IADR Abstract Archives
Bond strength between one-step adhesives and dentin after cyclic loading
Abstract: Objectives: The purpose of this study was to investigate the influence of mechanical load cycling on the dentin bond strengths of four different one-step self-etch adhesives.
Methods: Clearfil Tri-S bond (Tri-S, Kuraray Noritake Dental), BeautiBond (B-Bond, Shofu), Bond Force (Bond-F, Tokuyama Dental), and G-Bond Plus (G-Bond, GC) were used as adhesives. Extracted non-carious human molars were sectioned at the cemento-enamel junction to expose the dentin and were ground flat with 600 grit silicon carbide papers. Dentin surfaces were treated according to the manufacturers' instructions for each adhesive and a light-curing resin-composite material was built up on the surface. All specimens were immersed in water at 37 ºC for 24 h. Half of the specimens were tested for micro-tensile bond strength at a crosshead speed of 0.5 mm/min (0-cycle). The remaining half of the specimens were subjected to a vertical load (75.6 N, 1.2 Hz) on the top surface of resin composite with a 15º rotation using an acrylic stylus for 200,000 cycles, after which the micro-tensile bond strengths were determined (200,000-cycle). The data were analyzed by two-way ANOVA and a Tukey-Kramer HSD test at a statistical significance of 0.05.
Results: The mean bond strengths were G-Bond/0-cycle (78.3 MPa), Tri-S/0-cycle (70.9 MPa), B-Bond/0-cycle (67.3 MPa), B-Bond/200,000-cycle (67.2 MPa), Tri-S/200,000-cycle (62.5 MPa), G-Bond/200,000-cycle (54.4 MPa), Bond-F/200,000-cycle (50.0 MPa), and Bond-F/0-cycle (44.7 MPa). Tri-S and B-Bond exhibited relatively high bond strengths before loading that did not significantly change after 200,000 cycles (high). G-Bond had a high bond strength before loading that significantly decreased after 200,000 cycles (slope). Bond-F resulted in a relatively low bond strength before loading that did not significantly decrease after 200,000 cycles (moderate).
Conclusions: The influence of mechanical load cycling on the bond strength between one-step self-etch adhesives and dentin could be divided into three categories: high, slope, and moderate.
Methods: Clearfil Tri-S bond (Tri-S, Kuraray Noritake Dental), BeautiBond (B-Bond, Shofu), Bond Force (Bond-F, Tokuyama Dental), and G-Bond Plus (G-Bond, GC) were used as adhesives. Extracted non-carious human molars were sectioned at the cemento-enamel junction to expose the dentin and were ground flat with 600 grit silicon carbide papers. Dentin surfaces were treated according to the manufacturers' instructions for each adhesive and a light-curing resin-composite material was built up on the surface. All specimens were immersed in water at 37 ºC for 24 h. Half of the specimens were tested for micro-tensile bond strength at a crosshead speed of 0.5 mm/min (0-cycle). The remaining half of the specimens were subjected to a vertical load (75.6 N, 1.2 Hz) on the top surface of resin composite with a 15º rotation using an acrylic stylus for 200,000 cycles, after which the micro-tensile bond strengths were determined (200,000-cycle). The data were analyzed by two-way ANOVA and a Tukey-Kramer HSD test at a statistical significance of 0.05.
Results: The mean bond strengths were G-Bond/0-cycle (78.3 MPa), Tri-S/0-cycle (70.9 MPa), B-Bond/0-cycle (67.3 MPa), B-Bond/200,000-cycle (67.2 MPa), Tri-S/200,000-cycle (62.5 MPa), G-Bond/200,000-cycle (54.4 MPa), Bond-F/200,000-cycle (50.0 MPa), and Bond-F/0-cycle (44.7 MPa). Tri-S and B-Bond exhibited relatively high bond strengths before loading that did not significantly change after 200,000 cycles (high). G-Bond had a high bond strength before loading that significantly decreased after 200,000 cycles (slope). Bond-F resulted in a relatively low bond strength before loading that did not significantly decrease after 200,000 cycles (moderate).
Conclusions: The influence of mechanical load cycling on the bond strength between one-step self-etch adhesives and dentin could be divided into three categories: high, slope, and moderate.