Effect of water storage on flexural strength of silorane and methacrylate-based composite resins

Panahandeh, Narges; Torabzadeh, Hassan; Naderi, Hani; Sheikh-Al-Eslamian, Seyedeh Mahsa

doi:10.5395/rde.2017.42.4.309

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…[16–18] In a next step, hydrolysis or hydration of siloxane bonds of the silane layer will occur due to the degradation of matrix-filler bonds; surface or internal cracks and porosity would facilitate water access to this interface. [13, 19] Finally, there could be solubilization of the particles by releasing ions of the components [20, 21] and the presence of other solvents, lubricants, electrolytes, or enzymes, [15, 21, 22] along with mechanical cycling that would accelerate the process, occurs. According to this analysis, silane plays an important role as a binding agent in the chemical and mechanical stability of these materials.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil

Ricci

Alfano

Pamato

et al. 2019

BioMed Research International

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A significant deterioration of the properties can drastically compromise the survival rate of restorative materials. The aim of this study was to assess flexural strength and hardness of three composite classes: hybrid composite resin (HCR), nanoparticulate composite resin (NCR), and silorane-based composite resin (SBCR). One hundred specimens were prepared for hardness testing by using a split metallic mold measuring 10 mm in diameter and 2 mm deep. Twenty specimens were prepared for each restorative material, randomly assigned for storage in air, distilled water, or mineral oil. After intervals of 24 hours, 30, 60, 90, and 120 days, hardness and flexural strength tests were initially compared in two levels: “storage medium” and “time” within each material group. A two-way analysis of variance was performed (p<0.05) on the variables “material” and “storage time” (p<0.05). The HCR showed to be stable with regard to the evaluation of flexural strength and hardness (p<0.05). A significant reduction occurs for the NCR in comparison to the other groups (p<0.05). The NCR presented the lowest values of hardness and flexural strength kept on water over time. The characteristics of material showed a strong influence on the decrease of the mechanical properties analyzed.

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Section: Resultsmentioning

confidence: 99%

Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil

Ricci

Alfano

Pamato

et al. 2019

BioMed Research International

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“…However, the flexural strength decreased significantly in most groups, which was consistent with many previous studies. For example, studies of various low shrinkage commercial composites found that the flexural strength was significantly reduced after 6 months and 1 year of water aging [10,33]. Oliveira used a mechanical loading chewing simulator to test the mechanical properties of the 3M350 composite and bulk-fill composite after 5 years of use.…”

Section: Discussionmentioning

confidence: 99%

Effects of Bio-Aging on Mechanical Properties and Microbial Behavior of Different Resin Composites

et al. 2023

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Under challenging oral environments, the overall performance of resin composites is affected by bio-aging. This study investigated the effects of saliva biofilm-induced bio-aging on the mechanical properties and microbial behavior of composites with different filler types. Microhybrid, nanohybrid, nano-filled and nano-filled flowable composites were bio-aged with saliva biofilm for 30 days. Surface morphology, roughness, mechanical and aesthetic properties were determined. A 48 h saliva biofilm model was used to evaluate the microbial behavior of different composites in vitro. Biofilm metabolic activity, lactic acid production and live/dead bacterial staining were tested. Six volunteers were selected to wear intra-oral appliances with composite slabs for 24 h and biofilms were collected and analyzed using 16S rRNA sequencing to assess the biofilm formation over those materials in situ. Although there were increasing trends, surface roughness, water resorption and material solubility had no significant changes for all groups after bio-aging (p > 0.05). There were no significant changes in elastic modulus for all groups after aging (p > 0.05). However, a decrease in flexural strength in all groups was observed (p < 0.05), except for the nanoflow composite group (p > 0.05). The Vickers hardness remained stable in all groups after aging (p > 0.05), except for the nano-filled group (p < 0.05). The nanoflow composite showed distinct color changes compared to the micro-hybrid group after aging (p < 0.05). Biofilm metabolic activity and lactic acid production in vitro increased slightly after bio-aging in all groups, but with no statistical significance (p > 0.05). The Shannon index diversity of biofilms in situ decreased after aging (p < 0.05), while no significant difference was shown in species composition at the genus level in all groups (p > 0.05). Resin composites with different sized fillers displayed a relatively stable mechanical performance and uncompromised microbial behavior both in vitro and in situ after 30 days of bio-aging. Based on the results, composites with different filler types can be selected flexibly according to clinical needs. However, a longer time for bio-aging is still needed to confirm the mechanical properties and microbial behaviors of composites in the long run.

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“…After storage, the contrast ratio was higher than that of the polymerized composite and was similar to its value before polymerization. Initially, the effect of water in the resin composite may cause softening of the organic matrix by hygroscopic expansion and hydrolysis or hydration of siloxane bonds of the silane layer ( Krüger et al, 2018 , Manojlovic et al, 2016 , Panahandeh et al, 2017 , Wang et al, 2018 ). Thus, an analysis of the components released from the resin composites in water could help to understand the color changes observed.…”

Section: Discussionmentioning

confidence: 99%

Changes in color and contrast ratio of resin composites after curing and storage in water

Pedrosa

Nogueira

Baldo

et al. 2021

The Saudi Dental Journal

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Purpose To verify the color change and contrast ratio of resin composites after curing and after 30 days of storage in water. Methods Dentin A2 shades of different light-cured dental resin composites (Vittra APS, FGM, Brazil; Z350 XT, 3M ESPE, EUA; Tetric N-Ceram, Ivoclar Vivadent, Liechtenstein, and Charisma Diamond, Heraeus Kulzer, Germany) were tested. Ten rounded specimens (8 mm × 2 mm) were prepared for each material. Reflectance for all samples was obtained using a spectrophotometer (Minolta CM 3700d, Konica Minolta, Japan) before curing, immediately after curing, and after 30 days of storage in water. The color change (ΔE* lab ) and contrast ratio (CR) data were analyzed using a one-way analysis of variance with Tukey's and paired t-tests (α = 1%). Results For all materials tested, significant color changes were noticeable after curing and after 30 days in water (p < 0.01). Significant changes in the CR values before curing, after curing, and 30 days of storage in water were observed in the resin composites investigated (p < 0.01) except for Z350 (p > 0.01). Conclusion The CR values and color changes after curing and 30 days of storage in water varied depending on the material tested. This study corroborates the clinical practice of curing a small amount of unpolymerized resin composite on the tooth surface to select the desired shade before undertaking esthetic restorative procedures.

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Effect of water storage on flexural strength of silorane and methacrylate-based composite resins

Cited by 7 publications

References 22 publications

Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil

Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil

Effects of Bio-Aging on Mechanical Properties and Microbial Behavior of Different Resin Composites

Changes in color and contrast ratio of resin composites after curing and storage in water

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