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The effect of bleaching agent on composite/enamel bonding
P J van der Vyver1, S B Lewis, J T Marais
1Division of Dental Materials, Faculty of Dentistry, University of Pretoria.
The Journal of the Dental Association of South Africa = Die Tydskrif Van Die Tandheelkundige Vereniging Van Suid-Afrika
|February 14, 1998
Summary
Dental bonding strength is reduced after in-office hydrogen peroxide bleaching. Waiting two weeks post-bleaching significantly improves composite resin bond strength to etched enamel.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Biomaterials
Background:
- In-office bleaching using light-activated hydrogen peroxide is a common cosmetic dental procedure.
- The potential impact of bleaching agents on the immediate and short-term bond strength of restorative materials to tooth structure remains a clinical concern.
Purpose of the Study:
- To evaluate the effect of an in-office light-activated hydrogen peroxide bleaching agent on the shear bond strength of composite resin to etched enamel.
- To determine the optimal waiting period between bleaching and bonding procedures.
Main Methods:
- An in vitro study design was employed.
- Specimens were divided into four groups: control (no bleaching), bonded immediately after bleaching, bonded one week after bleaching, and bonded two weeks after bleaching.
- Shear bond strength testing was performed on composite resin bonded to etched enamel for all groups.
Main Results:
- Mean shear bond strengths were lower in all bleached and immediately bonded groups compared to the unbleached control group.
- Bonding immediately after bleaching (14.2 +/- 4.9 MPa) and one week after bleaching (19.2 +/- 3.2 MPa) resulted in significantly lower shear bond strengths than the control (25.1 +/- 3.7 MPa).
- Bonding two weeks after bleaching (23.1 +/- 3.7 MPa) showed improved, though still slightly reduced, bond strength compared to immediate and one-week intervals.
Conclusions:
- Light-activated hydrogen peroxide bleaching agents negatively affect the shear bond strength of composite resin to etched enamel.
- It is recommended to postpone dental bonding procedures for at least two weeks following in-office bleaching to ensure optimal bond strength.