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Roughness and microhardness of composites after different bleaching techniques.

Andreia Leal1, Anabela Paula1, Amílcar Ramalho2

  • 1Faculty of Medicine, University of Coimbra, Coimbra - Portugal.

Journal of Applied Biomaterials & Functional Materials
|December 1, 2015
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Summary

Dental composite microhardness and roughness were evaluated after bleaching. Filtek™ Supreme XTE showed less microhardness change than SonicFill™ following bleaching treatments.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Dental composites are widely used in restorative dentistry.
  • Bleaching agents can potentially alter the surface properties of dental restorations.
  • Evaluating the impact of bleaching on composite properties is crucial for clinical longevity.

Purpose of the Study:

  • To compare the surface roughness and microhardness of SonicFill™ and Filtek™ Supreme XTE after two bleaching regimens.
  • To assess the effects of carbamide peroxide and hydrogen peroxide plus LED bleaching on these composite materials.

Main Methods:

  • Two composite materials, SonicFill™ and Filtek™ Supreme XTE, were tested.
  • Specimens were subjected to 10% carbamide peroxide or 35% hydrogen peroxide plus LED bleaching.
  • Surface roughness and Vickers microhardness were measured after thermocycling.

Main Results:

  • Filtek™ Supreme XTE showed no significant microhardness changes after bleaching, unlike SonicFill™.
  • Both bleaching agents increased the mean roughness depth (Rz) in Filtek™ Supreme XTE but not in SonicFill™.
  • Roughness skewness (Rsk) was affected by carbamide peroxide in Filtek™ Supreme XTE but not in SonicFill™.

Conclusions:

  • Filtek™ Supreme XTE's microhardness is less susceptible to bleaching effects compared to SonicFill™.
  • Bleaching significantly impacts specific roughness parameters (Rz, Rsk) of Filtek™ Supreme XTE, with varying effects on SonicFill™.
  • Clinical implications suggest differences in the durability of these composites under bleaching conditions.