Abstract
Six types of resin-retentive devices with different inter-bead distance were prepared and tensile bone strengths between metal specimens and opaque resins were evaluated.Maximum bond strengths were achieved when the inter-beads distance was one half of the beads-diameter or when the inter-beads distance was equal to the diameter of the retentive bead particle.
The effect of a metal adhesive primer combined with mechanical retentive devices on bond strength between metal substructure and opaque resin was also evaluated.The potential of reduction of mechanical retentive devices using metal adhesive promoter was examined by means of tensile test and dyepenetration test.The results suggested that the retentive beads may be approximately 40% removed when a metal adhesive primer was applied to the metal substructure.
