Bond Capability of Universal Adhesive Systems to Dentin in Self-etch Mode after Short-term Storage and Cyclic Loading.

Daniele Morosini Costa,Gilberto Antonio Borges,Deise Caren Somacal,Ana Maria Spohr

doi:10.2174/1874210601711010276

Daniele Morosini Costa, Gilberto Antonio Borges + Show 2 more

Open Access

https://doi.org/10.2174/1874210601711010276

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Abstract

Objective: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.Results: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.Conclusion: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.

Highlights

Self-etch adhesive systems differ technically from etch and rinse adhesive systems due to the elimination of 35% phosphoric acid etching and, elimination of the step of water removal after etching [1]
The means followed by the same letter represent no significant difference in the bond strength (MPa) after 24 h: One Coat 7 Universal (OC7)=7.86A (±2.90), Scotchbond Universal (SU)=6.78AB (±2.03), All-Bond Universal (AU)=5.61BC (±2.32), and SE=3.53C (±1.89)
According to Tukey’s test, without cyclic loading, higher tensile bond strength was obtained with One Coat 7 Universal (7.86 MPa), though not significantly different from that of Scotchbond Universal (6.78 MPa) (p>0.05)

Summary

Introduction

Self-etch adhesive systems differ technically from etch and rinse adhesive systems due to the elimination of 35% phosphoric acid etching and, elimination of the step of water removal after etching [1]. Self-etch adhesive systems present acidic monomers that are responsible for enamel and dentin demineralization [2]. The Open Dentistry Journal, 2017, Volume 11 277 the acidic monomers, enabling them to demineralize the smear layer and the underlying dentin to form the hybrid layer [4, 5]. These adhesive systems can be classified according to their pH as strong (pH ≤1), intermediate (pH = 1.5), or mild (pH >2) [6]. Self-etch adhesive systems do not provide a selective demineralization of the enamel similar to that with 35% phosphoric acid [8]. Selective enamel etching in a separate step with 35% phosphoric acid has been recommended prior to application of the self-etching adhesive system [9]

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