Influence of shade on light trannmission and mechanics propriety of resin composite / Influencia da cor na passagem de luz e relação com propriedades mecanicas de compositos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

For many types and shades of resin, a high degree of cure is not achieved through a 2 mm thickness photo-activated resin composite. The study was divided into two Chapters in order to make the objectives clearer. Chapter 1: The aim was to investigate the influence of different composite resin shades on light transmission through the composite and the difference in percentage of decrease of Knoop hardness between bottom and top (PHD). Two restorative resin composites of shades A1 and A3.5 were used (Esthet X and Filtek Z350). Light curing unit (LCU) irradiance was measured with a power meter Ophir Optrônicos (780 mw/cm2). Twenty specimens were made for each color. Light transmission test: The irradiance of light that passed through the composite was measured. Knoop Hardness test: the PHD of the same specimen was calculated (n=10). Irradiance of light that passed through composite shade A1 was statistically higher than though shade A3.5 for both composite (p=0.00001). For Esthet X the PHD of shade A3.5 was statistically higher than that of shade A1 but for Filtek Z350 there was no difference (p=0.03035). Different composite resins influenced the light transmission and the PHD. Darker shades influenced the light transmission, but they are not necessarily correlated with the PHD. Chapter 2: The aim was to investigate the influence of different composite resin shades on light transmission through the composite, hardness and cross-link density (CLD). The composite Filtek Z250 was used in shades A1, A3 and A3.5. Light curing unit irradiance was measured with a power meter Ophir Optronics (900 mw/cm2). Thirty specimens were made for each shade. Light transmission test: Irradiance of light that passed through the composite was calculated (n=10). The difference in percentage of decrease of Knoop hardness between bottom and top (PHD) of the same specimen was calculated (n=10). The cross-link density was calculated by the softening effect produced by ethanol, by the decrease in hardness (n=10). Irradiance of light that passes through the composite shade A1 was statistically greater than though shade A3 that was also greater than though the shade A3.5. The PHD of shade A3.5 was statistically higher than that of shade A3, which that was also greater than that of shade A1. There was no statistically significant difference in CLD. Darker shades have a significant influence on light transmission through the dental resin composite and its hardness. However, the cross-link density was not affected by darker dental composite shades

ASSUNTO(S)

composite resins resinas compostas dureza hardness

ACESSO AO ARTIGO

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