IADR final data 20130715.cdr
Transcription
IADR final data 20130715.cdr
Bonding effectiveness of fiber-reinforced composite to dentin. a a b a Takashi Washino , Jan De Munck , Annelies Van Ende , Atsushi Mine , Bart Van Meerbeek a b 524 a KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven (University of Leuven) & Dentistry, University Hospitals Leuven, Belgium Department of Fixed Prothodontics, Osaka University Graduate School of Dentistry, Osaka, Japan Fiber-reinforced composites have excellent properties to replace large tooth defects. Adhesion to human dentin may however be compromised, especially when applied in bulk. Light microscopy image of EverX Posterior (GC, Japan) Methodology 2 mm or a a b µTBS (MPa) Micro-tensile bond strength (µTBS) 300 µm 4 mm bulk a* 60 50 40 30 20 10 0 GB everX GB G-bulk GB G-layer OFL everX GB everX GB G-bulk GB G-layer OFL everX layer *1-way ANOVA & Tukey multiple comparisons Failure analysis H2O 1 week 100 80 60 pre-testing failures = 0 MPa composite 40 interface µTBS 20 SEM 0 dentin C F SEM of a fracture surface The majority of the specimens failed cohesively in the composite (C). Fibers (F) are commonly exposed on the surface and fail at the resin-fiber interface (hand pointer). Ar Ar Cr I Specimens that failed close to the interface, mainly failed at the adhesive-composite interface (Ar), only smaller areas failed at the resin-dentin interface (I). High magnification SEM showing good adaptation between the adhesive resin and the resin of the fiber-reinforced composite (Cr). Optibond FL + everX posterior JSM-6610LV, Jeol, Japan Optibond FL + everX posterior G-aenial Bond + EverX Posterior LRX Lloyd, UK C Ar F I SEM of a fracture surface The majority of the specimens failed partly cohesively in the composite (C). 4 mm bulk-fill Fracture often occurs parallel to the fiber orientation. 2 x 2 mm layer C C Ar I I SEM of a fracture surface The majority of the specimens failed at the interface between composite and adhesive resin (Ar), which might be related to improper curing at this region due to the bulkcuring. SEM of a fracture surface Specimens fail either at the interface or cohesively in the composite. CONCLUSION Conclusion: When applied in 4-mm bulk, the fiber-reinforced composite bonded, irrespective of the adhesive employed, equally effective to bur-cut dentin as the conventional paste-like composite that however needed to be applied/cured in two 2-mm layers. biomat leuven research cluster [email protected]