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Investigation of the Effect of Variation of Cross- Linking Agents and two Heating Rates on Glass Transition of a Denture Base Acrylic Resin

Vjekoslav Jerolimov ; 1 Zavod za mobilnu protetiku, Stomatološkog fakulteta Sveučilišta u Zagrebu i Klinički zavod za stomatološku protetiku, Kliničke bolnice “Dubrava”, Zagreb, Hrvatska
Robert G. Jagger ; Department of Restorative Dentistry School of Dentistry, University of Wales College of Medicine, Cardiff, Wales, Velika Britanija
Paul J. Millward ; Department of Restorative Dentistry School of Dentistry, University of Wales College of Medicine, Cardiff, Wales, Velika Britanija
Vlado Carek ; 1 Zavod za mobilnu protetiku, Stomatološkog fakulteta Sveučilišta u Zagrebu i Klinički zavod za stomatološku protetiku, Kliničke bolnice “Dubrava”, Zagreb, Hrvatska


Puni tekst: hrvatski pdf 8.330 Kb

str. 19-24

preuzimanja: 356

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Sažetak

The purpose of the study was to investigate the effect of two different
heating rates used in order to evaluate the transition glass temperature of dough-moulded poly (methylmethacrylate) denture base materials. Cross-linking agents ethylene glicol dimethacrylate (EGDMA), tetra (ethylene glycol dimetacry late) (TEGDMA) and poly (ethylene glycol dimethacrylate) (PEG 600 DMA) were added to the MM A monomer component in concentrations o f 0 - 30% according to the volume o f monomer liquid concentration. The polymer component was an unpigmented PMMA homopolymer. The comparison group of specimens was made by using the monomer liquid without a cross-linking agent. Specimens were produced in moulds according to conventional dental- flasking and curing procedures. Measurements o f Tg were determined by thermomechanical analysis using a Stanton Redcroft TMA, Model 790 (PL Thermal Sciences Ltd., Epsom, UK) Heating rates o f 5 °C/min and 10 °C/min were selected for this investigation. It was concluded that Tg values were highly dependent o f the heating rates used in thermomechanical analysis, being very significantly increased with the increase in heating rate. It was also concluded that the addition of a cross-linking agent would affect Tg o f denture base resins.

Ključne riječi

poly(methyl methacrylate), glass transition, heating rate, cross-linking

Hrčak ID:

99348

URI

https://hrcak.srce.hr/99348

Podaci na drugim jezicima: hrvatski

Posjeta: 669 *