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

Autor(es)

Fernanda Regina Voltarelli ^[1] ; Claudia Batitucci dos Santos-Daroz ^[2] ; Marcelo Corrêa Alves ^[3] ; Alessandra Rezende Peris ^[4] ; Giselle Maria March ^[5]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Oral Research; v. 23, n. 4, p. 473-479, 2009-12-00.

Resumo

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)

• Processo FAPESP: 03/12592-8 - Avaliação da influência do tipo de fonte fotoativadora na resistência a microtração e adaptação marginal de restaurações em resina composta assim como a eficiência de polimerização em determinadas profundidades
• Beneficiário: Giselle Maria Marchi
• Modalidade de apoio: Auxílio à Pesquisa - Regular