Influence of Al2O3 as Filler Loading on the Fracture Toughness of Light-Cured Dental Resin Composites

The purpose of the present study was to evaluate the effect of filler loading on the fracture toughness of light-cured dental resin composites (DRCs). The monomer Bis-GMA and TEGDMA (75/25 wt/wt) were mixed with treated micro-sized aluminum oxide (Al2O3) particles ranging from 40-60 wt% as filler. The composite samples were cured with LED for 80s. The bulk density (g/cm3) and apparent porosity (%) of the samples were determined according to the ASTM standard. The fracture toughness (KIC) values of the composites were determined using a single edge notched specimen in the three-point bending test. There was a significant difference in KICof the composites with different loading of Al2O3particles (p< 0.05). The highest amount of filler (60 wt%) reduced the KICvalue to 1.5 MPa.m1/2. As a conclusion, the Al2O3particles used as filler loading does have an effect on the mechanical properties of DRCs.

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Assessment of Fracture Toughness Using Small Punch Tests of Prenotched Specimens

Journal of Pressure Vessel Technology ◽

10.1115/1.4037046 ◽

2017 ◽

Vol 139 (5) ◽

Cited By ~ 1

Author(s):

Yangyan Zheng ◽

Xiao Chen ◽

Zheng Yang ◽

Xiang Ling

Keyword(s):

Fracture Toughness ◽

Numerical Simulations ◽

Stress Gradient ◽

Element Model ◽

Bending Test ◽

J Integral ◽

Notched Specimen ◽

Small Punch ◽

Three Point Bending ◽

The Difference

In this paper, line- and ring-notched small punch test (SPT) specimens were studied; a three-dimensional (3D) model of a ring-notched SPT specimen was established using the contour integral method, and the validity of the model was verified using ring-notched specimens. The stress and strain fields were analyzed using numerical simulations of a ring-notched SPT specimen, and the change in the stress gradient during deformation was considered. To verify the finite element model, the results of the numerical simulations were compared with those of three-point bending tests and a Gurson–Tvergaard–Needleman (GTN) model. Compared with the line-notched specimen, the ring-notched specimen was more suitable for notch propagation analysis and fracture toughness evaluation. The results of the numerical simulations were in good agreement with those of the experiments, which showed that the numerical model used in this study was correct. For a notch that initiated when the load reached its maximum value, the value of the J integral was 335 × 10−6 kJ/mm2, and at time 0.85Pmax, the value of the J integral was 201 × 10−6 kJ/mm2, and the difference from the result of the three-point bending test was 14.4%. For a notch that initiated during the stretching deformation stage, the relevant fracture toughness was 225 × 10−6 kJ/mm2, and the difference from the result of the three-point bending test was 3%.

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Effect of Modification of Aluminum Borate Whiskers with Three Methods on Flexural Properties of Dental Resin Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.364.687 ◽

2013 ◽

Vol 364 ◽

pp. 687-691

Author(s):

Yan Bo Yuan ◽

Xing Xing Li ◽

Wen Yun Zhang ◽

Qing Hua Chen ◽

Yu Hong Xiao ◽

...

Keyword(s):

Flexural Strength ◽

Sol Gel ◽

Flexural Properties ◽

Resin Composites ◽

Dental Resin ◽

Dental Resin Composites ◽

Aluminium Borate ◽

Significant Difference ◽

Group A ◽

Group B

This study aimed to compare three different methods for the modification of aluminium borate whiskers and investigate the effect of aluminium borate whiskers composites on flexural properties of dental resin composites. Method A was to mix aluminium borate whiskers and silicon dioxide (SiO2) nanoparticles directly. Method B was to modify the mixture of aluminium borate whiskers and SiO2nanoparticles with sol-gel process of tetraethoxysilane (TEOS). Method C was to modify the aluminium borate whiskers with SiO2nanoparticles which were repaired by sol-gel method of TEOS. The effects of the three methods were characterized by the TEM and SEM. There was a significant difference (p<0.05) in the flexural strength among three methods. Group C had a flexural strength of 149.59 ± 12.86 MPa (mean ± SD; n = 5), which is significantly higher than 95.28 ± 4.53 MPa for Group A and 123.14 ± 17.37 MPa for Group B. It is concluded that ceramic whisker reinforcement significantly improves the flexural properties of resin composites; different methods produce different effects.

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Simulated Body Fluid Sorption and Solubility of Silica Reinforced Dental Resin Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.795.626 ◽

2013 ◽

Vol 795 ◽

pp. 626-630 ◽

Cited By ~ 1

Author(s):

Saad Omar Alsharif ◽

Md Akil Hazizan ◽

Nasser Abbas Abd El-Aziz ◽

Zainal Arifin Ahmad

Keyword(s):

Simulated Body Fluid ◽

Body Fluid ◽

Resin Composite ◽

Triethylene Glycol ◽

Filler Loading ◽

Resin Matrix ◽

Resin Composites ◽

Dental Resin ◽

Triethylene Glycol Dimethacrylate ◽

Dental Resin Composites

The aim of this study is to investigate the effect of filler loading on the sorption and solubility of Simulated Body Fluid (SBF) of self-prepared micro dental resin composites. The prepared resin composite was based on silica (SiO2) particles and bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base monomer and triethylene glycol dimethacrylate (TEGDMA) as a co-monomer. The filler was mixed with monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the sorption and solubility of SBF. The experimental methods were based on the procedure mentioned in the ISO 4049 (2009) standard for dentistry-Polymer-based restorative Materials. The sorption and solubility of resin matrix/SiO2composite decreased gradually as the filler loading increased. The increase of filler loading showed significant differences in the sorption and solubility as tested by ANOVA (P= 0.000).

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Bitumen and bituminous binders. Determination of the fracture toughness temperature by a three point bending test on a notched specimen

10.3403/30267138u ◽

2015 ◽

Keyword(s):

Fracture Toughness ◽

Bending Test ◽

Notched Specimen ◽

Three Point Bending ◽

Bituminous Binders

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Dental resin composites containing silica-fused whiskers—effects of whisker-to-silica ratio on fracture toughness and indentation properties

Biomaterials ◽

10.1016/s0142-9612(01)00178-8 ◽

2002 ◽

Vol 23 (3) ◽

pp. 735-742 ◽

Cited By ~ 57

Author(s):

Hockin H.K. Xu ◽

Janet B. Quinn ◽

Douglas T. Smith ◽

Joseph M. Antonucci ◽

Gary E. Schumacher ◽

...

Keyword(s):

Fracture Toughness ◽

Resin Composites ◽

Dental Resin ◽

Dental Resin Composites ◽

Silica Ratio

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Influence of Silica and Zirconia Particles as Filler Loading on the Radiopacity of Dental Resin Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.620.345 ◽

2012 ◽

Vol 620 ◽

pp. 345-349 ◽

Cited By ~ 2

Author(s):

Saad Omar Alsharif ◽

Md Akil Hazizan ◽

Nasser Abbas Abd El-Aziz ◽

Zainal Arifin Ahmad

Keyword(s):

Glycidyl Methacrylate ◽

Triethylene Glycol ◽

Filler Loading ◽

Aluminum Plate ◽

Resin Matrix ◽

Resin Composites ◽

Dental Resin ◽

Triethylene Glycol Dimethacrylate ◽

Dental Resin Composites ◽

Base Resin

The aim of this study is to evaluate the radiopacity of silica (SiO2) and zirconia (ZrO2) particles dispersed in a bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base resin and triethylene glycol dimethacrylate (TEGDMA) as a diluent. The fillers were mixed separately with bis-GMA/TEGDMA monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the radiopacity. Samples of the composites with 2.5 mm thickness were compared their radiopacity with the same thickness of the standard aluminum plate. The radiopacity of both resin matrix/SiO2and resin matrix/ZrO2composites increased gradually as the filler loading increased. The resin matrix/ZrO2composites possessed radiopacity higher than the standard aluminum plate. The increase of filler loading showed highly significant differences in the radiopacity as tested by ANOVA (P= 0.000).

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