Mossaz Jessica, Kloukos Dimitrios, Pandis Nikolaos, Suter Valerie G A, Katsaros Christos, Bornstein Michael M
*Department of Orthodontics and Dentofacial Orthopedics and.
**Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern, Switzerland.
Eur J Orthod. 2014 Dec;36(6):708-18. doi: 10.1093/ejo/cjt101. Epub 2014 Jan 2.
To evaluate the location and morphologic characteristics of supernumerary teeth and to assess the frequency and extent of root resorption of adjacent teeth using cone beam computed tomography (CBCT).
CBCT scans of 82 patients with supernumerary teeth in the maxilla and mandible were evaluated by two orthodontists independently. Data regarding the type, shape, and three-dimensional (3D) location of the supernumeraries including the frequency and extent of root resorption of adjacent teeth were recorded and evaluated for possible associations.
The study comprised a total of 101 supernumerary teeth. Most of the patients (80.5 per cent) exhibited one single supernumerary tooth, while 15.8 per cent had two and 3.7 per cent had three supernumeraries. Males were affected more than females with a ratio of 1.65:1. Mesiodentes were the most frequently diagnosed type of supernumerary teeth (48.52 per cent), followed by supernumerary premolars (23.76 per cent) and lateral incisors (18.81 per cent). Supernumeraries were most commonly conical in shape (42.6 per cent) with a normal or inclined vertical position (61.4 per cent). Root resorption of adjacent teeth was detected for 22.8 per cent of the supernumerary teeth, most frequently for supernumerary premolars. There was a significant association between root resorption of adjacent teeth and type and shape of tooth. Interrater agreement for the measurements performed showed kappa values ranging from 0.55 to 1 with a kappa value of 1 for type and shape of the supernumerary teeth.
CBCT provides 3D information about location and shape of supernumerary teeth as well as prevalence and degree of root resorption of neighbouring teeth with moderate to high interrater correlation.
使用锥形束计算机断层扫描（CBCT）评估多生牙的位置和形态特征，并评估相邻牙齿牙根吸收的频率和程度。
由两位正畸医生独立评估82例上颌和下颌有多生牙患者的CBCT扫描图像。记录多生牙的类型、形状和三维（3D）位置等数据，包括相邻牙齿牙根吸收的频率和程度，并评估可能的相关性。
该研究共纳入101颗多生牙。大多数患者（80.5%）有一颗多生牙，15.8%的患者有两颗，3.7%的患者有三颗多生牙。男性受影响的比例高于女性，比例为1.65:1。正中多生牙是最常诊断出的多生牙类型（48.52%），其次是多生前磨牙（23.76%）和多生侧切牙（18.81%）。多生牙最常见的形状是锥形（42.6%），垂直位置正常或倾斜（61.4%）。22.8%的多生牙检测到相邻牙齿牙根吸收，最常见于多生前磨牙。相邻牙齿牙根吸收与牙齿类型和形状之间存在显著相关性。测量结果的评分者间一致性显示，kappa值范围为0.55至1，多生牙类型和形状的kappa值为1。
CBCT提供了多生牙位置和形状的三维信息，以及相邻牙齿牙根吸收的发生率和程度，评分者间相关性为中度至高。
