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Quintessence Publishing: Journals: JOLA


The Journal of Oral Laser Applications

Edited by Prof Dr Andreas Moritz and Prof G. Lynn Powell

Official publication of the European Society for Oral Laser Applications

ISSN (print) 1473-7809 • ISSN (online) 1867-5611

Winter 2006
Volume 6 , Issue 4

Pages: 277-283
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The Use of Laser-ablation Rate to Evaluate the Quality of Cure in Light-polymerized Composite Resins

Lizarelli, Rosane de Fátima Zanirato / Moriyama, Lílian Tan / Pelino, José Eduardo Pelizon / Bagnato, Vanderlei Salvador

Purpose: To compare two blue LED (light emitting diode) sources in terms of curing efficacy as determined by the ablation resistance of light-cured composite resins when irradiated with an Er:YAG laser. Materials and Methods: A hybrid composite resin was photocured with two blue LED light sources at 105 mW/cm2 and 1000 mW/cm2. Composite tablets were photocured for two different irradiation times: 5 s and 40 s. A focused Er:YAG laser at five energy levels per pulse (100 to 500 mJ), a fixed frequency of 10 Hz, and water flow of 0.46 ml/s, was used for 10 s to ablate the cured composite resin. Results: The obtained values were plotted to allow a comparative observation of the removed material volume as a function of fluence. The higher the energy per pulse, the higher the ablation rate; however, above 300 mJ, the photocuring time and LED intensity were important factors influencing curing efficacy. Conclusions: The lowest intensity parameter allowed the largest ablation rate on material photocured for 5 s, while the highest intensity produced the same result on material photocured for 40 s.

Keywords: photocuring, composite resins, LED, laser, Er:YAG, ablation rate

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