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01-11-2010 | Original Article

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

Authors: Ricardo Scarparo Navarro, Sheila Gouw-Soares, Alessandra Cassoni, Patricia Haypek, Denise Maria Zezell, Carlos de Paula Eduardo

Published in: Lasers in Medical Science | Issue 6/2010

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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Title: The influence of erbium:yttrium–aluminum–garnet laser ablation with variable pulse width on morphology and microleakage of composite restorations
Authors: Ricardo Scarparo Navarro
Sheila Gouw-Soares
Alessandra Cassoni
Patricia Haypek
Denise Maria Zezell
Carlos de Paula Eduardo
Publication date: 01-11-2010
Publisher: Springer-Verlag
Published in: Lasers in Medical Science / Issue 6/2010
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI: https://doi.org/10.1007/s10103-009-0736-6

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

Abstract

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Abstract

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