53 research outputs found
Characterizing ceramics and the interfacial adhesion to resin: II- the relationship of surface treatment, bond strength, interfacial toughness and fractography
Measuring the Radiopacity of Luting Cements, dowels, and Core Build-up Materials with a Digital Radiography System Using a CCD Sensor
Effects of extending duration of exposure to curing light and different measurement methods on depthâofâcure analyses of conventional and bulkâfill composites
Effect of Light Power Density on Development of Elastic Modulus of a Model Light-Activated Composite during Polymerization
Effect of Ramped Light Intensity on Polymerization Force and Conversion in a Photoactivated Composite
Composite depth of cure using four polymerization techniques
The light-curing technique is relevant to reduce the degree of polymerization shrinkage, improving clinical and esthetic success of composite resin restorations. OBJECTIVE: To evaluate in vitro the effect of four light-curing techniques on depth of cure of a composite resin. MATERIAL AND METHODS: Ten specimens of a composite resin were made in cylindrical cavities prepared in PVC plates (3.0 X 7.0 mm) for each light-curing technique. Four photoactivation methods were investigated: stepped, ramped, pulse-delay and traditional. Specimens were longitudinally sectioned and polished for microhardness measurements (kg/mmÂČ), which were made at 0.1, 1.0, 2.0 and 4.0 mm from the irradiated surface. Data were subjected to ANOVA and Tukey's test. RESULTS: The effect of factors studied (curing method and distance from the surface) and the interaction of these factors was statistically significant (p<0.05). The traditional method of cure provided higher microhardness values (69.6 ± 2.5) than the stepped (63.5 ± 3.1) and pulsed (63.9 ± 3.2) methods at all depths evaluated, but it did not differ from the ramped method (66.7± 4.4) at 0.1 and 1.0 mm of depth. CONCLUSION: All techniques employed provided satisfactory cure of the composite resin up to the depth of 2.0 mm from the irradiated surface
Effect of Two Abrasive Systems on Resin Bonding to Laboratory-Processed Indirect Resin Composite Restorations
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