源 - 恒牙萌出时间和顺序的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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