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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   

First Published Date May 30, 2022

Copyright © The Korean Association of Orthodontists.

Clinical effects of different prescriptions on the inclination of maxillary and mandibular incisors by using passive self-ligating brackets

Fabio SAVOLDI1, Linda SANGALLI2, Luis T. HUANCA GHISLANZONI3, Domenico DALESSANDRI4, Min GU1, Gualtiero MANDELLI4, Corrado PAGANELLI4

1 Orthodontics, Division of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR.
2 Division of Orofacial Pain, College of Dentistry, University of Kentucky, Kentucky, USA.
3 Department of Orthodontics, University of Geneva, Geneva, Switzerland.
4 Orthodontics, Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Brescia, Italy.

Correspondence to:Dr. Min GU, Orthodontics, 2/F, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong SAR.
E-mail: drgumin@hku.hk
Tel: +852 2859 0258
Fax: +852 2559 3803

Abstract

Objective: Controlling the incisal inclination is fundamental in orthodontics. However, the relationship between the inclination prescription and its clinical outcome is not obvious. Thus, incisal inclination changes generated by different bracket prescriptions were analysed.
Methods: 28 non-extraction dental Class II patients (15 females, 13 males), mean age 12.9±1.3 years, were retrospectively analysed. Patients were treated using passive self-ligating fixed appliances with three inclination prescriptions for maxillary incisors (high, standard, low), and two for mandibular incisors (standard, low). Clinical outcomes were compared among different prescriptions, and regression analysis was used to explain the effects of bracket prescription and to understand the prescription selection criteria (α=0.05).
Results: Regarding maxillary central incisors, low and high prescriptions were related to linguoversion (p=0.046) and labioversion (p=0.005), respectively, while standard prescription maintained the initial dental inclination. Maxillary lateral incisors did not show significant changes. Regarding mandibular incisors, low prescription led to linguoversion (p=0.005 for centrals, p=0.010 for laterals), while standard prescription led to labioversion (p=0.045 for centrals, p=0.005 for laterals). The regression models showed that the main factors affecting the inclination changes were the imposed change and the selected prescription, while the prescription selection was mainly influenced by the initial dental inclination and initial intercanine distance.
Conclusions: The direction of the correction of the incisal inclination can be controlled by choosing a certain prescription. However, the final inclination that is clinically obtained may have limited consistency with the chosen prescription. The amount of imposed inclination change was the most relevant predictor of the clinical outcome.

Keywords: Digital models, tooth movement, incisor, orthodontic brackets.

Article

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Korean J Orthod   

First Published Date May 30, 2022

Copyright © The Korean Association of Orthodontists.

Clinical effects of different prescriptions on the inclination of maxillary and mandibular incisors by using passive self-ligating brackets

Fabio SAVOLDI1, Linda SANGALLI2, Luis T. HUANCA GHISLANZONI3, Domenico DALESSANDRI4, Min GU1, Gualtiero MANDELLI4, Corrado PAGANELLI4

1 Orthodontics, Division of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, the University of Hong Kong, Hong Kong SAR.
2 Division of Orofacial Pain, College of Dentistry, University of Kentucky, Kentucky, USA.
3 Department of Orthodontics, University of Geneva, Geneva, Switzerland.
4 Orthodontics, Dental School, Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Brescia, Italy.

Correspondence to:Dr. Min GU, Orthodontics, 2/F, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong SAR.
E-mail: drgumin@hku.hk
Tel: +852 2859 0258
Fax: +852 2559 3803

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: Controlling the incisal inclination is fundamental in orthodontics. However, the relationship between the inclination prescription and its clinical outcome is not obvious. Thus, incisal inclination changes generated by different bracket prescriptions were analysed.
Methods: 28 non-extraction dental Class II patients (15 females, 13 males), mean age 12.9±1.3 years, were retrospectively analysed. Patients were treated using passive self-ligating fixed appliances with three inclination prescriptions for maxillary incisors (high, standard, low), and two for mandibular incisors (standard, low). Clinical outcomes were compared among different prescriptions, and regression analysis was used to explain the effects of bracket prescription and to understand the prescription selection criteria (α=0.05).
Results: Regarding maxillary central incisors, low and high prescriptions were related to linguoversion (p=0.046) and labioversion (p=0.005), respectively, while standard prescription maintained the initial dental inclination. Maxillary lateral incisors did not show significant changes. Regarding mandibular incisors, low prescription led to linguoversion (p=0.005 for centrals, p=0.010 for laterals), while standard prescription led to labioversion (p=0.045 for centrals, p=0.005 for laterals). The regression models showed that the main factors affecting the inclination changes were the imposed change and the selected prescription, while the prescription selection was mainly influenced by the initial dental inclination and initial intercanine distance.
Conclusions: The direction of the correction of the incisal inclination can be controlled by choosing a certain prescription. However, the final inclination that is clinically obtained may have limited consistency with the chosen prescription. The amount of imposed inclination change was the most relevant predictor of the clinical outcome.

Keywords: Digital models, tooth movement, incisor, orthodontic brackets.