“Comparative Evaluation of Compressive Strength of a Hybrid Composite Cured with Halogen Light Curing Unit and Three Different Modes of Blue-Light Emitting Diode: An in Vitro Study”.

Abstract

INTRODUCTION: The increasing use of composite restorative materials has led to rapid rise in the number of light activation units1. The visible light curing units usually use tungsten halogen light source and still it is the most popular method of delivering the blue light. There are worries with the nature of restoring when traditional quartz tungsten halogen (QTH) light units are utilized. A lessening in light yield with time and with separation may bring about a low level of change and a shallow profundity of fix, which thusly decrease the nature of the last restoration2. To defeat these disadvantages, RW Mills1 proposed strong state light producing diode. Driven innovation uses gallium nitride blue LEDs and produce slender range of light. The properties of composite restoration thus get influenced by the light source and its intensity, so it is of thorough importance to have a proper knowledge about them.

AIM: To evaluate the compressive strength of submicron hybrid composite cured with halogen light curing unit in comparison with three different modes of blue light emitting diode.

METHOD: 40 cylindrical composite specimens are prepared using hybrid composite. Out of which, 10 samples (group 1) are cured with halogen light. For the remaining thirty specimens, three different phases of LED are used.10 samples with soft start curing mode (group 2), 10 samples with pulse curing mode (group 3) and 10 samples with continuous curing mode (group 4). These samples are then checked for compressive strength using universal testing machine. The data is statistically analyzed using one way ANOVA test.

RESULT: the mean value of soft start (298.33) is highest followed by halogen(298.249),pulse start(278.122) least in continuous(277.676).

CONCLUSION: The specimens cured with soft start mode of blue light emitting diode showed the highest values of compressive strength.