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Type: Artigo de periódico
Title: Effect of different light-curing devices and aging procedures on composite knoop microhardness
Author: Voltarelli, Fernanda Regina
Santos-Daroz, Claudia Batitucci dos
Alves, Marcelo Corrêa
Peris, Alessandra Rezende
March, Giselle Maria
Abstract: The aim of this study was to evaluate the effect of light-curing devices (Halogen/HAL, Light Emitting Diodes/LED, Argon Laser/LAS and Plasma Arc/PAC) and aging procedures (Mechanical Cycling/MC, Thermal Cycling/TC, Storage/S, MC+TC and MC+TC+S) on the micro-hardness of bottom/B and top/T surfaces of 2-mm-high composite resin cylinders. The Knoop microhardness test (25 g, 20 s) on both B and T was performed before and after each aging procedure. For B and T, before aging procedures, PAC showed reduced polymerization effectiveness when compared with HAL. In the T, after TC, PAC and LAS had also showed reduced polymerization effectiveness when compared to HAL and LED. For all light-curing devices, MC+TC+S and S affected the Knoop microhardness values. In the B, no difference could be observed among the aging procedures for PAC. From all light-curing units, PAC may have rendered composites of reduced quality and the storage aging procedures were the most harmful to the polymer hardness.
Subject: Dental materials
Hardness tests
Dental curing lights
Dental stress analysis
Editor: Sociedade Brasileira de Pesquisa Odontológica - SBPqO
Rights: aberto
Identifier DOI: 10.1590/S1806-83242009000400019
Date Issue: 1-Dec-2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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