Abstract
AIMS: to evaluate the effect of microwave post-treatment in the reduction of residual monomer of different types of acrylic resin and evaluate the effect of microwave treatment time. MAERIALS AND MEHODS: three different types of acrylic resin materials are used; heat cured, light cured, and or- thocryl. Specimens are subjected to additional curing with microwave and compared their residual monomer with the control group. ANOVA followed by Duncan multiple range test were used to de- termine the significant difference at P<0.05 level. RESULS: there was a significant difference (p<0.0001) in the amount of residual monomer released from the three tested materials. No statistical difference were seen between 5 and 10 minute microwave treatment for the heat cured and orthocryl acrylic resin but there is significant difference between 5 and 10 minute treatment for the light cured acrylic resin. CONCLUSIONS: There are different levels of residual monomer when comparing the tested materials with each other. Additional treatment with microwave after curing decrease the residu- al monomer of all the tested acrylic resin materials.
Highlights
Residual monomer release from acrylic resin relates to the degree of material polymerization and influences several physical and mechanical polymer properties.[1]
The number of specimens were 60 specimens, and three different types of acrylic resin materials are used; one third of the specimens were post-cured in a microwave oven(Panasonic, Japan) for 5 minute at 800 watt, the second third of the specimens were post-cured in microwave oven for 10 minute at 800 watt, and the last third of the specimens were left without treatment
All specimens were immersed in fresh distilled water(each specimen in a separated container with 20ml fresh distilled water) and all containers left at room temperature for 24 hours.[9]. Residual monomers were measured using a digital spectrophotometer (CECIL, CE 1021, England) at 254nm, It is a photometric device used to measure the optical density with accuracy up to 0.001.(1) Mean values were compared with ANOVA followed by Duncan multiple range test to determine the significant difference at P < 0.05 level of significance
Summary
Residual monomer release from acrylic resin relates to the degree of material polymerization and influences several physical and mechanical polymer properties.[1] Residual monomer, resulting from incomplete conversion of monomers into polymer, has the potential to cause irritation, inflammation, and an allergic response of the oral mucosa. Light-cured acrylic resins were introduced in the early 1980s. These resins have been reported to be nontoxic after polymerization, several studies have shown that light-cured acrylic resins have varying levels of cytotoxicity. The extent of their toxic effect appears to be related to the specific formulation of the material and polymerization time.
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