Dynamic mechanical thermal analysis of denture soft lining materials

Area of Science:

• Materials Science
• Biomaterials Engineering
• Polymer Science

Background:

• Denture soft lining materials are crucial for patient comfort and function.
• Characterizing their mechanical properties under simulated clinical conditions is essential for material selection.
• Previous methods may not accurately reflect in-vivo deformation scenarios.

Purpose of the Study:

• To characterize the deformation properties of long-term denture soft lining materials.
• To evaluate material response to temperature variations relevant to oral conditions.
• To compare the performance of acrylic-based, silicone-based, and alternative formulation materials.

Main Methods:

• Dynamic Mechanical Thermal Analysis (DMTA) was employed.
• Sinusoidal shear deformation (1 Hz, 64 microns peak-to-peak) was applied.
• Testing was conducted across a temperature range of 30-70°C.

Main Results:

• Acrylic materials exhibited decreased moduli (increased compliance) with rising temperature.
• Silicone (Molloplast B) and alternative (Novus) materials showed temperature insensitivity within the tested range.
• Mechanical loss tangent decreased with temperature in acrylics, suggesting glass transition temperatures below 30°C.

Conclusions:

• Material selection should consider temperature-dependent deformation properties.
• Silicone and certain alternative formulations offer superior thermal stability for denture soft liners.
• Acrylic materials may undergo significant plasticization and increased deformation at body temperatures.