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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/14582

Title: The effect of different light curing systems on the bond strength of
Authors: AbdulAziz Abdullah Al-Kheraif Ph.D.
Keywords: Ceramic laminate veneer, resin curing, plasma-arc light, LED
Issue Date: 2008
Publisher: Al Azhar Dental Journal
Abstract: High-intensity chair-side curing units have recently become commercially available. Among these new units, plasma-arc lights (PAC) and light emitting diodes (LEDs), with an energy peak at wavelengths between 460 and 480 nm are expected to allow efficient polymerization of most types of composite resin in a shorter time compared to commonly use conventional quartz-tungsten-halogen (QTH) lights. The success of ceramic veneer is greatly determined by the strength and durability of the bond between the three different components of the bonded veneers which are the tooth surface, the luting resin, and the ceramic veneer. The resin cement combination was exposed to three different photo polymerization units. The bond strength of the light-cured resin was evaluated by shear tests and SEM observations of the fracture surfaces. Statistically significant differences were found between the bond strength of veneers exposed to LED or conventional lights and PAC unit (P < 0-001). There was no significant difference in the mean shear bond strength values between the halogen and LED lights regardless the shade or the thickness of the ceramic veneers. It was found that plasma-arc curing for 6 s was not sufficient to obtain bond strengths similar to those of specimens polymerized with LED or halogen light for 40 s, whereas the plasma-arc was not sufficient to achieve similar failure patterns for darker-shade porcelain of 2 mm thickness. The bond strength achieved by LED or halogen lights was found to be relatively unaffected by the shade or translucency of the ceramic veneers.
URI: http://hdl.handle.net/123456789/14582
Appears in Collections:College of Applied Medical Sciences

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