Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010, Bern, Switzerland.
Department of Periodontology and Operative Dentistry, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany.
Sci Rep. 2021 Oct 28;11(1):21281. doi: 10.1038/s41598-021-00758-w.
The aim of this study was to investigate the root canal system morphology by means of a root canal configuration (RCC) classification described with a four-digit system, the physiological foramen geometry and accessory canal frequency and morphology, of 101 mandibular canines (MaCa) of a Swiss-German population by means of micro-computed tomography. Micro-CT examination of the MaCa was performed and the obtained images analyzed with a 3D imaging software. In single-rooted MaCas, the most frequently observed RCCs were 1-1-1/1 (74.5%) and 1-1-1/2 (14.3%). Seven other RCCs were less frequently observed with a frequency from 4.1 to 1.0%. One physiological foramen was observed in 80.6% of the MaCas, two in 16.3%, three in 1.0% and four in 2.0%. Accessory and connecting canals were apparent only in the middle and apical root thirds. Two-rooted MaCas occurred less frequently (n = 3). When one physiological foramen was present, the mean size of the narrow and wide diameters were 0.28 mm (± 0.07) and 0.40 mm (± 0.11), while the distance between physiological and anatomical foramen was 0.45 mm (± 0.17). MaCas are predominantly single-rooted teeth with a 1-1-1/1 or 1-1-1/2 RCC. Most MaCas had one physiological foramen with an oval shape.
本研究旨在通过微计算机断层扫描（micro-computed tomography，micro-CT）研究瑞士-德国人群 101 颗下颌前磨牙（mandibular canines，MaCa）的根管形态、生理根尖孔形态和副根管频率及形态，采用四位数系统描述根管构型（root canal configuration，RCC）分类。对 MaCa 进行 micro-CT 检查，并用 3D 成像软件对获得的图像进行分析。在单根 MaCa 中，最常见的 RCC 为 1-1-1/1（74.5%）和 1-1-1/2（14.3%）。其他 7 种 RCC 的频率从 4.1%到 1.0%不等，相对较少见。80.6%的 MaCa 只有一个生理根尖孔，16.3%的 MaCa 有两个，1.0%的 MaCa 有三个，2.0%的 MaCa 有四个。副根管和连接根管仅在前磨牙的中、根尖三分之一处明显可见。双根 MaCa 较少见（n=3）。当存在一个生理根尖孔时，窄径和宽径的平均值分别为 0.28mm（±0.07）和 0.40mm（±0.11），而生理根尖孔和解剖根尖孔之间的距离为 0.45mm（±0.17）。MaCa 主要为具有 1-1-1/1 或 1-1-1/2 RCC 的单根牙齿。大多数 MaCa 只有一个呈椭圆形的生理根尖孔。
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