WHITENING TOOTHPASTE EFFECT ON GLOSS, SURFACE ROUGHNESS AND COLOUR STABILITY OF PROVISIONAL RESTORATIVE MATERIALS

Abstract

Purpose: This study was to evaluate the effect of whitening toothpaste on gloss, surface roughness, and colour stability of provisional restorative materials. Material and Methods: Three provisional restorative materials were evaluated; Unifast Trad (UT), Protemp4 (PT) and TelioC&B (TC). One direct composite resin, Filtek Z250XT (FT), was chosen as control. Two toothpastes, Colgate Optic Whitening® (CO), and Colgate Proven Cavity Protection® (CP), and deionized water (DI) without toothpaste were selected as the brushing media in this study. Gloss, surface roughness, and colour were measured before and after 10,000 (10k) brushing cycles with each brushing media. One-way ANOVA was used to analyze the gloss change (∆G), surface roughness change (∆Ra), and colour change (∆E) of each material with all brushing media. Results: FT, TC and UT showed significant decrease in gloss after brushing with CO. Only PT did not show significant difference in gloss after brushing with all media. All materials showed significant increase in Ra after brushing with CO. No significant difference in ∆E were observed in all materials except TC which showed significant change in ∆E after brushing with CO compared to DI. Conclusion: Brushing with whitening toothpaste (CO) caused significant reduction in gloss of all materials except bis-acryl composite resin (PT) and significant increase in surface roughness of all materials when compared to DI. ∆E of all materials, after brushing with all media, were within 50/50% acceptability threshold (∆E <2.7).