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Proceedings Paper

Aged composite resins ablation under different parameters of Er:YAG laser: ablation rate and morphological aspects
Author(s): Rosane de Fátima Zanirato Lizarelli D.D.S.; Lilian Tan Moriyama M.D.; Fernando L. E. Florez D.D.S.; Denis P. Jacomassi M.D.; José Eduardo P. Pelino D.D.S.; Vanderlei S. Bagnato D.D.S.
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Paper Abstract

This work presents a study to understand the interaction between Er:YAG laser and composite resin. The main purpose is the development of a new ultra-conservative clinical technique: differential ablation for composite resin restorations using Er:YAG laser. A hybrid composite resin (Z100, 3M, USA) formatted as tablets recently cured was used and after artificial aging method the teeth were irradiated with a Er:YAG laser and two different conditions were considered, energy level per pulse (100, 300 and 500mJ), frequencies (5, 10 and 15Hz) and different water fluxes. Diameter and depth of each resulted microcavity was measured and the material removed volumes were calculated. The resulted values were plotted and feted to allow a comparative observation of the material removed as a function of energy level per pulse. Frequencies of 5 and 10Hz were similar between them and seemed to allow the highest material ablated volume, however considering the energy per pulse parameter, 300mJ was more efficient than the others, mainly when water flux was around 0.1ml/s. The highest water flux showed lower ablation rate with the lowest fluency. Water fluxes presented an important factor considering composite ablation, even because it could modulate depth and surface regularity of the irradiated material.

Paper Details

Date Published: 8 March 2007
PDF: 10 pages
Proc. SPIE 6425, Lasers in Dentistry XIII, 64250C (8 March 2007);
Show Author Affiliations
Rosane de Fátima Zanirato Lizarelli D.D.S., Univ. de São Paulo (Brazil)
Lilian Tan Moriyama M.D., Univ. de São Paulo (Brazil)
Fernando L. E. Florez D.D.S., Univ. de São Paulo (Brazil)
Denis P. Jacomassi M.D., Univ. de São Paulo (Brazil)
José Eduardo P. Pelino D.D.S., Univ. de São Paulo (Brazil)
Vanderlei S. Bagnato D.D.S., Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 6425:
Lasers in Dentistry XIII
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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