Department for Oral and Craniomaxillofacial and Plastic Surgery, University of Cologne, Kerpener Strasse 62, 50931, Cologne, Germany.
Sci Rep. 2021 Apr 27;11(1):9024. doi: 10.1038/s41598-021-88379-1.
For medicolegal purposes, orthodontic or orthognathic treatment various stomatological staging technique for age estimation with appliance of conventional radiographic images have been published. It remains uninvestigated if cone beam computer-tomography delivers comparable staging results to the conventional radiographic stages of third molar analysis. We conducted a retrospective cross-sectional study of 312 patients aged 13-21 years. Dental age estimation staging technique, introduced by Nolla and Demirjian, were applied on the left lower third molar imaged by conventional panoramic radiographs and cone beam computer-tomography. It was investigated if 2D and 3D imaging presented different staging results for dental age estimation. In 21% the Demirjian's staging differed by a single stage between 2 and 3D images. The greatest congruence (87%) between 2 and 3D images was revealed for stage 7 (G). In contrary, stage 5 (E) presented the lowest level of congruence with 47.4%. The categorization of Nolla revealed divergences in staging for than two categorical variables in Nolla's stages 3, 4, 5 and 6. In general, the analysis of the data displayed the divergence for Nolla's stages 4-8. The staging results for 2D and 3D imaging in accordance to the rules of Nolla and Demirjian showed significant differences. Individuals of 18 years may present immature third molars, thus merely an immature third molar cannot reject legal majority. Nolla's and Demirjian's 2D and 3D imaging present significantly different staging results.
出于法医学目的，正畸或正颌治疗领域已经公布了各种用于年龄估计的口腔分期技术，这些技术都应用了常规放射影像设备。目前尚未研究锥形束计算机断层扫描（CBCT）是否能与第三磨牙分析的常规放射分期提供可比的分期结果。我们对 312 名年龄在 13-21 岁的患者进行了回顾性横断面研究。本研究应用了 Nolla 和 Demirjian 介绍的牙龄估计分期技术，对常规全景片和 CBCT 成像的左下第三磨牙进行了评估。研究了 2D 和 3D 成像在牙龄估计方面是否会呈现不同的分期结果。在 21%的患者中，Demirjian 的分期在 2D 和 3D 图像之间相差一个阶段。在 2D 和 3D 图像之间，第 7 期（G 期）的一致性最高（87%）。相反，第 5 期（E 期）的一致性最低，为 47.4%。在 Nolla 的分期中，第 3、4、5 和 6 期的两个以上分类变量的分期存在差异。总体而言，数据分析显示 Nolla 的第 4-8 期存在分歧。根据 Nolla 和 Demirjian 的规则，2D 和 3D 成像的分期结果存在显著差异。18 岁的个体可能存在未成熟的第三磨牙，因此仅仅是未成熟的第三磨牙不能否定其成年。Nolla 和 Demirjian 的 2D 和 3D 成像呈现出明显不同的分期结果。
