Department of Oral and Maxillofacial Surgery, Thai Moogambigai Dental College and Hospital, Dr. MGR Educational and Research Institute (Deemed to be University), Chennai, India.
Department of Oral Medicine and Radiology, Thai Moogambigai Dental College and Hospital, Chennai, India.
Clin Implant Dent Relat Res. 2018 Aug;20(4):531-534. doi: 10.1111/cid.12609. Epub 2018 Apr 6.
Anterior loop of the mental nerve is a very important anatomic landmark in implant placement and anterior mandibular osteotomies.
Two-dimensional imaging techniques are not competent enough to locate and measure the mental nerve loop in majority of the cases. Any injury to this loop results in pain/paresthesia/numbness in the region supplied by the mental nerve. The aim of this study is to analyze the prevalence and measure the length of the loop using cone beam computerized tomography (CBCT) and calculate the average length and prevalence so that a safe margin can be given while placing the implants or the osteotomy cuts in the premolar region.
A cross-sectional study was done using CBCT images of 85 patients taken for impaction surgery. The length of the loop was measured in mm using standardized lines drawn along specific anatomic landmarks.
In our study 11.76% of patients had anterior loop in their mental nerve. Mean length of the mental nerve loop was calculated and found to be 2.79 mm.
A margin of 4 mm anterior to the mental foramen should be safe to avoid any damage to the mental nerve loop bundle in majority of the cases where the loop is present.
在前颌骨切开术中，颏神经前支是一个非常重要的解剖学标志，在种植体植入中也很重要。
二维成像技术在大多数情况下不足以定位和测量颏神经环。该神经环的任何损伤都会导致颏神经支配区域的疼痛/感觉异常/麻木。本研究的目的是使用锥形束计算机断层扫描（CBCT）分析该神经环的出现率，并测量其长度，计算平均长度和出现率，以便在前磨牙区植入种植体或进行骨切开时，可以安全地留出间隙。
对 85 例行拔牙手术的患者的 CBCT 图像进行了横断面研究。使用沿特定解剖标志绘制的标准线测量神经环的长度（以毫米计）。
在我们的研究中，11.76%的患者存在颏神经前支神经环。计算出颏神经环的平均长度为 2.79 毫米。
在大多数情况下，如果存在神经环，在颏孔前 4 毫米处应该是安全的，可以避免对颏神经环束的任何损伤。
