Effect of various curing lights on the degree of cure of orthodontic adhesives.

Abstract

INTRODUCTION:

The purpose of this study was to compare the percentage degree of cure (%DC) of orthodontic adhesive resins irradiated with 3 types of light sources of various intensities: plasma arc, halogen, and light-emitting diode (LED).

METHODS:

Twenty maxillary incisor stainless steel brackets (0.018-in slot) were divided into 4 groups of 5 brackets each. A standardized amount of composite resin was applied to each bracket base, simulating its clinical application. The brackets were light-cured with a halogen light for 20 seconds (10 seconds each from the incisal and cervical bracket edges), an LED light for 20 seconds (10 seconds per edge), a plasma light for 10 seconds (5 seconds per edge), and an LED light for 10 seconds (5 seconds per edge). The %DC was assessed by using micro-multiple internal reflectance Fourier transform infrared spectroscopy, and the results were analyzed with 1-way ANOVA.

RESULTS:

Overall, the LED and the halogen lights, with the 20-second regimen, produced higher %DC. No significant difference was found in %DC between the plasma light and the 10-second LED light, whereas both showed lower %DC compared with 20 seconds of halogen or LED light.

CONCLUSIONS:

Significant variations in %DC are associated with the various light-curing units, which must be considered in selecting the light source and the irradiation time.

• Authors: Markus Niepraschk, Christos Rahiotis, T Gerard Bradley, Theodore Eliades, George Eliades
• Journal: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics (Am J Orthod Dentofacial Orthop) Vol. 132 Issue 3 Pg. 382-4 (Sep 2007) ISSN: 1097-6752 [Electronic] United States
• PMID: 17826608 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Halogens
• Resin Cements
• Xenon

Topics

• Analysis of Variance
• Dental Bonding
• Dental Equipment
• Dental Stress Analysis
• Halogens
• Light
• Orthodontic Appliances
• Phase Transition
• Resin Cements (radiation effects)
• Semiconductors
• Spectroscopy, Fourier Transform Infrared
• Xenon