Influence of various bleaching regimes on surface roughness of resin composite and ceramic dental biomaterials.
BACKGROUND
Bleaching agents are commonly used in dentistry for treating the discolored teeth. A number of biomaterials and methods are in clinical applications.


OBJECTIVE
The major aim of this study was to evaluate the effects of two different bleaching agents on the surface roughness properties of dental resin nanocomposites and dental porcelains using various regimes.


METHODS
This study was conducted using direct restorative hybrid and nanocomposite materials and dental porcelains. The specimens were treated using the bleaching gels [(Opalescence Boost 40% OP) and (Whiteness HP 35% WHP)] for 30, 45, 60 and 120 minutes respectively. Treated samples were analyzed for surface roughness properties using contact mode surface profilometry and surface topography using scanning electron microscopy (SEM). Data was analyzed statistically using analysis of variance (ANOVA).


RESULTS
There were no significant changes observed in the roughness of nanofill, nanohybrid composites and ceramic materials compared to microhybrid resin composites (p> 0.05). The SEM photomicrographs confirmed the results of the profilometer showing slight changes in the microhybrid resin composite.


CONCLUSIONS
No remarkable difference was observed between the bleaching agents (Opalescence Boost and Whiteness HP Blue) for the surface roughness of tested dental materials. The bleaching agents can be used without harming the ceramic, nanofilled or nanohybrid resin restorations. However, if microhybrid or microfilled composite restorations are present in the oral cavity, bleaching may damage the surface finish and requiring replacement of restorations.
Materials Science and Engineering Department, Kroto Research Institute, University of Sheffield, Sheffield, UK.|Dental Health Department, College of Applied Medical Science, King Saud University, Riyadh, Saudi Arabia.
Saad
S
Qasim
Dental Health Department, College of Applied Medical Science, King Saud University, Riyadh, Saudi Arabia.
Ravikumar
R
Ramakrishnaiah
Dental Health Department, College of Applied Medical Science, King Saud University, Riyadh, Saudi Arabia.
Abdulaziz Abdullah
AA
Alkheriaf
Department of Restorative Dentistry, College of Dentistry, Taibah University, Madinah Al Munawwarah, Kingdom of Saudi Arabia.
Muhammad S
MS
Zafar
D001672:Biocompatible Materials; D003188:Composite Resins / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D053761:Nanocomposites; D013499:Surface Properties / Q000187:drug effects*; D058205:Tooth Bleaching Agents / Q000494:pharmacology*
D001672:Biocompatible Materials; D003188:Composite Resins; D058205:Tooth Bleaching Agents; D003776:Dental Porcelain
Bleaching system; SEM; composite; dental porcelain; surface properties