Evaluation of Biological and Orthodontic Factors in the External Root Resorption Induced by Orthodontics
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Abstract
Introduction: It is important for orthodontists to know that External Root Resorption (ERR) is not only related to orthodontic forces, but also to other biological factors, because their origin is multifactorial. Objective: to evaluate the biological and orthodontic factors on external root resorption induced by orthodontic treatment. Materials and methods: Longitudinal study with a prospective design in 19 patients (11 men and 8 women) with an initial average age of 22±7.5 years, with complete root formation of the upper and lower incisor teeth and without external root resorption. The biological and orthodontic factors evaluated were: Age, sex, crowding, overjet, overbite, incisor inclination, dental malocclusion, skeletal sagittal classification, ERR degree, root morphology and treatment technique (conventional and self-ligating). The Levander and Malmgren index was applied at six months of treatment, using periapical digital radiographs. Results: After 6 months of orthodontic treatment, 56.6% of the teeth did not present ERR and 43.4% presented ERR grade 1, with tooth 31 having the lowest ERR with 26.3%; there was no statistically significant association between biological and orthodontic factors with the ERR. Conclusion: None of the biological and orthodontic factors studied was associated with the ERR induced by orthodontic treatment during the first six months.
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