Microstructure and Mechanical Properties of Composite Resins Subjected to Accelerated Artificial Aging

Reis, Andréa Cândido dos; Castro, Denise Tornavoi de; Schiavon, Marco A.; Silva, Leandro Jardel da; Agnelli, José Augusto Marcondes

doi:10.1590/0103-6440201302263

Cited by 18 publications

(12 citation statements)

References 22 publications

(20 reference statements)

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“…That may be explained to some extent by the various methods, which differ in the duration for one cycle and the temperature or the storing medium. Some authors determined a slight decrease [26, 29] while others found a slight increase in strength [27–29]. …”

Section: Discussionmentioning

confidence: 99%

“…In various studies it has been demonstrated that hardness of composite filling materials is not affected by thermal cycling, while flexural strength decreases significantly under the same conditions [26–29]. In contrast to these findings Medeiros et al [24] report on a positive correlation between Vickers hardness and indirect tensile strength when investigating the aging of a composite resin restorative material, while Aguiar et al [25] observed the opposite.…”

Section: Introductionmentioning

confidence: 99%

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Assessing degradation of composite resin cements during artificial aging by Martens hardness

2017

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BackgroundAim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging.MethodsFour cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to allow complete polymerization (baseline). Subsequently the specimens were artificially aged by water storage at 37 °C or thermal cycling (n = 6). Hardness was measured at baseline as well as after 1, 4, 9 and 16 days of aging. Specimens for indirect tensile strength measurements were produced in a similar manner. Indirect tensile strength was measured at baseline and after 16 days of aging (n = 10). The results were statistically analyzed using one-way ANOVA (α = 0.05).ResultsAfter water storage for 16 days hardness was significantly reduced for VL2, RUN and DCM while hardness of PDC as well as indirect tensile strength of all cements were not significantly affected. Thermal cycling significantly reduced both, hardness and indirect tensile strength for all cements. No general correlation was found between Martens hardness and indirect tensile strength. However, when each material was analyzed separately, relative change of hardness and of indirect tensile strength revealed a strong linear correlation.ConclusionsMartens hardness is a sensible test method to assess aging of resin composite cements during thermal cycling that is easy to perform.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing degradation of composite resin cements during artificial aging by Martens hardness

2017

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“…The aging is dependent upon many factors and can promote alterations in the surface microstructure, the chemical composition of the matrix, and filler particles of composite resins (DOS REIS et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effects of artificial accelerated aging on the optical properties of resin composites

Dantas¹,

Mathias²,

Borges³

et al. 2018

Biosci. J.

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ABSTRACT:The aim of this study was to evaluate the effects of ultraviolet artificial aging on color, fluorescence, gloss, and translucency of different composite resins. Seventy-five cylindrical-shaped specimens (6 mm in diameter and 1 mm thick) of four different composites: Admira Fusion (VOCO), TPH3 (DENTSPLY), GrandioSO (VOCO) and Filtek™ Z350 XT (3M/ESPE), were built. Enamel samples obtained from bovine incisors were prepared with the same dimensions and used as a control group. Assessments of color, translucency, fluorescence, and gloss were performed at baseline and after artificial aging. Specimens were immersed in artificial saliva and submitted to artificial aging (UV light for 300h). Data were analyzed using one-way ANOVA and Tukey's post hoc test (α=0.05). After aging, all resin composites presented significant alterations, mainly Filtek™ Z350 XT. Fluorescence decreased in all resin composites and enamel. Gloss was reduced in all groups, too, with major rates for TPH3 and GrandioSO, which was similar to the enamel reduction. Translucency did not present a significant difference for the resin composites, although there was a reduction in the enamel. After artificial aging resin composites became darker, less fluorescent, less glossy, and with no alteration in translucency.

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“…These results corroborate with Catelan et al, 14 who analyzed the Vit-l-escence composite resin and observed a reduction in surface microhardness after AAA. However, in a study performed by Reis et al 15 demonstrated that AAA did not change the mechanical and physical properties, such as hardness, compressive strength, thermal behavior, and spectral profile, of Tetric N-Ceram. It is important highlighted that study used a 50 kgf load for 5 seconds, which was different from the study conducted by Catelan et al 14 and the present study which used equivalent parameters, 50 kgf load for 15 seconds and a 25 kgf load for 30 seconds, respectively.…”

Section: Discussionmentioning

confidence: 93%

“…It is important highlighted that study used a 50 kgf load for 5 seconds, which was different from the study conducted by Catelan et al 14 and the present study which used equivalent parameters, 50 kgf load for 15 seconds and a 25 kgf load for 30 seconds, respectively. 14,15 Various methods can be used to assess colors, such as the use of guide scales, image analysis, colorimeters, or spectrophotometers. Since the use of spectrophotometers allows for objective assessment and provides accurate quantitative data, it was the method utilized in this study.…”

Section: Discussionmentioning

confidence: 99%

Influence of Light-curing Units on Surface Microhardness and Color Change of Composite Resins after Challenge

Souza¹,

Briso²,

Oliveira-Reis³

et al. 2019

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to evaluate microhardness and color change (ΔE) of composite resins, light cured with different light emission diodes (LEDs) and submitted to artificial accelerated aging (AAA). Materials and methods:Two composite resins with lucirin-TPO photoinitiator were selected: Tetric N-Ceram (Ivoclar Vivadent, A1) and Vit-l-escence (Ultradent, WO).A resin with the only camphorquinone photoinitiator was chosen as a negative control: Filtek Z350XT (3M ESPE, WD). Disc-shaped specimens were prepared (5 mm diameter; 1.5 mm thick) and photopolymerized with an LED with one wavelength (Radii-Cal, SDI) or multiple wavelengths (Valo, Ultradent), for each composite resin (n = 10). Surface microhardness and color evaluations were performed immediately after specimen preparation and after AAA. Microhardness results were analyzed using Kruskal-Wallis and Mann-Whitney tests for multiple comparisons. To compare the evaluation of microhardness at different times, the Wilcoxon test was used. Mean values of ΔE, ΔL, Δa, and Δb were evaluated using two-way analysis of variance (ANOVA), and Tukey test for multiple comparisons (α = 0.05). Results:Regarding microhardness, a statistically significant difference between the two LEDs was observed for Vit-lescence after AAA. When comparing composite resins that were light-cured with the same device, FiltekZ350XT obtained the greatest microhardness. All groups presented a statistically significant decrease in microhardness from the initial time to the AAA. Regarding ΔE, no statistically significant difference between the two LEDs was observed. When comparing composite resins, FiltekZ350XT showed the highest ΔE values. Conclusion:In general, an LED with multiple wavelengths influenced the microhardness of only one resin containing lucirin-TPO after AAA. The ΔE was more influenced by the composite resin than the LED device. Clinical significance:The knowledge of composite resin with deficiencies in the polymerization mechanism could contribute to preventing restorations to become more susceptible to color change and reduction of the mechanical strength.

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Microstructure and Mechanical Properties of Composite Resins Subjected to Accelerated Artificial Aging

Cited by 18 publications

References 22 publications

Assessing degradation of composite resin cements during artificial aging by Martens hardness

Assessing degradation of composite resin cements during artificial aging by Martens hardness

Effects of artificial accelerated aging on the optical properties of resin composites

Influence of Light-curing Units on Surface Microhardness and Color Change of Composite Resins after Challenge

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