Avaliação clínica e laboratorial de resina composta em função da fotoativação com diferentes fontes de luz e densidades de potência / Clinical and laboratorial evaluation of resin composite light-cured with different curing units and power densities

AUTOR(ES)

Ana Raquel Benetti

DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of this study was to evaluate the clinical and laboratorial performance of a resin composite light-cured with different light-curing units and power densities, at a standard energy density level. Degree of conversion of the resin composite was determined by Fourier transformed infrared spectroscopy. The degree of softening of the resin composite in ethanol was obtained by Wallace hardness measurements before and after storage in a 75% ethanol solution. Wear of the resin composite was acquired by two methods: ACTA wear and toothbrush abrasion. Additionally, the clinical performance of resin composite restorations submitted to the same light-curing protocols was followed up. Class I resin composite restorations were light-cured using either halogen lamp or light emitting diode at 300 mW/cm2 during 40 seconds or 600 mW/cm2 during 20 seconds. Restorations were evaluated immediately and after 6 and 12 months by two calibrated dentists, according to the modified Ryge criteria. The laboratorial data were submitted to two-way analysis of variance and Newman- Keuls multiple comparison test, or t-test. Clinical data were analyzed by Kappa, Fisher and McNemar tests (alpha= 0.05). No significant differences were observed for the different light-curing protocols in the degree of conversion, degree of softening in ethanol, and wear produced by the ACTA method (p >0.05). For the toothbrush abrasion test, irradiation with the light emitting diode unit for 40 seconds at 300 mW/cm2 resulted in higher wear than the other light-curing protocols (p <0.05). No significant differences were detected at the one-year clinical follow-up of the resin composite restorations submitted to the various light-curing protocols investigated in this study (p >0.05).

ASSUNTO(S)

dental restoration wear dureza ftir desgaste de restauração dentária ensaios clínicos light luz clinical trials hardness ftir resinas compostas composite resins

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