PENGARUH LAMA PERENDAMAN DALAM AIR TERHADAP KONSENTRASI PELEPASAN MONOMER PADA FIBER REINFORCED COMPOSITE JENIS ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE (UHMWPE)

Fiber reinforced composite is a combination material of resin composite as matrix, fiber as reinforcement and coupling agent as a binder. Matrix in FRC contains bis-GMA which has water absorbing property. Water sorption will cause residual monomer released. The aim of this study was to determine the influence of water soaking duration to monomer release from FRC with ultra high molecular weight polyethylene (UHMWPE) fiber. Samples of this research were FRC with UHMWPE fiber (CONSTRUCT Kerr TM, USA). Bar shaped samples with a size of 5�2�2 mm, cured with ligh curing unit for 20s. Samples were divided into three groups and soaked in distilled water for 1, 7, and 21 days (n = 4). Samples were soaked in distilled water with temperature 37oC. The monomer release was measured with high performance liquid chromathography (HPLC) (Shimadzu Class VP, Kyoto, Japan). The equipment with a UV detaktor 220 nm, mobile phase of CH3CN / H2O (7 : 3), and 20 μL injection. The data of monomer release concentration were tested using one way ANOVA and LSD test. The results showed mean quantity monomer release of the soaking group between day 1, 7, and 21 were 439.839 ± 0.931 μg/mL, 443.017 ± 0.117 μg/mL, and 444.086 ± 0.192 μg/mL. ANOVA result showed that there was significant influence of water soaking duration to monomers release (p � 0.05). LSD showed significant differences between 1 day to 21 day. Conclusion of this research was water soaking duration has influence on the quantity monomer release from FRC with UHMWPE. Key words : FRC, UHMWPE, water soaking, quantity monomer releas