Biocompatibility of resin-based materials used as pulp-capping agents

Area of Science:

• Dental materials science
• Biomaterials research
• Regenerative dentistry

Background:

• Pulp capping aims to preserve pulp vitality and promote healing.
• Resin-based materials are increasingly used as pulp capping agents.
• Evaluating the biological response to new materials is crucial for clinical application.

Purpose of the Study:

• To compare the pulpal response to resin-modified glass-ionomer cement (RMGIC) and a self-etching adhesive system.
• To assess the efficacy of these materials as direct pulp capping agents in a rat model.
• To evaluate dentine bridge formation and pulpal tissue healing.

Main Methods:

• Class I cavities were prepared in rat molars with pulp exposure.
• Materials tested: Clearfil Liner Bond 2V (CLB 2V), Vitrebond (VIT), and calcium hydroxide (CH) as control.
• Histological evaluation of pulpal tissues at 7, 30, and 60 days post-treatment.

Main Results:

• All tested materials induced an initial inflammatory response.
• Both RMGIC and self-etching adhesive systems facilitated pulpal healing with calcified barrier formation by 60 days.
• Vitrebond showed a larger zone of fibrodentine deposition compared to Clearfil Liner Bond 2V.
• Tertiary dentine was deposited beneath the fibrodentine matrix.

Conclusions:

• Resin-based pulp capping agents, including RMGIC and self-etching adhesives, support pulpal healing.
• These materials promote the formation of cell-rich fibrodentine and tertiary dentine.
• Calcified barrier formation indicates successful pulp repair and preservation of vitality.