Amoroso-Silva Pablo Andrés, Ordinola-Zapata Ronald, Duarte Marco Antonio Hungaro, Gutmann James L, del Carpio-Perochena Aldo, Bramante Clovis Monteiro, de Moraes Ivaldo Gomes
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.
Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.
J Endod. 2015 Jun;41(6):890-5. doi: 10.1016/j.joen.2015.01.021. Epub 2015 Feb 27.
The goal of the present study was to evaluate the morphometric aspects of the internal anatomy of the root canal system of mandibular second molars with C-shaped canals.
Fifty-two extracted second mandibular molars with C-shaped canals, fused roots, and radicular grooves were selected from a Brazilian population. The samples were scanned with a micro-computed tomographic scanner at a voxel size of 19.6 μm. The root canal cross sections were recorded as C1, C2, C3, and C4 root canal configurations according to the modified Melton classification. Morphometric parameters, including the major and minor diameters of the root canals, the aspect ratio, the roundness, and the tridimensional configuration (merging, symmetric, and asymmetric), were evaluated.
The 3-dimensional reconstruction images of the teeth indicated an even distribution within the sample. The analysis of the prevalence of the different cross-sectional configurations of the C-shaped molars revealed that these were predominantly of the C4 and C3 configurations (1 mm from the apex) and the C1 and C2 configurations in the cervical third. According to the morphometric parameters, the C1 and the distal aspect of the C2 configurations exhibited the lowest roundness values and higher values for the area, major diameter, and aspect ratio in the apical third.
Mandibular molars with C-shaped root canals exhibited similar distributions of symmetric, asymmetric, and merging type canals. The C1 configuration and the distal aspect of the C2 configuration exhibited the highest area values, low roundness values, and large apical diameters.
本研究的目的是评估具有C形根管的下颌第二磨牙根管系统内部解剖结构的形态学特征。
从巴西人群中选取52颗拔除的下颌第二磨牙，这些牙齿具有C形根管、融合根和根沟。使用微计算机断层扫描仪以19.6μm的体素大小对样本进行扫描。根据改良的梅尔顿分类法，将根管横截面记录为C1、C2、C3和C4根管形态。评估了形态学参数，包括根管的长径和短径、纵横比、圆度以及三维形态（融合、对称和不对称）。
牙齿的三维重建图像显示样本内分布均匀。对C形磨牙不同横截面形态的患病率分析表明，在根尖1mm处主要为C4和C3形态，在颈三分之一处主要为C1和C2形态。根据形态学参数，C1和C2形态的远中部分在根尖三分之一处圆度值最低，面积、长径和纵横比的值较高。
具有C形根管的下颌磨牙对称型、不对称型和融合型根管的分布相似。C1形态和C2形态的远中部分面积值最高，圆度值低，根尖直径大。
