Carbamide peroxide bleaching agents: effects on surface roughness of enamel, composite and porcelain

This study examined the effect of 10 and 35% carbamide peroxide bleaching agents on the surface roughness of enamel, feldspathic porcelain, and microfilled and microhybrid composite resins. Standardized cylindrical specimens were prepared for restorative materials. Enamel samples were obtained from...

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Bibliographic Details
Published in:Clinical oral investigations 2006-03, Vol.10 (1), p.23-28
Main Authors: Moraes, R R, Marimon, J L M, Schneider, L F J, Correr Sobrinho, L, Camacho, G B, Bueno, M
Format: Article
Language:English
Subjects:
Aluminum Silicates - chemistry
Composite Resins - chemistry
Dental Enamel - drug effects
Dental Enamel - ultrastructure
Dental Materials - chemistry
Dental Porcelain - chemistry
Drug Combinations
Humans
Materials Testing
Oxidants - administration & dosage
Oxidants - chemistry
Oxidants - pharmacology
Peroxides - administration & dosage
Peroxides - chemistry
Peroxides - pharmacology
Potassium Compounds - chemistry
Surface Properties
Temperature
Time Factors
Tooth Bleaching
Urea - administration & dosage
Urea - analogs & derivatives
Urea - chemistry
Urea - pharmacology
Water - chemistry
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Summary:This study examined the effect of 10 and 35% carbamide peroxide bleaching agents on the surface roughness of enamel, feldspathic porcelain, and microfilled and microhybrid composite resins. Standardized cylindrical specimens were prepared for restorative materials. Enamel samples were obtained from buccal and lingual surfaces of human molars. Samples from each substrate were divided in three subgroups (n=10), according to surface treatment: distilled water (control), and 10 and 35% carbamide peroxide. The 10% agent was applied 3 h daily and the 35% agent was applied for 30 min/week, at 37 degrees C, during 21 days. Control samples remained stored in distilled water, at 37 degrees C. Roughness measurements (Ra, microm) were made at 24 h and repeated after 7, 14 and 21 days of exposure. Data were analyzed using ANOVA (split-plot design) and Tukey's test (5% significance level). Samples from control groups showed no significant alteration during all test periods, while for exposure to 10% agent, only the porcelain presented a rougher surface after 21 days (p
ISSN:1432-6981
1436-3771
DOI:10.1007/s00784-005-0016-1