PENGARUH PENAMBAHAN FIBER (E-glass) PADA RESIN KOMPOSIT TERHADAP KONSENTRASI SISA MONOMER

Abstract

Fiber Reinforced Composite is a composite material which is created by fusing composite resin and fiber. There is great interest in the development of FRC in dentistry because of its mechanical properties, which supports the concept of minimally invasive dentistry. E-Glass fiber is a type of fiber which is commonly used because of its high transluncency. Resin-based composite is set through the polymerization of the monomer matrix. The degree of polymerization of resin-based composite will never reach 100%, thus resulting in residual monomer. The amount of residual monomer affects the mechanical properties and bicompatibility of a material. This study was conducted to investigate the effects of fiber addition to residual monomer concentration in fiber reinforced composite. E-glass fiber (R338-2400/V/P, Stick Tech Ltd., Turku, Finland) and composite resin Masterflow ® (Biodinamica, Brazil) were used. There were two groups. Group one was composite resin and group two was composite resin with the addition of E-glass fiber. Each material was inserted into the mold (size 2x2x25mm), then cured by visible light cure for 20 seconds, then powdered. 150 mg of the sample powder was diluted in acetonitrile to reach a volume of 10 ml for each group. Magnetic stirrer was used to dissolve the solution for 72 hours. The sample solution was filtered with a syringe filter 0.2 μl and then injected into the HPLC as much as 20 μl. Residual Monomer was analyzed using the mobile phase of acetonitrile and water with a 7: 3 ratio, flow rate of 1 ml/minute at room temperature. The size of column was C18 5μ, length 125 mm, and 4 mm in diameter. UV detection using 275 nm wavelength was performed. The data were analyzed by t-test. The average concentration of residual monomer of the composite resin was 0,0336 + 0,0014 and the E-glass FRC was 0,0017 + 0,0201. Test t-test result showed a significant difference between the two treatment groups (p<0.05). It could be concluded that the addition of E-glass fiber to composite resin reduced the concentration of residual monomer