Ordinola-Zapata R, Monteiro Bramante C, Gagliardi Minotti P, Cavalini Cavenago B, Gutmann J L, Moldauer B I, Versiani M A, Hungaro Duarte M A
Department of Endodontics, Bauru Dental School, University of São Paulo, Bauru, Brazil.
Department of Endodontics, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, TX, USA.
Int Endod J. 2015 Aug;48(8):807-13. doi: 10.1111/iej.12380. Epub 2014 Oct 10.
To describe morphometric aspects of the internal anatomy of C-shaped mandibular premolars from a Brazilian subpopulation using micro-CT analysis.
First mandibular premolars with radicular grooves (n = 123) were scanned using a micro-computed tomography system. After cross-section analysis, 83 specimens were identified with a C-shaped canal and selected for micro-CT analysis. Number and location of canals according to Vertucci's classification, distances between anatomic landmarks, occurrence of apical deltas, furcation canals, prevalence of C-shaped cross-sections at five levels as well as 2-dimensional analysis (Area, perimeter, roundness, aspect ratio, major and minor diameters) were performed for the more prevalent anatomical features. Data were compared statistically using Kruskal-Wallis tests (α = 0.05).
The more prevalent anatomical types according to Vertucci's classification were Type I (13%), III (8%), V (37%) and VII (2%). Mean distances from the furcation to the cemento-enamel junction were in the range of 5.36-5.65 mm. Apical deltas and furcation canals were present in 36 (43%) and 27 (33%) specimens, respectively. C-shaped cross-sections were more prevalent at the middle (56%) and apical middle levels (81%). Overall, significant differences were found in the 2-dimensional analyses between single canals at the apical third and buccal and lingual canals of Vertucci's V classification (P < 0.05).
In this Brazilian subpopulation, C-shaped canal configuration of the root canal system was found in 67% of extracted first mandibular premolars with radicular grooves. Vertucci's types I and V were the most prevalent anatomical variations. C-shaped cross-sections were more prevalent in the middle third, and the presence of apical deltas was the most common feature in the apical third.
使用显微CT分析描述巴西亚人群C形下颌前磨牙内部解剖结构的形态计量学特征。
使用微型计算机断层扫描系统对有根沟的下颌第一前磨牙（n = 123）进行扫描。经过横断面分析后，识别出83个具有C形根管的标本并选择用于显微CT分析。根据Vertucci分类法对根管的数量和位置、解剖标志之间的距离、根尖分歧的出现情况、根分叉根管、五个水平处C形横截面的发生率以及更常见解剖特征的二维分析（面积、周长、圆度、纵横比、长径和短径）进行分析。使用Kruskal-Wallis检验（α = 0.05）对数据进行统计学比较。
根据Vertucci分类法，最常见的解剖类型为I型（13%）、III型（8%）、V型（37%）和VII型（2%）。从根分叉到牙骨质-釉质界的平均距离在5.36 - 5.65毫米范围内。根尖分歧和根分叉根管分别出现在36个（43%）和27个（33%）标本中。C形横截面在中部（56%）和根尖中部水平（81%）更为常见。总体而言，在根尖三分之一处的单根管与Vertucci V分类的颊侧和舌侧根管之间的二维分析中发现了显著差异（P < 0.05）。
在这个巴西亚人群中，在67%有根沟的拔除下颌第一前磨牙中发现根管系统呈C形根管形态。Vertucci的I型和V型是最常见的解剖变异。C形横截面在中三分之一更为常见，根尖分歧的存在是根尖三分之一最常见的特征。
