Comparison of Different Bleaching Treatments Effect on Micro Hardness of Four Different Aged Composites

Kazemi, Ali; Johar, Najmeh

doi:10.17795/jjhr-39039

Cited by 3 publications

(9 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The resin matrix of the Valux Plus product contains Bisphenol A Diglycidyl Ether Dimethacrylate (BISGMA), Triethylene Glycol Dimethacrylate (TEGDMA) and silane treated ceramic, which are considered vulnerable to staining due to their increased hydrophilicity [20,21]. These composites have zirconia/silica fillers [22,23], which may have a porosity that facilitates colourant penetration. These results are in agreement with previous studies that have reported that products that contain similar components in the matrix and fillers, as in Valux Plus, were prone to staining and discolouration [8].…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have reported that the filler fraction for Gradia Direct is 73% by weight (64% by volume), containing silica and pre-polymerized fillers (average particle size 0.85 µm), and for Valux-Plus, it is 85% by weight (66% by volume), containing zirconiasilica fillers (particle size 0.6-1 µm) [22,23]. In this study, microhardness values for Gradia Direct samples were found to be significantly lower than for Valux Plus samples.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Vegetable Juices on Properties of Two Resin Composites Used for Dental Caries Management

et al. 2023

View full text Add to dashboard Cite

Background and Objectives: Resin composites represent a class of materials widely used in restorative dentistry due to patient demands for better aesthetics. Colour changes in composite resins can occur due to intrinsic and extrinsic factors. Beverages, such as vegetable juices, can be some of these extrinsic factors. The purpose of this study was to investigate the colour stability and modification of microhardness of two resin composites before and after immersion in different vegetable juices. Materials and Methods: The colour of two resin composite materials (Gradia Direct Anterior-shade A2 and Valux Plus—shade A2) was measured before and after immersion in four different solutions: distilled water (as control), beetroot, carrot, and tomato juice. Colour values (L *, a *, b *) were measured over a white background with a colorimeter, using the CIE L *a *b * system. Colour change values were calculated after 1, 3, 5, and 7 days of immersion. Microhardness measurements were taken before and after seven days immersion in test media. Repeated measures analysis of variance (ANOVA) and independent t-tests were applied for statistical analysis. Results: All vegetable juices produced statistically different discolouration after immersion for 7 days (p < 0.05). Tomato juice produced the most discolouration for the Gradia Direct specimens, whereas beetroot juice and carrot juice produced the most discolouration for the Valux Plus specimens. Microhardness of the materials immersed for 7 days in vegetable juices was reduced compared to the ones immersed in distilled water. Conclusions: Vegetable juices, immersion time, and dental resin composites are significant factors that may affect colour stability and microhardness of composite resins.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Vegetable Juices on Properties of Two Resin Composites Used for Dental Caries Management

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Microhardness is indicated by the resistance of a surface to penetration or permanent indentation. Microhardness is critical to the wear rate and clinical repair durability [ 41 ]. Surface hardness directly affects a material’s ductility, elasticity, toughness, and visco-elasticity.…”

Section: Discussionmentioning

confidence: 99%

“…Micro-filled composite materials with particles of pre-polymerized organic filler and a high proportion of organic constituents are exceptions [ 22 ]. Pre-polymerized organic fillers have lower hardness than silica fillers and contain an organic component [ 41 ]. Therefore, in the current study, the reduction in the microhardness values could be mainly associated with an increase in the concentration of organic XL-BisGMA particles because of the organic nature of the filler [ 50 ].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, in the current study, the reduction in the microhardness values could be mainly associated with an increase in the concentration of organic XL-BisGMA particles because of the organic nature of the filler [ 50 ]. The reduction in microhardness may be a clinical limitation for the XL-BisGMA resin composites because many properties of the dental composites are related to microhardness, including wear resistance, plaque accumulation, and durability [ 41 ]. However, with further modifications and combination with other fillers, the microhardness could be increased.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of Novel Pre-Polymerized BisGMA/Silica Nanocomposites: Physio-Mechanical Considerations

Alrahlah

Khan

Al-Odayni

et al. 2023

JFB

View full text Add to dashboard Cite

Resin composite mimics tooth tissues both in structure and properties, and thus, they can withstand high biting force and the harsh environmental conditions of the mouth. Various inorganic nano- and micro-fillers are commonly used to enhance these composites’ properties. In this study, we adopted a novel approach by using pre-polymerized bisphenol A-glycidyl methacrylate (BisGMA) ground particles (XL-BisGMA) as fillers in a BisGMA/triethylene glycol dimethacrylate (TEGDMA) resin system in combination with SiO2 nanoparticles. The BisGMA/TEGDMA/SiO2 mixture was filled with various concentrations of XL-BisGMA (0, 2.5, 5, and 10 wt.%). The XL-BisGMA added composites were evaluated for viscosity, degree of conversion (DC), microhardness, and thermal properties. The results demonstrated that the addition of a lower concentration of XL-BisGMA particles (2.5 wt.%) significantly reduced (p ≤ 0.05) the complex viscosity from 374.6 (Pa·s) to 170.84. (Pa·s). Similarly, DC was also increased significantly (p ≤ 0.05) by the addition of 2.5 wt.% XL-BisGMA, with the pristine composite showing a DC of (62.19 ± 3.2%) increased to (69.10 ± 3.4%). Moreover, the decomposition temperature has been increased from 410 °C for the pristine composite (BT-SB0) to 450 °C for the composite with 10 wt.% of XL-BisGMA (BT-SB10). The microhardness has also been significantly reduced (p ≤ 0.05) from 47.44 HV for the pristine composite (BT-SB0) to 29.91 HV for the composite with 2.5 wt.% of XL-BisGMA (BT-SB2.5). These results suggest that a XL-BisGMA could be used to a certain percentage as a promising filler in combination with inorganic fillers to enhance the DC and flow properties of the corresponding resin-based dental composites.

show abstract

Advancing Dimethacrylate Dental Composites by Synergy of Pre-Polymerized TEGDMA Co-Filler: A Physio-Mechanical Evaluation

Alrahlah,

Khan,

Al-Odayni

et al. 2023

Biomimetics

View full text Add to dashboard Cite

Dental resin composites (DRCs) have gained immense popularity as filling material in direct dental restorations. They are highly valued for their ability to closely resemble natural teeth and withstand harsh oral conditions. To increase the clinical performance of dental restorations, various fillers are incorporated into DRCs. Herein, the effect of incorporating pre-polymerized triethylene glycol dimethacrylate (P-TEGDMA) as a co-filler in varying proportions (0%, 2.5%, 5%, and 10% by weight) into bisphenol A-glycidyl methacrylate (BisGMA)/TEGDMA/SiO2 resin composite was investigated. The obtained DRCs were examined for morphology, rheological properties, degree of crosslinking (DC), Vickers microhardness (VMH), thermal stability, and flexural strength (FS). The results revealed that SiO2 and P-TEGDMA particles were uniformly dispersed. The introduction of P-TEGDMA particles (2.5 wt.%) into the resin composite had a remarkable effect, leading to a significant reduction (p ≤ 0.05) in complex viscosity, decreasing from 393.84 ± 21.65 Pa.s to 152.84 ± 23.94 Pa.s. As a result, the DC was significantly (p ≤ 0.05) improved from 61.76 ± 3.80% to 68.77 ± 2.31%. In addition, the composite mixture demonstrated a higher storage modulus (G′) than loss modulus (G″), indicative of its predominantly elastic nature. Moreover, the thermal stability of the DRCs was improved with the addition of P-TEGDMA particles by increasing the degradation temperature from 410 °C to 440 °C. However, the VMH was negatively affected. The study suggests that P-TEGDMA particles have the potential to be used as co-fillers alongside other inorganic fillers, offering a means to fine-tune the properties of DRCs and optimize their clinical performance.

show abstract

Comparison of Different Bleaching Treatments Effect on Micro Hardness of Four Different Aged Composites

Abstract: Background: In this study, four different types of composite samples were aged then exposed to 16% carbamide peroxide and 40% hydrogen peroxide, and the results were compared to a control group.

Cited by 3 publications

References 28 publications

Effect of Vegetable Juices on Properties of Two Resin Composites Used for Dental Caries Management

Effect of Vegetable Juices on Properties of Two Resin Composites Used for Dental Caries Management

Fabrication of Novel Pre-Polymerized BisGMA/Silica Nanocomposites: Physio-Mechanical Considerations

Advancing Dimethacrylate Dental Composites by Synergy of Pre-Polymerized TEGDMA Co-Filler: A Physio-Mechanical Evaluation

Contact Info

Product

Resources

About