Sorption rate evaluation of flowable composite materials by using different photo-activation methods: a spectroscopic analysis

ABSTRACT

To determine the sorption rate of flowable dental composites by using different photo-activation techniques. Ninety specimens of 3 different dental composites were used for study. 7mm in diameter and 2mm thick disc of each material were prepared in the laboratory by using brass moulds. 30 samples were polymerized each by Quartz Tungsten Halogen [QTH], Light Emitting Diode [LED] and Ultraviolet B [UVB] light curing units. Samples were taken out from mould and placed in clean glass tube, immersed in 2% methylene blue solution and placed in incubator for 24hrs. Absorbance was detected at 590nm by using Visible Spectrophotometer. The significant results were observed by using both Light Emitting Diode and Quartz Tungsten Halogen light units [*P< 0.01]. Ultraviolet B narrowband light found to be inappropriate for polymerization purpose. Similarly, composite Clinpro and Bioseal showed significant results in every photo-activation method [*P<0.01]. Light Emitting Diode units were as efficient in curing resin composite as Conventional Halogen lamps are. Ultraviolet B narrowband light was not appropriate in activation of dental composite while Clinpro and Bioseal are efficient flowable composites