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The Journal of Adhesive Dentistry

Edited by Prof. Dr. Roland Frankenberger, Prof. Bart Van Meerbeek

ISSN (print) 1461-5185 • ISSN (online) 1757-9988


November/December 2007
Volume 9 , Issue 6

Pages: 495-498
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Surface Conditioning of a Composite Used for Inlay/Onlay Restorations: Effect on TBS to Resin Cement

Valandro, Luiz Felipe / Pelogia, Fernanda / Galhano, Graziela / Bottino, Marco Antonio / Mallmann, Andre

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 x 6 x 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-m 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 37C 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-m Al2O3 or tribochemical silica coating allowed bonding between resin and composite that was statistically similar and stronger than conditioning with acid etching.

Keywords: composite, inlay, surface conditioning, microtensile bond strength, tribochemical silica coating

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