■本研究旨在确定1根下颌第二磨牙(MnSM)牙齿对下颌中切牙(MnCI)根管解剖复杂性的影响,下颌侧切牙(MnLI),下颌犬(MnCn),下颌第一前磨牙(MnFP),下颌第二前磨牙(MnSP),和下颌第一磨牙(MnFM)牙齿。
■检查了600例完整下牙列患者的锥形束计算机断层扫描图像。确定了具有1根MnSM的个体,并将其他牙齿的根管解剖结构的复杂性与没有1根MnSM的个体进行了比较(第1组;具有至少一个1根MnSM的受试者,第2组;在两个MnSM中都有超过一个根的受试者)。MnCIs的第二条运河,MnLI,MnCns,MnFPs,MnSP表明根管复杂。MnFM中第三根的存在被记录为复杂的。
■1根MnSM的患病率为12.2%,其中C形根类型最普遍(9%)。MnCI中复杂的根管较少(p=0.02),MnLI(p<0.001),和MnFP(p<0.001)在第1组中。其他牙齿组间无差异(p>0.05)。根据Logistic回归分析,1根右MnSM对MnLI和MnFP的复杂管道系统有负面影响。左侧MnSM是左侧MnLI和两个MnFP的解释变量。
■在具有单根MnSM的个体中,除MnFM外,所有牙齿均观察到较不复杂的根管系统。
UNASSIGNED: This study aimed to determine the effects of 1-rooted mandibular second molar (MnSM) teeth on root canal anatomy complexities of the mandibular central incisor (MnCI), mandibular lateral incisor (MnLI), mandibular canine (MnCn), mandibular first premolar (MnFP), mandibular second premolar (MnSP), and mandibular first molar (MnFM) teeth.
UNASSIGNED: Cone-beam computed tomography images of 600 patients with full lower dentition were examined. Individuals with 1-rooted MnSMs were determined, and the complexity of root canal anatomy of other teeth was compared with individuals without 1-rooted MnSMs (Group-1; subjects with at least one 1-rooted MnSM, Group-2; subjects with more than a single root in both MnSMs). A second canal in MnCIs, MnLIs, MnCns, MnFPs, and MnSPs indicated a complicated root canal. The presence of a third root in MnFMs was recorded as complicated.
UNASSIGNED: The prevalence of 1-rooted MnSMs was 12.2%, with the C-shaped root type being the most prevalent (9%). There were fewer complicated root canals in MnCIs (p = 0.02), MnLIs (p < 0.001), and MnFPs (p < 0.001) in Group 1. The other teeth showed no difference between the groups (p > 0.05). According to logistic regression analysis, 1-rooted right MnSMs had a negative effect on having complex canal systems of MnLIs and MnFPs. Left MnSMs were explanatory variables on left MnLIs and both MnFPs.
UNASSIGNED: In individuals with single-rooted MnSMs, a less complicated root canal system was observed in all teeth except the MnFMs.