Abstract
BackgroundThe purpose of this study was to evaluate the effect of aging process on the tensile strength (TS) of repaired acrylic denture base using ZrO2 nanoparticles (nano-ZrO2)-reinforced autopolymerized resin. Material and MethodsA total of 240 heat-polymerized acrylic resin specimens (n=10) were prepared and sectioned creating 2 mm-repair-gap. Autopolymerized acrylic resin, pure and modified with 2.5, 5, and 7.5wt% nano-ZrO2 were used for specimens repair. TS of repaired specimens were measured using the universal testing machine after water immersion at 37oC for 2, 7 and 30 days. At each time interval, half the immersed specimens underwent thermo-cycling aging process (5000 cycles at 5/55°C) before TS testing. One-way ANOVA and Tukey-Kramer multiple-comparison tests were used for data analysis at α=0.05. ResultsAging process for all groups showed significant differences in TS between unreinforced and nano-ZrO2 reinforced groups (p<0.05). Within immersed nano-ZrO2-reinforced specimens, 5% group immersed for 30-days showed the highest significant TS value (p<0.05). With regards to thermocycling, 5% group showed the highest TS values after 2-days and 30-days groups while after 7-days, significant differences were found between 2.5% group and 5% and 7.5% groups (p<0.05). SEM images analysis displayed the ductile fracture type for nano-ZrO2 reinforced groups. ConclusionsIn summary, 5.0%-nano-ZrO2 addition to repair resin showed an improvement in tensile strength of repaired acrylic resin with different aging processes. Key words:Acrylic resins, denture repair, tensile strength, thermocycling, water storage, zirconium oxide nanoparticle.
Highlights
(methyl methacrylate) (PMMA) has been used as the most common material for the fabrication of removable dentures due to their favorable characteristics, ease of handling and pleasing aesthetics
Thermal cycling is an in-vitro procedure to simulate the conditions of oral cavity, in which tested materials are exposed to alternating extreme temperatures using thermally controlled water baths
To the authors’ knowledge, the effects of water immersion and thermal stressing have not been previously reported. This in-vitro study aimed to evaluate the effects of water immersion and thermal cycling on repaired denture base using repair material reinforced with different concentrations of nano-ZrO2
Summary
(methyl methacrylate) (PMMA) has been used as the most common material for the fabrication of removable dentures due to their favorable characteristics, ease of handling and pleasing aesthetics. ZrO2 nanoparticle (nano-ZrO2) is a metal oxide that is biocompatible, has good mechanical strength and favorable surface properties making it a suitable acrylic reinforcing material, including repair resin of denture bases [7,8]. To the authors’ knowledge, the effects of water immersion and thermal stressing have not been previously reported This in-vitro study aimed to evaluate the effects of water immersion and thermal cycling on repaired denture base using repair material reinforced with different concentrations of nano-ZrO2. The purpose of this study was to evaluate the effect of aging process on the tensile strength (TS) of repaired acrylic denture base using ZrO2 nanoparticles (nano-ZrO2)-reinforced autopolymerized resin. Conclusions: In summary, 5.0%-nano-ZrO2 addition to repair resin showed an improvement in tensile strength of repaired acrylic resin with different aging processes
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