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Critical appraisal: adhesive-composite incompatibility, part I
Ricardo M Carvalho1, Fernanda Cristina P Garcia, Safira M A E Silva
1Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil. ricfob@fob.usp.br
Summary
Dental professionals assumed resin composites were universally compatible. However, simplified adhesive systems can react with self- or dual-cured composites, causing debonding and reduced bond strength.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Restorative Dentistry
Background:
- Methacrylate-based resins in dental composites were presumed compatible.
- Clinicians widely use various composite types and brands without issue.
- Bonding resin composites to all adhesive systems was considered reliable.
Purpose of the Study:
- To investigate reported unexpected debonding of self-cured composites bonded with simplified adhesive systems.
- To elucidate the compatibility issues between simplified adhesives and self/dual-cured composites.
- To understand the mechanisms behind compromised bonding in specific dental material combinations.
Main Methods:
- Review of critical studies investigating resin composite compatibility.
- Analysis of chemical interactions between simplified adhesive monomers and self/dual-cured composite initiators.
- Evaluation of the role of simplified adhesive system permeability in bonding efficacy.
Main Results:
- Compatibility problems exist between simplified adhesive systems and self- or dual-cured resin composites.
- Adverse chemical reactions between acidic adhesive monomers and basic tertiary amines in composites reduce bond strength.
- Permeability of simplified adhesive systems also contributes to compromised bonding.
Conclusions:
- Simplified adhesive systems are not universally compatible with all resin composites, particularly self- and dual-cured types.
- Clinical failures can occur due to chemical incompatibility and material permeability.
- These findings have significant implications for core buildup materials, indirect restorations, and post bonding.