Predictors of root resorption in lateral incisors adjacent to maxillary impacted canines in CBCT images: A retrospective study

Abstract

Background: Diagnosis and early treatment of impacted teeth are crucial for preventing their pathological complications such as root resorption. This study aimed to assess the predictive factors of root resorption in lateral incisors adjacent to impacted maxillary canines using cone-beam computed tomography. Methods: In this retrospective descriptive-analytic study, 150 samples of impacted canines from 138 CBCT images were collected from the files of 12–35-year-old patients. The association between the severity and location of root resorption in lateral incisors adjacent to impacted maxillary canines and the patients’ age, sex, impacted canine’s angulation, position and follicle size was evaluated. Position and angulation of the impacted teeth were measured using the OnDemand3Dä software. Kruskal Wallis test, Fisher’s exact test, Mann-Whitney test, Kolmogorov-Smirnov test, Spearman’s rank correlation coefficient and multinomial logistic regression were used for data analysis.Results: The probability of resorption in the middle-third of the roots of lateral incisors decreased by 20% with each millimeter of increase in the distance between the impacted canines’ cusp tip from the occlusal plane (P=0.009). There was a significant association between the severity of lateral incisors’ root resorption and sex; root resorption was significantly more severe in females (P=0.029). No significant differences were observed between the lateral incisors’ root resorption and age, sagittal and transverse positions of the impacted canine, its follicle size, and the angle between the long axis of canines with the midline, occlusal plane and the long axis of lateral incisors (P>0.05).Conclusion: Among the evaluated variables, the vertical position of the impacted canine influenced the location of the lateral incisors’ root resorption. The severity of root resorption was higher in females.