Micro-tensile Bond Strength of a Contemporary Total-etch and Self-etch Adhesive after in vivo Degradation
Long-term durability of the bond between tooth and restorative material
is one of the most critical factors affecting the clinical performance of
adhesive restorations. Objectives: The aim of the study was to evaluate
the bonding effectiveness of a total-etch and a self-etch adhesive to dentin
after 6-month in-vivo service, using a micro-tensile bond strength
(µTBS) set-up and Fe-SEM. Methods: Class-I restorations were placed in
10 human caries-free third molars and pre-molars scheduled for extraction
(approved by Committee for Medical Ethics, Warshaw University). The cavities
were restored using either a three-step total-etch adhesive (OptiBond FL, Kerr)
or a ‘mild’ two-step self-etch adhesive (Clearfil SE, Kuraray) along with one
resin composite (Z100, 3M Espe). After 6 months of in-vivo service, the
teeth were extracted and 2-4 µTBS samples were prepared from each restoration.
Samples from in-vitro prepared restorations (stored for 24hr in water)
served as controls. Results:
µTBS (MPa)
24 hr in-vitro
ptf/n*
6-month in-vivo
ptf/n*
OptiBond FL
30.7 ± 11.5
0/20
27.9 ± 15.2
2/19
Clearfil SE
28.3 ± 8.3
0/16
23.4 ± 7.6
0/12
*ptf/n = Pre-testing failures/ number of samples
Two-way ANOVA and Scheffe’s statistical analysis (p<0.05) revealed
no significant bond degradation, nor any significant difference between both
adhesives tested. The 2 pre-testing failures recorded for the OptiBond FL in-vivo
group originated from upper third molars that were difficultly accessible,
which consequently may have led to inaccurate adhesive application. Conclusions:In-vivo degradation up to 6 months seemed not to influence the µTBS of
the tested total- and self-etch adhesive. Also Fe-SEM examination did not
reveal distinct ultra-morphologic features of bond degradation.
This study was supported by a Visiting Scholar Program from IADR-CED.
Division: IADR/PER General Session
Meeting:2003 IADR/PER General Session (Goteborg, Sweden) Location: Goteborg, Sweden
Year: 2003 Final Presentation ID:46 Abstract Category|Abstract Category(s):Dental Materials: I - Adhesion-Composite Bond Strength
Authors
Iracki, Jacek
( Medical University of Warsaw, Warsaw, N/A, Poland
)
De Munck, Jan
( Catholic University of Leuven, Leuven, N/A, Belgium
)
Shirai, Kenichi
( Hiroshima University, Hiroshima, N/A, Japan
)
Lambrechts, Paul
( Catholic University of Leuven, Leuven, N/A, Belgium
)
Van Meerbeek, Bart
( Catholic University of Leuven, Leuven, N/A, Belgium
)