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Bleaching effect on bonding performance of composite to enamel
Milan Miljkovic1, Stefan Dacic2, Vladimir Mitic3
1Research Centre for Biomedicine, Faculty of Medicine, University of Nis, Nis, Serbia.
Microscopy Research and Technique
|June 5, 2024
Summary
Dental bleaching significantly reduces composite-to-enamel bond strength, especially immediately after the procedure. Waiting at least three days before restoration allows bond strength to recover, mitigating adverse effects.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials
Background:
- Dental bleaching is a common cosmetic procedure.
- Bleaching agents may affect the mechanical properties of tooth structure.
- The impact of bleaching on the bond strength of dental composites to enamel requires further investigation.
Purpose of the Study:
- To evaluate the immediate shear bond strength (SBS) of composite resin to enamel after different dental bleaching protocols.
- To determine the influence of time intervals between bleaching and composite restoration on bond strength.
- To assess the effect of bleaching on enamel surface and adhesive interface integrity.
Main Methods:
- Forty-five enamel specimens were divided into in-office bleaching, at-home bleaching, and unbleached control groups.
- Subgroups were established based on bonding intervals of 1, 3, and 7 days post-bleaching.
- Shear bond strength (SBS) testing was performed, and enamel surfaces were analyzed using scanning electron microscopy (SEM).
Main Results:
- Unbleached control group exhibited the highest average SBS.
- Both in-office and at-home bleaching significantly reduced SBS compared to the control.
- SBS was significantly reduced at 1 day post-bleaching, with weakest marginal sealing observed.
- A 3-day waiting period appeared sufficient to reverse the adverse effects of bleaching on SBS.
Conclusions:
- Dental bleaching procedures, particularly in-office and at-home methods, significantly decrease the shear bond strength of composite restorations to enamel.
- Immediate restoration after bleaching compromises bond strength and marginal integrity.
- A minimum waiting period of 3 days between bleaching and composite restoration is recommended to ensure adequate bond strength and clinical success.
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