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The influence of erbium:yttrium–aluminum–garnet laser ablation with variable pulse width on morphology and microleakage of composite restorations

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Abstract

The objective of this study was to evaluate the influence of various pulse widths with different energy parameters of erbium:yttrium–aluminum–garnet (Er:YAG) laser (2.94 μm) on the morphology and microleakage of cavities restored with composite resin. Identically sized class V cavities were prepared on the buccal surfaces of 54 bovine teeth by high-speed drill (n = 6, control, group 1) and prepared by Er:YAG laser (Fidelis 320A, Fotona, Slovenia) with irradiation parameters of 350 mJ/ 4 Hz or 400 mJ/2 Hz and pulse width: group 2, very short pulse (VSP); group 3, short pulse (SP); group 4, long pulse (LP); group 5, very long pulse (VLP). All cavities were filled with composite resin (Z-250-3 M), stored at 37°C in distilled water, polished after 24 h, and thermally stressed (700 cycles/5–55°C). The teeth were impermeabilized, immersed in 50% silver nitrate solution for 8 h, sectioned longitudinally, and exposed to Photoflood light for 10 min to reveal the stain. The leakage was evaluated under stereomicroscope by three different examiners, in a double-blind fashion, and scored (0–3). The results were analyzed by Kruskal–Wallis test (P > 0.05) and showed that there was no significant differences between the groups tested. Under scanning electron microscopy (SEM) the morphology of the cavities prepared by laser showed irregular enamel margins and dentin internal walls, and a more conservative pattern than that of conventional cavities. The different power settings and pulse widths of Er:YAG laser in cavity preparation had no influence on microleakage of composite resin restorations.

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Acknowledgements

The authors wish to thank the Special Laboratory of Lasers in Dentistry (LELO), the International Cooperation Committee (CCInt) of the University of São Paulo, Brazil; Mrs. Lea Sarita Montagna, physicist at Mariner Technological Center (CTM, SP) for support in the SEM analysis, and the Fotona Laser Company, Slovenia, who supplied the laser equipment free of charge.

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Authors and Affiliations

  1. School of Dentistry and Special Laboratory of Lasers in Dentistry (LELO), Universidade Camilo Castelo Branco (UNICASTELO) and University of São Paulo, School of Dentistry (FOUSP), São Paulo, Brazil

    Ricardo Scarparo Navarro

  2. Special Laboratory of Lasers in Dentistry (LELO), University of São Paulo, School of Dentistry (FOUSP), São Paulo, Brazil

    Sheila Gouw-Soares

  3. Department of Restorative Dentistry, Division of Dental Research and Graduate Studies, School of Dentistry, Guarulhos University, Praça Teresa Cristina, 229 Centro, Guarulhos, SP, 07023-070, Brazil

    Alessandra Cassoni

  4. Department of Restorative Dentistry, School of Dentistry, University of São Paulo (FOUSP), São Paulo, Brazil

    Patricia Haypek & Carlos de Paula Eduardo

  5. Center of Lasers and Applications (CLA) of the Institute of Energetic and Nuclear Research (IPEN), São Paulo, Brazil

    Denise Maria Zezell

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  1. Ricardo Scarparo Navarro
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  2. Sheila Gouw-Soares
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  3. Alessandra Cassoni
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Correspondence to Alessandra Cassoni.

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Navarro, R.S., Gouw-Soares, S., Cassoni, A. et al. The influence of erbium:yttrium–aluminum–garnet laser ablation with variable pulse width on morphology and microleakage of composite restorations. Lasers Med Sci 25, 881–889 (2010). https://doi.org/10.1007/s10103-009-0736-6

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  • DOI: https://doi.org/10.1007/s10103-009-0736-6

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