Force-displacement properties of a modified cross-linked silicone compared with facial tissues

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Engineering

Background:

• Maxillofacial prostheses aim to restore facial aesthetics and function.
• Current prostheses often lack optimal pliability, impacting patient comfort and realism.
• Silicone-based elastomers are commonly used but require modification for improved mechanical properties.

Purpose of the Study:

• To develop a more pliable silicone-based elastomer for maxillofacial prostheses.
• To investigate the mechanical properties of modified Type A adhesive.
• To compare the force-displacement characteristics of the modified elastomer with human facial tissues.

Main Methods:

• Modification of Type A adhesive with polydimethylsiloxane (MDX 4-4210) at various ratios.
• Determination of force-displacement curves for the modified elastomer specimens.
• Comparison of elastomer force-displacement curves with data from human subjects.

Main Results:

• Some Type A adhesive/MDX 4-4210 ratios exhibited force-displacement slopes comparable to human subjects within the 0.4 to 1.2 N range.
• The mechanical response of the modified elastomers closely mimicked human tissue within a specific force threshold.
• Discrepancies in force-displacement slopes were observed for forces below 0.4 N between elastomers and human subjects.

Conclusions:

• Modification of Type A adhesive with MDX 4-4210 can yield elastomers with biomechanical properties suitable for maxillofacial applications.
• The developed material shows promise for creating more comfortable and realistic facial prostheses.
• Further research is needed to optimize elastomer properties for forces below 0.4 N to fully match human tissue response.