Abstracts of the Academy of Dental Materials Annual ... - IsiRed

e8 dental materials 26S (2010) e1–e84
in vivo studies are needed to clarify the clinical performance
of simplified adhesives.
doi:10.1016/j.dental.2010.08.022
15
Effect of chlorhexidine on 6-months bond strength of resinglass-modified-ionomer
to dentin
E. Dursun, J.P. Attal
University of Paris Descartes, France
Objectives: The purpose of this study was to investigate
the effect of chlorhexidine (CHX) on dentin bond strength of
resin-modified glass-ionomer (RMGI) after 24 h and 6 months
of water storage.
Materials and methods: 60 human teeth with a flat surface
of dentin were embedded in blocks of resin. 60 cylinders
of RMGI (Fuji LCII ® (GC)) were bonded on 60 teeth following
various modalities: 30 after polyalkenoic acid (ac pol) treatment,
30 after polyalkenoic acid treatment and an application
of 0.05% chlorhexidine (CHX). One subgroup (n = 15) was tested
after 24 h in water at 37 ◦ C and the other subgroup (n = 15)
after 6-month storage in water. A shear bond strength (SBS)
test was performed. The data (in MPa) were analyzed with
ANOVA and Tukey tests (p < 0.05). The type of bond failure
(mixed/adhesive/cohesive) was noted and analyzed with a chisquare
test (p < 0.05).
Results:
Dentin treatment, material and time Dentin SBS (MPa)
Ac Pol + RMGI 24 h 8 ± 1 (a)
AcPol+Chx+RMGI24h 9 ± 3 (a)
Ac Poly + RMGI 6 months 12 ± 4 (b)
Ac Pol + Chx + RMGI 6 months 9 ± 3 (a)
Letters in parentheses = homogeneous subsets.
After 24 h, there were no significant differences on dentin
SBS of RMGI with or without application of chlorhexidine.
After 6 months, the dentin SBS increased in the samples that
had not been treated with chlorhexidine, and did not increase
in those that had been treated with chlorhexidine.
No significant differences in debonding locations were
found between the various groups tested with 100% of adhesive
failures.
Conclusions: Chlorhexidine application does not seem to
disturb the dentin SBS of RMGI after 24 h. However, the dentin
SBS of RMGI seems to increase after 6 months and application
of chlorhexidine may inhibit this increase.
doi:10.1016/j.dental.2010.08.023
16
Bonding effectiveness of all-in-one adhesives
H.M. El-Damanhoury 1 , N.A. El-Sahn 2 , A.N. Habib 2 , K.B.
Moore 3
1 University of Sharjah, UAE
2 Cairo University, Egypt
3 Indiana University, IN, USA
Objectives: To evaluate the bonding effectiveness of
six all-in-one adhesives to dentin by testing micro-tensile
bond strength (�-TBS) and micrographic analysis of the
resin/adhesive interface.
Materials and methods: Flat occlusal dentin was exposed
in 128 extracted human molars. Teeth were equally divided
into 16 groups (8 teeth each). Two groups were randomly
assigned for each all-in-one adhesive and controls: Clearfil
S3 (S3-kuraray); G-Bond (GB-GC dental); iBond (IB-Heraeus
Kulzer); Xeno V (XB-Dentsply); Optibond All-in-one (OB-Kerr)
and Adper Easy Bond (AEB-3M ESPE). Adper ScotchBond SE
(ASE-3M ESPE) was used as two-bottle self-etch control and
Adper Single Bond Plus (SB-3M ESPE) as etch-and-rinse control.
Specimens were restored with Filtek Z250 Composite (3M
ESPE). One group for each material was thermocycled (TC). �-
TBS to dentin was measured in a universal testing machine.
Mode of failure of debonded beams was examined under SEM.
Micrographic analysis of the bonded interface of demineralized/deproteinized
samples was done using SEM. All data were
analyzed by one-way ANOVA and multiple comparisons was
done using Tukey’s test (p < 0.05).
Results: SB presented the highest �-TBS (58.17 ± 10.1 MPa)
and a reduction of 25.12% after TC, with resin tags >40 �m,
while GB (53.40 ± 9.6 MPa) showed the least reduction in �-TBS
after TC (14.71%). OB (48.40 ± 8.0 MPa) exhibited the highest
reduction in �-TBS (31.16%) and resin tags >40 �m. XB presented
the lowest �-TBS (25.88 ± 5.5 MPa) with reduction of
22.06% after TC. All-in-one adhesive showed mixed type of
failure, except for GB and XB, which failed cohesively within
the adhesive layer.
Conclusions: Etch and rinse adhesive systems remain as
the gold standard for bonding to dentin, meanwhile some of
the all-in-one adhesives demonstrate promising results concerning
the bond strength and durability after thermocyclying.
There is no direct relation between depth of infiltration in
dentin and bond strength of adhesives.
doi:10.1016/j.dental.2010.08.024
17
Influence of surface pretreatment on the short term bond
strength of composite resin to a zirconia-based material
G. Fazi, A. Vichi, M. Ferrari
University of Siena, Italy
Objectives: The purpose of the present study was to evaluate
the influence of sandblasting zirconia before and after
sintering on the bond strength between a zirconia core and a
composite resin material.