Dental and Medical Problems
2019, vol. 56, nr 4, October-December, p. 343–348
Publication type: original article
Effect of etching the coronal dentin with the rubbing technique on the microtensile bond strength of a universal adhesive system
Wpływ wytrawiania zębiny koronowej techniką wcierania na mikrorozciągliwą siłę wiązania uniwersalnego systemu adhezyjnego
1 Inserm UMR_S 1121, Biomaterials and Bioengineering, University of Strasbourg, France
2 Department of Conservative Dentistry and Endodontics, Faculty of Dental Medicine, University of Strasbourg, France
Background. The adhesion of composite resins to the dentin substrate is influenced by the treatment of the smear layer. While etch-and-rinse systems require dentin to be conditioned with phosphoric acid, self-etching systems preserve the smear layer by incorporating it into the adhesive layer.
Objectives. The objective of this study was to evaluate the influence of etching with the rubbing technique on the microtensile bond strength (μTBS) of a universal adhesive to dentin.
Material and Methods. Eighteen extracted teeth were selected. Two etch-and-rinse techniques (with and without rubbing) and a self-etching technique were used to bond the dentin surfaces with a universal adhesive system. After 24 h, the bonded samples were prepared for the μTBS testing. The specimens were loaded with a tensile force at a crosshead speed of 0.5 mm/min until failure. The scanning electron microscope (SEM) analyses were used to reveal the failure modes. The data were statistically analyzed with the one-way analysis of variance (ANOVA) and χ2 tests.
Results. The etch-and-rinse system with rubbing produced significantly lower bond strength (42.11 ±9.26 MPa,) than the etch-and-rinse system without rubbing (47.30 ±8.12 MPa) and significantly higher bond strength than the self-etching system (38.07 ±9.49 MPa).
Conclusion. Under the conditions of this study, dentin etched with phosphoric acid for 3 s in the etchandrinse mode with the rubbing technique for a universal adhesive system decreases the μTBS of the composite to dentin.
etching, phosphoric acid, universal adhesive, rubbing technique
wytrawianie, kwas fosforowy, uniwersalny materiał adhezyjny, technika wcierania
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