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Micro-hardness evaluation of a micro-hybrid composite resin light cured with halogen light, light-emitting diode and argon ion laser

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Abstract

This in vitro study aimed to determine whether the micro-hardness of a composite resin is modified by the light units or by the thickness of the increment. Composite resin disks were divided into 15 groups (n = 5), according to the factors under study: composite resin thickness (0 mm, 1 mm, 2 mm , 3 mm and 4 mm) and light units. The light activation was performed with halogen light (HL) (40 s, 500 mW/cm2), argon ion laser (AL) (30 s, 600 mW/cm2) or light-emitting diode (LED) (30 s, 400 mW/cm2). Vickers micro-hardness tests were performed after 1 week and were carried out on the top surface (0 mm—control) and at different depths of the samples. Analysis of variance (ANOVA) and Tukey tests (P ≤ 0.05) revealed no statistically significant difference among the light units for the groups of 0 mm and 1 mm thickness. At 2 mm depth, the AL was not statistically different from the HL, but the latter showed higher micro-hardness values than the LED. In groups with 3 mm and 4 mm thickness, the HL also showed higher micro-hardness values than the groups activated by the AL and the LED. Only the HL presented satisfactory polymerization with 3 mm of thickness. With a 4 mm increment no light unit was able to promote satisfactory polymerization.

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Acknowledgments

The authors would like to express their gratitude to Dr. Carlos de Paula Eduardo for his critical comments. They would also like to thank the Special Laboratory of Lasers in Dentistry at the University of São Paulo and to 3MESPE (Brazil) for their contribution. This investigation was also supported by the State of São Paulo Research Foundation/FAPESP, grants 99/08433-4 and 99/11408-1.

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Authors and Affiliations

  1. Departamento de Dentística, Faculdade de Odontologia de São Paulo - USP, Universidade de São Paulo (USP), São Paulo, Brazil

    Katia M. Rode, Patricia M. de Freitas, Patricia R. Lloret & Miriam L. Turbino

  2. School of Medicine, University of Utah, Salt Lake City, UT, USA

    Lynn G. Powell

  3. Departamento de Dentística, Faculdade de Odontologia de São Paulo - USP, Cidade Universitária, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, Brazil, 05508-900

    Miriam L. Turbino

Authors
  1. Katia M. Rode
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  2. Patricia M. de Freitas
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  3. Patricia R. Lloret
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  4. Lynn G. Powell
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  5. Miriam L. Turbino
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Correspondence to Miriam L. Turbino.

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Rode, K.M., de Freitas, P.M., Lloret, P.R. et al. Micro-hardness evaluation of a micro-hybrid composite resin light cured with halogen light, light-emitting diode and argon ion laser. Lasers Med Sci 24, 87–92 (2009). https://doi.org/10.1007/s10103-007-0527-x

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  • DOI: https://doi.org/10.1007/s10103-007-0527-x

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