Iwanaga Joe, Katafuchi Michitsuna, Matsushita Yuki, Kato Tomotaka, Horner Keith, Tubbs R Shane
Department of Neurosurgery, Tulane Center for Clinical Neurosciences, Tulane University School of Medicine, New Orleans, LA, USA; Dental and Oral Medical Center, Kurume University School of Medicine, Kurume, Fukuoka, Japan; Division of Gross and Clinical Anatomy, Department of Anatomy, Kurume University School of Medicine, Kurume, Fukuoka, Japan.
MK Periodontics and Implants, Tacoma/Kirkland, WA, USA.
Ann Anat. 2020 Nov;232:151580. doi: 10.1016/j.aanat.2020.151580. Epub 2020 Jul 17.
Previous studies of the mandibular canal (MC) have raised questions about the structure of its superior wall that have not been answered. The goal of this anatomical and radiological study was to investigate how CBCT imaging could predict the structure of the superior wall of the MC.
Twenty sides from ten dry mandibles derived from six females and four males were used for this study. The mandibles were examined with CBCT. The specimens were then prepared by the methods of our previous study and observed inferiorly. The inferior views were classified into four groups by gross observation of the surface of the superior wall of the MC: class I (trabecular pattern), class II (osteoporotic pattern), class III (dense/irregular pattern), and class IV (smooth pattern). Coronal section CBCT images were classed according to whether the superior wall of the MC was visible.
Class I was most common in dentulous sections in both genders, and class IV was most common class in edentulous sections in both genders. The superior wall was visible in 59.1% in dentulous and 84.9% in edentulous sections, and non-visible in the remainder.
Tooth presence and sex are important factors influencing the superior wall of the MC. When the superior wall cannot be seen on CBCT, it is more likely to belong to class II (osteoporotic) than other classes.
以往关于下颌管（MC）的研究对其上壁结构提出了一些尚未得到解答的问题。本解剖学和放射学研究的目的是探讨锥形束计算机断层扫描（CBCT）成像如何预测下颌管上壁的结构。
本研究使用了来自6名女性和4名男性的10具干燥下颌骨的20侧。对下颌骨进行CBCT检查。然后按照我们之前研究的方法制备标本并进行下方观察。通过对下颌管上壁表面的大体观察，将下方视图分为四组：I类（小梁型）、II类（骨质疏松型）、III类（致密/不规则型）和IV类（光滑型）。根据下颌管上壁是否可见，对冠状面CBCT图像进行分类。
I类在两性的有牙颌切片中最为常见，IV类在两性的无牙颌切片中最为常见。上壁在有牙颌切片中的可见率为59.1%，在无牙颌切片中的可见率为84.9%，其余部分不可见。
牙齿的存在和性别是影响下颌管上壁的重要因素。当在CBCT上看不到上壁时，它比其他类型更有可能属于II类（骨质疏松型）。
