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

Translated title of the contribution: Effect of citric acid ageing on composite resin microhardness and flexural strength

Patrícia Ferreira da Silva, Gonçalo Barragán, Filipa Chasqueira, Sofia Arantes e Oliveira, Jaime Portugal

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Objectives: To evaluate the influence of citric acid aging on the microhardness and flexural strength of three composites resins. Materials and methods: 15 specimens of each microhybrid composite resin (1- Suprafil-R&S, 2- Proclinic-PM, 3- Tetric-EvoCeram) were prepared. After light curing specimens were randomly assigned to 3 protocols of aging (A- bi-distilled H2O pH = 6.6, immersion for 10 days; B- immersion for the first 24h in bi-distilled H2O pH = 6.6, followed by 9 cycles of 6h in citric acid pH = 2.5 interchanging with 18h of bi-distilled H2O pH = 6.6; C- immersion for 6h in citric acid pH = 2.5 interchanging with 18h of bi-distilled H2O pH = 6.6, followed by 24h immersion in bi-distilled H2O pH = 6.6). Therefore all the 9 experimental groups (n=5) were submitted to an ageing period of 10 days. The specimens were then submitted to Vickers microhardness test and flexural test. Data were analysed with ANOVA and Student-Newman-Keuls post-hoc test. Results: The scheme of aging C and the Proclinic-PM composite recorded statistically lower microhardness values (p<0,05) than the other. Flexural strength values were not influenced (p=0,42) by the scheme of aging, however Suprafil-R&S composite yielded statistically higher flexural strength values than the other composites (p<0,05). Conclusions: Exposure to citric acid immediately after light curing negatively influences the composite microhardness, but did not affect the flexural strength.

Translated title of the contributionEffect of citric acid ageing on composite resin microhardness and flexural strength
Original languagePortuguese (Brazil)
Pages (from-to)227-232
Number of pages6
JournalRevista Portuguesa de Estomatologia, Medicina Dentaria e Cirurgia Maxilofacial
Volume53
Issue number4
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

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