Shear vs. tensile bond strength of resin composite bonded to ceramic.

Department of Restorative Dentistry, University of Sheffield, United Kingdom.
Journal of Dental Research (Impact Factor: 3.83). 10/1995; 74(9):1591-6. DOI:10.1177/00220345950740091401
Source: PubMed

ABSTRACT Since the mode of failure of resin composites bonded to ceramics has frequently been reported to be cohesive fracture of either ceramic or resin composite rather than separation at the adhesive interface, this study was designed to question the validity of shear bond strength tests. The reasons for such a failure mode are identified and an alternative tensile bond strength test evaluated. Three configurations (A, conventional; B, reversed; and C, all composite) of the cylinder-on-disc design were produced for shear bond strength testing. Two-dimensional finite element stress analysis (FEA) was carried out to determine qualitatively the stress distribution for the three configurations. A tensile bond strength test was designed and used to evaluate two ceramic repair systems, one using hydrofluoric acid (HF) and the other acidulated phosphate fluoride (APF). Results from the shear bond strength tests and FEA showed that this particular test has as its inherent feature the measurement of the strength of the base material rather than the strength of the adhesive interface. In the tensile test, failure invariably occurred in the adhesive layer, with HF and APF showing a similar ability to improve the bond of resin composite to ceramic. It is concluded that the tensile bond strength test is more appropriate for evaluating the adhesive capabilities of resin composites to ceramics.

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    International Journal of Adhesion and Adhesives 04/2014; 50C:11-16. · 1.30 Impact Factor
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    ABSTRACT: Purpose: To measure the microshear bond strengths (μSBS) of composite resin to the intaglio surface of prefabricated indirect veneers and analyze the FE-SEM ultramorphology of the pretreated intaglio surfaces as well as the fracture modes. Materials and Methods: Three veneer systems (veneer and respective luting material) were used in this study: two prefabricated veneer types, Cerinate One-hour (CER, DenMat) and Componeer (CMP, Coltene), and a laboratory- made veneer, IPS e.max Press (IPS, Ivoclar Vivadent) used as the control. For each group, 10 veneers were used. After delimitation of the bonding area with a double-faced adhesive tape, 0.8-mm-diameter cylinders of composite luting material were bonded to the pretreated intaglio surface. After polymerization, the specimens were fractured in shear mode using the wire-loop method in a universal testing machine. The pretreated intaglio surface of two extra veneers and four fractured specimens per group were morphologically characterized using FE-SEM. Results: CER resulted in statistically lower mean μSBS (7.1 ± 1.2 MPa) than the other two veneer systems, CMP (15.2 ± 2.5 MPa) and IPS (14.7 ± 1.7 MPa) at p < 0.0001. As seen with the FE-SEM, the intaglio surface of CMP did not display microretentive features, while multiple microretentions were observed in both CER and IPS after HF etching. Conclusion: Within the limitations of this in vitro study, the CMP and IPS veneer systems resulted in greater bond strengths than those of the CER veneer system.
    The journal of adhesive dentistry 10/2013; · 0.91 Impact Factor
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    ABSTRACT: The aim of this in vitro study was to evaluate the effect of tribochemical silica-coating and a zirconate coupling agent application on bonding between a resin composite and zirconia. Firstly, it was hypothesized that the zirconate coupling agent modified surface would promote higher and more stable shear bond strength than a surface treated with tribochemical coating only. Secondly, the modified surface would retain its bond strength after artificial aging. The shear bond strength between a resin composite bonded to surface treated zirconia was measured. Hydrolytic stability of this bond was verified after water storage while the interface chemistry was evaluated using energy dispersive x-ray analysis. Surface treatment showed significantly greater shear bond strength compared with no treatment before artificial aging while specific surface treatments showed higher shear bond strength compared with no treatment after artificial aging. The predominant mode of failure after shear bond testing was adhesive. Energy dispersive x-ray analysis at the surface revealed elemental C1s, O1s, Si1s and Zr2p. As a result, tribochemical silica-coating followed by application of a zirconate coupling agent was suggested to create a successful a resin-to-zirconia bonding. Further investigation is required as reference for clinical approach in the cementation of zirconia restorations.
    International Journal of Adhesion and Adhesives 01/2014; 50:11–16. · 1.30 Impact Factor

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