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

Karimzadeh, A.; Ayatollahi, M.R.; Shirazi, Hadi Asgharzadeh

doi:10.7763/ijmmm.2014.v2.102

Cited by 19 publications

(19 citation statements)

References 57 publications

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“…The materials used to restore teeth must have enough strength to resist again applied forces during chewing and remain strongly on the related part of the teeth. (4) Nanocomposites have shown physical properties comparable to or better than those of later generation microhybrid composite and significant improvement in surface smoothness/polish retention compared to conventional microfills. Nanofilled resin-modified glass ionomer demonstrated the least microleakage and proved to be better than the conventional and resin-modified glass ionomer cements, consequently it reduces hypersensitivity of restored tooth, tooth discoloration, recurrent caries, pulpal injury and deterioration of the restorative material.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Some Common Children’s Drinks on Color Stability of Nanocomposite and Nanoglass Ionomer

2016

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The purpose of this study was to evaluate the effect of some common children's drinks on color stability of nanocomposite and nanoglass ionomer. A hundred test specimens of two restorative materials (Filtek Z350; 3M and Ketac N100; 3M were prepared using a Teflon mold (8x2 mm). Baseline measurements of color and surface roughness of each specimen were made and specimens (n=10) were immersed in 5 groups: G1: orange juice, G2: guava juice, G3: Strawberry milk; G4: Chocolate milk, and G5: Distilled water (control. Final measurements of color and surface roughness were performed and the results submitted to statistical analysis (2-way ANOVA, p<0.05). Their was no statisically significant difference between mean color change for both materials and the most significant color change was observed for specimens when immersed in orange juice (p<0.05). With regard to roughness, nanoglass ionomer showed the most significant changes when immersed in orange juice (p<0.05). It was concluded that color changes were dependent on the immersion media rather than the material used while surface roughness was dependent on both material type and immersion media.

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Section: Introductionmentioning

confidence: 99%

The Effect of Some Common Children’s Drinks on Color Stability of Nanocomposite and Nanoglass Ionomer

2016

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“…Thermal stresses generated due to thermal gradient in thermocycling process among structural constitutions of composites. 16 Thermocycling is an experimental process to simulate the real oral thermal conditions. The temperature changes induced by alternate intake of hot and cold foods may contribute to failure of composites resins by affecting cohesion.…”

Section: Discussionmentioning

confidence: 99%

Effect of Thermocycling on Microhardness of Two Nanohybrid and One Microhybrid Composites Cured at Different Durations: An in vitro Study

Pillai¹,

Varghese²,

Sujathan³

et al. 2017

Conservative Dentistry and Endodontic Journal

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Aim:The aim of this study was to evaluate the effect of thermocycling on microhardness of three composites cured at different durations. Materials and methods:One hundred and twenty disks (N = 120) were made with a dimension of 5 mm diameter and 2 mm height using a metal mold from three composites (Filtek Z350 XT, Tetric N Ceram, Z100 Universal Restorative). Forty disks each were made with each composite, which were again divided into two subgroups according to the duration of curing, 20 and 40 seconds. Microhardness test was done before and after thermocycling using Vickers microhardness test. Thermocycling was done at -5 and at 55°C for 250 cycles. Values were analyzed using analysis of variance (ANOVA) test, Tukey's simultaneous comparison.Results: Among the groups cured for 40 seconds, in the control group, Z100 restorative showed higher microhardness. After thermocycling, even though there was a significant reduction in microhardness in all three composites, Tetric N Ceram showed minimal change in values compared with the other two composites. Conclusion:It was concluded that after thermocycling, the composite resins are susceptible to significant reduction in microhardness.Clinical significance: Patient's oral conditions, such as the cyclic thermal gradient and humidity can have negative effects on the mechanical properties of restorative materials. This is one of the factors contributing to a future need for replacement of dental restorative materials.

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“…To obtain a smooth and glossy surface, all specimens were ground with 400-2500 grit sandpaper and then polished by diamond pastes with mesh sizes of 1 and 0.5 microns (fig 4). All specimens were thermocycled as mentioned before, and then maintained at an ambient temperature of 24°C for 1h before applying the test using Once the pre-set maximum value was reached, the normal load was decreased until partial or complete relaxation has taken place (34) . At least each specimen was subjected to 15-cycle nanoindentations located 25 μm away from each other and the mean microhardness values were recorded (35) .…”

Section: Nanoindentation Testingmentioning

confidence: 99%

Antibacterial and Mechanical Assays of Resin Modified Glass Ionomer Containing Propolis Extract

Beltagy¹,

Abd-Elmonsef²

2018

Egyptian Dental Journal

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The antibacterial efficacy of restorative materials had an important role in preventing the recurrent caries. The objective of this study was to evaluate in-vitro the antibacterial and mechanical assays of Vitremer containing ethanolic extract of propolis (EEP). Materials and methods: I-Antibacterial Assay: The standard strain of Streptococcus mutans and Lactobacillus acidophilus were used for determination of minimum inhibitory concentration (MIC) of EEP/Vitremer. II-Mechanical Assay: A-Shear bond strength (SBS): sixty half-crowns of non-carious extracted 2 nd primary molars were placed at standard moulds containing Teflon disc that had 4mm x 3mm central hole and divided into 4 groups (n=15) according to the different EEP concentrations. Group I: 10%, group II: 25%, group III: 50% EEP-Vitremer mixture, and group IV (control): 0% EEP/ Vitremer and SBS was assessed using Instron machine. B-Microhardness: Sixty standard discshaped specimens were prepared from mixture 0%, 10%, 25%, and 50%, n=15 and nanoindentation value was recorded. Data were analyzed using one-way ANOVA and post-hoc test. Results: Only MIC of 10%, 25%, and 50% mixture showed growth inhibition against S. mutans, compared to 25% and 50% against L. acidophilus. SBS showed that 0% EEP recorded the highest value followed by10% mixture but the difference was not significant (p>0.05), while 25% and 50% reported the lowest values and the differences were significant (p< 0.05). 25% and 50% mixtures recorded the highest significant microhardness (p<0.05). 0% EEP and 10% mixtures displayed no significant differences between them (P>0.05). Conclusions: 25% EEP-Vitremer mixture was the most suitable concentration as it exhibits positive significant antibacterial and mechanical assays.

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

Cited by 19 publications

References 57 publications

The Effect of Some Common Children’s Drinks on Color Stability of Nanocomposite and Nanoglass Ionomer

The Effect of Some Common Children’s Drinks on Color Stability of Nanocomposite and Nanoglass Ionomer

Effect of Thermocycling on Microhardness of Two Nanohybrid and One Microhybrid Composites Cured at Different Durations: An in vitro Study

Antibacterial and Mechanical Assays of Resin Modified Glass Ionomer Containing Propolis Extract

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