Growth Factor Liberation and DPSC Response Following Dentine Conditioning

Area of Science:

• Biomaterials Science
• Regenerative Dentistry
• Cell Biology

Background:

• Dentine conditioning is key for adhesive restorations but lacks biological guidance for pulp protection and regeneration.
• Understanding how dental materials interact with dentine's bioactive molecules is crucial for stimulating dentinogenesis.

Purpose of the Study:

• To investigate the impact of dentine conditioning using common dental etchants on growth factor release.
• To assess the effect of these conditioned dentine extracts on human dental pulp progenitor cells (DPSCs) differentiation.
• To evaluate dentine regeneration potential by examining DPSC behavior on conditioned dentine slices.

Main Methods:

• Dentine powder and slices were conditioned with ethylenediaminetetraacetic acid (EDTA), phosphoric acid, citric acid, and polyacrylic acid.
• Growth factors released into dentine matrix extracts were analyzed.
• DPSCs were cultured with extracts and on conditioned dentine slices.
• Gene expression and phenotypic changes related to odontoblast differentiation were assessed.

Main Results:

• EDTA, phosphoric acid, and citric acid effectively solubilized growth factors from dentine powder, promoting DPSC differentiation.
• Polyacrylic acid did not release significant proteins, indicating limited bioactivity.
• Conditioning dentine slices with EDTA, phosphoric acid, and citric acid released growth factors and upregulated differentiation markers in DPSCs.
• Phosphoric acid treatment resulted in reduced cell attachment and growth on dentine slices.

Conclusions:

• Dentine conditioning with specific agents can liberate bioactive molecules to stimulate dentine regeneration.
• EDTA and citric acid show promise for promoting DPSC differentiation with better cell viability compared to phosphoric acid.
• Findings inform the development of improved clinical protocols for treating exposed vital pulps.