Effect of glass fibre reinforcement on residual methyl methacrylate content of denture base polymers.
OBJECTIVE
Residual methyl methacrylate (MMA) content in unreinforced and in glass fibre reinforced, heat-polymerized (long- and short-term terminal boiled and conventionally) autopolymerized (at room temperature and in water at 60 degrees C) and microwave-polymerized (3min at 500W) denture base polymers after processing were compared.


METHODS
Ten specimens were prepared for each curing cycle (five unreinforced and five reinforced) adding up to a total of 60. Residual MMA content was determined using high-performance liquid chromatography. Data were analysed with one-way ANOVA followed by Tukey HSD and Paired Samples tests.


RESULTS
For unreinforced and reinforced groups; residual MMA content succesively ranked from lowest to highest in; long- and short-term terminal boiled heat-polymerized, microwave-polymerized, autopolymerized specimens processed in water at 60 degrees C and conventionally heat- and autopolymerized specimens processed at room temperature. Generally residual MMA was found more in glass fibre reinforced test groups than unreinforced groups. However, when reinforced residual MMA increased significantly in long- and short-term terminal boiled heat- (P<0.05) and microwave-polymerized test groups (P<0.01).


CONCLUSIONS
Although this increase was significant, lowest residual MMA content was found succesively in reinforced long- and short-term terminal boiled heat-polymerized and microwave-polymerized like in unreinforced groups.
Department of Removable Prosthodontics, Faculty of Dentistry, Istanbul University, 34390, Capa-Istanbul, Turkey. gulsenbayraktar@hotmail.com
Gulsen
G
Bayraktar
Ozlem
O
Duran
Bora
B
Guvener
D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D002851:Chromatography, High Pressure Liquid; D003764:Dental Materials / Q000737:chemistry*; D003819:Denture Bases; D005898:Glass / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D016555:Matched-Pair Analysis; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D020366:Methylmethacrylate / Q000737:chemistry*; D008872:Microwaves; D011108:Polymers / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D014867:Water
D000180:Acrylic Resins; D003764:Dental Materials; D008689:Methacrylates; D011108:Polymers; C009753:fiberglass; D014867:Water; D020366:Methylmethacrylate; D019904:Polymethyl Methacrylate