Abstract
Aim: Through the use of CBCT images, many unidentified features of impacted canines can be easily resolved. The potential collision of impacted maxillary canines and adjacent teeth could lead to root resorption (RR). The aim of this study is to examine the prevalence, location and severity of RR on adjacent teeth caused by impacted maxillary canines and the association between the adjacent teeth and the features of maxillary impacted canines on CBCT. Methods: This study examined 89 subjects with 108 maxillary impacted canines, having had no previous orthodontic treatment (mean age: 18.3 ± 4.1 years). The following impacted-canine-related parameters were analyzed on the CBCT images: location; RR levels on adjacent teeth; occlusal line and midline distances of impacted canines; and the angulations of impacted canines to the midline, lateral incisor and occlusal line. Logistic regression was used to evaluate the association between RR and the measured parameters on CBCT. Results: In this study, we found that the majority of our patients with impacted maxillary canines were female (62.5%). Of the total 108 maxillary impacted canines, 60.2% resorbed the adjacent teeth of the affected quadrants. Lateral incisors were the most affected (34.3%). The mean age of subjects with RR was 16.7 ± 3.5 years. The frequency of RR was statistically significantly higher in female subjects (40.4%). Slight RR was the most frequent (30.5%) and the highest incidence noted at the apical third of the root (29.6%). Regarding the impacted maxillary canine angulation to the midline and adjacent tooth, higher values of angulation caused severe forms of RR (p < 0.05). Conclusion: The sensitivity of CBCT allows for the accurate diagnosis of the location and the degree of RR, alongside the angulation and distance of impacted canines to adjacent teeth. The association between the linear and angular features of the impacted maxillary canines and RR was confirmed.
Highlights
The maxillary canines are the second most frequently impacted teeth after the third molars, with general prevalence rates from 1 to 3% [1,2]
The study was carried out by analyzing the cone‐beam computed tomography (CBCT) of the maxilla, which the subjects underwent according to our instructions, only for diagnostic purposes and in order to plan upcoming orthodontic treatment
The following parameters were measured on CBCT: (1) Type of impaction; (2) Sagittal location using sagittal and coronal CBCT scans (Figure 1a); (3) Vertical location of the cusp tip in relation to the long axis of the adjacent tooth, which was assigned to one of five categories: subdi‐ vided into coronal, cervical third, middle third, apical third of the root, or suprapical; (4) Horizontal position of the canine cusp tip; the canine was observed to overlap with adjacent teeth using sagittal or coronal CBCT scans
Summary
The maxillary canines are the second most frequently impacted teeth after the third molars, with general prevalence rates from 1 to 3% [1,2]. In comparison with the third molar, the maxillary canines are located in a highly demanding area, both in function and aesthetics [3]. The potential collision of impacted maxillary canines and adjacent teeth could lead to root resorption (RR). Due to a general lack of symptoms, the RR of permanent teeth caused by impacted canine collision has a tendency to be misdiagnosed [4]. The techniques used to detect maxillary impacted canines have improved with new advances in medical imaging technologies. Through the use of CBCT images, many unidentified features of impacted canines can be resolved [5,6,7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
