[A basic study on newly developed light-curing resins--Fitness, flexural properties and bond strength to self-curing...

The objectives of this study were to evaluate fitness, bending properties, and bond strength of newly developed light-curing denture base resins (Eclipse, Dentsply) in contrast with conventional heat-curing denture base resins (Acron, GC). These evaluations were performed by fitting tests, bending strength tests, and shear bond strength tests. For the fitting test, 40 resin specimens, 20 for each resin, were made on plaster models, which simulated the maxillae edentulous ridge. The gaps between resin specimens and the plaster model were measured. The bending strength tests were carried out using 16 resin plate specimens (65 x 10 x 2.5 mm). The bending strength and elastic modulus for each denture base resin was calculated. For the shear bond strength test, self-curing resins were bonded to each resin and in total, 32 bonded specimens (20 x 4 x 2.5 mm) were made. The shear bond strength tests were carried out in order to evaluate the bond strength between the self-curing resin and each denture base resin. The results of these tests revealed that Eclipse exhibited better fitness to the plaster model, larger bending strength, and larger elastic modulus than Acron. Furthermore, the bond strength of Eclipse to self-curing resin was equivalent to that of Acron. These results suggest that Eclipse has excellent properties for application in clinical settings.