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Nd:YAG laser influence on sound dentin bond strength
A B Matos1, D C Oliveira, M Kuramoto
1University of São Paulo, School of Dentistry, Operative Dentistry Department, São Paulo, Brazil. p-bona@siso.fo.usp.br
Journal of Clinical Laser Medicine & Surgery
|February 24, 2001
Summary
Nd:YAG laser treatment before bonding significantly reduced composite resin bond strength to dentin. Applying the laser after bonding yielded results comparable to conventional methods, suggesting careful consideration of laser application timing in dental procedures.
Area of Science:
- Dental materials science
- Biomaterials engineering
- Laser-tissue interactions
Background:
- Lasers are integral to modern dentistry, enabling novel treatment modalities.
- Adhesive systems are crucial for numerous dental procedures, demonstrating high efficacy.
- This study investigates the synergistic effects of lasers and adhesive systems in restorative dentistry.
Purpose of the Study:
- To evaluate the tensile bond strength of composite resin to dentin.
- To compare the effects of Nd:YAG laser application before and after bonding procedures on bond strength.
Main Methods:
- Thirty human anterior teeth were used, with dentin surfaces prepared.
- Specimens were divided into three groups: control (acid-etch + primer + bond), laser before bonding, and laser after bonding.
- Tensile bond strength was measured using a universal testing machine.
Main Results:
- Dentinal treatment with Nd:YAG laser significantly influenced tensile bond strength (ANOVA, p < 0.05).
- The control group and the laser-after-bonding group exhibited similar, higher bond strengths compared to the laser-before-bonding group.
- Laser application before bonding resulted in substantially lower tensile bond strength (4.57 MPa) than control (15.46 MPa) and laser-after-bonding (15.67 MPa) groups.
Conclusions:
- Nd:YAG laser application after bonding procedures yields comparable bond strength to conventional methods.
- Pre-bonding Nd:YAG laser treatment negatively impacts composite resin bond strength to dentin.
- Further research is warranted to elucidate the mechanism of hybrid layer formation with laser irradiation.