Department of Oral and Dental Sciences, University of Bologna, Bologna, Italy.
Acta Odontol Scand. 2013 May-Jul;71(3-4):650-5. doi: 10.3109/00016357.2012.704393. Epub 2012 Jul 19.
The 'retromolar' nerve is a collateral branch of the inferior alveolar nerve. Cone-beam computed tomography (CBCT) provides higher resolution images. This CBCT study reports the frequency of the retromolar nerve.
From 2007-2010 the CBCT study of 233 hemi-mandibles have been examined. The CBCT study was obtained from an investigation of the posterior mandibular region in 187 patients suffering from different pathologies and it was aimed at detecting in patients the presence of a retromolar canal and foramen.
Thirty-four retromolar canals with a foramen were detected on 233 CBCT (14.6%) in 30 out of 187 patients (16%). In the 46 patients who underwent CBCT bilaterally, the retromolar canal was found in nine subjects (19.6%) and was present bilaterally in four subjects, for an incidence of 8.7%.
The results suggest that the radiological frequency of the retromolar nerve is notable, with a possible relevance in the surgical approach of the mandibular retromolar area. The presence of a retromolar canal, well detected with CBCT, may warn clinicians about the possibility of inadequate pre-surgical anaesthesia, local intra-operative bleeding and post-operative alterations of the sensation in the third molar area.
“磨牙后”神经是下颌神经的分支。锥形束 CT（CBCT）提供更高的分辨率图像。本 CBCT 研究报告了磨牙后神经的频率。
2007 年至 2010 年间，对 233 例半下颌骨进行了 CBCT 研究。CBCT 研究是从 187 名患有不同疾病的患者的下颌后区调查中获得的，旨在检测患者中是否存在磨牙后管和孔。
在 187 名患者中的 30 名（16%）中，在 233 例 CBCT 中检测到 34 个带有孔的磨牙后管（14.6%）。在双侧接受 CBCT 的 46 名患者中，9 名（19.6%）存在磨牙后管，4 名双侧存在磨牙后管，发生率为 8.7%。
结果表明，磨牙后神经的放射学频率相当高，这可能与下颌磨牙后区的手术入路有关。磨牙后管的存在，用 CBCT 可以很好地检测到，这可能会提醒临床医生注意术前麻醉不足、局部术中出血和术后第三磨牙区域感觉改变的可能性。
