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Can cement film thickness influence bond strength and fracture resistance of fiber reinforced composite posts?

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Abstract

Objectives

This study compared the influence of cement film thickness (CFT) on bond strength (BS) and fracture resistance (FR) of fiber-reinforced composite (FRC) posts to root canal.

Materials and methods

One hundred bovine incisors were used for BS and FR analysis (n = 10) and distributed into five experimental groups according to FRC post diameters (WhitePost DC no. 0.5, no. 1, no. 2, no. 3, no. 4), leading to five different CFTs. The canals were prepared using drill no. 4 provided by the post manufacturer and irrigated with 2.5 % NaOCl. After conditioning (24 % H2O2/5 min) and silanization, posts were cemented with resin cement. BS was evaluated using push-out test and FR using the compression test at 45°. A stereomicroscope was used to measure CFT and to analyze failure pattern. BS data were subjected to two-way ANOVA and Scheffé test for contrast (α = 0.05); FR data were subjected to one-way ANOVA.

Results

BS was significantly affected by CFT, as the most well-adapted post achieved the highest values (p < 0.05). BS was similar for all root thirds. CFT did not affect fracture resistance. No root fractures were observed.

Conclusions

A FRC post well adapted to the root canal results in higher BS values. Different CFTs did not influence the FR of teeth restored with FRC posts.

Clinical relevance

The results indicate that post retention is improved when a well-adapted post is used, although this has not been critical to fracture resistance.

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Acknowledgments

The study was supported by the Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ E-26/110.408/2011), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

Compliance with ethical standards

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Conflict of interests

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

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Authors and Affiliations

  1. Analytical Laboratory of Restorative Biomaterials (LABiom-R), School of Dentistry, Federal Fluminense University, Rua Mario Santos Braga, nº30, 3º andar Campus do Valonguinho, Centro, Niterói, Rio de Janeiro, CEP 24.020-140, Brazil

    Alice Gonçalves Penelas, Valery Martins Piedade, Ana Carolina Oliveira da Silva Borges, Laiza Tatiana Poskus, Eduardo Moreira da Silva & José Guilherme Antunes Guimarães

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  1. Alice Gonçalves Penelas
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  2. Valery Martins Piedade
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  3. Ana Carolina Oliveira da Silva Borges
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  4. Laiza Tatiana Poskus
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  5. Eduardo Moreira da Silva
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  6. José Guilherme Antunes Guimarães
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Correspondence to José Guilherme Antunes Guimarães.

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Penelas, A.G., Piedade, V.M., Borges, A.C.O.d.S. et al. Can cement film thickness influence bond strength and fracture resistance of fiber reinforced composite posts?. Clin Oral Invest 20, 849–855 (2016). https://doi.org/10.1007/s00784-015-1568-3

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  • DOI: https://doi.org/10.1007/s00784-015-1568-3

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