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Incremental layers bonding of silorane composite: the initial bonding properties
A Tezvergil-Mutluay1, L V J Lassila, P K Vallittu
1Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, FIN-20520 Turku, Finland. arztez@utu.fi
Journal of Dentistry
|May 10, 2008
Summary
Silorane composite shows slightly lower incremental bonding than dimethacrylate composites. Bonding silorane to dimethacrylate requires a specific intermediate resin to ensure adequate bond strength.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Silorane composites utilize cationic polymerization, lacking an oxygen inhibition layer crucial for incremental bonding.
- This characteristic raises concerns about the layer-to-layer adhesion of silorane-based dental restorations.
- Understanding bonding efficacy is vital for clinical success and longevity of dental composites.
Purpose of the Study:
- To evaluate the shear bond strength (SBS) between incremental layers of silorane composite.
- To compare the bonding of silorane to itself and to dimethacrylate-based composites.
- To assess the influence of aging and intermediate adhesive resins on bond strength.
Main Methods:
- Silorane and dimethacrylate composites were bonded incrementally to aged or fresh substrates.
- Shear bond strength (SBS) was measured after 24-hour water storage.
- Failure modes were analyzed to understand bond integrity.
Main Results:
- Dimethacrylate-dimethacrylate bonds exhibited the highest SBS (33.0 MPa).
- Silorane-silorane SBS decreased with substrate aging (26.7 MPa to 22.4 MPa), with increased adhesive failures.
- Bonding silorane to dimethacrylate yielded low SBS (4.0 MPa) unless a phosphate-methacrylate intermediate resin was used.
Conclusions:
- Silorane composite demonstrates slightly inferior incremental bonding compared to conventional dimethacrylate composites.
- A phosphate-methacrylate-based intermediate resin is essential for achieving reliable bonds between silorane and dimethacrylate composites.
- Further research may explore modifications to enhance silorane's inherent layer-to-layer adhesion.
