Department of Orthodontics, National Health Insurance Service Ilsan Hospital, Goyang, 10444, Republic of Korea.
Department of Orthodontics, Institute of Craniofacial Deformity, Yonsei University College of Dentistry, Seoul, 03722, Republic of Korea.
Sci Rep. 2022 Nov 10;12(1):19183. doi: 10.1038/s41598-022-23232-7.
This cross-sectional study aimed to classify the radiographical characteristics of impacted maxillary canines that were surgically exposed following orthodontic traction and to find out which factor is most closely related to traction duration. This study enrolled 74 patients with 87 maxillary canines. Cone-beam computed tomography images, panoramic radiographs, and medical records were analyzed. Cystic-appearing lesion and resorption of adjacent roots were observed in 26.4% and 23.0% of cases, respectively. Impacted maxillary canines were mostly distributed in the lateral incisor area. The mean (± standard deviation) traction duration for the 47 teeth that met the study criteria was 13.9 (± 8.9) months. Impacted maxillary canines treated with surgical exposure and orthodontic traction showed increasing possibilities of palatal impaction and resorption of the adjacent root as they were located mesially (p < 0.05). The distance from the occlusal plane to the impacted maxillary canine showed the strongest positive correlation with traction duration (r = 0.519, p < 0.01). When establishing treatment plans for patients with impacted maxillary canines, distance from the occlusal plane to the impacted canines, rather than the angle, should be considered in predicting the duration of treatment.
本横断面研究旨在对正畸牵引术后暴露的上颌埋伏尖牙的影像学特征进行分类，并找出与牵引时间最密切相关的因素。本研究纳入了 74 例 87 颗上颌埋伏尖牙的患者。对锥形束 CT 图像、全景片和病历进行了分析。结果显示，26.4%的病例存在囊性病变，23.0%的病例存在邻牙根吸收。上颌埋伏尖牙多分布于侧切牙区。符合研究标准的 47 颗牙齿的平均（±标准偏差）牵引时间为 13.9（±8.9）个月。上颌埋伏尖牙近中萌出时，腭向埋伏和邻牙根吸收的可能性增加（p<0.05）。从牙合平面到埋伏尖牙的距离与牵引时间呈最强正相关（r=0.519，p<0.01）。在为上颌埋伏尖牙患者制定治疗计划时，应考虑从牙合平面到埋伏牙的距离，而不是角度，以预测治疗时间。
