Mimicking natural dentin using bioactive nanohybrid scaffolds for dentinal tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Dental Research

Background:

• Natural dentin's complex porous structure presents a significant challenge for regeneration.
• Developing synthetic biomaterials that mimic dentin's architecture is crucial for effective tissue engineering.

Purpose of the Study:

• To create and evaluate synthetic nanohybrid matrix scaffolds that replicate dentin's tubular structure.
• To assess the biocompatibility and regenerative potential of these scaffolds in vivo.

Main Methods:

• Fabrication of poly(ethyl methacrylate-co-hydroxyethyl acrylate) scaffolds with aligned tubular pores, some incorporating a silica nanophase and hydroxyapatite coating.
• Subcutaneous implantation in immunocompromised mice for 4, 6, and 8 weeks.
• Analysis of scaffold structure, cell colonization, neovascularization, inflammation, and macrophagic response using microscopy and immunohistochemistry.

Main Results:

• Scaffolds successfully mimicked dentin's ultrastructural pattern and histological features.
• The materials supported significant cell colonization and neoangiogenesis (new blood vessel formation).
• Mineralized interphases enhanced cellular distribution and viability, resembling a neodentinal pattern, with odontoblast-like processes invading scaffold tubules.

Conclusions:

• The developed synthetic dentin scaffolds demonstrate excellent biocompatibility and promote key regenerative processes.
• These biomaterials show significant potential for applications in dentin regeneration and tissue engineering strategies.
• The incorporation of mineralized interphases appears to be a promising approach for improving cellular response and achieving a neodentinal pattern.