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永久性下颌尖牙萌出中系带道形态变化的三维分析。

Morphological variation of gubernacular tracts for permanent mandibular canines in eruption: a three-dimensional analysis.

机构信息

State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, Hubei 430079, China.

Department of Oral Radiology, School & Hospital of Stomatology, Wuhan University, Wuhan, Hubei 430079, China.

出版信息

Dentomaxillofac Radiol. 2024 Jan 11;53(1):60-66. doi: 10.1093/dmfr/twad008.

DOI:10.1093/dmfr/twad008
PMID:38214943
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11003659/
Abstract

OBJECTIVES

This study aims to evaluate the morphological features of gubernacular tract (GT) for erupting permanent mandibular canines at different ages from 5 to 9 years old with a three-dimensional (3D) measurement method.

METHODS

The cone-beam CT images of 50 patients were divided into five age groups. The 3D models of the GT for mandibular canines were reconstructed and analysed. The characteristics of the GT, including length, diameter, ellipticity, tortuosity, superficial area, volume, and the angle between the canine and GT, were evaluated using a centreline fitting algorithm.

RESULTS

Among the 100 GTs that were examined, the length of the GT for mandibular canines decreased between the ages of 5 and 9 years, while the diameter increased until the age of 7 years. Additionally, the ellipticity and tortuosity of the GT decreased as age advanced. The superficial area and volume exhibited a trend of initially increasing and then decreasing. The morphological variations of the GT displayed heterogeneous changes during different periods.

CONCLUSIONS

The 3D measurement method effectively portrayed the morphological attributes of the GT for mandibular canines. The morphological characteristics of the GT during the eruption process exhibited significant variations. The variations in morphological changes may indicate different stages of mandibular canine eruption.

摘要

目的

本研究旨在通过三维（3D）测量方法评估 5 至 9 岁萌出恒下尖牙时 gubernacular 道（GT）的形态特征。

方法

将 50 名患者的锥形束 CT 图像分为 5 个年龄组。重建和分析 GT 用于下颌尖牙的 3D 模型。使用中心线拟合算法评估 GT 的特征，包括长度、直径、椭圆度、曲折度、表面积、体积以及犬齿与 GT 之间的角度。

结果

在检查的 100 个 GT 中，GT 用于下颌尖牙的长度在 5 至 9 岁之间减少，而直径在 7 岁之前增加。此外，GT 的椭圆度和曲折度随着年龄的增长而降低。表面积和体积呈现出先增加后减少的趋势。GT 的形态变化在不同时期表现出不均匀的变化。

结论

3D 测量方法有效地描绘了 GT 用于下颌尖牙的形态特征。GT 在萌出过程中的形态特征存在显著变化。形态变化的变化可能表明下颌尖牙萌出的不同阶段。