Abstract
Recently, silicone has been widely used for soft liners and related materials. The purpose of this investigation was to examine the adhesive strength of a silicone material (MDX-4-4210) to acrylic resins and to discussed the possibility to clinical application (especically, for the case of soft palate substance defects). The materials tested were code-named MDX-4-4210 and four commercial materials (Kurepate, Neo-Snugger, Super-Soft and Viscogel). The adhesive strength of each material was investigated using Instron testing machine.
The mean adhesive strengths under tension to acrylic resins were 16.2kg/cm2 for MDX-4-4210, 83.6kg/cm2 for Kurepate, 11.6kg/cm2 for Neo-Snugger, 28.8kg/cm2 for Super-Soft and 3.0kg/cm2 for Visco-gel. Furthermore, the mean adhesive strengths under shear were 6.5kg/cm2 for MDX-4-4210, 100.4kg/cm2 for Kurepate, 7.4kg/cm2 for Neo-Snugger, 22.4 kg/cm2 for Super-Soft and 1.8kg/cm2 for Visco-gel.
From these results, it can be seen that the adhesive strength of MDX-4-4210 to acrylic resin is retatively small, However, the deformation of MDX-4-4210 obtained when debonding from acrylic resin occured was the highest of the materials used in this investigation and attained its maximum value of 15mm.
It can be seen that this property of MDX-4-4210 is clinically favourable since it is considered that the movement of denture and the displacement of soft tissue are relatively marked, during masticating.
