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Volume 19 , Issue 6
November/December 2006

Pages 606–609

Does the Thickness of the Resin Cement Affect the Bond Strength of a Fiber Post to the Root Dentin?

Bianca E. M. Perez, DDS / Silvia H. Barbosa, MS / Renata M. Melo, MS / Sandra C. Zamboni, DDS / Mutlu Özcan, DMD, PhD / Luiz Felipe Valandro, MSc, PhD / Marco A. Bottino, PhD

PMID: 17165301

This study aimed to evaluate the influence of cement thickness on the bond strength of a fiber-reinforced composite (FRC) post system to the root dentin. Eighteen single-rooted human teeth were decoronated (length: 16 mm), the canals were prepared, and the specimens were randomly allocated to 2 groups (n = 9): group 1 (low cement thickness), in which size 3 FRC posts were cemented using adhesive plus resin cement; and group 2 (high cement thickness), in which size 1 FRC posts were cemented as in group 1. Specimens were sectioned, producing 5 samples (thickness: 1.5 mm). For cement thickness evaluation, photographs of the samples were taken using an optical microscope, and the images were analyzed. Each sample was tested in push-out, and data were statistically analyzed. Bond strengths of groups 1 and 2 did not show significant differences (P = .558), but the cement thicknesses for these groups were significantly different (P < .0001). The increase in cement thickness did not significantly affect the bond strength (r2 = 0.1389, P = .936). Increased cement thickness surrounding the FRC post did not impair the bond strength. Int J Prosthodont 2006;19:606–609.

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