Diagnosing Tooth Root Resorption with Cone Beam Computed Tomography After Six Months of Fixed Appliance Orthodontic Treatment and Its Relationship with Risk Factors

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Fatemeh Zahedipour
Susan Rahimian
Faeze Mirjalili
Anahita Dehghani Soltani
Berahman Sabzevari


Objective: This study was conducted with the aim of diagnosing tooth root resorption with cone beam computed tomography after six months of orthodontic treatment with a fixed appliance and its relationship with risk factors.

Materials and methods: 121 patients (11-58 years old) with class I malocclusion and irregular teeth who were treated with fixed appliance and premolar extraction method participated in this research. Patients were evaluated using CBCT before and 6 months after active orthodontic treatment. This evaluation included all teeth from the right first molar to the left first molar in both jaws. Malmgren's index was used to evaluate root analysis. Irregularity of the root contour (grade 1 root analysis) was seen in most teeth before active treatment, and therefore in this study, root analysis related to orthodontic treatment, grade 2 analyses (minor analysis or root analysis to the extent of < 2 mm) or higher grades were considered.

Results: Minor resorption was observed in 20% of patients and severe root resorption (grade 3 resorption or root resorption <2 mm) was observed in 2 patients. Root resorption was more frequent in the upper jaw, especially in the incisors. The root because analysis did not show a statistically significant correlation with the investigated risk factors.

Conclusion: Six months after active orthodontic treatment, clinically significant root resorption was detected in 9% of patients. In other words, in 91% of patients, evaluation by CBCT did not show significant information. The factors that were considered as possible risk factors in this study did not show a significant effect on the amount of root resorption six months after active orthodontic treatment.

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