Colour-stability and gloss-retention of silorane and dimethacrylate composites with accelerated aging

Autor(es)

Furuse, Adilson Y. ^{[1, 2]} ; Gordon, Kathryn ^[2] ; Rodrigues, Flavia P. ^{[3, 2]} ; Silikas, Nick ^[2] ; Watts, David C. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, BR-17012901 Bauru - Brazil

^[2] Univ Manchester, Sch Dent, Biomat Sci Res Grp, Manchester, Lancs - England

^[3] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biochem, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Dentistry; v. 36, n. 11, p. 945-952, NOV 2008.
• Citações Web of Science: 43

Resumo

Objectives: To evaluate the colour-stability and gloss-retention of silorane versus dimethacrylate composites exposed to accelerated aging from daylight radiation. Methods: Five disc-shaped specimens of photo-cured resin-composites were prepared and manually polished for each material (Filtek Silorane, Herculite XRV, Tetric Evoceram and QuiXfil). Colour and gloss were evaluated before and after periods (baseline, 24, 72, 120 and 192 h) of accelerated photo-aging in xenon light following ISO 7491:2000. Colour measurements were performed with a colourimeter according to the CIE-Lab colour-space. The colour change (Delta E) for each time was calculated. The surface gloss was measured using a glossmeter. Results were evaluated using one-way ANOVA and Tukey tests (alpha = 0.05). Correlations between log time, Delta E and gloss were evaluated using Pearson's correlation (alpha = 0.05). Results: Materials generally decreased in L{*} and a{*} and increased in b{*}. The strong exception was Filtek Silorane which maintained a{*} and b{*}. Delta E was found to be a positive linear function of log time for all materials. Materials varied in the magnitude and rate of increase of Delta E with log time: QuiXfil > Tetric EvoCeram > (Filtek Silorane >= Herculite XRV). Delta E remained < 3.3 for Filtek Silorane and Herculite XRV. Gloss was found to be a negative linear function of log time. Gloss was maximal in the sequence: Filtek Silorane approximate to Tetric EvoCeram > Herculite XRV > QuiXfil. Conclusions: Silorane gave the best overall performance in stability over time, compared to a set of representative dimethacrylate composites. (C) 2008 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 06/00186-3 - Fatores que interferem na solicitação mecânica de interfaces de restaurações adesivas e soluções para sua minimização
• Beneficiário: Flávia Pires Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Doutorado