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Shear bond strength of an autopolymerizing core buildup composite bonded to dentin with 9 dentin adhesive systems
1School of Dentistry, University of the Pacific, San Francisco, CA 94115, USA. mhagge@sf.uop.edu
Statement Of Problem:
Clinicians have reported unexpected debonding of autopolymerizing composite core buildups. It has been postulated that dentin adhesive systems that incorporate a combined primer-adhesive may be incompatible with autopolymerizing composites. If so, large numbers of existing restorations may be predestined for early failure.
Purpose:
This in vitro investigation examined the shear bond strength values of an autopolymerizing core buildup composite bonded to dentin with 9 dentin adhesive systems.
Material And Methods:
Cylinders of the core buildup composite (2.38-mm diameter) were bonded to moist dentin according to the manufacturers' instructions. Specimens were stored in 37 degrees C water for 1 week, thermocycled (5 degrees C to 55 degrees C, 30-second intervals, 1000 cycles), and returned to water storage overnight. Specimens then were debonded with a universal testing machine at 1.0 mm/min, with results recorded in megapascals. Data were statistically analyzed with a Kruskal-Wallis test, with pairwise Wilcoxon rank sum (Mann-Whitney) tests used to determine significant (P<.05) differences between groups.
Results:
The dentin adhesive systems in order of decreasing median bond strength were Optibond FL > One Step, All-Bond 2, Clearfil SE, Amalgambond Plus > Single Bond, Optibond Solo Plus, Tenure > Scotchbond MP.
Conclusion:
No predictable relationship was found between the general formulation of the dentin adhesive agents and shear bond strength values. Material incompatibilities were judged to be dependent on formulation.
