Roughness and Microhardness of Composites after Different Bleaching Techniques. Issue 4 (October 2015)

• Record Type: Journal Article
• Authors: Leal, Andreia; Paula, Anabela; Ramalho, Amílcar; Esteves, Miguel; Ferreira, Manuel Marques; Carrilho, Eunice
• Is Part Of: Journal of applied biomaterials & functional materials. Volume 13:Issue 4(2015)
• Page Start: 381
• Page End: 388
• Publication Date: 2015-10
• Subjects: Microhardness -- Resin composite -- Roughness -- Tooth bleaching; Biomedical materials -- Periodicals; Bioengineering -- Periodicals; Biomechanics -- Periodicals; 610.28
• DOI: 10.5301/jabfm.5000239
• Languages: English
• ISSNs: 2280-8000

Abstract

Background: The aim of this study was to evaluate the roughness and microhardness of SonicFill™ (Kerr), and compare it with Filtek™ Supreme XTE (3M ESPE) after 2 bleaching regimens. Methods: Sixty cylindrical specimens (10 × 2 mm) of each of the 2 composites were prepared and divided into 6 groups (n = 20): groups 1, 2: no treatment; groups 3, 4: 10% carbamide peroxide (CP); and groups 5, 6: 35% hydrogen peroxide (HP) plus LED. After treatments, specimens were thermocycled (500 cycles, 5°C/55°C, dwell time 30 minutes). A mechanical roughness tester was employed to measure the surface roughness parameters and the Vickers test to measure microhardness. One-way ANOVA, Tukey and Bonferroni methods with a significance level of 5% were used for the statistical analysis. Results: For SonicFill™, there was no statistically significant difference in microhardness between the control group (no. 1) and the bleached groups (nos. 3, 5), but there was difference between CP and HP treatments; for Filtek™ Supreme XTE, there was no significant difference in microhardness among all groups. There was no significant difference in average roughness (Ra ) and the root mean square of the roughness (Rq ) among all groups. The mean roughness depth (Rz ) parameter showed no statistically significant differences among all groups for SonicFill™, but in Filtek™ Supreme XTE, there was a significant increase between control and bleaching treatments; roughness skewness (Rsk ) showed no statistically significant differences among all groups for SonicFill™ and Filtek™ Supreme XTE, except for nos. 2 and 4, where the Rsk increased with CP. Conclusions: The microhardness of Filtek™ Supreme XTE is less affected by bleaching than that of SonicFill™. Both bleaching treatments affect Rz in Filtek™ Supreme XTE in contrast to SonicFill™, but only the CP treatment affects the Rsk of Filtek™ Supreme XTE, with no significant effect of SonicFill™.