Photopolymerization of dental resin as restorative material using an argon laser

• Published in: Lasers in medical science Vol. 23; no. 4; pp. 399 - 406
• Main Authors: Khosroshahi, M. E., Atai, M., Nourbakhsh, M. S.
• Format: Journal Article
• Language: English
• Published: London Springer-Verlag 01.10.2008; Springer Nature B.V
• Subjects: Argon; Clinical outcomes; Dental care; Dental Restoration, Permanent - instrumentation; Dental Restoration, Permanent - methods; Dentistry; Humans; Laser Therapy; Lasers; Lasers, Gas - therapeutic use; Medical technology; Medicine; Medicine & Public Health; Optical Devices; Optics; Original Article; Photonics; Pilot Projects; Polymerization; Polymers - chemistry; Quantum Optics; Resins; Resins, Synthetic - chemistry; Resins, Synthetic - radiation effects; Spectroscopy, Fourier Transform Infrared; Teeth; Terpenes - chemistry; Dental resin; Degree of conversion; Argon laser; Photopolymerization; Camphorquinone
• ISSN: 0268-8921; 1435-604X
• DOI: 10.1007/s10103-007-0487-1

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°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 μg/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 .