Alyami Osama Saeed, Alotaibi Mazen Saeed, Koppolu Pradeep, Alosaimy Abdulrahman, Abdulghani Ashraf, Swapna Lingam Amara, Alotaibi Dalal H, Alqerban Ali, Sheethi Kizhakke Veetil
Department of Dentistry, King Saud Medical city, Riyadh, Saudi Arabia.
Department of Dentistry, Ministry Of Health, Riyadh, Saudi Arabia.
Saudi Dent J. 2021 Mar;33(3):124-130. doi: 10.1016/j.sdentj.2020.03.001. Epub 2020 Mar 14.
The portion of inferior alveolar nerve (IAN) existent anterior to the mental foramen, before parting the canal, is referred to as the anterior loop (AL) of the IAN. The presence of AL is important when placing the implant interforaminal area of the mandible. These anatomical discrepancies can be assessed by cone-beam CT (CBCT), for evaluating its position and exact location. The AL is classified into Types I, II and III. In Type I, Y-shaped anatomy; in Type II, anatomy is T-shaped; and in Type III, Y-shaped anatomy is seen, and the incisive branch is thicker as compared to the main branch.
In this study, we aim to analyse the prevalence of different types of AL of the IAN in Saudi sample population.
The present study is a retrospective analysis of 149 (86 female & 63 male) CBCT images of patients records from 2018 June to 2018 September in the department of implant dentistry, KSMC, Riyadh. The age range of the patients who participated in the study was 30-60 years. The mean age of female participants is 42.5 ± 5.8, for the male participants is 48.6 ± 11.4 years respectively.
The most frequent type of AL of mental nerve noticed on the right side was of type I (59.1%), followed by type II (27.5%) and type III (13.4%). The most frequent type of AL of mental nerve noticed on the left side was type I (61.7%), followed by type II (26.8%) and type III (11.4%).
The results of the study encourage the usage of CBCT for planning implant treatment. We also suggest that it is obligatory for professionals to categorise the presence of AL and to measure them appropriately when planning for the procedures in the interforaminal region.
在下颌骨管分支之前，位于颏孔前方的下牙槽神经（IAN）部分被称为IAN的前袢（AL）。在下颌骨种植体孔间区域植入种植体时，AL的存在很重要。这些解剖差异可通过锥形束CT（CBCT）进行评估，以确定其位置和确切位置。AL分为I型、II型和III型。I型为Y形解剖结构；II型为T形解剖结构；III型为Y形解剖结构，且切牙支比主支粗。
在本研究中，我们旨在分析沙特样本人群中IAN不同类型AL的发生率。
本研究是对利雅得国王沙特大学牙科学院种植牙科系2018年6月至2018年9月期间149例患者（86例女性和63例男性）CBCT图像记录的回顾性分析。参与研究的患者年龄范围为30至60岁。女性参与者的平均年龄为42.5±5.8岁，男性参与者的平均年龄为48.6±11.4岁。
右侧最常见的颏神经AL类型为I型（59.1%），其次是II型（27.5%）和III型（13.4%）。左侧最常见的颏神经AL类型为I型（61.7%），其次是II型（26.8%）和III型（11.4%）。
该研究结果鼓励在种植治疗计划中使用CBCT。我们还建议，专业人员在为孔间区域的手术制定计划时，必须对AL的存在进行分类并进行适当测量。
