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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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Association for Dental Sciences of the Republic of China
2017
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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. |
format | Online Article Text |
id | pubmed-6395356 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Association for Dental Sciences of the Republic of China |
record_format | MEDLINE/PubMed |
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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