Division of Oral and Maxillofacial Radiology of School of Dentistry Federal University of Ceará, Rua Monsenhor Furtado, 1273 Rodolfo Teófilo, Fortaleza-CE, Brazil. CEP: 60430-355
Med Oral Patol Oral Cir Bucal. 2020 May 1;25(3):e337-e345. doi: 10.4317/medoral.23350.
This study evaluated the epidemiological and morphological features of the mandibular incisive canal (MIC) using cone beam computed tomography (CBCT) in a significant sample of subjects in Brazil.
This retrospective, multicenter study assessed 847 CBCT scans performed at four oral imaging centers. The sample comprised CBCT images acquired from dentate individuals who presented at least from tooth 35 to tooth 45 in the anterior mandible region. Data regarding patient sex and age, and MIC linear measurements (length and diameter in mm), anatomical distances (to the alveolar, buccal and lingual cortexes, inferior border of the mandible, and adjacent teeth apexes), and location were obtained.
The MIC was more prevalent in women (76.3% [p<0.001]) between the fourth and sixth decades of life (p<0.001). It was present bilaterally (p<0.001) and exhibited a mean length of 7.7 mm (standard deviation [SD]=3.7 mm). Spearman correlation and logistic regression analysis revealed collinearity between age and linear measurements (p<0.05). The mean distances varied from the initial to the final portion of the MIC, respectively, in relation to the buccal cortex (mean=2.6 mm, SD=1.27; mean=3.96 mm; SD=1.43), to lingual cortex (mean=5.13 mm; SD=1.7; mean=4.61 mm, SD = 1.65), and to the inferior mandibular border (mean = 9.32 mm, SD=1.92; mean=8.76 mm, SD=2.07 mm). The difference in the proximity of the MIC to the apex of the inferior lateral incisor was statistically significant (p<0.05).
Results of this study revealed a high prevalence of MIC with a bilateral pattern in women who were between the fourth and sixth decades of life. Both the distance between the MIC and the lingual cortex of the mandibular alveolar bone, and the diameter of the MIC, decreased as its trajectory assumed a more anterior position.
本研究使用锥形束计算机断层扫描（CBCT）评估了巴西一个有代表性的样本中下颌切牙管（MIC）的流行病学和形态特征。
这是一项回顾性、多中心研究，评估了四个口腔影像中心的 847 例 CBCT 扫描。该样本包括来自下颌前牙区至少有 35 号至 45 号牙的 dentate 个体的 CBCT 图像。获得了患者性别和年龄、MIC 线性测量值（mm 长和直径）、解剖距离（到牙槽骨、颊侧和舌侧皮质、下颌下缘和相邻牙齿根尖）和位置的数据。
MIC 在 40 至 60 岁的女性中更为常见（76.3%[p<0.001]）。它是双侧的（p<0.001），平均长度为 7.7mm（标准差[SD]=3.7mm）。Spearman 相关分析和逻辑回归分析显示年龄和线性测量值之间存在共线性（p<0.05）。MIC 的初始和终末部分与颊侧皮质的平均距离分别为（mean=2.6mm，SD=1.27；mean=3.96mm；SD=1.43）、舌侧皮质（mean=5.13mm；SD=1.7；mean=4.61mm，SD=1.65）和下颌下缘（mean=9.32mm，SD=1.92；mean=8.76mm，SD=2.07mm）。MIC 与下侧切牙根尖的接近程度存在统计学差异（p<0.05）。
本研究结果显示，在 40 至 60 岁的女性中，MIC 具有较高的患病率，且呈双侧性。MIC 与下颌牙槽骨舌侧皮质之间的距离以及 MIC 的直径随着其轨迹向更前的位置变化而减小。
