Surface conditioning of a composite used for inlay/onlay restorations: Effect on μTBS to resin cement
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Data
2007-12-01
Autores
Valandro, Luiz Felipe
Pelogia, Fernanda [UNESP]
Galhano, Graziela [UNESP]
Bottino, Marco Antonio [UNESP]
Mallmann, Andre
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Resumo
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.