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Composite conversion and temperature rise using a conventional, plasma arc, and an experimental blue LED curing unit
Author(s) -
Tarle Z.,
Meniga A.,
Knežević A.,
Šutalo J.,
Ristić M.,
Pichler G.
Publication year - 2002
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2002.00866.x
Subject(s) - light emitting diode , materials science , plasma , fourier transform infrared spectroscopy , diode , photopolymer , incandescent light bulb , curing (chemistry) , optics , optoelectronics , analytical chemistry (journal) , chemistry , composite material , polymerization , physics , chromatography , quantum mechanics , polymer
The objective of this study was to evaluate the degree of conversion and temperature rise in three different composite materials when illuminated by an experimental light source [blue superbright light emitting diodes (LEDs)] and compared with plasma light and traditional photopolymerization unit. The degree of conversion and temperature rise were measured using Fourier transform infrared (FTIR) spectroscopy and digital multimeter, respectively. The results revealed significantly higher degree of conversion values in case of conventional curing than with other two light sources whereas temperature rise was significantly lower when blue LEDs and plasma light were used. There were great differences in light intensities between blue LEDs of only 9 mW cm –2 compared with plasma light of 1370 mW cm –2 and Elipar II of 560 mW cm –2 . Better match of LED spectral distribution peak to camphorquinone absorption distribution peak probably explains much lower intensities used for similar photopolymerization effect like in the case of rapid plasma lamp curing.