Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Periodontology and Operative Dentistry, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany.
Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland.
J Endod. 2020 Jun;46(6):794-800. doi: 10.1016/j.joen.2020.03.001. Epub 2020 Apr 13.
The aim of this study was to investigate the root canal system morphology of maxillary first premolars by means of micro-computed tomographic imaging in a Swiss-German population.
The root canal configuration (RCC) of 115 maxillary first premolars (Mx1Ps) were investigated by means of micro-computed tomographic imaging and 3-dimensional imaging. The RCC and the physiological foramina results are described by a 4-digit system code.
Twelve different RCCs were observed in 30 single-rooted Mx1Ps; 2-2-2/2 (30.0%), 1-2-2/2 (13.3%), 1-2-1/2 (10%), and 2-2-1/2 (10.0%) were the most frequent ones. Seven different RCCs were observed in 2-rooted Mx1Ps (n = 81) in which the 1-1-1/1 (56.8%), 1-1-1/2 (29.6%), and 1-1-2/2 (8.6%) in the buccal root and 1-1-1/1 (92.6%) and 1-1-1/2 (6.2%) in the palatal root RCCs appeared most frequently. Three-rooted Mx1Ps (n = 4) showed a 1-1-1/1 (100.0%) RCC in all roots. The buccal root canal in 2-rooted Mx1Ps had 1 physiological foramen in 59.3% and 2 in 40.7% and 1 to 6 accessory foramina in 38.2%. The palatal root canal showed 1 physiological foramen in 93.8% and 2 in 6.2% and 1 to 2 accessory foramina in 14.8%. Single-rooted Mx1Ps showed 1 physiological foramen in 10.0%, 2 in 70.0%, 3 in 13.3%, and 4 in 6.7% and 1 to 3 accessory foramina in 46.7%.
The results of this study provide detailed morphologic RCC information of Mx1Ps in a Swiss-German population. Single-rooted Mx1Ps showed morphologic diversifications more frequently than 2- or 3-rooted Mx1Ps. Within 2-rooted Mx1Ps, the buccal root had higher RCC variety, accessory canals, and foramina number than the palatal root.
本研究旨在通过瑞士-德国人群的微计算机断层扫描成像来研究上颌第一前磨牙的根管系统形态。
通过微计算机断层扫描和三维成像对 115 颗上颌第一前磨牙（Mx1Ps）的根管形态（RCC）进行了研究。RCC 和生理孔的结果用 4 位数字系统代码描述。
在 30 颗单根 Mx1Ps 中观察到 12 种不同的 RCC；2-2-2/2（30.0%）、1-2-2/2（13.3%）、1-2-1/2（10%）和 2-2-1/2（10.0%）最为常见。在 81 颗 2 根 Mx1Ps 中观察到 7 种不同的 RCC，其中颊根的 1-1-1/1（56.8%）、1-1-1/2（29.6%）和 1-1-2/2（8.6%）以及腭根的 1-1-1/1（92.6%）和 1-1-1/2（6.2%）最为常见。3 根 Mx1Ps（n=4）在所有根中均显示 1-1-1/1（100.0%）RCC。2 根 Mx1Ps 的颊根有 1 个生理孔占 59.3%，2 个占 40.7%，38.2%有 1 到 6 个副孔。腭根有 1 个生理孔占 93.8%，2 个占 6.2%，14.8%有 1 到 2 个副孔。单根 Mx1Ps 有 1 个生理孔占 10.0%，2 个占 70.0%，3 个占 13.3%，4 个占 6.7%，46.7%有 1 到 3 个副孔。
本研究为瑞士-德国人群上颌第一前磨牙的根管形态提供了详细的形态学信息。单根 Mx1Ps 的形态变化比 2 根或 3 根 Mx1Ps 更为频繁。在 2 根 Mx1Ps 中，颊根的 RCC 种类、副根管和孔数均高于腭根。
