Ucar Faruk I, Celebi Ahmet A, Tan Enes, Topcuoğlu Tolga, Sekerci Ahmet Ercan
Department of Orthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey.
Department of Orthodontics, Faculty of Dentistry, University of Zirve, Gaziantep, Turkey.
J Orofac Orthop. 2017 May;78(3):233-240. doi: 10.1007/s00056-016-0077-6.
The aim of this study was to analyze the amount of root resorption of maxillary lateral incisors by relating the position, location, and angulation of the impacted canine using cone-beam computed tomography (CBCT).
The study sample consisted of panoramic and CBCT radiographs of 46 patients with a unilateral impacted canine (16 males and 30 females; mean age: 19.53 ± 6.66 and 19.44 ± 5.77 years, respectively). Sector location and canine angulation were measured in panoramics. All tomographs were obtained using CBCT (NewTom 5G, QR, Verona, Italy) and three-dimensional (3D) reconstructions of the maxillary laterals assessed by Mimics 14.01 image analysis software.
Upper lateral incisor volume was smaller on the impacted side (401.95 ± 83.69 mm) than on the nonimpacted side (433.54 ± 92.6 mm, P < 0.05). There were no significant differences of lateral root resorption volume when comparing the impacted canines being on the labial or palatal sides (P > 0.05), but impacted canine angulation was significantly steeper on the labial side (70.85°) than on the palatal side (46.09°, P < 0.05). The volume of root resorption of laterals when comparing the various positions of the canine in different sectors or canine angulation in 30 intervals was not statistically significantly different (P > 0.05).
The impacted canines caused root resorption of lateral incisors. The angulation of the canine was steeper on the labial side than on the palatal side but root resorption of adjacent laterals was not different. There were no statistically significant differences in the amount of root resorption of the laterals when the canine was evaluated according to localization and angulation.
本研究旨在通过锥形束计算机断层扫描（CBCT），分析阻生尖牙的位置、部位及角度与上颌侧切牙根吸收量之间的关系。
研究样本包括46例单侧阻生尖牙患者的全景片和CBCT片（男性16例，女性30例；平均年龄分别为19.53±6.66岁和19.44±5.77岁）。在全景片中测量扇形部位及尖牙角度。所有断层扫描均采用CBCT（NewTom 5G，QR，意大利维罗纳）获取，并通过Mimics 14.01图像分析软件对上颌侧切牙进行三维（3D）重建。
患侧上颌侧切牙体积（401.95±83.69mm）小于健侧（433.54±92.6mm，P<0.05）。比较阻生尖牙位于唇侧或腭侧时，侧切牙根吸收体积无显著差异（P>0.05），但唇侧阻生尖牙角度（70.85°）明显大于腭侧（46.09°，P<0.05）。比较尖牙在不同扇形区域的不同位置或30个角度间隔的尖牙角度时，侧切牙根吸收体积无统计学显著差异（P>0.05）。
阻生尖牙导致侧切牙根吸收。尖牙唇侧角度大于腭侧，但相邻侧切牙的根吸收无差异。根据位置和角度评估尖牙时，侧切牙根吸收量无统计学显著差异。
