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Effect of Office Bleaching on Enamel Bonding Performance
The Journal of Adhesive Dentistry
|April 6, 2019
Summary
In-office bleaching significantly reduces enamel bond strength for self-etch adhesives (SEA), even with phosphoric acid (PA) pre-treatment. Thick acid-base resistant zones (ABRZ) formed, impacting bond durability.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Research
Background:
- In-office bleaching is common but can affect dental restorations.
- Understanding its impact on enamel bond strength is crucial for clinical success.
Purpose of the Study:
- To evaluate how in-office bleaching affects the enamel microshear bond strength (µSBS) of two self-etch adhesives (SEA).
Main Methods:
- Bovine enamel was bleached, and adhesives (two-step SE2, one-step GP) were applied immediately or after one week, with/without phosphoric acid (PA) etching.
- Microshear bond strength (µSBS) was measured at 24 hours and 1 week.
- Acid-base resistant zones (ABRZ) were analyzed via SEM.
Main Results:
- In-office bleaching significantly reduced µSBS for both SE2 and GP, irrespective of PA etching.
- No significant µSBS difference was found between groups with/without PA etching, except for SE2 without bleaching.
- Thick, wave-like ABRZs were observed after bleaching and PA treatment.
Conclusions:
- In-office bleaching adversely affects enamel µSBS.
- Bleaching and PA treatment create thick ABRZs, potentially influencing bond integrity.
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