Thermal and mechanical properties of microwave- and heat-cured poly(methyl methacrylate) used as dental base material

Usanmaz, Ali
Ates, J
Dogan, A
The thermal and mechanical properties of dental base materials cured by microwave and conventional heat methods were studied. The commercial dental base poly(methvl metacrylate) (PMMA) powder and liquid were mixed in a 3/1 ratio. They were polymerized by a peroxy catalyst at 63degreesC, then cured with a boiling water temperature and microwave radiation for periods of 5, 10, 15, 20, 25, 30, and 35 min for heat curing and 1, 2, 3, 5, and 7 min for microwave radiation. The microwave radiation outputs used were 500 and 700 W. The products of 5-min heat curing and 1-, 2-, and 7-min microwave curing were soluble in chloroform. All the others were partially soluble. The viscosity-average molecular weights of the soluble samples were about 1 x 10(6). The thermal properties of the polymer samples were studied by differential scanning calorimetry


Thermal and dynamic mechanical properties of microwave and heat-cured poly(methyl methacrylate) used as dental base material
Muhtarogullari, IY; Dogan, A; Muhtarogullari, M; Usanmaz, Ali (Wiley, 1999-12-13)
In this study, the particle size distribution, molecular weight, thermal analysis (TGA) differential scanning calorimetry (DSC) and thermogravimetric analysis, and dynamic mechanical analysis (DMA) of poly(methyl methacrylate) used as dental base material were investigated. The commercial raw material used were prepared for microwave curing, and they were cured by microwave and conventional heat methods. The average particle size of the powder studied (103.1 mu m) were much larger than that of the commercia...
Indium tin oxide nanoparticles as anode for light-emitting diodes
Çırpan, Ali (Wiley, 2006-02-15)
Thin films of indium tin oxide (ITO) nanoparticles have been investigated as anode materials for polymer light-emitting diodes. A luminance efficiency (0.13 cd/ A), higher than that (0.09 cd/A) obtained in a control devices fabricated on conventional commercial ITO anodes were found. The thin films were made by spin coating of a suspension followed by annealing. The ITO nartoparticle films have a stable sheet resistance of 200 ohm/sq, and an optical transmittance greater than 86% over the range of 400-1000 ...
Flexible and conducting composites of polypyrrole and polydimethylsiloxane
Cahmak, G; Kucukyavuz, Z; Kucukyavuz, S (Wiley, 2004-07-15)
Conductive and flexible polydimethylsiloxane (PDMS)/polypyrrole (PPy) composites were synthesized electrochemically. Electrochemical syntheses were performed at +1.10 V by using p-toluene sulfonic acid (PTSA) as supporting electrolyte and water as solvent. Composites were characterized by cyclic voltammetry, thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, and Fourier transform infrared spectroscopy. Conductivity measurements and mechanical tests were also perform...
BOUAFFAR, H; Yılmazer, Ülkü; ELBIRLI, B (Wiley, 1994-02-07)
The present study deals with the investigation of the desorption of vinyl chloride from various commercial and experimental suspension PVC resins in a laboratory fluidized bed drier simulating an industrial drier. The results show that PVC resins may differ widely in the rate at which the monomer is desorbed. The rate of diffusion of the monomer is a function of the drying time, the fluidization air temperature, the porosity, and the amount of glassy particles in the PVC. The residual monomer content decrea...
Water Absorption of Two Different Denture Base Resins Reinforced with Dental Fiber Systems
Durkan, Rukiye Kaplan; Oezdemir, Tonguc; Pamir, Ahmet Duru; Usanmaz, Ali (Wiley, 2010-08-05)
The absorption of water by denture base materials is important because it is directly related with dimensional stability of dental material. In this study, water absorption of denture base materials reinforced with different type of dental fiber systems was compared. The samples were prepared from heat-polymerized and microwave polymerized denture base resins and reinforced with different dental fiber systems. Five different reinforcement materials were used in this study, namely, (1) no fiber (control grou...
Citation Formats
A. Usanmaz, J. Ates, and A. Dogan, “Thermal and mechanical properties of microwave- and heat-cured poly(methyl methacrylate) used as dental base material,” JOURNAL OF APPLIED POLYMER SCIENCE, pp. 251–256, 2003, Accessed: 00, 2020. [Online]. Available: