Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5207722 | Polymer Testing | 2006 | 7 Pages |
Abstract
This study used infrared spectroscopy to compare the degree of conversion (DC) of Z250 resin composite at different depths, using a variety of light-curing sources. Photo-activation was performed with: plasma arc (PAC) light, a blue light emitting diode (LED) and four different exposure scenarios using quartz-tungsten-halogen (QTH) light. Cured composite cylinders were transversally cut into 300 μm-thick slices corresponding to surface, 1-5 mm depths. Each disc was finely pulverized, incorporated into KBr pellets, and analyzed by FTIR. Results demonstrated that for the surface and depths of 1 and 2 mm, conversion values did not differ significantly between lights or exposure treatments. At 3 and 4 mm depths, the LED source showed significantly higher DC than did the PAC light. All QTH methods were not significantly different to either LED or PAC. At 5 mm, there was no significant difference in DC between methods, except that PAC was not able to cure the composite.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Andresa Carla Obici, Mário Alexandre Coelho Sinhoreti, Elisabete Frollini, Lourenço Correr- Sobrinho, Mario Fernando de Goes, Guilherme Elias Pessanha Henriques,