Abstract
LED light-curing devices seek to provide a cold light activator which allows protocols of material polymerization with shorter duration. The present study aimed to evaluate the shear bond strength of bracket bonding using three types of light-curing devices: One with halogen light (Optilight Plus - Gnatus) and two with LEDs (Optilight CL - Gnatus and Elipar Freelight - 3M/ESPE). Comparing the results by analysis of variance, the Gnatus LED device showed an inferior statistical behavior in relation to other light sources, when activated by a short time. But, when it was used for 40 seconds, the polymerization results were consistent with the other evaluated sources. The device with the best average performance was the halogen light, followed by the 3M/ESPE LED. It was concluded that the LEDs may be indicated in orthodontic practice, as long as a protocol is used for the application of light with the activation time of 40 seconds.
Highlights
LED light-curing devices seek to provide a cold light activator which allows protocols of material polymerization with shorter duration
The samples were prepared by a dentist with clinical experience in orthodontics and in bracket bonding, not needing help from other operators in the experiment, in order to minimize the possibilities of inter-operator errors
To study the comparisons between the groups, since the measured data followed approximately normal distributions, the analysis of variance was chosen when comparing the statistical similarity of the five groups
Summary
LED light-curing devices seek to provide a cold light activator which allows protocols of material polymerization with shorter duration. Objective: The present study aimed to evaluate the shear bond strength of bracket bonding using three types of light-curing devices: One with halogen light (Optilight Plus - Gnatus) and two with LEDs (Optilight CL - Gnatus and Elipar Freelight - 3M/ESPE). Results: Comparing the results by analysis of variance, the Gnatus LED device showed an inferior statistical behavior in relation to other light sources, when activated by a short time. When it was used for 40 seconds, the polymerization results were consistent with the other evaluated sources. Conclusion: It was concluded that the LEDs may be indicated in orthodontic practice, as long as a protocol is used for the application of light with the activation time of 40 seconds
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