Efeito do envelhecimento em ácido cítrico na microdureza e resistência à flexão de resinas compostas

Silva, Patrícia Ferreira da; Barragán, Gonçalo; Chasqueira, Filipa; Oliveira, Sofia A.; Portugal, Jaime

doi:10.1016/j.rpemd.2012.07.001

Cited by 2 publications

(3 citation statements)

References 31 publications

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“…31,33 In order to simulate oral conditions, all specimens were aged immersed in artificial saliva in interchanging cycles of 6 hours at pH=3 and 18 hours at pH=7. 39,[43][44][45] Since the reline acrylic resin may be considered a provisional material, and considering the time during which CHX release levels remain constant for an effective treatment of denture stomatitis, a 28-day aging period was selected to allow comparison with previous research studies. 14,17,26,[28][29][30]46 Given that Probase Cold presented higher microhardness and flexural strength than the other reline acrylic resins studied, the first and second null hypotheses are rejected.…”

Section: Discussionmentioning

confidence: 99%

“…Food and drinks can affect dental materials and intraoral pH values. [38][39] The objective of this study was to evaluate the effect of loading three reline acrylic resins with CHX on their microhardness and flexural strength, after a 28-day chemical aging process. The following hypotheses were studied: 1) there are no differences in microhardness between reline acrylic resins; 2) the reline acrylic resin does not influence flexural strength; 3) the incorporation of CHX does not influence the reline acrylic resin microhardness; and 4) the incorporation of CHX does not affect the flexural strength of the reline acrylic resin.…”

Section: Introductionmentioning

confidence: 99%

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Microhardness and flexural strength after chemical aging of chlorhexidine delivery systems based on acrylic resin

Neves¹,

Costa²,

Nepomuceno³

et al. 2019

j.rpemd

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To evaluate the effect of chlorhexidine incorporation on the microhardness and flexural strength of three reline acrylic resins, after a 28-day chemical aging process. Methods: Forty-eight specimens were fabricated according to the several possible combinations of acrylic reline resin and concentrations of incorporated chlorhexidine (Kooliner-0% vs. 2.5%; Ufi Gel Hard-0% vs. 5%; and Probase Cold-0% vs. 5%), to set 6 experimental groups (n=8). After a 4-week chemical aging process (pH fluctuation in artificial saliva, with cycles of 6 hours at pH=3 and 18 hours at pH=7), the Knoop microhardness (98.12 mN, 30 seconds) and flexural strength (1 kN, 5 mm/min) of all specimens were evaluated. Data were submitted to non-parametric statistical tests, according to Kruskal-Wallis and Mann-Whitney (α=0.05). Results: Chlorhexidine incorporation did not significantly affect the microhardness of the three tested resins (Kooliner-p=0.798; Ufi Gel Hard-p=0.798; and Probase Cold-p=0.195). Although chlorhexidine incorporation did not influence the flexural strength of Kooliner (p=0.959) and Ufi Gel Hard (p=0.645), the incorporation of 5% chlorhexidine in Probase Cold led to a statistically lower flexural strength than that obtained without incorporation (p=0.021). Conclusion: After chemical aging, the microhardness of chlorhexidine-incorporated acrylic resins is not affected. However, the incorporation of 5% chlorhexidine into Probase Cold negative

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microhardness and flexural strength after chemical aging of chlorhexidine delivery systems based on acrylic resin

Neves¹,

Costa²,

Nepomuceno³

et al. 2019

j.rpemd

Self Cite

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“…One of the purposes of this study was to analyze the effect of mouthwashes on the microhardness of composite resins, not only because they are widely used by population, but also because several studies indicate that the properties of these materials are significantly affected by immersion in acidic and alcoholic solutions. 18,[26][27][28][29][30] Therefore, artificial aging of the specimens was performed with immersion cycles in mouthwashes in order to simulate 1 year of daily mouthwash. To minimize the oxygen inhibition layer, which may influence the results, the composites were cured against an acetate strip.…”

Section: Discussionmentioning

confidence: 99%

Effect of surface treatment and the use of mouthwashes on repaired composite bond strength

Pinheiro¹,

Barragán²,

Chasqueira³

et al. 2019

j.rpemd

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The purpose of this study was to evaluate the effect of mouthwashes on composite Knoop microhardness, and to assess the influence of the contact with mouthwashes and mechanical surface treatment on the shear bond strength of repaired composite resins. Methods: One hundred twenty composite resin (GrandioSO) specimens were prepared and randomly divided into four experimental groups, according to the used mouthwash (distilled water; Listerine Teeth & Gum; Eludril Perio; Lacer Oros). After a period of 5 days in water (37ºC), during which the specimens were submitted to twelve cycles of 2 hours of immersion in the respective mouthwash, the Knoop microhardness was determined. Then, each group was divided into three subgroups based on the mechanical surface treatment performed (no treatment; 50-µm Al2O3 sandblasting; abrasion with diamond bur), the repair protocol was performed (Solobond M and GansdioSO) and specimens were submitted to shear bond strength tests until failure. Data were analyzed using ANOVA followed by Student-Newman-Keuls post-hoc tests (α=0.05). Results: The group of specimens aged in distilled water presented a significantly harder surface than the other experimental groups (p<0.05). No statistically significant differences were found (p>0.05) between other groups. Neither the immersion media (p=0.214) nor the mechanical surface treatments (p=0.165) had a significant effect on the bond strength. Conclusions: Although the hardness of the composite was negatively affected by contact with the mouthwashes used in this study, the bond strength of composite repair was not affected.

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Efeito do envelhecimento em ácido cítrico na microdureza e resistência à flexão de resinas compostas

Cited by 2 publications

References 31 publications

Microhardness and flexural strength after chemical aging of chlorhexidine delivery systems based on acrylic resin

Microhardness and flexural strength after chemical aging of chlorhexidine delivery systems based on acrylic resin

Effect of surface treatment and the use of mouthwashes on repaired composite bond strength

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