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KJO Korean Journal of Orthodontics

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eISSN 2005-372X
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Korean J Orthod

Published online April 1, 2021

Copyright © The Korean Association of Orthodontists.

EXTERNAL APICAL ROOT RESORPTION 6 MONTHS AFTER INITIATION OF ORTHODONTIC TREATMENT WITH FIXED APPLIANCE AND ORTHODONTIC ALIGNERS: RANDOMIZED CLINICAL TRIAL

Katia Cristina Toyokawa-Sperandio (First Author)
Former graduate student – UNOPAR University of North Paraná
Ana Cláudia de Castro Ferreira Conti
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Thais Maria Freire Fernandes
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Renata Rodrigues de Almeida-Pedrin
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Marcio Rodrigues de Almeida
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Paula Vanessa Pedron Oltramari (Corresponding author)
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Rua do US Open, 272 – Q10, L12
Zip Code: 86058-138 Londrina/PR Brasil
Phone number: +55 43 991344499
email address: pvoltramari@hotmail.com

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: To compare the magnitude of external apical root resorption (EARR) of incisors 6 months after starting orthodontic treatment using orthodontic aligners and fixed appliance.
Material and Methods: This was a parallel, randomized clinical trial. The sample comprised 40 patients randomly allocated into 2 groups: OA (orthodontic aligners, n=20, 160 incisors) and FA (Fixed Orthodontic Appliance, n=20, 160 incisors). In order to evaluate tooth length, periapical radiographs and standardized linear measurements of the upper and lower incisors were performed before (T0) and 6 months after beginning treatment (T1), the amount of EARR being calculated through the difference in length (T1-T0). For compatibility comparison, independent t-tests and Chi-squared tests were performed; dependent t-test was performed for intragroup comparison; while intergroup comparison of EARR was performed by covariance analysis; α = 5%; 95% confidence interval.
Results: A significant difference in intragroup comparison was observed, with a variance ranging from -0.52mm to -0.88mm in the FA group and from -0.52mm to -0.85mm in the OA group. In the intergroup evaluation, only tooth 21 presented statistically significant difference (OA: -0.52±0.57mm, FA: -0.86±0.60mm); however, differences between groups were clinically insignificant, ranging from 0.03 to 0.35mm. Moreover, neither group exhibited tooth resorption greater than or equal to 1 mm.
Conclusion: Six months after starting treatment, a similar degree of EARR of the upper and lower incisors in the OA and FA groups was observed. Both groups exhibited a rounding of the root apex, representing 2.88% of EARR, 97.12% of tooth lengths thus remaining unchanged.

Keywords: Orthodontics. Tooth movement. Root Resorption. Clear aligner treatment.

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Korean J Orthod

Published online April 1, 2021

Copyright © The Korean Association of Orthodontists.

EXTERNAL APICAL ROOT RESORPTION 6 MONTHS AFTER INITIATION OF ORTHODONTIC TREATMENT WITH FIXED APPLIANCE AND ORTHODONTIC ALIGNERS: RANDOMIZED CLINICAL TRIAL

Katia Cristina Toyokawa-Sperandio (First Author)
Former graduate student – UNOPAR University of North Paraná
Ana Cláudia de Castro Ferreira Conti
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Thais Maria Freire Fernandes
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Renata Rodrigues de Almeida-Pedrin
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Marcio Rodrigues de Almeida
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Paula Vanessa Pedron Oltramari (Corresponding author)
Full Professor, Orthodontic Department, University of North Parana (UNOPAR)
Rua do US Open, 272 – Q10, L12
Zip Code: 86058-138 Londrina/PR Brasil
Phone number: +55 43 991344499
email address: pvoltramari@hotmail.com

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: To compare the magnitude of external apical root resorption (EARR) of incisors 6 months after starting orthodontic treatment using orthodontic aligners and fixed appliance.
Material and Methods: This was a parallel, randomized clinical trial. The sample comprised 40 patients randomly allocated into 2 groups: OA (orthodontic aligners, n=20, 160 incisors) and FA (Fixed Orthodontic Appliance, n=20, 160 incisors). In order to evaluate tooth length, periapical radiographs and standardized linear measurements of the upper and lower incisors were performed before (T0) and 6 months after beginning treatment (T1), the amount of EARR being calculated through the difference in length (T1-T0). For compatibility comparison, independent t-tests and Chi-squared tests were performed; dependent t-test was performed for intragroup comparison; while intergroup comparison of EARR was performed by covariance analysis; α = 5%; 95% confidence interval.
Results: A significant difference in intragroup comparison was observed, with a variance ranging from -0.52mm to -0.88mm in the FA group and from -0.52mm to -0.85mm in the OA group. In the intergroup evaluation, only tooth 21 presented statistically significant difference (OA: -0.52±0.57mm, FA: -0.86±0.60mm); however, differences between groups were clinically insignificant, ranging from 0.03 to 0.35mm. Moreover, neither group exhibited tooth resorption greater than or equal to 1 mm.
Conclusion: Six months after starting treatment, a similar degree of EARR of the upper and lower incisors in the OA and FA groups was observed. Both groups exhibited a rounding of the root apex, representing 2.88% of EARR, 97.12% of tooth lengths thus remaining unchanged.

Keywords: Orthodontics. Tooth movement. Root Resorption. Clear aligner treatment.