Effects of coating with different ceromers on the impact strength, transverse strength and elastic modulus of polymethyl methacrylate

Gül, Esma Başak; Atala, Mustafa Hayati; Eşer, Bekir; Polat, Nilüfer Tülin; Asiltürk, Meltem; Gültek, Ahmet

doi:10.4012/dmj.2014-203

Cited by 8 publications

(11 citation statements)

References 44 publications

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“…ZrO 2 volume expansion due to the phase transformation may cause microcracks on the APTES-coated surface of nano-ZrO 2 (25). In the current study, the flexural strength test specimens were stored in distilled water prior to the three-point bending test for 50 ± 2 h; these microcracks absorbed the water during the procedure.…”

Section: Discussionmentioning

confidence: 99%

The effects of adding various ratios of zirconium oxide nanoparticles to poly(methyl methacrylate) on physical and mechanical properties

Ergün

Şahin

Ataol

2018

Journal of Oral Science

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Abstract:The aim of the present study is to evaluate the transverse strength, modulus of elasticity, surface roughness, hardness, and water sorption/solubility of nanoparticle zirconium oxide (nano-ZrO 2 ) added to heat-cured poly(methyl methacrylate) (PMMA) after thermocycling. The specimens were divided into four groups according to the ratio of nano-ZrO 2 addition to heat-cured PMMA; group 1: 5% nano-ZrO 2 ; group 2: 10% nano-ZrO 2 ; group 3: 20% nano-ZrO 2 , and group 4 (control): PMMA without nano-ZrO 2 . A statistically significant decrease in transverse strength was observed by all additional rates of nanoZrO 2 compared with group 4 (control; P < 0.025). When hardness results were evaluated, groups 1 and 2 showed statistically higher values compared with groups 3 and 4 (P < 0.025). The surface roughness of group 3 was statistically higher than the other groups (P < 0.025), but it was within the clinically acceptable limits. As the nano-ZrO 2 addition rate increased, water sorption/solubility values of the specimens also increased. Although nano-ZrO 2 addition had an adverse effect on some mechanical and physical properties of heat-cured PMMA, it increased hardness values, implying that the addition of nano-ZrO 2 would contribute positively to some mechanical properties of PMMA denture base material when nano-ZrO 2 was homogeneously distributed in PMMA.

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Section: Discussionmentioning

confidence: 99%

The effects of adding various ratios of zirconium oxide nanoparticles to poly(methyl methacrylate) on physical and mechanical properties

Ergün

Şahin

Ataol

2018

Journal of Oral Science

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“…This could have probably been caused by specific conditions to which the materials were subjected. The flexural strength test specimens were stored in distilled water for 50 ± 2 h at 37 • C. The flexural strength reduction effect is likely due to tetragonalto-monoclinic phase transformation of ZrO 2 [43]. During this process, ZrO 2 changed its volume causing microcracks in the silane layer [43].…”

Section: General Interpretation Of the Resultsmentioning

confidence: 99%

The Effect of Zirconium Dioxide (ZrO2) Nanoparticles Addition on the Mechanical Parameters of Polymethyl Methacrylate (PMMA): A Systematic Review and Meta-Analysis of Experimental Studies

et al. 2022

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The number of studies on the subject of effects of zirconium dioxide (ZrO2) nanoparticles addition on the mechanical parameters of polymethyl methacrylate (PMMA) is still very limited. Therefore, in this research, the authors wanted to assess PMMA modified with the nano-ZrO2 additive in terms of changes in flexural, impact and tensile strength values in relation to PMMA without such component. A systematic review and meta-analysis were performed to evaluate the effect of incorporating nano-ZrO2 into PMMA on individual types of material strength. The obtained numerical data were tabulated and analyzed in the search for percentage changes in those parameters. It was then calculated for each set and the procured model was examined using residual sum of squares (RSS) to assess the discrepancy between the data and the estimation model whilst mean absolute deviation (MAD) was employed to determine robustness. The results of the systematic review were composed of data obtained from individual studies presented in eight independent articles. Overall, the addition of nano-ZrO2 increases the flexural strength of the composite with the PMMA matrix depending on the size of the ZrO2 grains administered. Unfortunately, these conclusions are based on a very limited amount of research and require further verification, especially regarding tensile strength.

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“…The degradation that takes place in the restorations, whether these are composite resins or composite resins reinforced with ceramic particles, is because, when in contact with water (and, in the case of the oral cavity, with saliva), the diffusion of water molecules occurs in the polymer matrix, which degrades the siloxane bonds, compromising the physical and mechanical properties of the material. This produces a decrease in the hardness and modulus of elasticity of the restorations over time [6,28].…”

Section: Discussionmentioning

confidence: 99%

Mechanical and Tribological Characterization of a Dental Ceromer

Santos

Coelho

Paula

et al. 2020

JFB

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Background: Indirect restorations using composites with ceramic fillings can be an alternative to ceramic veneering and direct composite restorations for the treatment of posterior teeth. The aim of this study was the evaluation of the mechanical and tribological properties of a ceromer. Materials and Methods: Sixty specimens were produced and divided into two groups: one control group not submitted to thermocycling (n = 20) and one test group submitted to 5000 cycles of thermocycling (n = 40). The studied parameters were microhardness, surface roughness and the coefficient of friction (scratch test). Results: The ceromer exhibits a reduction of polymerization shrinkage, higher wear, and fracture resistance than the composite resins. The studied ceromer presented good mechanical properties, even after being submitted to thermocycling. Roughness was the property most affected, increasing 25.8%, microhardness decreased by 10.5% and the coefficient of friction increased by 4.2%. Conclusions: In certain situations, ceromers can be an alternative to composite resins and ceramics, providing an aesthetic, conservative and longevity option.

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Effects of coating with different ceromers on the impact strength, transverse strength and elastic modulus of polymethyl methacrylate

Cited by 8 publications

References 44 publications

The effects of adding various ratios of zirconium oxide nanoparticles to poly(methyl methacrylate) on physical and mechanical properties

The effects of adding various ratios of zirconium oxide nanoparticles to poly(methyl methacrylate) on physical and mechanical properties

The Effect of Zirconium Dioxide (ZrO2) Nanoparticles Addition on the Mechanical Parameters of Polymethyl Methacrylate (PMMA): A Systematic Review and Meta-Analysis of Experimental Studies

Mechanical and Tribological Characterization of a Dental Ceromer

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