Original scientific paper
Investigation of Residual Monomer in Microwave and Heat-polymerized Acrylates by a Procedure of Infrared Spectrophotometry
Ivan Alajbeg
; Dom zdravlja “INA”, Zagreb, Hrvatska
Vlado Carek
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Vjekoslav Jerolimov
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Vjera Urlić
; INA - Polimeri, Zagreb, Hrvatska
Ivo Baučić
; School of Dental Medicine, University of Zagreb, Zagreb, Croatia
Abstract
The aim of the investigation was to determine the amount of residual
monomer (RM) in polymethylmethacrylate specimens. RM is a potential allergic and toxic agent, which weakens the mechanical properties of acrylic dentures. The specimens were prepared by different procedures, with regard to temperature, pressure and polymerization duration. One specimen was obtained by microwave procedure. In thisstudy the position o f microwave polymerized acrylate was determined in relation to heat curing method o f polymerization. All samples were prepared by extraction with methanol and dissolution with chloroform. RM was measured by infrared spectrophotometry. The results showed that the amount o f RM released by dissolution was several times greater than the amount released by extraction of the same specimen. Furthermore, it was demonstrated that heat-polymerized specimens showed the lowest values for RM, followed by the microwave-polymerized specimens, while the cold-polymerized specimens showed the greatest amount of RM.
Keywords
acrylates; residual monomer; types of polymerization; infrared spectrophotometry
Hrčak ID:
99395
URI
Publication date:
15.9.1997.
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