Microrotary fatigue resistance of a HEMA-free all-in-one adhesive bonded to dentin.
OBJECTIVE
To determine the effect of thorough air drying on the static and dynamic bonding effectiveness of a HEMA-free all-in-one adhesive bonded to Class-1 cavity-bottom dentin.


METHODS
G-Bond (GC, Japan) was applied to standard occlusal Class I cavities following either a gentle (1 bar) or strong (4 bar) air-drying technique. After restoring the cavity using a composite resin (Gradia Anterior, GC), microspecimens were prepared that were loaded until failure or inserted in a microrotary fatigue testing device.


RESULTS
Strong air drying had no effect on the static (39.1 vs. 38.4 MPa) or the dynamic (19.0 vs. 18.6 MPa) strength of the interface complex.


CONCLUSIONS
Strong air drying did not improve the static or the dynamic bonding effectiveness, although a very thorough (4 bar) and long air-drying procedure was employed. SEM analysis revealed that even when the adhesive was strongly air dried, droplets originating from phase separations could still be observed, albeit to a reduced extent. Ineffective drying and pooling of the adhesive in a narrow cavity diminished the effect of strong air drying of the all-in-one adhesive.
De Munck
Jan
J
Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillofacial Surgery, Catholic University of Leuven, Leuven, Belgium. jan.demunck@med.kuleuven.be
Arita
Akishi
A
Shirai
Kenichi
K
Van Landuyt
Kirsten L
KL
Coutinho
Eduardo
E
Poitevin
André
A
Peumans
Marleen
M
Lambrechts
Paul
P
Van Meerbeek
Bart
B
D000388:Air; D001840:Dental Bonding / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D016015:Logistic Models; D008689:Methacrylates / Q000737:chemistry*; D013718:Tensile Strength
D017220:Dentin-Bonding Agents; C498353:G-Bond; D008689:Methacrylates