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Argon ion laser and halogen lamp activation of a dark and light resin composite: microhardness after long-term storage

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Abstract

The objective of this study was to evaluate in vitro light activation of the nano-filled resin composite Vita shade A1 and A3 with a halogen lamp (QTH) and argon ion laser by Knoop microhardness profile. Materials and methods: Specimens of nanofilled composite resin (Z350-3 M-ESPE) Vita shade A1 and A3 were prepared with a single increment inserted in 2.0-mm-thick and 3-mm diameter disc-shaped Teflon mold. The light activation was performed with QTH for 20 s (with an intensity of approximately 1,000 mW/cm2 and 700 mW/cm2) and argon ion laser for 10 s (with a power of 150 mW and 200 mW). Knoop microhardness test was performed after 24 h and 6 months. The specimens were divided into the 16 experimental groups (n = 10), according to the factors under study: photoactivation form, resin shade, and storage time. Knoop microhardness data was analyzed by a factorial ANOVA and Tukey´s tests at the 0.05 level of significance. Results: Argon ion laser was not able to photo-activate the darker shade of the nanofilled resin composite evaluated but when used with 200 mW it can be as effective as QTH to photo-activate the lighter shade with only 50% of the time exposure. After 6 months storage, an increase in the means of Knoop microhardness values were observed. Conclusions: Light-activation significantly influenced the Knoop microhardness values for the darker nanofilled resin composite.

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Acknowledgements

The authors would like to thank the Special Laboratory of Lasers in Dentistry (LELO) of the University of São Paulo (Brazil) for the use of the argon ion Laser, Dr. Anderson Zanardi de Freitas (and staff) from Laser and Application Center, Energy and Nuclear Research Institute, São Paulo (Brazil) for their assistance and express their gratitude to CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for financial support for this research and to 3M ESPE for material support.

Disclosure

The authors have no interest in any of the companies or products mentioned in this article.

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Authors and Affiliations

  1. Department of Restorative Dentistry, School of Dentistry, Guarulhos University, São Paulo, Brazil

    Alessandra Cassoni, Juliana de Oliveira Ferla, Luis Gustavo Barrotte Albino & José Augusto Rodrigues

  2. Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil

    Michel Nicolau Youssef

  3. Department of Restorative Dentistry, School of Dentistry, University Cruzeiro do Sul, São Paulo, Brazil

    Michel Nicolau Youssef

  4. Department of Periodontology, School of Dentistry, Guarulhos University, São Paulo, Brazil

    Jamil Awad Shibli

  5. Universidade Guarulhos, Pós-Graduação em Odontologia, R. Nilo Peçanha, 81, Prédio U- 6º andar - Centro, Guarulhos, SP, Brazil, CEP 07011-040

    Alessandra Cassoni

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  1. Alessandra Cassoni
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  2. Juliana de Oliveira Ferla
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  3. Luis Gustavo Barrotte Albino
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  4. Michel Nicolau Youssef
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  6. José Augusto Rodrigues
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Correspondence to Alessandra Cassoni.

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Cassoni, A., Ferla, J.d.O., Albino, L.G.B. et al. Argon ion laser and halogen lamp activation of a dark and light resin composite: microhardness after long-term storage. Lasers Med Sci 25, 829–834 (2010). https://doi.org/10.1007/s10103-009-0708-x

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  • DOI: https://doi.org/10.1007/s10103-009-0708-x

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