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The Journal of Adhesive Dentistry

Edited by Prof. Dr. Roland Frankenberger, Prof. Bart Van Meerbeek

ISSN (print) 1461-5185 • ISSN (online) 1757-9988


March/April 2006
Volume 8 , Issue 2

Pages: 75-83
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Does the Acidity of Self-etching Primers Affect Bond Strength and Surface Morphology of Enamel?

Moura, Sandra Kiss/Pelizzaro, Arlete/Bianco, Karen Dal/de Goes, Mario Fernando/Loguercio, Alessandro Dourado/Reis, Alessandra/Grande, Rosa Helena Miranda

Purpose: This study examined the ultrastructure and microtensile bond strengths (TBS) of self-etching (with different acidity) and conventional adhesive systems bonded to unground enamel. Materials and Methods: Resin composite (Filtek Z250) buildups were bonded to unground enamel surfaces of third molars after adhesive application with the following materials: Clearfil SE Bond (CSE); Optibond Solo Plus Self-Etch (OP); Tyrian Self Priming Etching (TY), and the controls Scotchbond Multi-Purpose Plus (SBMP) and Single Bond (SB). Six teeth were assigned to each material. After storage in water for 24 h at 37C, the bonded specimens were sectioned into beams of approximately 0.8 mm2 and subsequently subjected to μTBS testing at a crosshead speed of 0.5 mm/min. The average values were subjected to one-way ANOVA (α = 0.05). The effect of surface conditioning of each material was observed under scanning electron microscopy (SEM). Results: The highest resin-enamel bond strength was observed for SBMP (22.7 5.2) and SB (26.7 5.2 MPa). The lowest mean bond strengths were 10.9 3.2 and 7.8 1.5 MPa for TY and OP, respectively. CSE showed an intermediate performance (18.7 4.6 MPa). An overall increase in porosity was evident along the entire enamel surface treated with the self-etching primers; however, no selective demineralization similar to that with 35% phosphoric acid was observed. Conclusion: The highest bond strength means and the more retentive etching pattern were observed for the two-step etch-and-rinse adhesives. Among the self-etching systems studied, Clearfil SE Bond should be preferred.

Keywords: adhesive system, bonding, enamel morphology

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