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Quintessence International



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Quintessence Int 38 (2007), No. 4     13. Mar. 2007
Quintessence Int 38 (2007), No. 4  (13.03.2007)

Online Article, Page 358, PubMed:17530053

Online Article: Bond strength of adhesives to dentin involving total and self-etch adhesives
Hürmüzlü, Feridun / Ozdemir, A. Kemal / Hubbezoglu, Ihsan / Coskun, Akin / Siso, Seyda Herguner
Objective: Currently, the trend in dentin adhesion seems to be shifting from moist bonding systems to self-etching systems and from several application steps to single steps. However, recent studies have indicated that the performance of single-step adhesives was lower than the 2-step self-etch or total etch systems. In the present study, microtensile bond strength of a total etch, 2-step self-etch and single-step self-etch adhesives was comparatively evaluated. Method and Materials: The superficial occlusal dentin of 12 noncarious extracted human molars was exposed, finished with wet 600-grit silicon carbide paper, and a block of resin composite bonded with adhesives according to the manufacturers' instructions. The teeth were kept in tap water for 24 hours at 37°C and sectioned to produce beams, with adhesive areas of ± 0.9 mm2 (4 beams per tooth were obtained). The specimens were stressed at a crosshead speed of 1 mm per minute until the bonds ruptured.
Results: The mean bond strengths were calculated as MPa and compared by performing analysis of variance and Tukey tests to identify significant differences between the materials (P = 0.05). The mean bond strength of Clearfil SE Bond was significantly higher than that of OptiBond Solo Plus and iBond (P < .05). OptiBond Solo Plus gave significantly higher bond strengths than iBond (P < .05).
Conclusions: The self-etching adhesive system Clearfil SE Bond (2 step) had higher bond strength than the 1-bottle self-etching adhesive iBond (single application) and the 2-step single-bottle system OptiBond Solo Plus (total etch). However, the 1-bottle adhesive system OptiBond Solo Plus (total etch system) had higher bond strength than the 1-bottle self-etching adhesive system iBond.

Keywords: acid etching, dentin, dentin adhesive, failure mode, layer, microtensile bond strength