Evaluation of the effect of the light source on the photo polymerization of two resin material by the Knoop microhardness, compressive strength, flexural strength and material characterization / Avaliação da efetividade da fotoativação de dois materiais resinosos com diferentes fontes de luz, por meio da microdureza Knoop, resistência à compressão, resistência flexural e caracterização dos materiais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The goal of this work was to evaluate the effects of the blue light emitting diodes (LEDs) Smart Lite PS (Dentsply) and the conventional halogen lamp Curing Light XL 3000 (3M) on the polymerization effectiveness of the Dyract Ap compomer (Dentsply) and the TPH Spectrum composite resin (Dentsply) by the Knoop microhardness, compressive strength, flexural strength and material characterization tests. A hundred samples were prepared and divided into 12 groups according to the test applied, the polymerization light and the material. The conventional halogen lamp light had power of 470mW/cm and wavelength between 400 and 510nm; the LED light had power of 950mW/cm and wavelength between 450 and 490nm. The polymerization time for each material 2mm buildup was 40 seconds for the conventional halogen lamp and 10 seconds for LED. For the Knoop microhardness tests the 20 samples were cylinder shaped, 8mm diameter and 2mm height. The hardness was read in the upper and lower side of the samples by a micrometer (Micromet 2003), with 50 gf for 15 seconds. For the compressive strength test the 40 samples were cylinder shaped, 4mm diameter and 8mm height. The strength was measured in an universal testing machine Emic DL 10.000 with 500Kgf and cross-head speed of 0,5 mm/min. For the flexural strength test the 40 samples were box shaped, 25mm length, 2mm width and 2mm height. The strength was measured in an universal testing machine Emic DL 10.000 machine with 50Kgf and cross-head speed of 0,5 mm/min. Each material was characterized by Thermogravimetry, FT-IR analysis, Nuclear Magnetic Resonance, Ash Content Test, X-Ray Fluorescence and Scanning Electron Microscopy. The results were treated by ANOVA and SNK tests (p<0,05). The Knoop microhardness, compressive strength and flexural strength results provided by the halogen light lamp were better than the LED ones. The composite resin performed better than the compomer in all mechanical tests.

ASSUNTO(S)

compômeros polymerization polimerização resinas dentárias light source compomer diodos emissores de luz luz halógena (odontologia) odontologia resistência de materiais (odontologia) resinas compostas fonte de luz composite resin

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