The European Journal of Orthodontics Advance Access originally published online on September 30, 2005
The European Journal of Orthodontics 2006 28(1):78-82; doi:10.1093/ejo/cji076
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A comparison of tungsten-quartz-halogen, plasma arc and light-emitting diode light sources for the polymerization of an orthodontic adhesive
* Department of Orthodontics and Restorative Dentistry, Glenfield Hospital, Leicester and ** University of Dundee Dental School, Scotland, UK
Address for correspondence Mr B. S. Thind, Department of Orthodontics and Restorative Dentistry, Glenfield Hospital, Groby Road, Leicester LE3 9QP, UK. E-mail: bikram_chaman{at}yahoo.com
This study investigated whether there were differences between the debond stress and adhesive remnant index (ARI) of an adhesive cured with three different orthodontic light sources. Sixty sound premolar teeth were divided into three groups of 20. A standard pre-adjusted edgewise premolar bracket (Victory SeriesTM) was bonded to each tooth using a light-cured orthodontic adhesive, Transbond XTTM. Group 1 (control) specimens were cured with an Ortholux XTTM (tungsten-quartz-halogen bulb) light for 20 seconds, group 2 with an Ortho liteTM (plasma arc) for 6 seconds and group 3 with an Ortholux LEDTM light-emitting diode for 10 seconds. The specimens were debonded 24 hours later using a universal mechanical testing machine, operating at a crosshead speed of 0.5 mm minute–1.
The Weibull modulus and a Logrank test showed no statistically significant differences between the three groups for debond stress. The ARI was assessed at x10 magnification. The ARI scores for group 2 were significantly different (P < 0.01) from those of groups 1 and 3 (between which there was no significant difference). For group 2 there was a greater tendency for failure to occur at the adhesive/tooth interface than for the other two groups. There appears to be no reason why any of the three types of light source cannot be used in orthodontics. Polymerization, as effective as that produced by conventional bulb light sources, was obtained with the short exposure times recommended for the plasma arc or light-emitting diode sources.
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