Affiliations: [a] Materials Science and Engineering Department, Kroto Research Institute, University of Sheffield, Sheffield, UK | [b] Dental Health Department, College of Applied Medical Science, King Saud University, Riyadh, Saudi Arabia | [c] Department of Restorative Dentistry, College of Dentistry, Taibah University, Madinah Al Munawwarah, Kingdom of Saudi Arabia
Correspondence:
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Corresponding author: Muhammad Sohail Zafar, Department of Restorative Dentistry, College of Dentistry, Taibah University P.O Box 2898, Madinah Al Munawwarah 41311, Kingdom of Saudi Arabia. Tel.: +966 507544691; E-mail:drsohail_78@hotmail.com
Abstract: 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.
Keywords: Bleaching system, composite, dental porcelain, surface properties, SEM
