Milanezi de Almeida Marcela, Bernardineli Norberti, Ordinola-Zapata Ronald, Villas-Bôas Marcelo Haas, Amoroso-Silva Pablo Andrés, Brandão Christian Giampietro, Guimarães Bruno Martini, Gomes de Moraes Ivaldo, Húngaro-Duarte Marco Antonio
Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
J Endod. 2013 Dec;39(12):1529-33. doi: 10.1016/j.joen.2013.08.033. Epub 2013 Oct 15.
This study aimed to describe the anatomy of the mandibular incisors by using micro-computed tomography.
Mandibular incisors (n = 340) were scanned at 19-μm voxel size resolution, and the numbers of canals were classified according to Vertucci classification, as well as the major and minor diameters of the root and root canals, presence of oval canals, and three-dimensional analysis of the apical third were also measured. Data were presented in terms of median and range for each anatomic classification.
Overall, the specimens had 1 root canal (N = 257). The second most prevalent anatomy was Vertucci type III (N = 56). These anatomies represent 92% of the sample. The medians of the major diameter at the 1-, 2-, and 3-mm level of the most prevalent anatomies were 0.36, 0.39, and 0.47 mm for type I and 0.41, 0.51, and 0.66 mm for type III, respectively. The apical volume appears to be constant among these anatomies (0.63 and 0.59 mm(3)). Oval canals were found at the 1-mm apical level, with a prevalence of 16.7% for Vertucci type I and 37.5% for Vertucci type III. The presence of oval canals increased at the 3-mm apical level to 32.4% and 76.2% for Vertucci type I and III classifications, respectively.
Type I and III configurations represent 92% of the mandibular incisors studied. Within these anatomic configurations, oval-shaped canals in the apical third were not uncommon and more prevalent in the type III anatomy.
本研究旨在通过显微计算机断层扫描描述下颌切牙的解剖结构。
以19μm体素大小分辨率扫描下颌切牙（n = 340），根据韦尔图奇分类法对根管数量进行分类，并测量牙根和根管的主要及次要直径、椭圆形根管的存在情况，以及根尖三分之一的三维分析。数据以每种解剖分类的中位数和范围表示。
总体而言，标本有1个根管（N = 257）。第二常见的解剖结构是韦尔图奇III型（N = 56）。这些解剖结构占样本的92%。最常见解剖结构在1mm、2mm和3mm水平的主要直径中位数，I型分别为0.36mm、0.39mm和0.47mm，III型分别为0.41mm、0.51mm和0.66mm。这些解剖结构的根尖体积似乎恒定（0.63和0.59mm³）。在根尖1mm水平发现椭圆形根管，韦尔图奇I型的患病率为16.7%，III型为37.5%。在根尖3mm水平，韦尔图奇I型和III型分类中椭圆形根管的存在率分别增加到32.4%和76.2%。
I型和III型结构占所研究下颌切牙的92%。在这些解剖结构中，根尖三分之一的椭圆形根管并不少见，且在III型解剖结构中更常见。
