Private Practice, Nocciano (PE), Italy.
Department of Medical, Surgical and Health Sciences, School of Dentistry, University of Trieste, Trieste, Italy.
Am J Orthod Dentofacial Orthop. 2020 Mar;157(3):305-312. doi: 10.1016/j.ajodo.2019.03.026.
The cervical vertebral maturation (CVM) method comprises 6 stages reported to be prepubertal (1 and 2), pubertal (3 and 4) and postpubertal (5 and 6), and its use has been recommended for planning treatment timing in orthodontics. Reliable use of the method implies that pubertal stages have to mature into postpubertal as soon as the growth peak is terminated. The present study was aimed at determining whether postpubertal CVM stages 5 or 6 are attained in all subjects.
A total of 450 adult subjects (270 females and 180 males; mean age, 30.4 ± 27.3 years; range, 20-45 years) seeking orthodontic treatment and having a lateral head film were included in the study. Customized cephalometric analysis was used, and each recording was converted into an individual CVM code according to the concavities of the C2 to C4 and shapes of C3 and C4. The retrieved CVM codes, either falling within the reported norms (regular cases) or not (exception cases), were also converted into the CVM stages and a newly introduced CVM score (0-9) capable of defining intermediate stage.
The most frequent CVM stage was 5, while the CVM stage 6 was attained in only one third of the sample. Up to about 11% of adult subjects showed the pubertal CVM stage 4. Irrespective of the CVM stage or CVM score, no significant differences were seen between the sexes or across ages. The C4 showed a rectangular vertical shape in only 16.4% of the cases.
The percentage of adult population maintaining a pubertal CVM stage 4 is not high, but still relevant from a clinical standpoint. In light of this finding, planning treatment timing-based only on CVM appears not fully reliable.
颈椎成熟度（CVM）方法包括 6 个阶段，据报道分别为青春期前（1 和 2 期）、青春期（3 和 4 期）和青春期后（5 和 6 期），该方法已被推荐用于正畸治疗时机的规划。该方法的可靠使用意味着一旦生长高峰期结束，青春期阶段必须成熟为青春期后阶段。本研究旨在确定所有受试者是否都达到了青春期后 CVM 阶段 5 或 6。
本研究共纳入 450 名成年正畸患者（女性 270 名，男性 180 名；平均年龄 30.4±27.3 岁；年龄范围 20-45 岁），所有患者均拍摄侧位头颅片。采用定制的头影测量分析，根据 C2 到 C4 的凹陷和 C3 和 C4 的形状，将每个记录转换为个体 CVM 代码。所检索的 CVM 代码，无论是符合报告标准（常规病例）还是不符合（例外病例），也被转换为 CVM 阶段和一个新引入的 CVM 评分（0-9），能够定义中间阶段。
最常见的 CVM 阶段是 5 期，而只有三分之一的样本达到了 CVM 阶段 6。多达约 11%的成年患者仍处于青春期 CVM 阶段 4。无论 CVM 阶段或 CVM 评分如何，性别之间或年龄之间均无显著差异。C4 呈矩形垂直形状的仅占 16.4%。
维持青春期 CVM 阶段 4 的成年人群比例不高，但从临床角度来看仍然相关。鉴于这一发现，仅基于 CVM 规划治疗时机的方法似乎不完全可靠。
