Effect of light intensity on polymerization of light-cured composite resins.
The depths of cure and the distributions of degree of conversion (DC), polymerization conversion (PC) and percent pendant double bonds (PDB) of light-cured composite resins cured under various intensities of light were investigated. When the total amount of exposure, represented by the product of the light intensity and the irradiation time, was kept constant, each of the depth of cure and the distributions of DC, PC and PDB were the same for each material regardless of the light intensity and irradiation time. The depth of cure could be expressed as a logarithmic function of the total amount of exposure. From regression analysis, the attenuation coefficient and the critical total amount of exposure capable of initiating polymerization of each composite resin could be determined.
Nomoto
R
R
Department of Dental Engineering, Tsurumi University School of Dental Medicine, Japan.
Uchida
K
K
Hirasawa
T
T
D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry / Q000528:radiation effects; D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D007700:Kinetics; D008027:Light; D015394:Molecular Structure; D011092:Polyethylene Glycols / Q000737:chemistry / Q000528:radiation effects; D011109:Polymethacrylic Acids / Q000737:chemistry / Q000528:radiation effects; D012044:Regression Analysis; D012822:Silicon Dioxide / Q000737:chemistry / Q000528:radiation effects; D017550:Spectroscopy, Fourier Transform Infrared; D015040:Zirconium / Q000737:chemistry / Q000528:radiation effects
D003188:Composite Resins; D011109:Polymethacrylic Acids; C083568:Z100 composite resin; C092420:Clearfil Photo Posterior; C074741:Silux Plus; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium