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Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis

BACKGROUND: Maxillary protraction with facemask (FM) is an orthopedic approach for treatment of Class III growing patients. Aim of the present investigation was to analyze tension loads produced by two different facial mask (FM) designs on facial skin of subject with skeletal Class III. METHODS: A t...

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Autores principales: Gazzani, Francesca, Pavoni, Chiara, Cozza, Paola, Lione, Roberta
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6374895/
https://www.ncbi.nlm.nih.gov/pubmed/30760252
http://dx.doi.org/10.1186/s12903-019-0724-6
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author Gazzani, Francesca
Pavoni, Chiara
Cozza, Paola
Lione, Roberta
author_facet Gazzani, Francesca
Pavoni, Chiara
Cozza, Paola
Lione, Roberta
author_sort Gazzani, Francesca
collection PubMed
description BACKGROUND: Maxillary protraction with facemask (FM) is an orthopedic approach for treatment of Class III growing patients. Aim of the present investigation was to analyze tension loads produced by two different facial mask (FM) designs on facial skin of subject with skeletal Class III. METHODS: A three-dimensional (3D) geometry of Delaire and Petit FM models were reconstructed from the original Computer Aided Design (CAD) 3D prototype using software package (ANSYS 5.7). A traction load of 9.8 N inclined of 30° to the occlusal plane was applied combining analytical FM models with a 3D facial model. Resulting stresses and deformations on the skin layer were tested through the von Mises yield criterion. RESULTS: Overall tensions were mostly developed on the chin area, while lower stresses were observed on forehead area for both FM designs. When Delaire FM model was tested, maximum stresses were observed on the upper border of the chin cup corresponding to the inferior lip and to marginal gingiva of lower incisors. After Petit FM application, maximum stresses were more extensively localized at the level of both upper border and central area of the chin. Stresses measured on the chin area were significantly higher with Petit FM when compared with Delaire FM (44 KPa versus 29 KPa, respectively). CONCLUSIONS: Delaire FM determined lower stresses and tensile tensions than Petit FM model. Highest tensions were observed at the level of chin cup area for both Delaire and Petit FM. Stresses following Delaire FM application were mostly observed on the upper border of the chin cup, while Petit FM determined stresses more extensively distributed to the central area of the chin.
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spelling pubmed-63748952019-02-26 Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis Gazzani, Francesca Pavoni, Chiara Cozza, Paola Lione, Roberta BMC Oral Health Research Article BACKGROUND: Maxillary protraction with facemask (FM) is an orthopedic approach for treatment of Class III growing patients. Aim of the present investigation was to analyze tension loads produced by two different facial mask (FM) designs on facial skin of subject with skeletal Class III. METHODS: A three-dimensional (3D) geometry of Delaire and Petit FM models were reconstructed from the original Computer Aided Design (CAD) 3D prototype using software package (ANSYS 5.7). A traction load of 9.8 N inclined of 30° to the occlusal plane was applied combining analytical FM models with a 3D facial model. Resulting stresses and deformations on the skin layer were tested through the von Mises yield criterion. RESULTS: Overall tensions were mostly developed on the chin area, while lower stresses were observed on forehead area for both FM designs. When Delaire FM model was tested, maximum stresses were observed on the upper border of the chin cup corresponding to the inferior lip and to marginal gingiva of lower incisors. After Petit FM application, maximum stresses were more extensively localized at the level of both upper border and central area of the chin. Stresses measured on the chin area were significantly higher with Petit FM when compared with Delaire FM (44 KPa versus 29 KPa, respectively). CONCLUSIONS: Delaire FM determined lower stresses and tensile tensions than Petit FM model. Highest tensions were observed at the level of chin cup area for both Delaire and Petit FM. Stresses following Delaire FM application were mostly observed on the upper border of the chin cup, while Petit FM determined stresses more extensively distributed to the central area of the chin. BioMed Central 2019-02-13 /pmc/articles/PMC6374895/ /pubmed/30760252 http://dx.doi.org/10.1186/s12903-019-0724-6 Text en © The Author(s). 2019 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
Gazzani, Francesca
Pavoni, Chiara
Cozza, Paola
Lione, Roberta
Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis
title Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis
title_full Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis
title_fullStr Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis
title_full_unstemmed Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis
title_short Stress on facial skin of class III subjects during maxillary protraction: a finite element analysis
title_sort stress on facial skin of class iii subjects during maxillary protraction: a finite element analysis
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6374895/
https://www.ncbi.nlm.nih.gov/pubmed/30760252
http://dx.doi.org/10.1186/s12903-019-0724-6
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