Injectable MXene/Ag-HA composite hydrogel for enhanced alveolar bone healing and mechanistic study

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Alveolar bone defects present significant challenges in dentistry due to complex anatomy and limited natural healing.
• Current bone substitutes have limitations including poor osteoinductivity, rapid degradation, inflammation, and inadequate mechanical properties.
• Irregular defect morphology complicates the use of solid bone substitutes, risking secondary damage.

Purpose of the Study:

• To develop an injectable composite hydrogel for alveolar bone regeneration.
• To integrate MXene nanomaterials into Ag-HA/GelMA hydrogels to create a novel biomaterial.
• To evaluate the mechanical and biological properties of the new composite hydrogel.

Main Methods:

• Fabrication of an injectable MXene/Ag-HA composite hydrogel.
• Assessment of the hydrogel's mechanical properties.
• Evaluation of antibacterial, antioxidant, and osteogenic activities in vitro.
• Analysis of gene expression (Dmp1 and Dusp1) to understand osteogenic mechanisms.

Main Results:

• The MXene/Ag-HA composite hydrogel demonstrated satisfactory mechanical and biological performance.
• The composite hydrogel exhibited excellent antibacterial, antioxidant, and osteogenic activities.
• Gene expression analysis confirmed that the hydrogel promotes osteogenesis by regulating Dmp1 and Dusp1.

Conclusions:

• The MXene/Ag-HA composite hydrogel is a promising candidate for alveolar bone repair and regeneration.
• Integrating MXene nanomaterials enhances the hydrogel's properties for treating irregular alveolar bone defects.
• MXene nanomaterials hold significant potential for diverse biomedical applications beyond bone regeneration.