Predictive factors associated with adjacent teeth root resorption of palatally impacted canines in Arabian population: a cone‑beam computed tomography analysis
2022-01-03
Hanaa A. Al‑Kyssi, Naela M. Al‑Mogahed, Zainab M. Altawili, Faiz N. Dahan, Abeer A. Almashraqi, Khalid Aldhorae, Maged S. Alhammadi
BMC Oral Health
ABSTRACT
Background: This study aimed to evaluate three-dimensionally the factors associated with adjacent teeth root resorption of palatally impacted canines.
Methods: In this retrospective cross-sectional study, one-hundred and fourteen cone beam computed tomography scans with palatally impacted maxillary canines were evaluated for the presence of adjacent root resorption. Seven
parameters were analyzed: alignment of maxillary incisors, presence of deciduous canines, first premolars’ roots configuration,
impacted canines rotation, angulation of impacted canine to the midline, contact relationship, and area
of contact with adjacent teeth. The association between dependent and independent qualitative and quantitative
variables was analyzed using chi-square and independent student’s t-test, respectively. The multivariate analysis was
performed using regression analysis. The significant value was set at P ≤ 0.05.
Results: The overall incidence of vertical, horizontal impaction and adjacent root resorption were 92, 8 and 77.2%,
respectively. The apical third was the most involved area (57%); resorption of a single tooth was found in 21.9% of the
total sample. The most common resorbed teeth were lateral first premolars (24.6%), followed by central lateral incisors
(20.2%), and lateral incisors (15.8%) of the total sample. The severity of resorption was highest in grade I (31.5%)
and lowest in grade III (7.6%). Three variables showed significant differences between resorption and non-resorption
groups namely; canine rotation (P < 0.013), contact relationship (P < 0.001), and area of contact with adjacent teeth
(P < 0.001). Regression analysis revealed an association between adjacent root resorption and permanent canine rotation,
adjacent premolars’ roots configuration, contact relationship, and area of contact (P < 0.05).
Conclusion: Two-thirds of impacted maxillary canines showed a form of root resorption. The most commonly
resorbed tooth was the lateral incisors while the least affected one was the central incisors with apical one-third being
of the highest risk. The predisposing factors including the canine rotation, premolar with separated roots, contact
relationship, and area of contact with adjacent teeth are to be considered for any interceptive treatment.