IADR Abstract Archives
Impacted canine traction length assessment using measurements and 3D angle
Objectives: Although cone beam CT provides information about the canine position in space (3D), usually only measurements in axial, coronal and sagittal planes were used to assess the impacted canine’s three-dimensional position.
Our null hypothesis was that there is no relationship between a three-dimensional position of impacted canine and the orthodontic traction length.
Methods: The database (interval from 2008-2012) of CBCT scans of a multidisciplinary clinic was checked on the subject of impacted canines. One hundred twenty-eight impacted canines (in 105 patients) were retrieved from the database. The patient’s records were revised and the patients who came for the second consultation were included in the study (111 canines, 92 patients). The scans were uploaded in the freeware program Osirix, allowing assessment of the canine in the coordinate system. A formula to calculate the three-dimensional angle between occlusal plane and impacted canine was created. Linear and angular measurements were assessed on axial, sagittal and coronal planes. Length of traction was measured from the first traction appointment until impacted canine was in the dental arch, not counting all the rotation if needed.
Normal distribution was checked and associations between variables were analyzed by Pearson’s correlation coefficients, and linear regression analysis was used to identify factors that had a possible influence on the traction length.
Results: Statistically significant correlations (p<0.05) were found between all linear and angular measurements, 3D angle and impacted canine traction length into the dental arch.
Impacted canine crown tip distance to the midline determined 34% association with the orthodontic traction length.
Conclusions: Results suggest that the distance to the midline had a significant influence on the duration of the orthodontic traction.
Our null hypothesis was that there is no relationship between a three-dimensional position of impacted canine and the orthodontic traction length.
Methods: The database (interval from 2008-2012) of CBCT scans of a multidisciplinary clinic was checked on the subject of impacted canines. One hundred twenty-eight impacted canines (in 105 patients) were retrieved from the database. The patient’s records were revised and the patients who came for the second consultation were included in the study (111 canines, 92 patients). The scans were uploaded in the freeware program Osirix, allowing assessment of the canine in the coordinate system. A formula to calculate the three-dimensional angle between occlusal plane and impacted canine was created. Linear and angular measurements were assessed on axial, sagittal and coronal planes. Length of traction was measured from the first traction appointment until impacted canine was in the dental arch, not counting all the rotation if needed.
Normal distribution was checked and associations between variables were analyzed by Pearson’s correlation coefficients, and linear regression analysis was used to identify factors that had a possible influence on the traction length.
Results: Statistically significant correlations (p<0.05) were found between all linear and angular measurements, 3D angle and impacted canine traction length into the dental arch.
Impacted canine crown tip distance to the midline determined 34% association with the orthodontic traction length.
Conclusions: Results suggest that the distance to the midline had a significant influence on the duration of the orthodontic traction.
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