Molecular Response of Pulp Fibroblasts after Stimulation with Pulp Capping Materials

Area of Science:

• Dental Materials Science
• Biocompatibility Testing
• Cellular Biology

Background:

• Dental pulp fibroblasts (HDPF) are crucial for pulp repair.
• Evaluating the biocompatibility of dental restorative materials is essential for clinical success.
• Glass ionomer cements (GICs) are widely used, necessitating understanding of their interaction with pulp cells.

Purpose of the Study:

• To evaluate the in vitro cytotoxicity and inflammatory response of HDPF exposed to two GICs (Ketac Molar, Vitrebond), Single Bond, and calcium hydroxide.
• To assess the impact of these materials on cell viability, metabolism, nitric oxide release, and the production of key inflammatory mediators (IL-8, IL-6, SDF-1α).

Main Methods:

• Human dental pulp fibroblasts (HDPF) were cultured using an explant technique.
• Cytotoxicity was assessed via Trypan Blue exclusion and MTT assays.
• Nitric oxide, IL-8, IL-6, and SDF-1α levels were measured using Griess assay and ELISA; gene expression was analyzed by RT-qPCR.

Main Results:

• Calcium hydroxide (Dycal-DY) induced significant cytotoxicity (cell death).
• Ketac Molar (KM) and Vitrebond (VB) increased Interleukin-8 (IL-8) protein and mRNA levels, indicating an inflammatory response.
• KM also stimulated Interleukin-6 (IL-6) production, while nitric oxide levels decreased.
• Stromal derived factor-1 alpha (SDF-1α) was not significantly affected by any material.

Conclusions:

• While calcium hydroxide causes cell death, it may be important for pulp repair processes.
• Ketac Molar and Vitrebond promote inflammatory mediator production, potentially aiding tissue repair, but require cautious use.
• Further research is needed to fully elucidate the long-term effects and optimal application of these materials in pulp capping procedures.