The effect of different photoactivation sources on a nanocomposite resin: LED, halogen and argon laser application - doi: 10.4025/actascitechnol.v35i3.16238

Aline Bassi Denis, Ana Maria de Guzzi Plepis, Rommel Bezerra Viana


This paper evaluates the effects of different light sources on the monomer conversion (DC%) and Vickers microhardness number (VHN) of a nanocomposite resin. Three different depths were measured in this study (1, 2 and 3 mm), and photoactivation methods including a halogen lamp, a LED and an argon ion laser were used. In contrast to other studies, the conditions for each photoactivation source such as the exposure time and the same power density were considered and kept the same. It was also shown that increasing the depth lowered the VHN. At each of the depths, it was observed that the three light sources behaved similarly. The correlation between the VHN and DC% is shown. However, only a weak correlation was observed, which implies that a higher DC% value does not necessarily indicate a higher VHN.



photopolymerization; mechanical properties; infrared spectroscopy; composite resin

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ISSN 1806-2563 (impresso) e ISSN 1807-8664 (on-line) e-mail:


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