Despite considerable improvements of dental composite materials, the present-day composite resins still suffer from two major short- comings that limit their use: inadequate degree of conversion and polymerization shrinkage. The objective of this study was to evalu- ate the degree of conversion and polymerization shrinkage of two hybrid and two microfilled composite materials cured by pulsed blue dye laser pumped XeCl excimer laser at 308 nm and the stan- dard curing unit. The degree of conversion was measured by a Perkin Elmer FTIR spectrometer at the surface of the material and at a 3.0 mm depth.
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