Betancourt Pablo, Navarro Pablo, Muñoz Gonzalo, Fuentes Ramón
Research Center in Dental Sciences (CICO), Endodontic Laboratory, Dental School, Universidad de La Frontera, Temuco, Chile.
Integral Adultos Department, Dental School, Universidad de La Frontera, Claro Solar 115, Temuco, Chile.
BMC Med Imaging. 2016 Dec 1;16(1):66. doi: 10.1186/s12880-016-0168-2.
Several articles have used cone beam computed tomography (CBCT) to study the morphology of the maxillary molars and to ascertain its ability to visualize the second mesiobuccal canal (MB2); however, its geometric location has not been examined in depth. The aim of this study was to describe in vivo the prevalence and location of the MB2 in the mesiobuccal root of the first maxillary molar (1MM) and the second maxillary molar (2MM) through CBCT imaging.
Five hundred fifty CBCT images of the 1MM and 550 of the 2MM were analyzed. To detect the MB2 canal, the observation and measurements were done 1 mm apically to the pulpal floor to standardize the methodology. The geometric location of the central point of the MB2 canal (PMB2) was measured in relation to the central point of the mesiobuccal canal (PMB1) and in relation to the line projected between the PMB1 and the central point of the palatal canals (PP). The data were analyzed using descriptive statistics, with a value of P < 0.05 being statistically significant.
In the 1MM, the prevalence of the MB2 canal was 69.82% and was more frequent in women (p = 0.005). The distance between PMB1 and PP was 7.64 ± 1.04 mm. The average distance between PMB1 and PMB2 was 2.68 ± 0.49 mm, and for PMB2 and the line projected between the PMB1 and PP canals was 1.25 ± 0.34 mm. In the 2MM, the MB2 canal was identified in 46.91% and was more frequent in men (p = 0.000). The distance between PMB1 and PP was 7.02 ± 1.30. The average distance between PMB1 and PMB2 was 2.41 ± 0.64 mm, and for the PMB2 and the line projected between the PMB1 and PP canals was 0.98 ± 0.33 mm.
The MB2 canal was found in a high percentage of the sample. These results indicate that CBCT is an effective, high-precision diagnostic tool not only for detecting but also locating in vivo the MB2 canal in the mesiobuccal root of upper molars.
已有多篇文章使用锥形束计算机断层扫描（CBCT）研究上颌磨牙的形态，并确定其显示第二近中颊根管（MB2）的能力；然而，其几何位置尚未得到深入研究。本研究的目的是通过CBCT成像在体内描述上颌第一磨牙（1MM）和上颌第二磨牙（2MM）近中颊根中MB2的发生率和位置。
分析了550张1MM的CBCT图像和550张2MM的CBCT图像。为了检测MB2根管，在距髓室底根尖1mm处进行观察和测量，以使方法标准化。测量MB2根管中心点（PMB2）相对于近中颊根管中心点（PMB1）的几何位置，以及相对于PMB1与腭根管中心点（PP）之间投影线的几何位置。使用描述性统计分析数据，P值<0.05具有统计学意义。
在1MM中，MB2根管的发生率为69.82%，在女性中更常见（p = 0.005）。PMB1与PP之间的距离为7.64±1.04mm。PMB1与PMB2之间的平均距离为2.68±0.49mm，PMB2与PMB1和PP根管之间投影线的平均距离为1.25±0.34mm。在2MM中，MB2根管的识别率为46.91%，在男性中更常见（p = 0.000）。PMB1与PP之间的距离为7.02±1.30。PMB1与PMB2之间的平均距离为2.41±0.64mm，PMB2与PMB1和PP根管之间投影线的平均距离为0.98±0.33mm。
在高比例的样本中发现了MB2根管。这些结果表明，CBCT不仅是一种有效的、高精度的诊断工具，可用于检测上颌磨牙近中颊根中的MB2根管，还可用于在体内定位该根管。
