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Effect of etchant variation on wet and dry dentin bonding primed with 4-META/acetone
1Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan. nobuo@i-mde.tmd.ac.jp
Summary
Wet bonding is crucial for effective dentin bonding when using 10-0 etching, as air-drying causes demineralized dentin collapse. However, 10-3 etching allows for strong tensile bond strength (TBS) with both wet and dry bonding methods.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Adhesive Dentistry
Background:
- Dentin bonding is essential for dental restorations.
- Understanding the mechanisms of wet versus dry bonding is critical for optimizing adhesive protocols.
- The interaction between etchants, dentin substrate, and bonding agents influences bond strength.
Purpose of the Study:
- To compare the efficacy of wet versus dry bonding techniques on dentin.
- To elucidate the mechanism underlying wet bonding in dentin adhesion.
- To evaluate the influence of different etching solutions on dentin bond strength.
Main Methods:
- Bovine dentin specimens were prepared and divided into four groups.
- Specimens were etched with either 10% citric acid/3% ferric chloride or 10% citric acid alone.
- Bonding was performed using a 4-methacryloyloxyethyl trimellitate anhydride (4-META) primer and resin, with subsequent tensile bond strength testing and SEM analysis.
Main Results:
- Tensile bond strengths (TBS) varied significantly based on etching and drying methods.
- The 10-3 etching group showed high TBS in both wet (18.9 MPa) and dry (18.1 MPa) conditions.
- The 10-0 etching group exhibited lower TBS when air-dried (5.4 MPa) compared to wet bonding (11.9 MPa), indicating dentin collapse.
Conclusions:
- The choice of etchant significantly impacts dentin bonding effectiveness.
- Air-drying after 10-0 etching leads to demineralized dentin collapse, necessitating wet bonding for optimal TBS.
- The 10-3 etching protocol, combined with the 4-META primer, promotes robust adhesion irrespective of the drying method.