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Effect of a broad-spectrum LED curing light on the Knoop microhardness of four posterior resin based composites at 2, 4 and 6-mm depths

Materials Science6-Mm DepthsEngineeringOptical PropertiesMechanical EngineeringKnoop MicrohardnessComposite TechnologyLight CuringThermoplastic CompositeMicro-optical ComponentPosterior ResinOptoelectronicsGlass Fiber