IADR Abstract Archives
Understanding the Effect of Palatally Impacted Canines on Transversal Width of Dental Arch: Quadrant Analysis of Three Dimensional Data
Objectives: The aim of this study was to evaluate the transversal width of maxillary dental arch in patients with palatally impacted canines (PIC) on three dimensional images by using quadrant analysis.
Methods: The axial and coronal views of pretreatment cone beam computed tomography images of 18 patients with bilateral PIC (12 female,6 male; mean age 23.77±2.12 years) and 31 patients with unilateral PIC (19 female, 12 male; mean age 20.54±1.41 years) were evaluated. The transversal width of maxillary arch was measured at lateral incisor, premolar and molar region together with the angulation of the canines. The results were compared with a control group (n = 60; 38 female, 22 males; mean age 21.21±3.53 years) with normally erupted canines. A further quadrant analysis was performed by comparing the quadrants with PICs and normally erupted canines with each other. Statistical analysis was performed by one-way analysis of variance followed by Tukey test with Bonferroni adjustment (p<0.05).
Results: When compared to the control group, uni- and bi-lateral PICs showed significantly more horizontal angulation in relation to maxillary midline and nasal horizontal plane. Due to the variability in location of the PICs in unilaterally affected gorup (right or left), the canine angulations were found to be significantly less horizontal when compared to bilaterally PIC group. Inter-group comparisons displayed no difference with regard to transversal arch widths and total arch perimeter. On the other hand, the quadrant analysis showed that in quadrants with a PIC, the transversal width of the quadrant in premolar region was significantly narrower than in quadrants with normally erupted canines. Additionally, the quadrant's arch perimeter was significantly less when a PIC was present in the quadrant.
Conclusions: PICs are more horizontally angulated when compared to normally erupted canines. The presence of a PIC on a quadrant leads to a decrease in transversal arch width in premolar region. Particularly patients with unilateral PICs are advised to be analyzed further with quadrant analysis, since the variability of the position of the PIC may affect the results of traditional intergroup comparisons.
Methods: The axial and coronal views of pretreatment cone beam computed tomography images of 18 patients with bilateral PIC (12 female,6 male; mean age 23.77±2.12 years) and 31 patients with unilateral PIC (19 female, 12 male; mean age 20.54±1.41 years) were evaluated. The transversal width of maxillary arch was measured at lateral incisor, premolar and molar region together with the angulation of the canines. The results were compared with a control group (n = 60; 38 female, 22 males; mean age 21.21±3.53 years) with normally erupted canines. A further quadrant analysis was performed by comparing the quadrants with PICs and normally erupted canines with each other. Statistical analysis was performed by one-way analysis of variance followed by Tukey test with Bonferroni adjustment (p<0.05).
Results: When compared to the control group, uni- and bi-lateral PICs showed significantly more horizontal angulation in relation to maxillary midline and nasal horizontal plane. Due to the variability in location of the PICs in unilaterally affected gorup (right or left), the canine angulations were found to be significantly less horizontal when compared to bilaterally PIC group. Inter-group comparisons displayed no difference with regard to transversal arch widths and total arch perimeter. On the other hand, the quadrant analysis showed that in quadrants with a PIC, the transversal width of the quadrant in premolar region was significantly narrower than in quadrants with normally erupted canines. Additionally, the quadrant's arch perimeter was significantly less when a PIC was present in the quadrant.
Conclusions: PICs are more horizontally angulated when compared to normally erupted canines. The presence of a PIC on a quadrant leads to a decrease in transversal arch width in premolar region. Particularly patients with unilateral PICs are advised to be analyzed further with quadrant analysis, since the variability of the position of the PIC may affect the results of traditional intergroup comparisons.