A Study of the Interface between Resilient Denture Liners and Polymethylmethacrylate

Abstract

Four of the commonly used resilient denture lining materials were investigated, they were of different chemical composition, physical forms and processing cycles.Scanning electron microscope examinations of the interface between the liners and the regular acrylic resin base material were carried out in an attempt to assess the bonding of these materials to the denture base, and to evaluate the reliability of their use.The effect of water on the liner/denture base interface was also investigated, and the validity of roughening the tissue surface of the denture base prior to processing the liner was assessed.The findings point to the advisability of using the acrylic type of soft liners whenever resilient liners are indicated. Roughening the fitting surface of the denture base to which the resilient lining materials is to be applied has a weakening effect on the bond between the lining and the denture base.Long term exposure of the liners to water has a destructive effect. The infused water into the material leads to swelling and stresses build up at the denture base interface and these tend to promote distortion and reduction in bonding.