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ORIGINAL RESEARCH Table of Contents   
Year : 2016  |  Volume : 27  |  Issue : 5  |  Page : 488-491
Effect of nightguard vital bleaching gel on the color stability of provisional restorative materials


Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia

Correspondence Address:
Salwa Omar Bajunaid
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh
Saudi Arabia
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.195625

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Purpose: To assess the hypothesis that there was no difference in effect of 10% and 15% tooth bleaching agents on color stability of materials used for provisional fixed dental prosthesis. Methodology: Fifteen samples from two materials used for provisional fixed dental prosthesis: methacrylate-based and composite-based materials and 15 preformed polycarbonate crowns soaked in bleaching gel or distilled water. Spectrophotometer recorded color of specimens at baseline, after 3, 7, and 14 days. Data were statistically analyzed using two-factor ANOVA test to compare the color stability of tested materials. Results: Methyl-based provisional material exhibited statistically higher color change when exposed to 10% and 15% bleaching gel (delta E*: 9.0 and 11.1, respectively) as compared to distilled water (delta E*: 2.9). Delta E* of composite-based material specimens exposed to distilled water was statistically higher (6.3) than specimens exposed to 10% and 15% bleaching gel (1.5 and 1.1, respectively). Polycarbonate crowns showed a statistically lower color change when exposed to 15% (0.9) than to 10% bleaching gel (5.1) or distilled water (5.5). Conclusions: Composite-based provisional material showed highest color stability when exposed to vital tooth bleaching gel, whereas methacrylate-based material was the least color stable. Polycarbonate crowns were more color stable when exposed to 15% bleaching gel as opposed to 10% bleaching gel.


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