Surface roughness of a resin composite

Abstract

ObjectiveThe aim of the present study was to evaluate the surface roughness (Ra) of the Z-350 resin composite following immersion in different media (distilled water, coca-cola, coffee, black tea and red wine). Methods Fifty Results A significant increase in Ra was found in the specimens submitted to coffee, coca-cola ® and black tea between baseline and the three-month evaluation. Variance was also found among the remaining evaluation times (3 months to 12 months), but the differences did not achieve statistical significance. No statistically significant differences in Ra were found among evaluation times in the specimens submitted to red wine or distilled water. ConclusionBased on the present findings, coca-cola, coffee and black tea exert an influence on the surface roughness of resin composites. RESUMO ObjetivoAvaliar a rugosidade da superfície (Ra) do Z-350 resina composta após imersão em diferentes meios (água destilada, coca-cola, café, chá preto e vinho tinto). MétodosForam preparados cinquenta espécimes de resina composta medindo 10 mm x 2 mm. A polimerização foi realizada através do método convencional (40 s). Cada espécime foi imerso durante uma hora por dia. As avaliações foram realizadas na linha de base, bem como após três, seis, nove e 12 meses. Três leituras Ra foram levados em direções opostas em cada avaliação, utilizando um medidor de rugosidade. Os valores médios de Ra foram submetidos a análise de variância (ANOVA) seguido pelo teste de Tukey (p <0,05). ResultadosUm aumento significativo na Ra foi encontrada nas amostras submetidas ao café, coca-Cola ® e chá preto entre o início e a avaliação de três meses. Variância também foi encontrado entre as épocas de avaliação restantes (3 meses a 12 meses), mas as diferenças não atingiram significância estatística. Não houve diferenças estatisticamente significativas na Ra encontrados entre os momentos de avaliação nos casos submetidos ao vinho tinto ou água destilada. ConclusãoCom base nos achados, coca-cola, café e chá preto exercem uma influência sobre a rugosidade superficial de resinas compostas.Termos de indexação: Bebidas. Imersão. Resinas compostas. Erosão dentária.

Effect of air-polishing on properties of nanocomposite submitted to coffee, red wine and cigarette smoke

“…The exposure to coffee increased the resin surface roughness and stain- ing if compared to control group, independently of the association to SBAP. This fact can be due to coffee's acid pH, around 5.0, as well as the presence of long-chain organic acids, that they can promote dissolution and corrosion on restorative materials 6 .It is reported that the coffee also has high temperature, as used in this experiment, that it can promote degradation of the resin matrix, since areas of material exposed to high temperatures exhibited considerable increased of roughness and superficial staining 27 .…”

“…Overall, the surface quality of the restorative material influences the clinical performance and durability of restorations 5 , since the maintenance of flat surface decreases early alterations of color and shine, besides of reducing the biofilm growth on surface restoration, which decreases risk of secondary caries lesions and periodontal inflammation [4][5][6][7][8][9] . The roughness present on resin surface can be detected by the tip of the patient's tongue since 0.3µm 10 .…”

“…Besides, resin composite is a restorative material mightily influenced by oral environment conditions, as moisture, the contact with low pH substances, contact with alcohol or other solvents and even changes of temperature 17,18 .These factors can be more harmful to the resin composite structure because it shows a more degraded or porous surface 6 .…”

Novel antibacterial calcium phosphate nanocomposite with long-term ion recharge and re-release to inhibit caries

“…Composite bars with approximately 2×2×12 mm dimensions were used for surface roughness assessments before starting the ion release and recharge. The average surface roughness (R a, μm) was measured with a Mitutoyo (SJ-310 SURFTEST, Kanagawa, Japan) surface roughness tester following a previous study (n=6) 37) . In a previous study, composite surfaces produced using Mylar strips showed surface roughness values that were not significantly different from the Enhance/BisCover finishing protocol 38) .…”