Comparison of light-emitting diode-curing unit and halogen-based light-curing unit for the polymerization of orthodontic resins: An in vitro study

Abstract

Aims and Objectives:Conventionally, composites are cured using halogen-based light-curing units (LCUs). However, recently, light-emitting diode (LED) LCUs have been introduced commercially, claiming many advantages, yet producing comparable bond strength even when cured with single LED LCUs. This present study was undertaken to compare the shear bond strength of orthodontic brackets bonded to teeth with conventional halogen LCU (3M ESPE Elipar 2500) and LED LCU (3M ESPE Elipar FreeLight 2) and to determine the site of bond failure.Materials and Methods:Fifty extracted human bicuspid teeth were randomly divided into two groups of 25 each. All the teeth were etched and primed. Then, orthodontic brackets were bonded onto the teeth with the light-cured adhesive (Transbond XT, 3M Unitek), and the adhesive was cured with halogen LCU and LED LCU for Group I and Group II, respectively. The brackets were then subjected to shear stress using a Hounsfield universal testing machine at a crosshead speed of 1 mm/min. The force was recorded in Kgf and converted to MPa. The residual adhesive was scored based on the modified adhesive remnant index (ARI) using an optical stereomicroscope. The data were analyzed using the Student's t-test and the Mann–Whitney test at a significance level of 0.05.Results:The results have shown that there is no significant difference between the shear bond strengths and the ARI scores of both the groups.Conclusion:From this study, it can be concluded that (1) LED LCUs containing even only a single LED can cure the composite as well as a halogen-based LCU; (2) there is no statistically significant difference in the shear bond strengths of the two groups; and (3) the ARI scores show no significant difference.

A Study on the Photopolymerization Kinetics of Selected Dental Resins Using Fourier Infrared Spectroscopy (FTIR)

“…So far, the following methods have been used to determine the DC: Fourier infrared absorption spectroscopy (FTIR) [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ], Raman spectroscopy [ 23 , 24 ], electron paramagnetic resonance (EPR) [ 25 ], nuclear magnetic resonance (NMR) [ 26 ], and differential scanning calorimetry (DTA) [ 27 , 28 ].…”

Evaluation of Light-Emitting Diodes’ Effects on the Expression Level of P53 and EGFR in the Gingival Tissues of Albino Rats

“…Currently, various technologies use light in curing of dental composites, for instance, Halogen lamps, plasma arc lamps, lasers, and light-emitting diodes (LEDs). These technologies are different in their principles; light-emitting diode light-curing units (LCUs) are the most developed and commonly used devices by dentists [1,2]. The broader spectral output and high irradiation and power output of LED LCUs made the device the most popular; it can polymerize a wider range of resin by producing free radicals, initiating polymerization [3,4].…”