SEM assessment of the nature of the interface between molloplast-B and denture base materials

Silicone resilient liners possess most of the required properties of denture liners, however they poorly bond to denture bases. It was the purpose of this investigation to microscopically assess the nature of the interface between a denture liner and three acrylic bases as affected by some parameters. A heat-cured silicone liner (Molloplast-B) and three commercially available acrylic denture base materials were used in this study. Each test specimen composed of Molloplast-B that was bonded to both sides of a denture base blank. Prior to packing the liner, the surfaces of each denture base blank were treated. The surface treatment included either application of a primer or roughening. In other test specimens, the liner was packed against "uncured" resin. In addition, the interfaces of "precured" specimens were examined in both wet and dry conditions. SEM examination revealed that the three denture base materials varied in the nature of their interfaces with the denture liner. Satisfactory junction was observe when the liner was packed against "uncured" acrylic bases. After aging in water, the liner/denture base interface displayed numerous wide gaps with slight changes in Molloplast-B surface texture. This could be attributed to water sorption by the liner and subsequent swelling of its structure.King Saud Universit