Physical property comparison of 11 soft lining materials as a function of accelerated aging

Soft denture-lining materials are an important treatment option for patients who have chronic soreness associated with dental prostheses. Three distinctly diRerent types of materials are generally used. These are plasticized polymers or copoly-mers, silicones, or polyphosphazene fluoroelastomer. The acceptance of these materials by patients and dentists is variable. The objective of this study is to compare the tensile strength, percent elongation, hardness, tear strength, and tear energy of eight plasticized polymers or copolymers, two silicones, and one poly-phosphazene fluoroelastomer. Tests were run at 24 hours after specimen prepara-tion and repeated after 900 hours of accelerated aging in a Weather-Ometer device. The data indicated a wide range of physical properties for soft denture-lining materials and showed that accelerated aging dramatically atfected the physical and mechanical properties of many of the elastomers. No soft denture liner proved to be superior to all others. The data obtained should provide clini-cians with useful information for selecting soft denture lining materials for patients. (J PROSTHET DENT 1993;69:114-9.