Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, University of Ondokuz Mayis, Atakum, 55139, Samsun, Turkey.
Oral Radiol. 2023 Apr;39(2):292-300. doi: 10.1007/s11282-022-00636-9. Epub 2022 Jul 30.
The aim of this study was to evaluate the prevalence and visualization of supernumerary teeth (ST) and imaging characteristics of their gubernacular tract (GT) using cone beam computed tomography (CBCT).
Presence and visualization of ST were retrospectively evaluated using 960 CBCT images. The imaging characteristics of GT were analyzed to determine various presentations of GT according to type, shape, and orientation of ST.
ST were radiographically detected in 93 patients, for a prevalence of 9.7%. Premolar shaped ST were more common (p = 0.003). GT was detected in 104 (77.2%) of impacted ST and mostly found straight in shape (49.0%). It was most frequently observed in peridens (n = 51, 49.0%) followed by mesiodens (n = 41, 39.4%) and more frequently seen in premolar-like ST (n = 44, 42.3%). The mean length of the GT in mandible was 2.8 mm, the mean length of the GT in maxilla was 1.0 mm (p < 0.001). The mean angle of the GT in mandible was 17.0, and the mean angle of the GT in maxilla was 43.0 (p = 0.004).
CBCT can be used for evaluations in dental practice to provide comprehensive information about ST and their GT characteristics. Clinicians should be able to identify the characteristics of GTs on CBCT for dental treatments, especially traction and extraction of ST.
本研究旨在通过锥形束 CT（CBCT）评估额外牙（ST）的发生率和可视化以及其系带管（GT）的影像学特征。
使用 960 个 CBCT 图像回顾性评估 ST 的存在和可视化。分析 GT 的影像学特征，根据 ST 的类型、形状和方向确定 GT 的各种表现。
93 例患者的 ST 经影像学检测发现，发生率为 9.7%。前磨牙形状的 ST 更为常见（p=0.003）。104 颗（77.2%）萌出的 ST 检测到 GT，其形状多为直形。GT 最常见于近中牙（n=51，49.0%），其次是中切牙（n=41，39.4%），在前磨牙样 ST 中更常见（n=44，42.3%）。下颌 GT 的平均长度为 2.8mm，上颌 GT 的平均长度为 1.0mm（p<0.001）。下颌 GT 的平均角度为 17.0°，上颌 GT 的平均角度为 43.0°（p=0.004）。
CBCT 可用于临床评估，提供有关 ST 和其 GT 特征的全面信息。临床医生应能够在 CBCT 上识别 GT 的特征，以便进行牙科治疗，特别是 ST 的牵引和拔除。
