Versiani M A, Pécora J D, Sousa-Neto M D
Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo, Ribeirão Preto, Brazil.
Int Endod J. 2013 Sep;46(9):800-7. doi: 10.1111/iej.12061. Epub 2013 Feb 12.
To investigate the anatomy of single-rooted mandibular canine teeth using microcomputed tomography (μCT).
One hundred straight single-rooted human mandibular canines were selected from a pool of extracted teeth and evaluated using μCT. The anatomy of each tooth (length of the roots, presence of accessory canals and apical deltas, position and major diameter of the apical foramen and distance between anatomical landmarks) as well as the two- and three-dimensional morphological aspects of the canal (area, perimeter, form factor, roundness, major and minor diameter, volume, surface area and structure model index) were evaluated. The results of the morphological analysis in each canal third were compared statistically using Friedman's test (α = 0.05).
The length of the roots ranged from 12.53 to 18.08 mm. Thirty-one specimens had no accessory canals. The location of the apical foramen varied considerably. The mean distance from the root apex to the major apical foramen was 0.27 ± 0.25 mm, and the major diameter of the major apical foramen ranged from 0.16 to 0.72 mm. Mean major and minor diameters of the canal 1 mm short of the foramen were 0.43 and 0.31 mm, respectively. Overall, the mean area, perimeter, form factor, roundness, major and minor diameters, volume, surface area and structure model index (SMI) were 0.85 ± 0.31 mm(2) , 3.69 ± 0.88 mm, 0.70 ± 0.09, 0.59 ± 0.11, 1.36 ± 0.36 mm and 0.72 ± 0.14 mm, 13.33 ± 4.98 mm(3) , 63.5 ± 16.4 mm(2) and 3.35 ± 0.64, respectively, with significant statistical difference between thirds (P < 0.05).
The anatomy and morphology of the root canal of single-rooted canines varied widely in different levels of the root.
使用微型计算机断层扫描（μCT）研究单根下颌尖牙的解剖结构。
从拔除的牙齿中选取100颗直的单根人类下颌尖牙，并用μCT进行评估。评估每颗牙齿的解剖结构（牙根长度、副根管和根尖分歧的存在情况、根尖孔的位置和主要直径以及解剖标志之间的距离）以及根管的二维和三维形态学方面（面积、周长、形态因子、圆度、长径和短径、体积、表面积和结构模型指数）。使用Friedman检验（α = 0.05）对每个根管三分之一处的形态学分析结果进行统计学比较。
牙根长度在12.53至18.08毫米之间。31个标本没有副根管。根尖孔的位置差异很大。从根尖到主要根尖孔的平均距离为0.27±0.25毫米，主要根尖孔的主要直径在0.16至0.72毫米之间。距根尖孔1毫米处根管的平均长径和短径分别为0.43毫米和0.31毫米。总体而言，平均面积、周长、形态因子、圆度、长径和短径、体积、表面积和结构模型指数（SMI）分别为0.85±0.31平方毫米、3.69±0.88毫米、0.70±0.09、0.59±0.11、1.36±0.36毫米和0.72±0.14毫米、13.33±4.98立方毫米、63.5±16.4平方毫米和3.35±0.64，根管三分之一处之间存在显著统计学差异（P < 0.05）。
单根尖牙根管的解剖结构和形态在牙根的不同水平上差异很大。
