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Thermal and spectral behaviour of a light-cured methacrylate-based composite material used in dentistry |
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| Authors: | H O Manolea P Rotaru G Manolea E Morîntale R Rîcă |
| Institution: | 1. Department of Dental Materials, Faculty of Dentistry, University of Medicine and Pharmacy Craiova, 2-4 Petru Rare? Street, 200349, Craiova, Romania 2. Department of Physics, Faculty of Exact Sciences, University of Craiova, 13 AI Cuza Street, 200585, Craiova, Romania 3. Department of Electromechanics, Faculty of Electrical Engineering, University of Craiova, 107 Decebal Boulevard, 200440, Craiova, Romania |
| Abstract: | The evolution of the polymerization of a light-cured methacrylate-based composite material (Pekalite) used in dentistry was studied. Fourier transform infrared spectroscopy and thermal analysis (TA) showed that with increasing the photo-polymerization time from 5 to 60 s, the degree of conversion increases from 32.5 to 59.6 % and thermal stability of the composite material increases from 144.6 to 270 °C. Growth of photo-polymerization time from 5 to 60 s produces an improvement in the mechanical strength of the composite material from 153 to 248 MPa. Spectral analysis and TA are two complementary and rapid methods for determining the degree of polymerization of composite materials used in dentistry. |
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