Bond strength of adhesive resin cement with different adhesive systems.
BACKGROUND
To assess the immediate bond strength of a dual-cure adhesive resin cement to the hybridized dentin with different bonding systems.


METHODS
Fifty-six healthy human molars were randomly divided into 7 groups (n=8). After 3 longitudinal sections, the central cuts were included in PVC matrix and were submitted to dentin hybridization according to the groups: G1 - etch & rinse system with 3-step (Apder™ Scotchbond™ Multi-Purpose, 3M ESPE), G2 - etch & rinse system with 3-step (Optibond™ FL, Kerr), G3 - etch & rinse system with 3-step (All-Bond 3®, Bisco), G4 - etch & rinse simplified system (Adper™ Single Bond 2, 3M ESPE), G5 - self-etching system with one step (Bond Force, Tokuyama), G6 - universal system in moist dentin (Single Bond Universal, 3M ESPE), G7 - universal system in dry dentin (Single Bond Universal, 3M ESPE). Then all groups received the cementing of a self-adhesive resin cement cylinder (Duo-link, Bisco) made from a polypropylene matrix. In the evaluation of bond strength, the samples were subjected to the microshear test and evaluated according to the fracture pattern by optical microscopy.


RESULTS
The Kruskal-Wallis test suggests a statistically significant difference between groups (p=0,039), and Tukey for multiple comparisons, indicating a statistically significant difference between G3 and G4 (p<0.05). It was verified high prevalence of adhesive failures, followed by mixed failure and cohesive in dentin.


CONCLUSIONS
The technique and the system used to dentin hybridization are able to affect the immediate bond strength of resin cement dual adhesive.Key words:Adhesion, adhesive resin cement, adhesive systems, microshear.
DDS, MSc, Program of Health Science, University of Southern Santa Catarina, Tubarão, Santa Catarina, Brazil.
Fabrizio
F
Lorenzoni E Silva
DDS, MSc, Program of Health Science, University of Southern Santa Catarina, Tubarão, Santa Catarina, Brazil.
Saulo
S
Pamato
DDS, PhD, Department of Restorative Dentistry, Araraquara Dental School, Araraquara, SP, Brazil.
Milton-Carlos
MC
Kuga
DDS, MSc, PhD, Departament of Endodontics, Federal University of Rio Grande do Sul.
Marcus-Vinicius-Reis
MV
Só
DDS, MSc, Program of Health Science, University of Southern Santa Catarina, Tubarão, Santa Catarina, Brazil.
Jefferson-Ricardo
JR
Pereira