Surface conditioning of a composite used for inlay/onlay restorations: Effect on μTBS to resin cement
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Purpose: To assess the effect of the composite surface conditioning on the microtensile bond strength of a resin cement to a composite used for inlay/onlay restorations. Materials and Methods: Forty-two blocks (6 × 6 × 4 mm) of a microfilled composite (Vita VMLC) were produced and divided into 3 groups (N = 14) by composite surface conditioning methods: Gr1 - etching with 37% phosphoric acid, washing, drying, silanization; Gr2 - air abrasion with 50-l̀m Al2O3 particles, silanization; Gr3 - chairside tribochemical silica coating (CoJet System), silanization. Single-Bond (one-step adhesive) was applied on the conditioned surfaces and the two resin blocks treated with the same method were cemented using RelyX ARC (dual-curing resin cement). The specimens were stored for 7 days in water at 37°C and then sectioned to produce nontrimmed beam samples, which were submitted to microtensile bond strength testing (μTBS). For statistical analysis (one-way ANOVA and Tukey's test, · = 0.05), the means of the beam samples from each luted specimen were calculated (n = 7). Results: μTBS values (MPa) of Gr2 (62.0 ± 3.9a) and Gr3 (60.5 ± 7.9a) were statistically similar to each other and higher than Gr1 (38.2 ± 8.9b). The analysis of the fractured surfaces revealed that all failures occurred at the adhesive zone. Conclusion: Conditioning methods with 50-l̀m Al2O3 or tribochemical silica coating allowed bonding between resin and composite that was statistically similar and stronger than conditioning with acid etching.
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Composite Inlay Microtensile bond strength Surface conditioning Tribochemical silica coating aluminum oxide bisphenol A bis(2 hydroxypropyl) ether dimethacrylate dentin bonding agent ESPE bonding system macrogol derivative phosphoric acid polymethacrylic acid derivative RelyX ARC resin resin cement silane derivative silicon dioxide single bond unclassified drug water adhesion chemistry dental acid etching dental bonding dental etching dental surgery human materials testing mechanical stress surface property temperature tensile strength Acid Etching, Dental Adhesiveness Aluminum Oxide Bisphenol A-Glycidyl Methacrylate Composite Resins Dental Bonding Dental Etching Dentin-Bonding Agents Humans Inlays Materials Testing Phosphoric Acids Polyethylene Glycols Polymethacrylic Acids Resin Cements Silanes Silicon Dioxide Stress, Mechanical Surface Properties Temperature Tensile Strength Water
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Journal of Adhesive Dentistry, v. 9, n. 6, p. 495-498, 2007.
