A histopathological study of direct pulp capping with adhesive resins

Area of Science:

• Dental Materials Science
• Biomaterials Research
• Regenerative Endodontics

Background:

• Direct pulp capping aims to preserve pulp vitality using adhesive materials.
• Evaluating histological responses to resin-based materials is crucial for clinical success.
• Microleakage and inflammatory responses are key indicators of material biocompatibility.

Purpose of the Study:

• To compare the histological pulp responses to four different adhesive resin systems after direct pulp capping.
• To correlate gap formation and microleakage with pulpal reactions.
• To assess the potential of these materials for direct pulp capping applications.

Main Methods:

• Mechanical pulp exposures were created in Wistar rat molars.
• Cavities were restored with four adhesive resin systems: Superbond C&B, Clearfil Liner Bond, Tokuso Light Bond, and Scotchbond Multi-Purpose One All.
• Histological evaluation of pulp tissue was performed at 3, 7, 30, and 90 days post-operation.

Main Results:

• Superbond C&B demonstrated minimal pulpal reaction and secondary dentin formation with no microleakage.
• Clearfil Liner Bond showed slight reaction, some necrosis, and secondary dentin at 90 days with minimal microleakage.
• Tokuso Light Bond and One All induced severe pulpal reactions and extensive microleakage without secondary dentin formation.
• Microleakage significantly correlated with adverse histopathological findings.

Conclusions:

• Adhesive resin systems exhibit varying degrees of biocompatibility for direct pulp capping.
• Superbond C&B and Clearfil Liner Bond show promising results, while Tokuso Light Bond and One All are associated with severe pulpal damage.
• Further in vivo studies are needed to confirm clinical efficacy and long-term safety of these materials for direct pulp capping.