Palma Luiz Felipe, Buck Ariane Fraga, Kfouri Flávio de Ávila, Blachman Isaac Tobias, Lombardi Leonardo Augusto, Cavalli Marcelo Arthur
Universidade Federal de São Paulo - UNIFESP, São Paulo, Brazil.
Universidade Metodista de São Paulo - UMESP, São Bernardo do Campo, Brazil.
Oral Maxillofac Surg. 2017 Sep;21(3):307-312. doi: 10.1007/s10006-017-0632-3. Epub 2017 Jun 1.
The purpose of this study was to carry out morphologic and topographic analyses of retromolar canals on cone beam computerized tomography (CBCT) scans, comparing findings to others obtained from the corresponding digital panoramic radiographs.
Sixty-one CBCT scans were analysed digitally, as well as their corresponding digital panoramic radiographs. The prevalence and distribution of these canals, foramen diameters, and intraosseous communications were also evaluated.
On CBCT scans, we found that 24.6% of individuals had at least one retromolar canal. The mean foramen diameter was slightly higher than 1 mm and we could not determine the intraosseous anatomical connections in most cases. The morphology and topography of the retromolar canals were not affected by gender and antimere. In addition, only 22.2% of all tomographically identified canals could be confirmed on digital panoramic radiographs (26.7% of such patients). Regarding all sample, 6.6% of individuals showed retromolar canals on digital panoramic radiographs.
We may consider that these structures are clinically relevant findings and, due to the low accuracy of the panoramic radiographs, high-quality tomographic exams should always be asked for presurgical treatment planning.
本研究旨在对锥形束计算机断层扫描（CBCT）图像上的磨牙后管进行形态学和局部解剖学分析，并将结果与相应数字全景X线片的结果进行比较。
对61例CBCT扫描图像及其相应的数字全景X线片进行了数字化分析。还评估了这些根管的发生率、分布、孔直径和骨内连通情况。
在CBCT扫描中，我们发现24.6%的个体至少有一条磨牙后管。平均孔直径略高于1毫米，在大多数情况下，我们无法确定骨内的解剖连接。磨牙后管的形态和局部解剖结构不受性别和对侧的影响。此外，在数字全景X线片上，所有经断层扫描识别出的根管中只有22.2%能够得到确认（此类患者中为26.7%）。在所有样本中，6.6%的个体在数字全景X线片上显示有磨牙后管。
我们可以认为这些结构是具有临床意义的发现，并且由于全景X线片的准确性较低，在进行术前治疗规划时，应始终要求进行高质量的断层扫描检查。
