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The diffusion kinetics of a nanofilled and a midifilled resin composite immersed in distilled water, artificial saliva, and lactic acid

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Abstract

This study investigated the diffusion kinetics of a nanofilled (Filtek Z350) and a midifill (Filtek P60) resin composite immersed in distilled water, artificial saliva and lactic acid. Resin composite specimens were desiccated, immersed in the media, weighed at suitable time intervals until they reached sorption equilibrium and were then desiccated again. Sorption and solubility (µg/mm3) were calculated based on ISO 4049:2000(E). The diffusion coefficient (m2.s−1) was determined according to Flick’s second law. The degree of conversion (DC%) was evaluated by FT-IR and the action of the media on the surfaces of the resin composite was evaluated by SEM. Z350 immersed in lactic acid presented the highest sorption (25.9 ± 1.3). The highest solubility was presented by Z350 immersed in lactic acid (5.6 ± 0.9), followed by P60 immersed in lactic acid (4.4 ± 0.5). The other groups presented no significant difference among them. The diffusion coefficients of both resin composites immersed in lactic acid and that of Z350 immersed in artificial saliva were significantly higher. The lowest diffusion coefficient was presented by P60 immersed in distilled water. The DC% was not significant, (p > 0.05). The SEM analysis showed that the effect of lactic acid on the resin composites was more deleterious than those of water and artificial saliva.

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Acknowledgements

This study was supported by a grant (E-26/171.432/2004) from Rio de Janeiro Research Foundation (FAPERJ). The authors would like to thank 3M ESPE for supplying the Z350 and P60 dental composites; the Institute of Macromolecules (IMA) of the Federal University of Rio de Janeiro (UFRJ)—for performing the degree of conversion measurements, and the Electronic Microscopy Laboratory/PEMM of UFRJ—for performing the SEM analysis.

Conflict interest declaration

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Restorative Dentistry, School of Dentistry, Federal Fluminense University, Niterói, Rio de Janeiro, Brazil

    Eduardo Moreira da Silva, Luana Gonçalves, José Guilherme Antunes Guimarães & Laiza Tatiana Poskus

  2. Institute of Physics, Federal Fluminense University, Avenida Litorânea, Niterói, Rio de Janeiro, Brazil

    Carlos Eduardo Fellows

  3. Universidade Federal Fluminense / Faculdade de Odontologia - Rua São Paulo, nº 28–Campus Valonguinho, Centro, Niterói, Rio de Janeiro, 24040-110, Brazil

    Eduardo Moreira da Silva

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  1. Eduardo Moreira da Silva
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  2. Luana Gonçalves
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  3. José Guilherme Antunes Guimarães
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  4. Laiza Tatiana Poskus
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Correspondence to Eduardo Moreira da Silva.

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da Silva, E.M., Gonçalves, L., Guimarães, J.G.A. et al. The diffusion kinetics of a nanofilled and a midifilled resin composite immersed in distilled water, artificial saliva, and lactic acid. Clin Oral Invest 15, 393–401 (2011). https://doi.org/10.1007/s00784-010-0392-z

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  • DOI: https://doi.org/10.1007/s00784-010-0392-z

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