Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases

Mohammed M Gad,1 Ahmed Rahoma,2,3 Ahmad M Al-Thobity,1 Aws S ArRejaie4 1Department of Substitutive Dental Sciences, 2Department of Restorative Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia; 3Department of Dental Materials, College of Dentistry, Al-Azhar Universit...

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Autores principales:	Gad MM, Rahoma A, Al-Thobity AM, ArRejaie AS
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2016
Materias:	Denture repair Flexural strength Impact strength Nano-ZrO2 PMMA Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/0b5f23a53d8b4438a664f5c4c1e5c492
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spelling	oai:doaj.org-article:0b5f23a53d8b4438a664f5c4c1e5c4922021-12-02T05:20:25ZInfluence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases1178-2013https://doaj.org/article/0b5f23a53d8b4438a664f5c4c1e5c4922016-10-01T00:00:00Zhttps://www.dovepress.com/influence-of-incorporation-of-zro2-nanoparticles--on-the-repair-streng-peer-reviewed-article-IJNhttps://doaj.org/toc/1178-2013Mohammed M Gad,1 Ahmed Rahoma,2,3 Ahmad M Al-Thobity,1 Aws S ArRejaie4 1Department of Substitutive Dental Sciences, 2Department of Restorative Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia; 3Department of Dental Materials, College of Dentistry, Al-Azhar University, Assiut, Egypt; 4Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia Background: Repeated fracture of the denture base is a common problem in prosthodontics, and it represents a nuisance and a time sink for the clinician. Therefore, the possibility of increasing repair strength using new reinforcement materials is of great interest to prosthodontists.Aim of the study: This study aimed to evaluate the effects of incorporation of zirconia nanoparticles (nano-ZrO2) on the flexural strength and impact strength of repaired polymethyl methacrylate (PMMA) denture bases.Materials and methods: One hundred eighty specimens of heat-polymerized acrylic resin were fabricated (90 for each test) and divided into three main groups: one control group (intact specimens) and two groups divided according to surface design (45° bevels and butt joints), in which specimens were prepared in pairs to create 2.5 mm gaps. Nano-ZrO2 was added to repair resin in 2.5 wt%, 5 wt%, and 7.5 wt% concentrations of acrylic powder. A three-point bending test was used to measure flexural strength, and a Charpy-type test was used to measure impact strength. Scanning electron microscopy was used to analyze the fracture surfaces and nano-ZrO2 distribution. The results were analyzed with a paired sample t-test and an unpaired t-test, with a P-value of ≤0.05 being significant.Results: Incorporation of nano-ZrO2 into the repair resin significantly increased flexural strength (P<0.05). The highest value was found in the bevel group reinforced with 7.5% nano-ZrO2, whereas the lowest value was found in the butt group reinforced with 2.5% nano-ZrO2. The impact strength values of all repaired groups were significantly lower than those of the control group (P<0.05). Among repaired groups, the higher impact strength value was seen in the butt group reinforced with 2.5% nano-ZrO2. The bevel joint demonstrated mainly cohesive failure, whereas the butt joint demonstrated mainly adhesive failure.Conclusion: Incorporation of nano-ZrO2 into the repair resin improved the flexural strength of repaired denture bases, whereas it decreased impact strength, especially with high nano-ZrO2 concentrations. Keywords: denture repair, flexural strength, impact strength, PMMA, ZrO2 nanoparticlesGad MMRahoma AAl-Thobity AMArRejaie ASDove Medical PressarticleDenture repairFlexural strengthImpact strengthNano-ZrO2PMMAMedicine (General)R5-920ENInternational Journal of Nanomedicine, Vol Volume 11, Pp 5633-5643 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	Denture repair Flexural strength Impact strength Nano-ZrO2 PMMA Medicine (General) R5-920
spellingShingle	Denture repair Flexural strength Impact strength Nano-ZrO2 PMMA Medicine (General) R5-920 Gad MM Rahoma A Al-Thobity AM ArRejaie AS Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
description	Mohammed M Gad,1 Ahmed Rahoma,2,3 Ahmad M Al-Thobity,1 Aws S ArRejaie4 1Department of Substitutive Dental Sciences, 2Department of Restorative Dental Sciences, College of Dentistry, University of Dammam, Dammam, Saudi Arabia; 3Department of Dental Materials, College of Dentistry, Al-Azhar University, Assiut, Egypt; 4Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia Background: Repeated fracture of the denture base is a common problem in prosthodontics, and it represents a nuisance and a time sink for the clinician. Therefore, the possibility of increasing repair strength using new reinforcement materials is of great interest to prosthodontists.Aim of the study: This study aimed to evaluate the effects of incorporation of zirconia nanoparticles (nano-ZrO2) on the flexural strength and impact strength of repaired polymethyl methacrylate (PMMA) denture bases.Materials and methods: One hundred eighty specimens of heat-polymerized acrylic resin were fabricated (90 for each test) and divided into three main groups: one control group (intact specimens) and two groups divided according to surface design (45° bevels and butt joints), in which specimens were prepared in pairs to create 2.5 mm gaps. Nano-ZrO2 was added to repair resin in 2.5 wt%, 5 wt%, and 7.5 wt% concentrations of acrylic powder. A three-point bending test was used to measure flexural strength, and a Charpy-type test was used to measure impact strength. Scanning electron microscopy was used to analyze the fracture surfaces and nano-ZrO2 distribution. The results were analyzed with a paired sample t-test and an unpaired t-test, with a P-value of ≤0.05 being significant.Results: Incorporation of nano-ZrO2 into the repair resin significantly increased flexural strength (P<0.05). The highest value was found in the bevel group reinforced with 7.5% nano-ZrO2, whereas the lowest value was found in the butt group reinforced with 2.5% nano-ZrO2. The impact strength values of all repaired groups were significantly lower than those of the control group (P<0.05). Among repaired groups, the higher impact strength value was seen in the butt group reinforced with 2.5% nano-ZrO2. The bevel joint demonstrated mainly cohesive failure, whereas the butt joint demonstrated mainly adhesive failure.Conclusion: Incorporation of nano-ZrO2 into the repair resin improved the flexural strength of repaired denture bases, whereas it decreased impact strength, especially with high nano-ZrO2 concentrations. Keywords: denture repair, flexural strength, impact strength, PMMA, ZrO2 nanoparticles
format	article
author	Gad MM Rahoma A Al-Thobity AM ArRejaie AS
author_facet	Gad MM Rahoma A Al-Thobity AM ArRejaie AS
author_sort	Gad MM
title	Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
title_short	Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
title_full	Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
title_fullStr	Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
title_full_unstemmed	Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
title_sort	influence of incorporation of zro2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
publisher	Dove Medical Press
publishDate	2016
url	https://doaj.org/article/0b5f23a53d8b4438a664f5c4c1e5c492
work_keys_str_mv	AT gadmm influenceofincorporationofzro2nanoparticlesontherepairstrengthofpolymethylmethacrylatedenturebases AT rahomaa influenceofincorporationofzro2nanoparticlesontherepairstrengthofpolymethylmethacrylatedenturebases AT althobityam influenceofincorporationofzro2nanoparticlesontherepairstrengthofpolymethylmethacrylatedenturebases AT arrejaieas influenceofincorporationofzro2nanoparticlesontherepairstrengthofpolymethylmethacrylatedenturebases
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Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases

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