Mechanical Evaluation of Boron Nanoparticle-Modified Silicone Elastomers for Maxillofacial Prostheses

Area of Science:

• Materials Science and Engineering
• Polymer Science
• Nanotechnology

Background:

• Silicone elastomers are crucial biomaterials, particularly for maxillofacial prostheses.
• Enhancing mechanical properties of silicone elastomers through nanoparticle reinforcement is an active area of research.
• Boron nanoparticles (BNPs) offer unique properties that could potentially improve elastomer performance.

Purpose of the Study:

• To investigate the effects of varying concentrations of boron nanoparticles (BNPs) on the mechanical properties of two distinct silicone elastomers (A-2000 and A-2006).
• To determine the influence of BNP incorporation on tensile strength, tear strength, hardness, and elongation of the selected elastomers.
• To assess the suitability of BNP-modified elastomers for applications such as maxillofacial prostheses by analyzing property trade-offs.

Main Methods:

• Preparation of 180 silicone elastomer specimens, including control groups and groups with 1 and 3 wt% BNPs.
• Mechanical testing according to ASTM and ISO standards: tensile strength, tear strength, and Shore A hardness.
• Assessment of surface roughness using Atomic Force Microscopy (AFM).

Main Results:

• Tensile strength generally decreased with BNP addition, with A-2000 showing a more pronounced reduction than A-2006 at lower concentrations.
• Tear strength in A-2000 decreased initially but recovered at higher BNP concentrations, while A-2006 showed no significant changes.
• Hardness significantly increased with BNP incorporation in both elastomers, particularly at 3 wt%.
• Elongation at break decreased significantly in A-2006 with BNP addition, while A-2000 showed no significant change but differences between BNP concentrations.

Conclusions:

• The mechanical properties of silicone elastomers A-2000 and A-2006 are significantly influenced by the concentration and type of boron nanoparticles (BNPs).
• BNP incorporation can enhance hardness but may compromise tensile strength and elongation, indicating a trade-off between properties.
• Both A-2000 and A-2006 are potential candidates for maxillofacial prostheses, but careful optimization of BNP concentration is necessary to achieve desired mechanical balance.