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Integrating oxalate desensitizers with total-etch two-step adhesive
F R Tay1, D H Pashley, Y F Mak
1Conservative Dentistry, University of Hong Kong, Hong Kong SAR, China.
Journal of Dental Research
|August 27, 2003
Summary
Applying oxalate desensitizers after acid-etching improves dentin bonding. This method prevents crystal interference, enhancing resin bonding strength for dental applications.
Area of Science:
- Dental materials science
- Biomaterials engineering
- Adhesive dentistry
Background:
- Total-etch adhesives can exhibit compromised bonding to dentin treated with oxalate desensitizers.
- This interference is due to a surface layer of acid-resistant calcium oxalate crystals.
Purpose of the Study:
- To investigate if depleting dentin of calcium with acids before desensitizer application can achieve effective tubular occlusion and dentin bonding.
- To evaluate the impact of the timing of oxalate desensitizer application relative to acid-etching on dentin bond strength.
Main Methods:
- Dentin specimens were treated with four oxalate desensitizers either before or after acid-etching.
- Specimens were subsequently bonded using a two-step adhesive.
- Microtensile bond strengths (μTBS) were measured and compared to controls.
Main Results:
- μTBS were significantly lower when oxalates were applied before acid-etching compared to controls.
- μTBS were similar to controls when oxalates were applied after acid-etching.
- Crystal formation was observed on dentin surfaces and tubular orifices when desensitizers were applied before acid-etching.
Conclusions:
- Acid-etching prior to oxalate desensitizer application prevents surface crystal interference.
- This sequence allows crystals to form within dentinal tubules, not interfering with resin bonding.
- Optimizing the timing of desensitizer application is crucial for successful dentin bonding with oxalate-based agents.