To Determine The Functional Efficacy of Led Units in Various Clinical Offices

Abstract

Aim: Light units used for polymerization of resin composites are subject to deterioration with age, and frequent maintenance is required to maintain optimal efficacy. The aim of this study was to examine the efficacy of LED units in private dental offices in Baddi (H.P) for polymerization of resin composites. Materials and Methods: Twenty dental offices met all selection criteria and agreedto participate in the study. To measure light intensity, an analogue radiometer was used. The probe of each LED unit was placed and then measurements of light intensities were recorded for each light unit and the data was statistically analysed. Results: The light intensity of the individual units varied widely. The results revealed that there was error of 35% and a standard deviation of 155.76 among the intensities of various LED Units checked in the study. Conclusions: Light polymerization units in private dental offices displayed a wide rangein light intensity, and many had below-recommended levels. A positive linear relationship was found between light intensity and photoactivation effectiveness. Dentists should regularly monitor the condition of light units and replace deteriorating parts.

Penetration capability of three different light curing units to composite-resin as measured by radiometer

“…Most light-polymerized composite-resin contain a camphoroquionone, which initiates polymerization by breaking down into free radicals when exposed to light in the blue spectrum at wavelengths 400-500 nm range. 5,6 composite-resin failure is not only come from the material components, but could be come from inappropriate technique or method of placement of restoration, and inadequate polymerization. 7 Composite-resin polymerization could be done by light curing unit (LCU).…”

“…4 Energy densities (mWs/cm 2 ) in the product of light intensity and irradiation time, have been suggested to account for variation in irradiation intensity, time and mode. 5 Light units less than 300 mW/cm 2 is not recommended. It will create inadequate polymerization of composite-resin.…”

“…Light-curing units at lower power density level would decrease the mechanical properties of some resin-based composites. 5,9 The best method for evaluation of the LCU intensities output is using a radiometer. Fortunately, some newer LCU have a radiometer included the buying package.…”