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The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study

BACKGROUND/PURPOSE: Geometric design dictates the mechanical performance of nickel–titanium rotary instruments. Using finite element (FE) analysis, this study evaluated the effects of an off-centered cross-sectional design on the stiffness and stress distribution of nickel–titanium rotary instrument...

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Autores principales: Ha, Jung-Hong, Kwak, Sang Won, Versluis, Antheunis, Lee, Chan-Joo, Park, Se-Hee, Kim, Hyeon-Cheol
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Association for Dental Sciences of the Republic of China 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6395356/
https://www.ncbi.nlm.nih.gov/pubmed/30895044
http://dx.doi.org/10.1016/j.jds.2016.11.005
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author Ha, Jung-Hong
Kwak, Sang Won
Versluis, Antheunis
Lee, Chan-Joo
Park, Se-Hee
Kim, Hyeon-Cheol
author_facet Ha, Jung-Hong
Kwak, Sang Won
Versluis, Antheunis
Lee, Chan-Joo
Park, Se-Hee
Kim, Hyeon-Cheol
author_sort Ha, Jung-Hong
collection PubMed
description BACKGROUND/PURPOSE: Geometric design dictates the mechanical performance of nickel–titanium rotary instruments. Using finite element (FE) analysis, this study evaluated the effects of an off-centered cross-sectional design on the stiffness and stress distribution of nickel–titanium rotary instruments. MATERIALS AND METHODS: We constructed three-dimensional FE models, using ProTaper-NEXT type design (PTN) as well as three other virtual instruments with varied cross-sectional aspect ratios but all with the same cross-sectional area. The cross-sectional aspect ratio of the PTN was 0.75, while others were assigned to have ratios of 1.0 (square), 1.5 (rectangle), and 2.215 (centered-rectangle). The PTN center of the cross-section was ‘k’, while others were designed to have 0.9992k, 0.7k, and 0 for the square, rectangle, and centered-rectangle models, respectively. To compare the stiffness of the four FE models, we numerically analyzed their mechanical response under bending and torque. RESULTS: Under the bending condition, the square model was found to be the stiffest, followed by the PTN, rectangle, and then the centered-rectangle model. Under the torsion, the square model had the smallest distortion angle, while the rectangular model had the highest distortion angle. CONCLUSION: Under the limitation of this study, the PTN type off-centered cross-sectional design appeared the most optimal configuration among the tested designs for high bending stiffness with cutting efficiency while rotational stiffness remained similar with the other designs.
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spelling pubmed-63953562019-03-20 The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study Ha, Jung-Hong Kwak, Sang Won Versluis, Antheunis Lee, Chan-Joo Park, Se-Hee Kim, Hyeon-Cheol J Dent Sci Original Article BACKGROUND/PURPOSE: Geometric design dictates the mechanical performance of nickel–titanium rotary instruments. Using finite element (FE) analysis, this study evaluated the effects of an off-centered cross-sectional design on the stiffness and stress distribution of nickel–titanium rotary instruments. MATERIALS AND METHODS: We constructed three-dimensional FE models, using ProTaper-NEXT type design (PTN) as well as three other virtual instruments with varied cross-sectional aspect ratios but all with the same cross-sectional area. The cross-sectional aspect ratio of the PTN was 0.75, while others were assigned to have ratios of 1.0 (square), 1.5 (rectangle), and 2.215 (centered-rectangle). The PTN center of the cross-section was ‘k’, while others were designed to have 0.9992k, 0.7k, and 0 for the square, rectangle, and centered-rectangle models, respectively. To compare the stiffness of the four FE models, we numerically analyzed their mechanical response under bending and torque. RESULTS: Under the bending condition, the square model was found to be the stiffest, followed by the PTN, rectangle, and then the centered-rectangle model. Under the torsion, the square model had the smallest distortion angle, while the rectangular model had the highest distortion angle. CONCLUSION: Under the limitation of this study, the PTN type off-centered cross-sectional design appeared the most optimal configuration among the tested designs for high bending stiffness with cutting efficiency while rotational stiffness remained similar with the other designs. Association for Dental Sciences of the Republic of China 2017-06 2017-03-14 /pmc/articles/PMC6395356/ /pubmed/30895044 http://dx.doi.org/10.1016/j.jds.2016.11.005 Text en © 2017 Association for Dental Sciences of the Republic of China. Publishing services by Elsevier B.V. http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Article
Ha, Jung-Hong
Kwak, Sang Won
Versluis, Antheunis
Lee, Chan-Joo
Park, Se-Hee
Kim, Hyeon-Cheol
The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study
title The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study
title_full The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study
title_fullStr The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study
title_full_unstemmed The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study
title_short The geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: A finite element analysis study
title_sort geometric effect of an off-centered cross-section on nickel–titanium rotary instruments: a finite element analysis study
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6395356/
https://www.ncbi.nlm.nih.gov/pubmed/30895044
http://dx.doi.org/10.1016/j.jds.2016.11.005
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