Dental Specialty Center, Brazilian Military Police, Minas Gerais, Brazil.
Department of Endodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey.
J Endod. 2023 Jun;49(6):730-734. doi: 10.1016/j.joen.2023.03.013. Epub 2023 Mar 31.
This report aims to communicate the discovery of a novel anatomy in a 3-rooted maxillary second molar, named as palato-mesiobuccal canal.
The tooth selected for this report was found incidentally as a result of a study on extracted maxillary molars that was being conducted for an unrelated purpose and involved hundreds of teeth. This 3-rooted maxillary second molar was scanned using a micro-computed tomography device set at a pixel size of 13.68 μm. The images were reconstructed with previously tested parameters resulting in the acquisition of 1655 axial cross-sections. Three-dimensional (3D) models of the internal and external anatomies were generated in Standard Tessellation Language (STL) format and were texturized to simulate the pulp tissue. The inner structure of the tooth was analyzed through the axial cross sections and the 3D volume was qualitatively evaluated.
The analysis of the 3D models revealed that the maxillary second molar under examination has 3 independent roots and 4 root canals. Each root (mesiobuccal, distobuccal, and palatal) contains 1 canal, while the fourth canal follows a unique path, originating in the coronal third of the palatal canal and proceeding in a buccal direction ultimately exiting through an independent foramen at the apex of the mesiobuccal root, near the mesiobuccal canal.
This brief communication reports the discovery of a novel anatomy in a 3-rooted maxillary second molar, named as palato-mesiobuccal canal, and provides important insights into the complexity of the root canal system in this group of teeth.
本报告旨在介绍在一颗 3 根上颌第二磨牙中发现的一种新解剖结构，命名为腭-近中颊管。
本报告中选择的牙齿是在一项针对上颌磨牙的研究中偶然发现的，该研究是为了一个与本文无关的目的而进行的，涉及数百颗牙齿。这颗 3 根上颌第二磨牙使用像素大小为 13.68μm 的微计算机断层扫描设备进行扫描。使用先前经过测试的参数重建图像，获得 1655 个轴向横截面。以标准 tessellation language（STL）格式生成内部和外部解剖的三维（3D）模型，并进行纹理化以模拟牙髓组织。通过轴向横截面分析牙齿的内部结构，并对 3D 体积进行定性评估。
3D 模型的分析显示，所检查的上颌第二磨牙有 3 个独立的根和 4 个根管。每个根（近中颊根、远中颊根和腭根）包含 1 个根管，而第 4 个根管则沿独特的路径起源于腭根管的冠部第 3 部分，并向颊侧行进，最终通过近中颊根根尖的一个独立孔口穿出，靠近近中颊根管。
本简要通讯报告了在一颗 3 根上颌第二磨牙中发现的一种新解剖结构，命名为腭-近中颊管，并提供了有关这组牙齿根管系统复杂性的重要见解。
