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Influence of application methods of self-etching adhesive systems on adhesive bond strength to dentin
Patrícia Rondon Pleffken1, Ana Paula de Almeida Lourenço, Carlos Rocha Torres
1Sao Jose dos Campos School of Dentistry, Sao Paulo State University, SP, Brazil.
Purpose:
To assess the influence of variations in the application technique of self-etching adhesive systems on the shear bond strength to dentin.
Materials And Methods:
The buccal surface of 255 extracted bovine teeth was ground to expose a flat dentin surface; the teeth were divided into four experimental groups. The self-etching adhesive systems One Up Bond F Plus, Clearfil SE Bond, Xeno III, and FuturaBond NR were used, and the etch-and-rinse adhesive Adper Single Bond 2 was used as the control group. One or two layers of the self-etching systems were actively or passively applied. Cylinders of composite resin were bonded to dentin, and after 24 h, specimens were shear tested in a universal testing machine at a crosshead speed of 1 mm/min. The data were submitted to two-way ANOVA, Dunnett's and Tukey's test (5%).
Results:
There were significant differences for the factors adhesive type, application method, and their interaction. All adhesive systems showed significant differences. The active application of two layers of self-etching bonding systems resulted in a significantly higher mean than the passive application method.
Conclusion:
The active application of self-etching adhesive systems tends to increase the dentin shear bond strength, and the influence of the application method depends on the tested adhesive.
