Bond Capability of Universal Adhesive Systems to Dentin in Self-etch Mode after Short-term Storage and Cyclic Loading
Daniele Morosini Costa1, Deise Caren Somacal1, Gilberto Antonio Borges2, Ana Maria Spohr3, *
1 Department of Restorative Dentistry, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
2 Department of Restorative Dentistry, Uberaba University, Uberaba, Brazil.
3 Department of Dental Materials, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, Brazil.
The aim was to evaluate, in vitro, the tensile bond strength to dentin of Scotchbond Universal (SU), All-Bond Universal (AU) and One Coat 7 Universal (OC7) adhesives applied in self-etch mode, after 24 h of storage and after 500,000 loading cycles, using Clearfil SE Bond (SE) as a control.
Materials and Methods:
The adhesives were applied on the dentin of bovine teeth, followed by the application of a composite resin. Thirty specimens were obtained for each adhesive. Half of the specimens were submitted to cyclic loading for 500,000 cycles. All specimens were submitted to a tensile bond strength test in a universal testing machine at a crosshead speed of 0.5 mm/minute.
According to two-way ANOVA and Tukey’s test (α=5%), the interaction between the adhesive and cyclic loading factors was significant (p=0.001). The means followed by the same letter represent no significant difference in the bond strength (MPa) after 24 h: OC7=7.86A (±2.90), SU=6.78AB (±2.03), AU=5.61BC (±2.32), and SE=3.53C (±1.89). After cyclic loading, SE, SU and AU maintained bond strength comparable to 24 h period. There was a significant decrease only for OC7.
SU, AU and OC7 had bond strength to dentin comparable to that of SE. Only OC7 had decreased bond strength to dentin after cyclic loading.
Keywords: Bond strength, Dentin, Universal adhesives, Composite resin, Bovine teeth.
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* Address correspondence to this author at the Department of Dental Materials, School of Dentistry, Pontifical Catholic University of Rio Grande do Sul, Brazil; Tel: +55-51-33202338; Fax: +55-51-3320-3538, E-mail: email@example.com