An in vitro pulp chamber with three-dimensional cell cultures

Area of Science:

• Biomaterials Science
• Dental Materials Science
• Cell Biology

Background:

• Assessing the biocompatibility of dental materials is crucial for predicting clinical outcomes.
• Existing in vitro models often fail to accurately replicate the complex in vivo environment of the dental pulp.

Purpose of the Study:

• To develop and validate a three-dimensional (3D) fibroblast cell culture within an in vitro pulp chamber model.
• To evaluate the cytotoxic effects of various dental filling materials using this enhanced model.

Main Methods:

• A 3D fibroblast cell culture was established in an in vitro pulp chamber.
• Dental materials (zinc phosphate cement, glass ionomers, silicone impression material, zinc oxide-eugenol) were tested for 24h exposure.
• Cell viability was assessed using the MTT assay under static and perfusion (0.3 or 5 ml/h) conditions.

Main Results:

• Zinc phosphate cement, conventional glass ionomers, silicone impression material, and zinc oxide-eugenol showed no significant impact on cell viability.
• A light-curing glass ionomer cement significantly reduced cell survival.
• Perfusion at 5 ml/h generally decreased cell vitality, though overall perfusion effects were not significant.

Conclusions:

• The 3D cell culture in an in vitro pulp chamber is a substantial improvement for simulating in vivo conditions.
• This model accurately reflects that zinc oxide-eugenol is non-toxic, unlike some simpler assays.
• The system demonstrates sensitivity in detecting cytotoxic effects of dental materials.