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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| Format: | Article |
| Language: | English |
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Dove Medical Press
2016-10-01
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| Series: | International Journal of Nanomedicine |
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| Online Access: | https://www.dovepress.com/influence-of-incorporation-of-zro2-nanoparticles--on-the-repair-streng-peer-reviewed-article-IJN |
| _version_ | 1818744003546316800 |
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| 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 |
| collection | DOAJ |
| 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 |
| first_indexed | 2024-12-18T02:37:24Z |
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| institution | Directory Open Access Journal |
| issn | 1178-2013 |
| language | English |
| last_indexed | 2024-12-18T02:37:24Z |
| publishDate | 2016-10-01 |
| publisher | Dove Medical Press |
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| series | International Journal of Nanomedicine |
| spelling | doaj.art-0b5f23a53d8b4438a664f5c4c1e5c4922022-12-21T21:23:44ZengDove Medical PressInternational Journal of Nanomedicine1178-20132016-10-01Volume 115633564329725Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture basesGad MMRahoma AAl-Thobity AMArRejaie ASMohammed 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 nanoparticleshttps://www.dovepress.com/influence-of-incorporation-of-zro2-nanoparticles--on-the-repair-streng-peer-reviewed-article-IJNDenture repairFlexural strengthImpact strengthNano-ZrO2PMMA |
| spellingShingle | Gad MM Rahoma A Al-Thobity AM ArRejaie AS Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases International Journal of Nanomedicine Denture repair Flexural strength Impact strength Nano-ZrO2 PMMA |
| title | 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_short | 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 |
| topic | Denture repair Flexural strength Impact strength Nano-ZrO2 PMMA |
| url | https://www.dovepress.com/influence-of-incorporation-of-zro2-nanoparticles--on-the-repair-streng-peer-reviewed-article-IJN |
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