Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
Influence of incorporation of ZrO2 nanoparticles on the repair strength of polymethyl methacrylate denture bases
Blog Article
Mohammed M Gad,1 Ahmed Rahoma,2,3 Ahmad M Al-Thobity,1 Foot Protection 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 Test Kits 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.