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
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b
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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
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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]