Evaluation of some physical properties of two permanent heat cure silicone soft lining materials

الملخص EN

Background: Soft lining materials has a key role in modern prosthodontics because of their capability of restoring health of inflamed and distorted mucosa, but with two major problems; water sorption, solubility, and lack of bond to the underlying denture base materials.

The aim of this study was to examine water sorption and solubility for two types of permanent heat cure silicone soft lining materials (Permaflex and Molloplast-B), applied for different types of acrylic denture base surface and stored in artificial saliva to evaluate the tensile bond strength.

Materials and methods: Two types of permanent heat cure silicone soft lining materials was applied to different type of surfaces acrylic denture bases for tensile testing.

Water sorption and solubility test was done according to ADA No.

12 specification for 1, 3, and 6 weeks intervals.

Results: There was no significant changes in sorption and solubility with time of water storage from (1st-- 3rd week), for Permaflex soft lining materials, and significant decrease water storage from (3rd -- 6th week) for sorption only, and for Molloplast –B soft lining materials no significant changes for sorption of water storage from (1st–3rd– 6th week), solubility revealed a significant changes with time for water storage from (1st – 3rd – 6th week).

Conclusion: This study indicated that heat cure soft lining materials shows some degree of water sorption and solubility, the lowest level was obtained by Permaflex soft lining material.

Artificial saliva storage decrease the tensile bond strength for the two types of soft lining materials except for Permaflex sandblasted type of surface increase after artificial saliva storage.

Key words: Heat cure silicone soft lining material, acrylic denture base, water sorption and solubility, tensile bond strength.

(J Bagh Coll Dentistry 2008; 20(2)20-25)