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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of different light-curing devices and aging procedures on composite knoop microhardness

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Author(s):
Fernanda Regina Voltarelli [1] ; Claudia Batitucci dos Santos-Daroz [2] ; Marcelo Corrêa Alves [3] ; Alessandra Rezende Peris [4] ; Giselle Maria March [5]
Total Authors: 5
Affiliation:
[1] University of Campinas (UNICAMP). Piracicaba Dental School - Brasil
[2] University of Campinas (UNICAMP). Piracicaba Dental School - Brasil
[3] University of Campinas (UNICAMP). Piracicaba Dental School - Brasil
[4] State University of Amazonas - Brasil
[5] University of Campinas (UNICAMP). Piracicaba Dental School - Brasil
Total Affiliations: 5
Document type: Journal article
Source: Brazilian Oral Research; v. 23, n. 4, p. 473-479, 2009-12-00.
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. (AU)