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Proceedings Paper

Dental composite polymerization: a three different sources comparison
Author(s): Michele Sozzi; Carlo Fornaini M.D.; Giuseppe Lagori; Elisabetta Merigo; Annamaria Cucinotta; Paolo Vescovi; Stefano Selleri
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Paper Abstract

The introduction of photo-activators, with absorption spectra in the violet region, in composite resins raised interest in the use of 405 nm diode lasers for polymerization. The purpose of this research is the evaluation of the resins polymerization by means of violet diode laser compared to traditional lamps. Two different resins have been used for the experiments: Filtek Supreme XT flow (3M ESPE, USA) and Tetric Evo flow (Ivoclar, Vivadent). The photo-activator used is Camphoroquinone, alone, or in combination with Lucirin TPO. The resins have been cured with an halogen lamp (Heliolux DXL, Vivadent Ivoclar, Austria), a broadband LED curing light (Valo Ultradent, USA) and a 405 nm laser (Euphoton, Italy). The measure of cure depth, of the volumetric shrinkage, and the conversion degree (DC%) of the double bond during the curing process have been evaluated. A composite layer of 3 mm was cured in Filtek Supreme resin (Camphoroquinone activator), lower if compared to the use of the other two light sources. Tests on Tetric Evo (Camphoroquinone + Lucirin) didn’t show any improvement of the use of laser compared to the halogen lamp and the broadband LED. By measuring the volumetric shrinkage the laser induced the lower change with both the composites. In terms of DC% the lower performance was obtained with the laser. Considering that the polymerization process strongly depends on the kind of composite used the effectiveness of 405 nm laser proved to be lower than halogen lamps and broadband LEDs.

Paper Details

Date Published: 24 February 2015
PDF: 5 pages
Proc. SPIE 9306, Lasers in Dentistry XXI, 930608 (24 February 2015); doi: 10.1117/12.2079227
Show Author Affiliations
Michele Sozzi, Univ. degli Studi di Parma (Italy)
Carlo Fornaini M.D., Univ. degli Studi di Parma (Italy)
Giuseppe Lagori, Univ. degli Studi di Parma (Italy)
Elisabetta Merigo, Univ. degli Studi di Parma (Italy)
Annamaria Cucinotta, Univ. degli Studi di Parma (Italy)
Paolo Vescovi, Univ. degli Studi di Parma (Italy)
Stefano Selleri, Univ. degli Studi di Parma (Italy)

Published in SPIE Proceedings Vol. 9306:
Lasers in Dentistry XXI
Peter Rechmann; Daniel Fried, Editor(s)

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