Journal Article

A comparison of tungsten-quartz-halogen, plasma arc and light-emitting diode light sources for the polymerization of an orthodontic adhesive

Bikram S. Thind, David R. Stirrups and Charles H. Lloyd

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 28, issue 1, pages 78-82
Published in print February 2006 | ISSN: 0141-5387
Published online September 2005 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cji076
A comparison of tungsten-quartz-halogen, plasma arc and light-emitting diode light sources for the polymerization of an orthodontic adhesive

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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 Series™) was bonded to each tooth using a light-cured orthodontic adhesive, Transbond XT™. Group 1 (control) specimens were cured with an Ortholux XT™ (tungsten-quartz-halogen bulb) light for 20 seconds, group 2 with an Ortho lite™ (plasma arc) for 6 seconds and group 3 with an Ortholux LED™ 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 ×10 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.

Journal Article.  3289 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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