The University of Queensland, School of Dentistry, and Queensland Diagnostic Imaging, Brisbane Private Hospital, Queensland, Australia.
Dentomaxillofac Radiol. 2011 Jan;40(1):47-52. doi: 10.1259/dmfr/16606307.
Mandibular para-radicular third molar radiolucencies (MPRs) were first described in 2004 by Bohay et al (Bohay RN, Mara TW, Sawula KW, Lapointe HJ. A preliminary radiographic study of mandibular para-radicular third molar radiolucencies. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2004; 98: 97-101) as a well-defined oval radiolucency surrounded by a thin sclerotic border located immediately distal to the mandibular third molar roots. Bohay et al's analysis was undertaken using panoramic radiographs. The purpose of this study was to confirm Bohay et al's findings on panoramic radiographs and to identify and document the appearance of MPRs on cross-sectional CT.
Panoramic films and CT images of the lower third molar regions from 143 patients were reviewed.
MPR was identified on panoramic film in 12 patients with a total of 14 MPRs. A number of factors were recorded from panoramic films and CT.
This study confirmed the findings of Bohay et al and concluded that the relative lucent appearance on panoramic radiographs can be explained by the presence of one or a combination of factors: (i) an area of decreased density in trabecular bone, (ii) thinning of the inner surface of the buccal cortex, (iii) thinning of the inner surface of the lingual cortex or (iv) a depression in the external surface of the lingual cortex.
下颌后牙根旁第三磨牙透亮区（MPR）于 2004 年由 Bohay 等人首次描述（Bohay RN、Mara TW、Sawula KW、Lapointe HJ. 下颌后牙根旁第三磨牙透亮区的初步放射学研究。口腔颌面外科口腔医学口腔病理学口腔放射学与牙髓学 2004；98: 97-101），表现为一个边界清晰的椭圆形透亮区，周围有一个薄的硬化边界，位于下颌第三磨牙根部的直接远中。Bohay 等人的分析是使用全景片进行的。本研究的目的是确认 Bohay 等人在全景片上的发现，并确定和记录 MPR 在横断 CT 上的表现。
对 143 例患者的下颌第三磨牙区域的全景片和 CT 图像进行了回顾。
在 12 名患者的全景片中发现了 MPR，共有 14 个 MPR。从全景片中记录了多个因素，并在 CT 上进行了记录。
本研究证实了 Bohay 等人的发现，并得出结论，全景片上相对透亮的表现可以用以下一种或多种因素来解释：（i）骨小梁密度降低区，（ii）颊侧皮质内表面变薄，（iii）舌侧皮质内表面变薄，或（iv）舌侧皮质外表面凹陷。
