Tuning Biodegradation and Physicochemical Features of PLA/HAp Biomaterials by Incorporating Nanofibrillated Cellulose...

Area of Science:

• Biomaterials Science
• Polymer Science
• Tissue Engineering

Background:

• Biomaterials are crucial for bone regeneration, providing porous scaffolds that mimic natural bone structure.
• Biodegradable materials eliminate the need for secondary surgeries for implant removal.
• Controlling the degradation rate of biomaterials is essential for effective tissue regeneration.

Purpose of the Study:

• To modify the degradation rate of a polylactic acid (PLA)-based composite biomaterial.
• To incorporate hydroxyapatite (HAp) and nanofibrillated cellulose (NFC) to tune porosity and degradation.
• To enhance compatibility between NFC and the PLA/HAp matrix using colloidal processing.

Main Methods:

• Fabrication of a biodegradable composite material using polylactic acid (PLA) reinforced with hydroxyapatite (HAp).
• Incorporation of varying ratios of nanofibrillated cellulose (NFC) into the PLA/HAp matrix.
• Utilizing a colloidal processing approach for improved NFC dispersion and matrix compatibility.
• Mechanical property testing, hydrophilicity assessment, and degradation rate analysis.

Main Results:

• Adjusting the hydroxyapatite (HAp)/nanofibrillated cellulose (NFC) ratio normalized mechanical properties, despite NFC generally decreasing them.
• The incorporation of HAp/NFC enhanced the composite material's hydrophilicity.
• Increased NFC content in the composite matrix was directly proportional to accelerated degradation rates.
• Controlled porosity and tunable degradation were achieved through NFC incorporation.

Conclusions:

• The developed biodegradable composite biomaterial offers tunable porosity and degradation rates.
• This advancement holds significant potential for personalized medicine in bone tissue regeneration.
• The findings pave the way for novel therapies and patient-specific treatments in regenerative medicine.