Polymerization Depths of Contemporary Light-Curing Units Using Microhardness

摘要: Purpose: This research investigated composite depths of cure using a variety light-curing units and exposure protocols. Materials Methods: Composite (Herculite XRV, shade A2, Kerr, Orange, California) was exposed in opaque compules to conventional quartz tungsten halogen (QTH) units, soft-start high-intensity QTH plasma arc (PAC) curing lights, one argon laser. Cured were sonicated remove uncured sectioned polished along the long axis expose cured composite. Knoop hardness measured 0.5 mm from irradiated, top surface then at 1.0 1.0-mm increments until reliable readings could no longer be obtained. Hardness values compared by analysis variance similar within specific curing-light classification, standard 40-second as comparison (Dunnett's t-test). Depth defined deepest value found equivalent that 0.5-mm depth for light scenario. Results: Conventional lights provided profiles. At 2-mm depth, use different unit or tip made difference with standard. this (pulse-delay step-cure) methods yielded High-intensity 10 seconds exposure. Plasma less than produced inferior A 10-second PAC 5-second laser gave almost all scenarios not greater 2 mm. CLINICAL SIGNIFICANCE Similar-type diameter (8 12 mm) provide characteristics. Soft-start techniques profiles those achieved technique when used according manufacturer's recommendations. can reduce time while providing curing. should least duration Even consideration still homogeneous hardness.