Abstract
Aims: To determine the correlation between intensity (I) of light–emitting diode (LED) and tungsten–halogen light sources, and depth of cure of a resin composite at different distances. Materials and Methods: LED curing light (Ultra Lite 200E plus) and tungsten halogen light (Astralis 5 Vivadent) were evaluated. Intensity was measured at distances of 0, 2, 4, 6, 8, and 10mm between the light tip and detector. A blackened aluminum plate, 0.5mm thick, with a 4mm–diameter aperture was placed over the detector. The use of this aperture limited the amount of light reaching the detector to a uniform area for both curing lights and also corres-ponded to the area of the mould for the depth of cure studies. Both light tips were centered on this aperture to reduce any influence of varying I across the light tip. Depth of cure (DOC) of light–curing universal micro hybrid composite shade A2 was also measured. A metallic mould was used to measure the depth of cure at distances of 0, 2, 4, 6, 8, and 10mm between light tip and mould. The degree of divergence of the light of both light curing units was also determined by tracing the illuminated area at a 10mm distance for each of the curing lights. Results: For both lights, intensity decreased as distance increased. While, both I and DOC decrease with increasing distance, the relationship between these factors and distance may not be similar for both lights and may depend on the characteristics of individual lights. Conclu-sions: Both I and DOC decreased with increasing distances. DOC usually decreases with de-creasing I, the rate of decline varies between various light brands.
Highlights
In recent years, the popularity of esthetic restorations has promoted a rapid increase in use of resins
Table [1] showed the one way analysis of data (ANOVA) for the intensity of light–emitting diode (LED) and Halogen light which demonstrated a significant difference between LED and Halogen
Our results show that the depth of cure (DOC) reduced (Figure 2) with increasing distance from the resin composite surface
Summary
The popularity of esthetic restorations has promoted a rapid increase in use of resins. Because the polymerization of light–cured resins depends mainly on the characteristics and the type of radiation source used, a way to achieve better properties of the final restoration cured is the improvement of the curing unit[1,2,3,4]. In this direction, in the last few years, curing light technology has advanced with the introductions of high intensity (I) halogen lights, LED and plasma arc lights for resin composite polymerization. Most of the above mentioned parameters can be controlled in www.rafidaindentj.net
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