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Carbamide peroxide bleaching: effects on enamel surface hardness and bonding
D F Murchison1, D G Charlton, B K Moore
1USAF Medical Center, Keesler AFB, MS 39534.
Operative Dentistry
|September 1, 1992
Summary
Short-term use of 10% carbamide peroxide home bleaching agents did not significantly impact resin-enamel bond strength or enamel surface hardness. This finding suggests dental bleaching agents are safe for enamel bonding and surface integrity in the short term.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Conservative Dentistry
Background:
- Home bleaching with carbamide peroxide is a popular cosmetic dental procedure.
- Concerns exist regarding potential adverse effects of bleaching agents on dental hard tissues.
- Enamel bond strength and surface hardness are critical factors for restorative and orthodontic procedures.
Purpose of the Study:
- To evaluate the effect of 10% carbamide peroxide home bleaching agents on resin-enamel bond strength.
- To assess the impact of these bleaching agents on enamel surface hardness.
- To determine the short-term safety of common home bleaching agents on key dental parameters.
Main Methods:
- Eighty extracted bicuspid teeth were divided into three experimental groups (10% carbamide peroxide) and one control group.
- Teeth were treated with bleaching agents for five consecutive days.
- Tensile bond strength was measured using an Instron Universal Testing Machine after bracket bonding and thermocycling. Enamel Knoop hardness was measured pre- and post-bleaching.
Main Results:
- One-way ANOVA revealed no statistically significant differences in tensile bond strength among the four groups (P > 0.05).
- No significant differences were observed in pre- or post-bleaching Knoop hardness values across the groups (P > 0.05).
- Short-term exposure to 10% carbamide peroxide did not alter enamel surface hardness or bonding ability.
Conclusions:
- 10% carbamide peroxide home bleaching agents do not adversely affect enamel surface hardness in the short term.
- These bleaching agents do not significantly compromise the tensile bond strength of resin to enamel.
- The findings support the safe use of 10% carbamide peroxide for short-term home bleaching regimens without compromising enamel integrity or bonding capacity.