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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/14575

Title: The Effect of Light Exposure Time Variations on Shrinkage Strain Kinetics of Resin-based Composite Materials
Authors: AbdulAziz Abdullah Al-Kheraif Ph.D.
Keywords: - Shrinkage strain, Light cure, Resin composite, Exposure time.
Issue Date: 2010
Publisher: Journal of King Saud University, Dental Sci
Abstract: Abstract. The aim of this study was to analyze the effect of conventional quartz-tungsten-halogen (QTH) light exposure time variations on shrinkage strain kinetics of resin-based composite materials to determine whether there are differences among them. Two photo activated resin composites were selected. The bonded-disk technique was used to measure shrinkage-strain kinetics. Measurements were obtained continuously for 30 min by irradiation for 20s, 40s, 60s, 80s, and 100s at 750 mW/cm2 at 23°C. Three measurements (n = 3) were made per material. The data were analyzed using ANOV A tests. The shrinkage strain of the composite resins at 40s, 60s, 80s, and 100s exposure to light were always significantly higher than the 20s exposure (p<0.05) whereas there was no significant difference between 40s, 60s, 80s, and 100s exposure for both the materials (p>0.05). The data show that Ecusit® resin had higher shrinkage strain than Gradia ® Direct (p<O.05). The extent of polymerization of a light cured resin composite, increased with recommended time, 40s, compared to underexposure time, 20s, and a photo-activated composite restorative resin should be irradiated for 40s to achieve adequate polymerization.
URI: http://hdl.handle.net/123456789/14575
Appears in Collections:College of Applied Medical Sciences

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