[Residual monomer content determination in some acrylic denture base materials and possibilities of its reduction].
OBJECTIVE
Polymethyl methacrylate is used for producing a denture basis. It is a material made by the polymerization process of methyl methacrylate. Despite of the polymerization type, there is a certain amount of free methyl methacrylate (residual monomer) incorporated in the denture, which can cause irritation of the oral mucosa. The aim of this study was to determine the amount of residual monomer in four different denture base acrylic resins by liquid chromatography and the possibility of its reduction.


METHODS
After the polymerization, a postpolymerization treatment was performed in three different ways: in boiling water for thirty minutes, with 500 W microwaves for three minutes and in steam bath at 22 degrees C for one to thirty days.


RESULTS
The obtained results showed that the amount of residual monomer is significantly higher in cold polymerizing acrylates (9.1-11%). The amount of residual monomer after hot polymerization was in the tolerance range (0.59-0.86%).


CONCLUSIONS
The obtained results denote a low content of residual monomer in the samples which have undergone postpolymerization treatment. A lower percent of residual monomer is established in samples undergone a hot polymerization.
Kostić
Milena
M
Klinika za stomatologiju, Odeljenje za stomatolosku protetiku, Nis, Srbija. kosticmilena@sbb.rs
Krunić
Nebojsa
N
Nikolić
Ljubisa
L
Nikolić
Vesna
V
Najman
Stevo
S
Kocić
Jelena
J