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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod

Published online July 5, 2021

Copyright © The Korean Association of Orthodontists.

Effects of self-ligating bracket and other factors influencing orthodontic treatment outcome: A prospective cohort study

Min-Ho Jung, DDS, MSD, PhD

Clinical Professor, Department of Orthodontic, Dental Research Institute and School of Dentistry, Seoul National University, Seoul, Korea; Private practice, Seoul, Korea

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: The purpose of this prospective cohort study was to evaluate the effects of a selfligating bracket (SB) and other factors that influence orthodontic treatment outcome. Methods: This was a two-armed cohort study using consecutively treated patients in a private practice. The patients were asked to choose between SB and a conventional bracket (CB) and if the patient did not have a preference, that patient was allocated randomly. All the patients were treated using an identical archwire sequence. The treatment duration, number of bracket failures, poor oral hygiene, poor elastic wear, extraction, whether or not to use orthodontic mini-implant (OMI), OMI failure, American Board of Orthodontics (ABO) Discrepancy Index (DI), arch length discrepancy and ABO Cast-Radiograph Evaluation (CRE) score were measured and analyzed. To predict CRE, stepwise regression analysis was conducted to generate the equation. Results: The final sample comprised 134 patients with an average age of 22.73 years. The average DI, CRE and treatment duration were 21.81, 14.25 and 28.63 months, respectively. Analysis of covariance showed a significant difference in CRE between CB and SB after adjusting for the effects of confounding variables. Stepwise regression analysis can explain only 25.2% of the variance in CRE score using four variables. Conclusions: CB showed a significantly better CRE score compared with SB but its clinical significance seems to be limited. Extraction, bracket type, poor elastic wear and additional appliance use had significant impacts on treatment outcome.

Keywords: Bracket, Cast-Radiograph Evaluation, Orthodontic index, Compliance

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Korean J Orthod

Published online July 5, 2021

Copyright © The Korean Association of Orthodontists.

Effects of self-ligating bracket and other factors influencing orthodontic treatment outcome: A prospective cohort study

Min-Ho Jung, DDS, MSD, PhD

Clinical Professor, Department of Orthodontic, Dental Research Institute and School of Dentistry, Seoul National University, Seoul, Korea; Private practice, Seoul, Korea

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: The purpose of this prospective cohort study was to evaluate the effects of a selfligating bracket (SB) and other factors that influence orthodontic treatment outcome. Methods: This was a two-armed cohort study using consecutively treated patients in a private practice. The patients were asked to choose between SB and a conventional bracket (CB) and if the patient did not have a preference, that patient was allocated randomly. All the patients were treated using an identical archwire sequence. The treatment duration, number of bracket failures, poor oral hygiene, poor elastic wear, extraction, whether or not to use orthodontic mini-implant (OMI), OMI failure, American Board of Orthodontics (ABO) Discrepancy Index (DI), arch length discrepancy and ABO Cast-Radiograph Evaluation (CRE) score were measured and analyzed. To predict CRE, stepwise regression analysis was conducted to generate the equation. Results: The final sample comprised 134 patients with an average age of 22.73 years. The average DI, CRE and treatment duration were 21.81, 14.25 and 28.63 months, respectively. Analysis of covariance showed a significant difference in CRE between CB and SB after adjusting for the effects of confounding variables. Stepwise regression analysis can explain only 25.2% of the variance in CRE score using four variables. Conclusions: CB showed a significantly better CRE score compared with SB but its clinical significance seems to be limited. Extraction, bracket type, poor elastic wear and additional appliance use had significant impacts on treatment outcome.

Keywords: Bracket, Cast-Radiograph Evaluation, Orthodontic index, Compliance