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目的:以颈椎骨龄定量分期法(QCVM)为划分标准,探讨QCVMI→Ⅳ期上下颌骨垂直向生长量、相对生长速率和生长完成百分比的变化特点。方法:对901名中小学生,每年定期拍摄正中位头颅侧位片及手腕骨片,连续6年,资料完整者87名(女55名,男32名),组成8～18岁正常青少年的混合纵向资料。按照颈椎骨龄定量分期法(QCVM),观察各期上下颌骨垂直向的变化。结果:①.上下颌骨垂直向各参数最大平均生长量均处于QCVM第Ⅱ期,最小生长量均处于QCVM第Ⅳ期;第二大生长量下颌处于第Ⅲ期,上颌处于第Ⅰ期;②.相对生长速率的快慢与生长量的大小并非完全一致。上颌前后部高度最大相对速率均处于QCVM第Ⅰ期,而下颌高度最大相对生长速率发生在第Ⅱ期,第Ⅰ期次之;③.下颌骨高度在QCVM第Ⅱ期结束时仍有约30%的生长潜力,而上颌骨前后高度在QCVM第Ⅱ期完成生长约85%,男女性别没有显著差异。结论:颈椎骨龄定量分期法能评估上下颌骨高度在不同的骨龄发育阶段的生长量、相对生长速率、生长完成百分比,对正畸临床有一定的参考价值。
OBJECTIVE: To evaluate the change of vertical growth rate, relative growth rate and percentage of growth completion of upper and lower jaw in QCVMI → Ⅳ by quantitative cervical staging age (QCVM). Methods: A total of 901 primary and secondary pupils were enrolled in this study. The median cephalometric and periarticular films were taken on a regular basis every year for 87 consecutive years (female 55, male 32) for 8 years Mixed vertical information. According to the cervical vertebra bone age quantitative staging method (QCVM), observe the vertical changes of the mandible. Results: ①The maximal mean vertical growth of maxillary and mandibular were all in the second phase of QCVM, the minimum growth was in the fourth phase of QCVM; the second largest growth was in phase Ⅲ, the maxillary was in stageⅠ; ② The relative growth rate is not exactly the same as the growth rate. The maximal relative height of maxillary anterior and posterior segments were all in the first phase of QCVM, while the maximal relative growth rate of mandibular height occurred in the second and the first phase. ③The mandibular height was still about 30% Of the growth potential, while the height of the maxilla before the completion of the second phase of QCVM about 85% growth, gender was no significant difference. Conclusion: Quantitative staging method of cervical spine age can evaluate the growth, relative growth rate and percentage of growth of upper and lower jaw bone in different stages of bone age development, which may be of reference value to orthodontic clinic.