Clinical study of the positioning of impacted maxillary canines with cone-beam computed tomography

FENG Jing; LI Zhi-min; WANG Bo; YAN Hong-jing; SONG Zi-qi; JU Hao; GONG Bai-juan

doi:10.19538/j.kq.2018.02.012

Abstract：Objective To evaluate the position of maxillary impacted canines and resorption of neighboring incisors with cone beam computed tomography (CBCT).Methods Impacted maxillary canines in sixty-seven patients were selected and scanned by the Planmeca ProMax 3D at Stomatological Hospital of Jilin University from Dec.2015 to Jan.2017.The three-dimensional images were obtained by Invivo 5.4.5 software.Each impacted canine was positioned and the root resorption of adjacent incisors was observed in sagittal,coronal and axial views.Results In sagittal plane view,except 10 horizontal impacted canines (12.0％) and 1 inverted impacted canine (1.2％),33.7％ of impactions were labial,30.1％ were palatal,and 22.9％ were middle.In coronal plane view,12.0％ of the cusp tips of maxillary impacted canines were near the crown of the adjacent incisor,42.2％ were near cervical third of the root of the adjacent incisor,24.1％ were near middle third of the root of the adjacent incisor,9.6％ were near apical third of the root of the adjacent incisor,and 12.0％ were near the root tip of the adjacent incisor.In axial plane view,65.1％ of impactions were mesial,12.0％ of impactions were distal,and 9.6％ were middle.About 17.9％ lateral incisors had root resorption,and 9.7％ central incisors (13) had root resorption,the difference being statistical (P ＜ 0.05).Conclusion CBCT is a better way in the diagnosis and analysis of the position and root resorption of maxillary impacted canines,which provides guidance to the treatment.