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Incompatibility of self-etch adhesives with chemical/dual-cured composites: two-step vs one-step systems.
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2004
Year
Materials SciencePolymer ChemistryEngineeringChemical/dual-cured CompositesSelf-healing MaterialSelf-assemblyPolymer ScienceMechanical EngineeringTwo-step SystemsAdhesive MaterialLight CuringAdhesive MaterialsSelf-etch AdhesivesSelf-healing SurfaceOne-step SystemsStructural AdhesiveAdhesive TechnologiesSilver Tracer Penetration
This study tested the null hypothesis that there is no difference between two‑step and one‑step self‑etch adhesives in their compatibility with dual‑cured composites. The authors compared microtensile bond strengths of two two‑step self‑etch adhesives (Clearfil SE Bond, Kuraray and Tyrian SPE/One‑Step Plus, BISCO) with two one‑step systems (Xeno III, Dentsply DeTrey and Brush&Bond, Parkell) on a dual‑cured composite, and examined silver tracer penetration of the adhesives bonded to light‑ or chemically cured composites using TEM. Significant microTBS differences between composite curing modes appeared only for one‑step adhesives, which also showed TEM evidence of composite uncoupling and water‑tree channels at the adhesive‑composite interface, whereas two‑step adhesives exhibited no such defects.
This study tested the null hypothesis that there no difference between two-step and one-step self-etch adhesives in their compatibility with these composites. The microtensile bond strengths (microTBS) of two two-step systems (Clearfil SE Bond, Kuraray and Tyrian SPE/One-Step Plus, BISCO) were compared with two one-step systems (Xeno III, Dentsply DeTrey and Brush&Bond, Parkell) for their coupling to a dual-cured composite. Silver tracer penetration of the four adhesives bonded to a light-cured or a chemical-cured composite was examined using TEM. Significant differences in microTBSs between composite curing modes were seen only in the one-step adhesives. For one-step self-etch adhesives bonded to the chemical-cured composite, TEM revealed signs of frank composite uncoupling along the adhesive-composite interface, which may be attributed to the adverse chemical interaction between the acidic adhesive and the composite. In addition, "water trees" that represent channels of increased permeability with the polymerized adhesive layer were also observed in the one-step adhesives. Both features were absent along the resin-dentin interfaces when chemical-cured composites were coupled to the two-step self-etch adhesives.