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Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis

OBJECTIVES: To understand the effect of the biomechanical differences by assessing pre and post retraction torque, amount of retraction and arch width changes in both techniques. METHODOLOGY: A three-dimensional geometric model of maxilla with all upper teeth except first premolar was generated base...

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Autores principales: Lekshmi, S. P., Peter, Elbe, Ani, G. Suja
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Wolters Kluwer - Medknow 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8035846/
https://www.ncbi.nlm.nih.gov/pubmed/33850396
http://dx.doi.org/10.4103/ccd.ccd_197_19
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author Lekshmi, S. P.
Peter, Elbe
Ani, G. Suja
author_facet Lekshmi, S. P.
Peter, Elbe
Ani, G. Suja
author_sort Lekshmi, S. P.
collection PubMed
description OBJECTIVES: To understand the effect of the biomechanical differences by assessing pre and post retraction torque, amount of retraction and arch width changes in both techniques. METHODOLOGY: A three-dimensional geometric model of maxilla with all upper teeth except first premolar was generated based on computed tomography radiograph of a dry skull using the computer program Hypermesh. 13.0. Virtual models of 0.022 ”Roth labial brackets and 0.018 ”ORMCO 7(th) generation lingual brackets; and for labial brackets 0.019 × 0.025” SS archwire and for lingual brackets 0.016 × 0.024” SS archwire were constructed. Sliding mechanics was used during en-masse retraction by applying a 300 g distal force on both sides of the dentition from canine to the second premolar brackets in the labial and lingual simulation. The finite element program ANSYS 12.1 was used to calculate the torque and displacement. RESULTS: The results stipulated that in transverse direction there was lingual tipping of anteriors, mild buccal flaring in second premolars and first molars and lingual tipping in second molar in lingual appliance. In the sagittal plane, the greater distal movement of posteriors and an up-righting tendency of molars were observed in lingual appliance. Extrusion of anterior teeth were observed in both appliances. Regarding the premolars and first molars, labial movements and relative intrusion were observed in lingual appliance compared to labial appliance. CONCLUSION: In lingual treatment, it is crucial to increase the lingual root torque. The amount of retraction and arch widening were more in lingual appliance compared to labial technique.
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spelling pubmed-80358462021-04-12 Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis Lekshmi, S. P. Peter, Elbe Ani, G. Suja Contemp Clin Dent Original Article OBJECTIVES: To understand the effect of the biomechanical differences by assessing pre and post retraction torque, amount of retraction and arch width changes in both techniques. METHODOLOGY: A three-dimensional geometric model of maxilla with all upper teeth except first premolar was generated based on computed tomography radiograph of a dry skull using the computer program Hypermesh. 13.0. Virtual models of 0.022 ”Roth labial brackets and 0.018 ”ORMCO 7(th) generation lingual brackets; and for labial brackets 0.019 × 0.025” SS archwire and for lingual brackets 0.016 × 0.024” SS archwire were constructed. Sliding mechanics was used during en-masse retraction by applying a 300 g distal force on both sides of the dentition from canine to the second premolar brackets in the labial and lingual simulation. The finite element program ANSYS 12.1 was used to calculate the torque and displacement. RESULTS: The results stipulated that in transverse direction there was lingual tipping of anteriors, mild buccal flaring in second premolars and first molars and lingual tipping in second molar in lingual appliance. In the sagittal plane, the greater distal movement of posteriors and an up-righting tendency of molars were observed in lingual appliance. Extrusion of anterior teeth were observed in both appliances. Regarding the premolars and first molars, labial movements and relative intrusion were observed in lingual appliance compared to labial appliance. CONCLUSION: In lingual treatment, it is crucial to increase the lingual root torque. The amount of retraction and arch widening were more in lingual appliance compared to labial technique. Wolters Kluwer - Medknow 2020 2020-12-20 /pmc/articles/PMC8035846/ /pubmed/33850396 http://dx.doi.org/10.4103/ccd.ccd_197_19 Text en Copyright: © 2020 Contemporary Clinical Dentistry https://creativecommons.org/licenses/by-nc-sa/4.0/This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
spellingShingle Original Article
Lekshmi, S. P.
Peter, Elbe
Ani, G. Suja
Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis
title Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis
title_full Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis
title_fullStr Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis
title_full_unstemmed Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis
title_short Is There a Need to Increase Palatal Root Torque of Upper Incisors in Lingual Appliance? A Finite Element Analysis
title_sort is there a need to increase palatal root torque of upper incisors in lingual appliance? a finite element analysis
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8035846/
https://www.ncbi.nlm.nih.gov/pubmed/33850396
http://dx.doi.org/10.4103/ccd.ccd_197_19
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