title: Influence of polymerization method, curing process, and length of time of storage in water on the residual methyl methacrylate content in dental acrylic resins.
abstract: This study compared the influence of different polymerization methods (heat, auto-, and microwave energy), different curing processes (in the case of heat- and autopolymerized specimens), and length of storage of the polymerized specimens in distilled water at 37 degrees C on the residual methyl methacrylate (MMA) content in dental acrylic resin specimens. Residual MMA of 120 resin specimens were measured using high-performance liquid chromatography. For the heat-polymerized resins, the lowest residual MMA content was obtained when they were given a long-term terminal boil and then stored in the distilled water for at least 1 day. For the autopolymerized resins, the lowest residual MMA content was obtained when they were additionally cured in water at 60 degrees C and then stored in the distilled water at least 1 day. For the microwave-polymerized resins, the lowest residual MMA content was obtained when they were stored in the distilled water at least 1 month. The lowest overall residual MMA content was obtained from heat-polymerized specimens that were given a long-term terminal boil cure and then stored in the distilled water at least 1 day. Different polymerization methods and curing processes have different effects on residual MMA content. It is thus shown that storing a dental acrylic resin specimen in distilled water at 37 degrees C is a simple but effective method of reducing its residual MMA content.
authors.affiliation: Istanbul University, Faculty of Dentistry, Department of Removable Prosthodontics, Istanbul, Turkey. gulsenbayraktar@yahoo.com
authors.forename: Gulsen
authors.initials: G
authors.lastname: Bayraktar
authors.forename: Bora
authors.initials: B
authors.lastname: Guvener
authors.forename: Canan
authors.initials: C
authors.lastname: Bural
authors.forename: Yagiz
authors.initials: Y
authors.lastname: Uresin
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D003764:Dental Materials / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D020366:Methylmethacrylate / Q000737:chemistry*; D008872:Microwaves; D014867:Water
chemical_list: D000180:Acrylic Resins; D001672:Biocompatible Materials; D003764:Dental Materials; D014867:Water; D020366:Methylmethacrylate