Fontolliet Marta, Bornstein Michael M, von Arx Thomas
Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
Oral and Maxillofacial Radiology, Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China.
Surg Radiol Anat. 2019 Feb;41(2):169-179. doi: 10.1007/s00276-018-2108-z. Epub 2018 Oct 17.
To analyze morphological characteristics and dimensions of the infraorbital canal-groove complex using cone beam computed tomography (CBCT), and to evaluate its relationship with adjacent anatomical structures.
This retrospective study included CBCT scans of 100 patients taken between January and May 2014. Linear measurements of the infraorbital canal (IOC), the infraorbital groove (IOG) and the infraorbital canal-groove complex (IOC/G) were performed. Morphological variants of the IOC related to the maxillary sinus were classified into three types depending on the extent of protrusion of the canal into the sinus. Angles between the IOC and specific landmarks were measured to determine the direction of the IOC relative to the axial (A-ant) and sagittal (A-horiz) planes.
A total of 127 IOCs were analyzed. The mean length of the IOC/G was 29 ± 3.0 mm. This value comprised the mean distances of the IOC (24.4 ± 2.9 mm) and the IOG (4.6 ± 1.7 mm). For the different types of IOC morphology, Type 1 (IOC embedded in maxillary sinus roof) was the most common (n = 87, 68.5%). The mean angles of A-ant and A-horiz measured 48.9° ± 7.5° and 20.3° ± 7.9°, respectively.
Knowledge of the IOC/G morphology and its variants is important for the prevention of infraorbital nerve injury due to anesthesia or surgical interventions in this area. The presented data of anatomical characteristics of the IOC/G could be helpful for the planning of surgeries in the maxillary region by means of CBCT imaging.
使用锥形束计算机断层扫描（CBCT）分析眶下管-沟复合体的形态特征和尺寸，并评估其与相邻解剖结构的关系。
这项回顾性研究纳入了2014年1月至5月期间对100例患者进行的CBCT扫描。对眶下管（IOC）、眶下沟（IOG）和眶下管-沟复合体（IOC/G）进行线性测量。根据管突入窦内的程度，将与上颌窦相关的IOC形态变异分为三种类型。测量IOC与特定标志点之间的角度，以确定IOC相对于轴向（A-ant）和矢状（A-horiz）平面的方向。
共分析了127条IOC。IOC/G的平均长度为29±3.0mm。该值包括IOC（24.4±2.9mm）和IOG（4.6±1.7mm）的平均距离。对于不同类型的IOC形态，1型（IOC嵌入上颌窦顶）最为常见（n = 87，68.5%）。A-ant和A-horiz的平均角度分别为48.9°±7.5°和20.3°±7.9°。
了解IOC/G的形态及其变异对于预防该区域麻醉或手术干预导致的眶下神经损伤很重要。所呈现的IOC/G解剖特征数据可能有助于通过CBCT成像对上颌区域手术进行规划。
