Results: HPLC showed statistically significant differences among two groups (P < 0.05) in the amount of eluted monomer There were significant differences at one hour (T 1) (p = 0.001), at two hours (T2) (p = 0.011) and insignificant difference (p = 0.606) was observed at the six hours (T3 ) interval in the residual monomer
release in two groups.
The glass transition temperature [T.sub.g] of Simgal as an auto polymerized denture base polymer was considerably lowered because of the residual MMA content -85[degrees]C [56, 57], Among the properties that could be affected by the presence of residual monomers
in the acrylic resin is its [T.sub.g], due to the plasticizing effect of the MMA.
The ADI/HDI hybrid isocyanurate with low residual monomer
content was synthesized successfully with TMR as catalyst.
reported that monomer release was higher in LED devices than in halogen devices in their study in which they investigated the effects of five different light devices on residual monomer
release from composite materials with an HPLC device .
[6.] Axelsson B, Nyquist G (1962) The leaching and biological effect of residual monomer
of methyl methacrylate.
Release of methyl methacrylate from heat cured and antopolymerized resins:cytoxicity:Testing related to residual monomer
.Aust Dent J: 44(1): 25-30.
Depending upon the type of polymerization, PMMA resins may leach 0.1-5% of the residual monomer
and additives, mainly MMA and formaldehyde, contributing to localized allergic reactions.
They also affirm that there is a reduction in the amount of residual monomers
after 6 h, and that, after that period, the heat treatment did not lead to an increase in flexural strength.
This polymer is transferred by screw directly into the twin-shaft "finishing" vessel, where residual monomer
is removed and fillers and additives may be added.
Polymer compositions were calculated based on the residual monomer
determined using gas chromatography.
The third generation ACOMP products is an automated smart manufacturing system that continuously analyzes polymers during production and produces realtime insights into reaction kinetics and polymer properties, including residual monomer
, monomer conversion, polymer composition, molecular weight and intrinsic viscosity.
This has been shown to decrease the residual monomer
content in the cured dentures and a consequent decrease in the porosity in the denture base19 thus, decreasing the occurrence of breaches at teeth-denture base interface.