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Treatment of composite surfaces for indirect bonding
Summary
For indirect composite restorations, air abrasion followed by silanation significantly improves bonding to enamel. Other surface treatments like hydrofluoric acid etching were less effective, yielding weaker bonds.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Indirect restorations utilize composite materials cured extraorally.
- Dual-cure resin cements are standard for bonding these restorations.
- Optimizing the bond between indirect composites and tooth structure is crucial for restoration longevity.
Purpose of the Study:
- To evaluate surface treatment methods for glass-filled composite to enhance enamel bonding.
- To compare the effectiveness of air abrasion, hydrofluoric acid etching, and silanation.
Main Methods:
- Testing various surface treatments: air abrasion, 9.6% hydrofluoric (HF) acid etching, silanation, and combinations.
- Measuring shear bond strength of treated composite specimens.
- Assessing bond strength after thermocycling to simulate intraoral conditions.
Main Results:
- Air abrasion followed by silanation yielded the highest and most consistent shear bond strengths.
- Hydrofluoric acid etching, alone or combined with air abrasion, reduced bond strength.
- Weakest bonds and adhesive failures were observed with HF acid etching alone.
Conclusions:
- Air abrasion combined with silanation is the most effective surface treatment for improving indirect composite to enamel bonds.
- Hydrofluoric acid etching is not recommended for treating indirect composite surfaces for bonding.
- Proper surface preparation is critical for durable indirect composite restorations.