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Abstract：
OBJECTIVE: 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.
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岁不同年龄的恒牙下颌犬萌出的gubernocular束（GT）的形态特征。
方法：将50例患者的锥形束CT图像分为5个年龄组。重建并分析了下颌犬GT的3D模型。GT的特点，包括长度,直径,椭圆率,弯曲，浅层区域,volume,以及犬科动物和GT之间的角度，使用中心线拟合算法进行评估。
结果：在接受检查的100GT中，下颌犬的GT长度在5至9岁之间减少，而直径增加直到7岁。此外,GT的椭圆率和弯曲度随着年龄的增长而降低。表面积和体积呈现先增大后减小的趋势。GT的形态变化在不同时期显示出异质变化。
结论：3D测量方法有效地描绘了下颌犬科动物GT的形态属性。喷发过程中GT的形态特征表现出明显的变化。形态变化可能表明下颌犬萌出的不同阶段。
方法：将50例患者的锥形束CT图像分为5个年龄组。重建并分析了下颌犬GT的3D模型。GT的特点，包括长度,直径,椭圆率,弯曲，浅层区域,volume,以及犬科动物和GT之间的角度，使用中心线拟合算法进行评估。
结果：在接受检查的100GT中，下颌犬的GT长度在5至9岁之间减少，而直径增加直到7岁。此外,GT的椭圆率和弯曲度随着年龄的增长而降低。表面积和体积呈现先增大后减小的趋势。GT的形态变化在不同时期显示出异质变化。
结论：3D测量方法有效地描绘了下颌犬科动物GT的形态属性。喷发过程中GT的形态特征表现出明显的变化。形态变化可能表明下颌犬萌出的不同阶段。
