目的：研究下颌第二磨牙牙根的发育阶段和颈椎骨龄的关系。方法：来自500位患者的曲面断层和头颅定位侧位片，223名男性和277名女性，年龄在9～18岁之间，分别用 Demirjian index（DI）和改良颈椎分期法（CVMI）来评估患者的下颌第二磨牙和颈椎骨骼成熟情况。结果：DI 和 CVMI 具有高度相关性。其中 DI 的 E 阶段与 CVMI Ⅱ（生长发育高峰期前期）相关，DI 的 F 和 G 阶段与 CVMI Ⅲ、Ⅳ（生长发育高峰期）相关，DI 的 H 阶段与 CVMI Ⅴ、Ⅵ（成熟完成期）相关。结论：DI 和 CVMI 具有显著相关性，临床可以利用下颌第二恒磨牙的牙根发育情况判断机体的生长发育。%Objective:To investigate the relationship between mandibular second molar calcification stage and cervical vertebrae maturity.Methods:Samples were derived from panoramic radiographs and lateral cephalograms of 500 subjects (223 males and 277 females)aged 9 to 18 years.Demirjian Index(DI)and cervical vertebrae maturation indicators(CVMI)were used for the evaluation of dental and skeletal maturity.Results:A significantly association was found between DI and CVMI(P <0.001).DI stage E was associated with CVMI Ⅱ(pre-peak of pubertal growth spurt).DI stages F and G was associated with CVMI Ⅲ and Ⅳ(peak of pu-bertal growth spurt).DI stage H was associated with CVMI Ⅴ and Ⅵ(end of pubertal growth spurt).Conclusion:DI and CVMI are significantly associated.Mandibular second molar DI stage is a reliable indicator of skeletal maturity.
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