Dibaji Fateme, Shariati Roza, Moghaddamzade Behrang, Mohammadian Fateme, Sooratgar Aidin, Kharazifard Mohammadjavad
Department of Endodontics, Dental School, Tehran University of Medical Science, International Campus, Tehran, Iran.
Dentist, Tehran, Iran.
Dent Res J (Isfahan). 2022 Jan 28;19:5. doi: 10.4103/1735-3327.336690. eCollection 2022.
One of the main reasons for the failure of root canal treatment is the incomplete knowledge of the root canal system. With respect to the complexity of maxillary molars root canal system, and the possibility of the relationship between the buccolingual width of the mesiobuccal root and root canal morphology in maxillary molars, the aim of this study is to determine this relationship with cone-beam computed tomography (CBCT).
This study carried out on 311 CBCT scans. Maxillary first molars ( = 311) were evaluated in three sagittal, axial, and coronal planes. For each tooth the number of canals, presence of second mesiobuccal (MB2), buccolingual width of mesiobuccal root at the cementoenamel junction (CEJ), and mid-root level, and type of canals according to the Vertucci's classification were determined.
The results showed that 49.1% of first maxillary molars had 3 and 50.8% had four root canals. The most common canal type in the mesiobuccal root was Vertucci's Type I followed by Types II, IV, and V. The prevalence of MB2 in the Iranian subpopulation was 50.1%. In maxillary first molars with MB2, the buccolingual width of mesiobuccal root at the CEJ and mid-root level ( < 0.001) was significantly greater than the corresponding values in other one without MB2.
The results showed that the buccolingual width of mesiobuccal root in maxillary first molars at the CEJ level and mid-root was correlated with the number of root canals.
根管治疗失败的主要原因之一是对根管系统的认识不全面。鉴于上颌磨牙根管系统的复杂性，以及上颌磨牙近中颊根颊舌径与根管形态之间可能存在的关系，本研究旨在通过锥形束计算机断层扫描（CBCT）确定这种关系。
本研究对311例CBCT扫描进行分析。对上颌第一磨牙（n = 311）在矢状面、轴面和冠状面三个平面进行评估。确定每颗牙齿的根管数量、第二近中颊根（MB2）的存在情况、在牙骨质釉质界（CEJ）和牙根中部水平的近中颊根颊舌径，以及根据Vertucci分类法的根管类型。
结果显示，49.1%的上颌第一磨牙有3个根管，50.8%有4个根管。近中颊根最常见的根管类型是Vertucci I型，其次是II型、IV型和V型。伊朗亚组中MB2的发生率为50.1%。在上颌第一磨牙有MB2的情况下，其在CEJ和牙根中部水平的近中颊根颊舌径（P < 0.001）显著大于无MB2的相应值。
结果表明，上颌第一磨牙在CEJ水平和牙根中部的近中颊根颊舌径与根管数量相关。
