Department of Orthodontics and Dentofacial Orthopedics, School of Dental Medicine, University of Bern, Freiburgstrasse 7, Bern, Switzerland.
Eur J Orthod. 2013 Aug;35(4):529-38. doi: 10.1093/ejo/cjs037. Epub 2012 Jul 24.
The study analyses the location of impacted maxillary canines and factors influencing root resorptions of adjacent teeth using cone-beam computed tomography (CBCT). In addition, the interrater reliability between observers of two different dental specialties for radiographic parameters will be evaluated. CBCT images of patients who were referred for radiographic localization of impacted maxillary canines and/or suspicion of root resorptions of adjacent teeth were included. The study analysed the exact three-dimensional location of the impacted canines in the anterior maxilla, frequency and extent of root resorptions, and potential influencing factors. To assess interrater agreement, Cohen's correlation parameters were calculated. This study comprises 113 patients with CBCT scans, and 134 impacted canines were analysed retrospectively. In the patients evaluated, 69 impacted canines were located palatally (51.49 per cent), 41 labially (30.60 per cent), and 24 (17.91 per cent) in the middle of the alveolar process. Root resorptions were found in 34 lateral incisors (25.37 per cent), 7 central incisors (5.22 per cent), 6 first premolars (4.48 per cent), and 1 second premolar (0.75 per cent). There was a significant correlation between root resorptions on adjacent teeth and localization of the impacted canine in relation to the bone, as well as vertical localization of the canine. Interrater agreement showed values of 0.546-0.877. CBCT provides accurate information about location of the impacted canine and prevalence and degree of root resorption of neighbouring teeth with high interrater correlation. This information is of great importance for surgeons and orthodontists for accurate diagnostics and interdisciplinary treatment planning.
本研究使用锥形束计算机断层扫描（CBCT）分析上颌埋伏尖牙的位置及邻牙牙根吸收的影响因素。此外，还将评估两位不同牙科专业观察者对影像学参数的组内一致性。纳入因上颌埋伏尖牙影像学定位和/或怀疑邻牙牙根吸收而转诊的患者的 CBCT 图像。本研究分析了上颌前牙埋伏尖牙的确切三维位置、牙根吸收的频率和程度，以及潜在的影响因素。为了评估组内一致性，计算了 Cohen 相关系数。本研究共纳入 113 例患者的 CBCT 扫描结果，共分析了 134 颗埋伏尖牙。在评估的患者中，69 颗埋伏尖牙位于腭侧（51.49%）、41 颗位于唇侧（30.60%）、24 颗位于牙槽突中部（17.91%）。34 颗侧切牙（25.37%）、7 颗中切牙（5.22%）、6 颗第一前磨牙（4.48%）和 1 颗第二前磨牙（0.75%）发现牙根吸收。邻牙牙根吸收与埋伏尖牙与骨的关系定位以及尖牙的垂直定位之间存在显著相关性。组内一致性显示值为 0.546-0.877。CBCT 可提供有关埋伏尖牙位置以及邻近牙齿牙根吸收的发生率和程度的准确信息，且观察者间相关性较高。这些信息对于外科医生和正畸医生进行准确的诊断和跨学科治疗计划非常重要。
