Effects of water storage of E-glass fiber reinforced denture base polymers on residual methyl methacrylate content.
This study investigated the effect of water storage on residual methyl methacrylate (MMA) content of continuous E-glass fiber (Wetrotex International) reinforced denture base polymers. Heat-polymerization (short- and long-term boiling and conventional curing cycle using Meliodent), autopolymerization (processed in air at room temperature and in water at 60 degrees C with the use of Meliodent Rapid Repair), and microwave-polymerization (3 min at 500 W with the use of Acron MC) were employed. The residual MMA contents of 120 specimens were analyzed by high-performance liquid chromatography at deflasking (control) and after water (37 degrees C) storage of 1 day, 1 week, and 1 month. Bonferroni's pairwise comparison test was used for statistical analysis. Significant reduction were determined only in the long-term terminal boiled heat-polymerized test group at the end of 1 day (p < 0.01), 1 week (p < 0.05) and also 1 month of water storage (p < 0.01). Significant reduction in autopolymerized test groups started even after 1 week of water storage (p < 0.05). Microwave-polymerized test groups did not show a significant residual MMA reduction in all time intervals (p > 0.05). The polymerization methods and cycles applied to the glass fiber reinforced denture base polymers influence both the content and the reduction of residual MMA after water storage.
Bayraktar
Gulsen
G
Faculty of Dentistry, Department of Removable Prosthodontics, Istanbul University, Istanbul, Turkey. gulsenbayraktar@hotmail.com
Duran
Ozlem
O
Bural
Canan
C
Guvener
Bora
B
D000180:Acrylic Resins / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D003764:Dental Materials / Q000737:chemistry; D003819:Denture Bases; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D014867:Water
D000180:Acrylic Resins; D001672:Biocompatible Materials; D003764:Dental Materials; D008768:Methylmethacrylates; D011108:Polymers; D014867:Water; C091555:Meliodent; C075051:Acron MC