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Quintessence Publishing: Journals: JAD


The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

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


January/February 2007
Volume 9 , Issue 1

Pages: 25-31
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Composite-to-Composite Microtensile Bond Strength in the Repair of a Microfilled Hybrid Resin: Effect of Surface Treatment and Oxygen Inhibition

Papacchini, Federica / Dall’Oca, Susanna / Chieffi, Nicoletta / Goracci, Cecilia / Sadek, Fernanda Tranchesi / Suh, Byoung I. / Tay, Franklin R. / Ferrari, Marco

Purpose: To compare the 24-h microtensile bond strength of a microfilled hybrid composite to the same material after mechanical and/or chemical treatment and assess the effect of oxygen inhibition on the composite-composite bond. Materials and Methods: Forty composite cylinders of Gradia Direct Anterior (GC) were prepared and stored 24 h prior to the following surface treatments: 50-μm aluminum oxide air abrasion and 37% phosphoric acid etching (group 1); hydrochloric acid and 6.9% hydrofluoric acid etching (group 2); diamond bur roughening and 37% phosphoric acid etching (group 3); diamond bur roughening (group 4). In all groups, Prime & Bond NT (Dentsply De Trey) was applied and light cured in air or under a nitrogen atmosphere, prior to layering a buildup of the repairing resin composite. Microtensile bond strength measurements were performed. Data were statistically analyzed with two-way ANOVA and Tukey’s test (α = 0.05). Results: The curing atmosphere did not significantly influence the interfacial strength (p < 0.05). Surface treatment significantly affected the composite-composite bond (p > 0.05). Air abrasion, regardless of curing atmosphere, resulted in the strongest bond (p < 0.05). The other treatments were comparable. Conclusion: Air abrasion and the application of a bonding agent offer satisfactory bond strengths for composite repair. The oxygen inhibition layer on a light-cured adhesive is not crucial to the success of the 24-h composite-composite bond.

Keywords: composite repair, surface treatment, oxygen-inhibited layer, microtensile bond strength.

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