In Vivo and In Vitro Response to a Regenerative Dental Scaffold.

Area of Science:

• Biomaterials Science
• Regenerative Dentistry
• Dental Tissue Engineering

Background:

• The tooth possesses intrinsic self-repair capabilities due to dental pulp stem cells.
• Developing conducive microenvironments is key for dental regeneration.
• A triphasic hybrid dental biocomposite (3HB) offers strength, antibacterial properties, and cell support.

Purpose of the Study:

• To create a malleable, injectable implant by incorporating 3HB into Mineral Trioxide Aggregate (MTA).
• To evaluate the in vitro and in vivo effects of the 3HB+MTA composite on dental pulp cells and tooth regeneration.

Main Methods:

• Human tooth pulp cells (hDPCs) proliferation and viability assays with 3HB, MTA, and 3HB+MTA.
• In vivo implantation of 3HB+MTA into Wistar rat M2 molars.
• Micro-CT for stereological analysis of remaining tooth volume.
• Histological and immunohistochemical analysis of regenerative pulpal architecture, dentinogenesis, and cell populations (odontoblasts, MSCs).

Main Results:

• 3HB+MTA significantly increased hDPC proliferation and cell viability compared to 3HB or MTA alone.
• In vivo, 3HB+MTA promoted regenerative pulpal architecture and reparative dentinogenesis without infection or encapsulation.
• Mesenchymal stem cells (MSCs) migrated into the implant and expressed markers associated with remineralization.

Conclusions:

• The 3HB+MTA composite demonstrates a promising potential as a regenerative scaffold for pulp regeneration.
• Further research is warranted before considering clinical applications for this novel dental biomaterial.