Objective To explore the relationship between cervical bone age and male juvenile mandibular second molar (Msm) root growth ,and to provide evidence for the development of bone and teeth in patients with orthodontic treatment . Methods The CBCT and lateral cephalometric radiographs of 114 cases of 9 .5 to 15 .5 years old children in Chongqing city and ad‐olescents cervical vertebral bone and MSM root length were measured ,using statistical analysis to explore the relationship between cervical vertebral bone ,tooth root length change of age and Msm .Results By Pearson correlation analysis ,Msm root length chan‐ges and cervical vertebral bone were positively correlated(r= 0 .737 ,P< 0 .01) .Msm root length changes showed a positive correla‐tion with age(r= 0 .681 ,P< 0 .01) .Msm root length changes was positively related with dental age(r = 0 .795 ,P< 0 .01) .Conclu‐sion The root growth of the mandibular second molar was highly correlated with cervical vertebral bone in male children .When the growth and development of patients were judged by orthodontic treatment ,we can adopt the mandibular second molar root length forecast growth level of male adolescents .%目的：探讨青少年男性颈椎骨龄与下颌第二磨牙（Msm）根生长之间的关系，为正畸治疗评价患者骨骼和牙齿发育情况提供依据。方法通过 CBCT 和头颅定位侧位片对重庆市114例9．5～15．5岁儿童和青少年的颈椎骨龄和 Msm 根长度进行测量，运用统计学分析方法探讨颈椎骨龄、牙龄和 Msm 根长度变化之间的关系。结果通过 Pearson 相关性分析，冠根比与颈椎龄呈正相关（r＝0．737，P＜0．01），冠根长／冠宽与年龄呈正相关（r ＝0．681，P＜0．01），冠根比与牙龄呈正相关（r ＝0．795，P＜0．01）。结论青少年男性下颌第二磨牙根生长与颈椎骨龄呈正相关。正畸治疗中判断患者的生长发育情况时，可参考采用测量下颌第二磨牙牙根生长长度预测男性青少年生长发育水平。
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