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Abstract：
BACKGROUND: Understanding the tooth anatomy is crucial for ensuring effective endodontic treatment. This study investigated the root canal morphology of the second mesiobuccal (MB2) canal in maxillary first molars (MFMs) in a Chinese population using cone-beam computed tomography (CBCT).
METHODS: This study evaluated 486 MFMs with MB2 canals from 285 participants undergoing CBCT examination and determined the Vertucci\'s classification and position of the MB2 canal orifice. The prevalence of the MB2 canal was correlated with the sex, age, and tooth side. The correlations between the prevalence of the MB2 canal and sex and tooth side were assessed using the Fisher\'s exact test. The chi-square test was used for evaluating the correlation between the prevalence of the MB2 canal and age.
RESULTS: The number of type II, III, IV, V, VI, VII, and other root canals in the MFMs was 30.9%, 0.6%, 65.0%, 1.2%, 1.2%, 0.4%, and 0.6%, respectively. Among the 201 cases with bilateral inclusion, 87.6% showed consistent canal configuration. Results of the first clear apparent position (FCAP) of the MB2 canals showed that 434, 44, and 3 teeth had FCAP at the upper, middle, and bottom one-third of the root, respectively. The FCAPs of the MB2 canal in the MFMs with types II, IV, and VI, as well as types III and V canals showed significant differences (p<0.05). The horizontal distance between the MB1 and MB2 canal orifices in the type II canals of MFMs was significantly lesser than those in the type IV canals of MFMs (p < 0.01). The longitudinal distance between the pulp chamber floor plane and MB2 canal orifice significantly correlated with age (p < 0.05).
CONCLUSIONS: The morphology of the mesiobuccal root canal in the MFMs is complex. Complete understanding of the anatomical morphology of the root canal combined with the CBCT and dental operating microscope is necessary for the accurate detection of the MB2 canal and consequently improved success rate of root canal treatment. Our study findings can help endodontists improve endodontic treatment outcomes.
METHODS: This study evaluated 486 MFMs with MB2 canals from 285 participants undergoing CBCT examination and determined the Vertucci\'s classification and position of the MB2 canal orifice. The prevalence of the MB2 canal was correlated with the sex, age, and tooth side. The correlations between the prevalence of the MB2 canal and sex and tooth side were assessed using the Fisher\'s exact test. The chi-square test was used for evaluating the correlation between the prevalence of the MB2 canal and age.
RESULTS: The number of type II, III, IV, V, VI, VII, and other root canals in the MFMs was 30.9%, 0.6%, 65.0%, 1.2%, 1.2%, 0.4%, and 0.6%, respectively. Among the 201 cases with bilateral inclusion, 87.6% showed consistent canal configuration. Results of the first clear apparent position (FCAP) of the MB2 canals showed that 434, 44, and 3 teeth had FCAP at the upper, middle, and bottom one-third of the root, respectively. The FCAPs of the MB2 canal in the MFMs with types II, IV, and VI, as well as types III and V canals showed significant differences (p<0.05). The horizontal distance between the MB1 and MB2 canal orifices in the type II canals of MFMs was significantly lesser than those in the type IV canals of MFMs (p < 0.01). The longitudinal distance between the pulp chamber floor plane and MB2 canal orifice significantly correlated with age (p < 0.05).
CONCLUSIONS: The morphology of the mesiobuccal root canal in the MFMs is complex. Complete understanding of the anatomical morphology of the root canal combined with the CBCT and dental operating microscope is necessary for the accurate detection of the MB2 canal and consequently improved success rate of root canal treatment. Our study findings can help endodontists improve endodontic treatment outcomes.
摘要：
背景：了解牙齿解剖结构对于确保有效的牙髓治疗至关重要。这项研究使用锥形束计算机断层扫描（CBCT）研究了中国人群上颌第一磨牙（MFM）第二近颊（MB2）管的根管形态。
方法：这项研究评估了285例接受CBCT检查的参与者的486例MB2运河MFM，并确定了Vertucci的分类和MB2管口的位置。MB2管的患病率与性别相关，年龄,牙齿侧。使用Fisher精确检验评估了MB2管的患病率与性别和牙齿侧之间的相关性。采用卡方检验评价MB2管患病率与年龄的相关性。
结果：类型II的数量，III,IV,V,VI,VII,MFM中其他根管占30.9%，0.6%，65.0%,1.2%,1.2%,0.4%,和0.6%，分别。在201例双边纳入的病例中，87.6%显示一致的运河配置。MB2根管的第一个清晰表观位置（FCAP）的结果表明，434、44和3颗牙齿在上有FCAP，中间,底部三分之一的根，分别。II型MFM中MB2运河的FCAPs，IV,VI,以及III型和V型运河显示显着差异（p<0.05）。MFM的II型运河中MB1和MB2管口之间的水平距离明显小于MFM的IV型运河中的水平距离（p<0.01）。髓室底板平面与MB2管口之间的纵向距离与年龄显着相关（p<0.05）。
结论：MFM中近颊根管的形态是复杂的。结合CBCT和牙科手术显微镜，全面了解根管的解剖形态，对于准确检测MB2管，从而提高根管治疗的成功率是必要的。我们的研究结果可以帮助牙髓医生改善牙髓治疗结果。
方法：这项研究评估了285例接受CBCT检查的参与者的486例MB2运河MFM，并确定了Vertucci的分类和MB2管口的位置。MB2管的患病率与性别相关，年龄,牙齿侧。使用Fisher精确检验评估了MB2管的患病率与性别和牙齿侧之间的相关性。采用卡方检验评价MB2管患病率与年龄的相关性。
结果：类型II的数量，III,IV,V,VI,VII,MFM中其他根管占30.9%，0.6%，65.0%,1.2%,1.2%,0.4%,和0.6%，分别。在201例双边纳入的病例中，87.6%显示一致的运河配置。MB2根管的第一个清晰表观位置（FCAP）的结果表明，434、44和3颗牙齿在上有FCAP，中间,底部三分之一的根，分别。II型MFM中MB2运河的FCAPs，IV,VI,以及III型和V型运河显示显着差异（p<0.05）。MFM的II型运河中MB1和MB2管口之间的水平距离明显小于MFM的IV型运河中的水平距离（p<0.01）。髓室底板平面与MB2管口之间的纵向距离与年龄显着相关（p<0.05）。
结论：MFM中近颊根管的形态是复杂的。结合CBCT和牙科手术显微镜，全面了解根管的解剖形态，对于准确检测MB2管，从而提高根管治疗的成功率是必要的。我们的研究结果可以帮助牙髓医生改善牙髓治疗结果。
