Photopolymerization of dental resin as restorative material using an argon laser.
The effect of the 488-nm wavelength of argon laser at different power densities and irradiation times on the degree of conversion (DC), temperature rise, water sorption, solubility, flexural strength, flexural modulus, and microhardness of bisphenole A glycol dimethacrylate and triethylen glycol dimethacrylate with a mass ratio of 75:25 was studied. Camphorquinone and N,N'-dimethyl aminoethyl methacrylate were added to the monomer as a photo initiator system. The DC% of the resin was measured using Fourier transform infrared spectroscopy. The maximum DC% (50%), which was reached in 20 s, and temperature rise because of the reaction (13.5 degrees C) were both higher at 1075 than 700 mW/cm(2). Water sorption and solubility were measured according to ISO4049, which in our case were 23.7 and 2.20 microg/mm(3) at 1075 mW/cm(2), respectively. A flexural modulus of 1.1 GPa and microhardness of 19.6 kg/mm(2) were achieved above the power density. No significant difference was observed (i.e., p>0.05) for water sorption and flexural strength at 700 and 1075 mW/cm(2).
Khosroshahi
M E
ME
Faculty of Biomedical Eng, Amirkabir University of Technology, Tehran, Iran. Khosro@aut.ac.ir
Atai
M
M
Nourbakhsh
M S
MS
D001128:Argon; D003793:Dental Restoration, Permanent / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D053685:Laser Therapy; D054020:Lasers, Gas / Q000627:therapeutic use*; D010865:Pilot Projects; D011108:Polymers / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry / Q000528:radiation effects*; D017550:Spectroscopy, Fourier Transform Infrared; D013729:Terpenes / Q000737:chemistry
D011108:Polymers; D012117:Resins, Synthetic; D013729:Terpenes; C048339:camphoroquinone; D001128:Argon