The reinforcement effect of nano and microfillers on fracture toughness of two provisional resin materials

Yılmaz, Caner; Korkmaz, Turan

doi:10.1016/j.matdes.2006.05.029

Cited by 39 publications

(26 citation statements)

References 17 publications

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“…The Effect of Nano-ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength (97) result was in agreement with other studies (9,17) as it was proved that reinforcement of denture base resin with ZrO 2 nano-fillers powder results in an increase in its flexural strength (37,43) .…”

Section: Flexural Strengthsupporting

confidence: 88%

“…Increase in impact strength is required to prevent the fracture of denture resulting from its accidental fall, while transverse strength helps to withstand higher flexural stresses developed during mastication (6,7,8,9) . Denture base materials are subjected to compressive, tensile, and shear stresses during function, and fractures in the denture base may develop through repeated masticatory forces or high impact forces that may occur as a result of dropping the prosthesis (2,10) .…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

Al-Mahdy

Eltayeb

2018

ADJ-for Girls

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Purpose: This study was conducted to evaluate the effect of rein forcement of different concentrations of nano-ZrO 2 and nano-Al 2 O 3 on the flexural strength and impact strength of repaired acrylic resin denture bases. Materials and Methods: A total of 100 specimens were prepared from heat-polymerized acrylic resin and then they were equally divided for the flexural and impact strength tests. 50 specimens were assigned for each testing group. For the flexural strength testing, metallic rectangular molds with rectangular-shaped (65 mm length x10 mm width x 2.5 mm thickness) were prepared. While specimens for the impact strength testing were prepared using rectangular-shaped molds with dimensions of (50 mm length x6mm width x4mm thickness). The prepared intact specimens were cut vertically in two halves along their long axis. For the flexural and impact strength testing, a repair gap was done. Specimens for each strength test were divided into one control group (specimen repaired with autopolymerizing acrylic resin with no fillers) and two repair groups with 2 concentrations (2% and 5%) of nano-ZrO 2 fillers and two repair groups with 2 concentrations (2% and 5%) of nano-Al 2 O 3 fillers. Flexural strength was measured using an Instron mechanical testing machine and impact strength was measured by Izod impact tester. Results: For the flexural strength results, the highest flexural strength was recorded with the 5% nano-ZrO 2 fillers repair group followed by the 2% nanoZrO 2 group which also recorded higher significant mean value than the control group. In both nano-Al 2 O 3 groups, there was a highly significant reduction in the flexural strength for both concentrations. For the impact strength results, the highest impact strength was recorded for the 2% nanoZrO 2 fillers repair group followed by the 5% nano-ZrO 2 group which also recorded higher significant mean values than the control group. In the 2% nano-Al 2 O 3 repair group, there was a non-significant difference in the impact strength mean values compared with the control group. While the repair group reinforced with 5% nano-Al 2 O 3 showed significant reduction in impact strength. Conclusions:The incorpora tion of nano-ZrO 2 into repair resins may improve the flexural and impact strength of the repaired denture base whereas nano-Al 2 O 3 caused reduction of both strengths.

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Section: Flexural Strengthsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

Al-Mahdy

Eltayeb

2018

ADJ-for Girls

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“…The experiment data provided by previous researches suggest that the filler plays an important role in some properties such as elastic modulus [11], polish retention [12]- [14], wear resistance [14], flexural strength [14]- [17], bond strength [18], color stability, translucency, opalescence [19] and fracture toughness [14], [20], [21]. Also, some other studies have shown the effects of filler size [8], [9], [22], [23] and filler shape [11], [20] on mechanical properties of dental composites.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Karimzadeh¹,

Ayatollahi²,

Shirazi³

2014

IJMMM

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Abstract-The aim of this study was to evaluate the influence of thermocycling on the mechanical properties of a commercial dental nanocomposite by using the nano-indentation experiment. The resin-based nanocomposite contained silica and zirconia nanofillers. Some disk specimens, each with the diameter of 10 mm and the thickness of 4 mm were prepared and the specimens were stored at various environmental conditions. Some of the samples were kept in the ambient condition, other samples were stored in distilled water at room temperature and other ones were thermocycled in distilled water for 1000 cycles between 5°C and 55°C. After preparation of samples, the nano-indentation test was applied on the prepared specimens by Triboscope setup. Then the modulus of elasticity and hardness of the test samples were calculated from the Oliver-Pharr's method using the data obtained from nano-indentation test. The present research showed that the samples stored in distilled water without thermocycling exhibited the highest elasticity modulus when compared to the other samples. In addition, the maximum hardness was observed for thermocycled specimens in distilled water.

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“…Fracture toughness tests were performed on Lloyd universal testing machine (model LRX plus II, Fareham, England) with a cross-head speed of 1mm/min, and peak load to fracture was recorded. The recorded data were used to determine the fracture toughness (K Ic ) in MPa.m 1/2 according to the "equation 2" [17] :…”

Section: Fracture Toughnessmentioning

confidence: 99%

Effect of Zirconium Oxide Nano-Fillers Addition on Mechanical Properties of Heat-Polymerized Acrylic Resin

Serry

Ebrahim

2016

ADJ-for Girls

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One way analysis of variance (ANOVA) and Tukey's tests were used for testing the significance between the means of tested groups which are statistically significant when the P value ≤ 0.05. Results: Addition of Zirconium oxide nanofillers to PMMA significantly increased the flexural strength, fracture toughness and hardness. Conclusion:These results indicate that Zirconium oxide nanofillers added to PMMA has a potential as a reliable denture base material with increased flexural strength, fracture toughness, and hardness. According to the results of the present study, the best mechanical properties were achieved by adding 7%wt ZrO 2 concentration.

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The reinforcement effect of nano and microfillers on fracture toughness of two provisional resin materials

Cited by 39 publications

References 17 publications

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Effect of Zirconium Oxide Nano-Fillers Addition on Mechanical Properties of Heat-Polymerized Acrylic Resin

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