Effect of brushing and accelerated ageing on color stability and surface roughness of composites

Author(s)

Rego Roselino, Lourenco de Moraes ; Cruvinel, Diogo Rodrigues ; Chinelatti, Michelle Alexandra ; Panzeri Pires-de-Souza, Fernanda de Carvalho

• Document type: Journal article
• Source: Journal of Dentistry; v. 41, p. 8-pg., 2013-11-01.

Abstract

Objectives: The aim of this study was to evaluate the effect of brushing and artificial accelerated ageing (AAA) on color stability and surface roughness of aesthetic restorative materials. Methods: One hundred and twenty specimens (12 mm diameter x 2 mm thick), 40 of each material (n = 8) were obtained using nanosized composite Z350 (3M ESPE), nanohybrid composite Tetric N-Ceram (Ivoclar Vivadent) and ceramic IPS e.max Ceram (Ivoclar Vivadent), as control. Initial color (Spectrophotometer PCB 6807) and surface roughness (Surf-corder SE 1700) readouts were taken and the samples were separated into five groups (n = 8) and treated as follows: Group 1: mechanical brushing with dentifrice RDA* 68 (Colgate), Group 2: mechanical brushing with dentifrice RDA* 180 (Colgate Total Plus Whitening), Group 3: AAA, Group 4: AAA followed by mechanical brushing with dentifrice RDA* 68 and Group 5: AAA followed by mechanical brushing with dentifrice RDA* 180. Mechanical brushing was performed for 205 min and AAA for 480 h; new color and surface roughness readouts were taken. Data were statistically analyzed (two-way ANOVA repeated measures, Bonferroni test, p < 0.05). Results: Dentifrice abrasiveness was not significant for color change and surface roughness. When submitted to AAA+brushing, the color stability of Tetric was statistically significant (p < 0.05) with both dentifrices and with dentifrice RDA* 180 for Z350. The roughness was different (p < 0.05) for Z350 when brushed with RDA* 68 after AAA. Conclusions: Dentifrice abrasiveness did not interfere in the ability to remove stains and roughness from aged samples. However, staining is material-dependent. Clinical significance: The abrasiveness of dentifrice does not change the color and surface roughness of the composites and does not help to remove surface stains from the aged samples. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 10/04263-8 - Effect of simulated toothbrushing and artificial accelerated aging on surface degradation of esthetic restorative materials
• Grantee: Lourenço de Moraes Rego Roselino
• Support Opportunities: Scholarships in Brazil - Master