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Influence of laser irradiation on fiber post retention

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Abstract

The purpose of this in vitro study was to compare the bond strength between fiber post and laser-treated root canals. Forty single-rooted bovine teeth were endodontically treated and randomly divided into four groups of equal size according to the root canal treatment: group 1 conventional treatment (without laser irradiation); group 2 Nd:YAG laser (1.5 W, 10 Hz, 100 mJ); group 3 Er,Cr:YSGG laser (0.75 W, 20 Hz); and group 4 Nd:YAG + Er,Cr:YSGG lasers. The fiber posts were cemented with an adhesive system + resin cement, in accordance with the manufacturer’s instructions. A mini acrylic pipe was fixed on the coronal section of the post using a light-polymerized resin. Specimens were mounted on an acrylic pipe with a self-polymerized resin. Retention forces were determined using a universal testing machine (0.5 mm/min). Data were analyzed using one-way ANOVA and Tukey tests (p <0.05). The post retention force in group 2 was found to be lower than that in the other experimental groups. Fractures were observed at the interface between the dentin and the resin in all groups. High-intensity lasers can be used in conventional endodontic treatment; however, root canal surface irradiation using the Nd:YAG laser was shown to negatively affect the post retention force.

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Aknowledgments

The authors would like to thank 3M/ESPE (Brazil) and Angelus (Brazil) for providing the materials used in the present study. They also express their gratitude to the Special Laboratory of Lasers in Dentistry (LELO) of the University of São Paulo for the use of the Er,Cr:YSGG laser purchased with the financial support of FAPESP (project CEPID/CEPOF, grant 98/14270-8, and grant 04/12314-0).

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Authors and Affiliations

  1. Department of Restorative Dentistry, University of São Paulo, São Paulo, SP, Brazil

    Denis Y. Nagase, Susana Morimoto, Margareth Oda & Glauco F. Vieira

  2. Special Laboratory of Lasers in Dentistry, Department of Restorative Dentistry, University of São Paulo, São Paulo, SP, Brazil

    Patricia M. de Freitas

  3. Departamento de Dentistica, Faculdade de Odontologia – USP, Av. Prof. Lineu Prestes 2227, Sao Paulo, SP, Brazil, 05508-000

    Denis Y. Nagase

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  1. Denis Y. Nagase
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  2. Patricia M. de Freitas
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  3. Susana Morimoto
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  4. Margareth Oda
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  5. Glauco F. Vieira
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Correspondence to Denis Y. Nagase.

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Nagase, D.Y., de Freitas, P.M., Morimoto, S. et al. Influence of laser irradiation on fiber post retention. Lasers Med Sci 26, 377–380 (2011). https://doi.org/10.1007/s10103-010-0861-2

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  • DOI: https://doi.org/10.1007/s10103-010-0861-2

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