Mirza Mubashir Baig
Conservative Dental Science Department, College of Dentistry, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia.
Diagnostics (Basel). 2025 Jul 6;15(13):1721. doi: 10.3390/diagnostics15131721.
A thorough understanding of tooth anatomy is essential for effective root canal treatment. This study aims to investigate the root canal morphology of mandibular incisors (MIs) and the presence of distolingual roots in mandibular first molars (MFMs) and to explore the potential correlation between these anatomical variations. A total of 562 CBCT scans were retrospectively analyzed, corresponding to 1124 mandibular central incisors (MCIs), mandibular lateral incisors (MLIs), and MFMs each. The DLR in MFMs was correlated with the complex anatomy in MIs and analyzed using a chi-square test, with the odds ratio obtained through binary regression analysis. Differences related to gender, site, and age were analyzed using the chi-square test. Most MI scans revealed Vertucci Type I canal morphology, with a higher percentage in MCIs (71.1%) than MLIs (64.9%). Additionally, 5.25% of MFM scans indicated a DLR, with a higher prevalence in males (3.5%) and younger individuals (3.4%); however, a statistically significant difference was observed only in MCIs ( = 0.035) across different age groups. The study also identified a highly significant difference in complex canal anatomy, comparing both MIs on either side and the presence of DLR in MFMs ( < 0.001). Furthermore, the relationship between complex canal systems in MIs and MFMs with DLR was confirmed. In conclusion, the Vertucci Type I canal configuration was predominant in both MIs, followed by Type III. The DLR was present in 5.25% of the total scans, and its presence strongly correlated with complex morphology in both MIs.
全面了解牙齿解剖结构对于有效的根管治疗至关重要。本研究旨在调查下颌切牙（MIs）的根管形态以及下颌第一磨牙（MFMs）中舌侧远中根的存在情况，并探讨这些解剖变异之间的潜在相关性。共回顾性分析了562例CBCT扫描，分别对应1124颗下颌中切牙（MCIs）、下颌侧切牙（MLIs）和MFMs。MFMs中的舌侧远中根与MIs的复杂解剖结构相关，并使用卡方检验进行分析，通过二元回归分析获得优势比。使用卡方检验分析与性别、部位和年龄相关的差异。大多数MI扫描显示为Vertucci I型根管形态，MCIs中的比例（71.1%）高于MLIs（64.9%）。此外，5.25%的MFM扫描显示有舌侧远中根，男性（3.5%）和年轻个体（3.4%）中的患病率较高；然而，仅在不同年龄组的MCIs中观察到统计学上的显著差异（=0.035）。该研究还发现，两侧的MIs以及MFMs中舌侧远中根的存在情况在复杂根管解剖结构上存在高度显著差异（<0.001）。此外，证实了MIs和MFMs中具有舌侧远中根的复杂根管系统之间的关系。总之，Vertucci I型根管形态在MIs中占主导地位，其次是III型。舌侧远中根在总扫描中的占比为5.25%，其存在与MIs中的复杂形态密切相关。
