Department of Oral Medicine and Radiology, Faculty of Dental Sciences, Shree Guru Gobind Singh Tricentenary (SGT) University, Gurugram, Haryana, India, 122001.
Department of Oral Medicine and Radiology, RUHS College of Dental Sciences and Hospital, Jaipur, India.
Oral Radiol. 2021 Jul;37(3):355-365. doi: 10.1007/s11282-020-00461-y. Epub 2020 Jun 30.
The Gubernaculum Dentis (GD) is an anatomical structure connecting the dental follicle of the permanent tooth to the overlying gingiva. It is composed of Gubernacular cord (GCo) and a surrounding bony canal called as Gubernacular canal (GC) or Gubernacular Tract (GT). GD is a physiologic structure that has claimed to play some role in the eruption of teeth. GCo is a histologic structure, however, the surrounding GT can be identified radiographically. But due to its infinitesimal appearance, its differentiation with normal bone marrow spaces on conventional radiographs is extremely difficult and is the reason for its sporadic reference in the oral radiology literature. The advent of advanced imaging modalities such as Cone Beam Computed Tomography (CBCT) has led to its distinct identification in the recent studies not only in the normal erupting teeth but in teeth with altered eruption pattern, impacted teeth, supernumerary teeth, odontogenic cysts and tumors as well. The identification of GT on CBCT is usually an incidental finding and because of its physiologic nature, the imaging characteristics of GT have not been studied extensively. This pictorial review aims to demonstrate the imaging characteristics of GT in diverse relations with the normal teeth, impacted teeth, supernumerary teeth, odontomas and odontogenic cysts and tumors. This will help in understanding the various presentations of GT and will serve as a teaching guide for oral and maxillofacial radiologists for their easy identification and their possible causal association with various eruptive pathologies.
牙囊悬韧带（Gubernaculum Dentis，GD）是一种连接恒牙牙囊和覆盖其上的牙龈的解剖结构。它由悬韧带纤维（Gubernacular cord，GCo）和周围的骨性管道组成，称为悬韧带管（Gubernacular canal，GC）或悬韧带道（Gubernacular tract，GT）。GD 是一种生理结构，据称在牙齿萌出过程中发挥作用。GCo 是一种组织学结构，而周围的 GT 可以在放射学上识别。但由于其微小的外观，在常规放射照片上与正常骨髓腔的区分极其困难，这也是其在口腔放射学文献中偶尔被提及的原因。随着先进成像方式（如锥形束 CT）的出现，其在最近的研究中不仅在正常萌出的牙齿中，而且在萌出模式改变的牙齿、阻生牙、多生牙、牙源性囊肿和肿瘤中都能得到明确的识别。GT 在 CBCT 上的识别通常是偶然发现，由于其生理性，GT 的成像特征尚未得到广泛研究。本影像学综述旨在展示 GT 在与正常牙齿、阻生牙、多生牙、牙瘤和牙源性囊肿和肿瘤的不同关系中的影像学特征。这将有助于理解 GT 的各种表现，并为口腔颌面放射科医生提供教学指南，以便于识别并了解其与各种萌出性病变的可能因果关系。
