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The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

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

Publication:

March/April 2006
Volume 8 , Issue 2



Pages: 105-111
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Microtensile Bond Strength Between a Quartz Fiber Post and a Resin Cement: Effect of Post Surface Conditioning

Valandro, Luiz Felipe/Yoshiga, Silvia/de Melo, Renata Marques/Galhano, Graziela Avila Prado/Mallmann, Andre/Marinho, Cleverson Porto/Bottino, Marco Antonio

Purpose: To test the bond strength between a quartz-fiber-reinforced composite post (FRC) and a resin cement. The null hypothesis was that the bond strength can be increased by using a chairside tribochemical silica-coating system. Materials and Methods: Thirty quartz-FRCs (Light-Post) were divided into 3 groups according to the post surface treatment: G1) Conditioning with 32% phosphoric acid (1 min), applying a silane coupling agent; G2) etching with 10% hydrofluoric acid (1 min), silane application; G3) chairside tribochemical silica coating method (CoJet System): air abrasion with 30-μm SiOx-modified Al2O3 particles, silane application. Thereafter, the posts were cemented into a cylinder (5 mm diameter, 15 mm height) with a resin cement (Duo-Link). After cementation, the specimens were stored in distilled water (37C/24 h) and sectioned along the x and y axes with a diamond wheel under cooling (Labcut 1010) to create nontrimmed bar specimens. Each specimen was attached with cyanoacrylate to an apparatus adapted for the microtensile test. Microtensile testing was conducted on a universal testing machine (1 mm/min). The data obtained were submitted to the one-way ANOVA and Tukey test (α = 0.05). Results: A significant influence of the conditioning methods was observed (p < 0.0001). The bond strength of G3 (15.14 3.3) was significantly higher than the bond strengths of G1 (6.9 2.3) and G2 (12.60 2.8) (p = 0.000106 and p = 0.002631, respectively). Notwithstanding the groups, all the tested specimens showed adhesive failure between the resin cement and FRC. Conclusion: The chairside tribochemical system yielded the highest bond strength between resin cement and quartzfiber post. The null hypothesis was accepted (p < 0.0001).

Keywords: bond strength, fiber post, surface conditioning, tribochemical silica coating, microtensile test

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