Sheer bond strength of resin teeth to heat-cured and light-cured denture base resin

The failure of the bond between acrylic resin teeth and denture base materi al remains a considerable problem. Previous research has indicated that the introduction of a bonding agent to the tooth-resin interface significantly increased the tensile bond strength. To further investigate this finding, and to complement the earlier study, a shear strength assessment was carrie d out. Both a commercial and an experimental bonding agent were evaluated f or tooth retention when applied to heat-cured and visible light-cured (VLC) resin. A significant increase in shear bond strength was obtained when bon ding agents were applied. The experimental cement gave the greatest increas e in strength, although the VLC resin failed to achieve the same degree of tooth attachment as the heat-cured resin.