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Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism

The aim of this study is to determine the minimum required thickness of a monolithic zirconia crown in the mandibular posterior area for patients with bruxism. Forty-nine full zirconia crowns, with seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm, were made by using a...

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Autores principales: Lan, Ting-Hsun, Pan, Chin-Yun, Liu, Pao-Hsin, Chou, Mitch M. C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6567035/
https://www.ncbi.nlm.nih.gov/pubmed/31108872
http://dx.doi.org/10.3390/ma12101623
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author Lan, Ting-Hsun
Pan, Chin-Yun
Liu, Pao-Hsin
Chou, Mitch M. C.
author_facet Lan, Ting-Hsun
Pan, Chin-Yun
Liu, Pao-Hsin
Chou, Mitch M. C.
author_sort Lan, Ting-Hsun
collection PubMed
description The aim of this study is to determine the minimum required thickness of a monolithic zirconia crown in the mandibular posterior area for patients with bruxism. Forty-nine full zirconia crowns, with seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm, were made by using a computer-aided design/computer-aided manufacturing system (CAD/CAM). Seven crowns in each group were subjected to cyclic loading at 800 N and 5 Hz in a servohydraulic testing machine until fracture or completion of 100,000 cycles. Seven finite element models comprising seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm were simulated using three different loads of vertical 800 N, oblique 10 degrees 800 N, and vertical 800 N + x N torque (x = 10, 50, and 100). The results of cyclic loading tests showed that the fracture resistance of the crown was positively associated with thickness. Specimen breakage differed significantly according to the different thicknesses of the prostheses (p < 0.01). Lowest von Mises stress values were determined for prostheses with a minimal thickness of 1.0 mm in different loading directions and with different forces. Zirconia specimens of 1.0 mm thickness had the lowest stress values and high fracture resistance and under 800 N of loading.
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spelling pubmed-65670352019-06-17 Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism Lan, Ting-Hsun Pan, Chin-Yun Liu, Pao-Hsin Chou, Mitch M. C. Materials (Basel) Article The aim of this study is to determine the minimum required thickness of a monolithic zirconia crown in the mandibular posterior area for patients with bruxism. Forty-nine full zirconia crowns, with seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm, were made by using a computer-aided design/computer-aided manufacturing system (CAD/CAM). Seven crowns in each group were subjected to cyclic loading at 800 N and 5 Hz in a servohydraulic testing machine until fracture or completion of 100,000 cycles. Seven finite element models comprising seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm were simulated using three different loads of vertical 800 N, oblique 10 degrees 800 N, and vertical 800 N + x N torque (x = 10, 50, and 100). The results of cyclic loading tests showed that the fracture resistance of the crown was positively associated with thickness. Specimen breakage differed significantly according to the different thicknesses of the prostheses (p < 0.01). Lowest von Mises stress values were determined for prostheses with a minimal thickness of 1.0 mm in different loading directions and with different forces. Zirconia specimens of 1.0 mm thickness had the lowest stress values and high fracture resistance and under 800 N of loading. MDPI 2019-05-17 /pmc/articles/PMC6567035/ /pubmed/31108872 http://dx.doi.org/10.3390/ma12101623 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Lan, Ting-Hsun
Pan, Chin-Yun
Liu, Pao-Hsin
Chou, Mitch M. C.
Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism
title Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism
title_full Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism
title_fullStr Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism
title_full_unstemmed Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism
title_short Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism
title_sort fracture resistance of monolithic zirconia crowns in implant prostheses in patients with bruxism
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6567035/
https://www.ncbi.nlm.nih.gov/pubmed/31108872
http://dx.doi.org/10.3390/ma12101623
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