Retrograde root filling with composite and a dentin-bonding agent. 1

Area of Science:

• Endodontics
• Dental Materials Science
• Restorative Dentistry

Background:

• Retrograde root filling is a critical procedure in endodontic surgery.
• Existing materials and techniques may have limitations in achieving a durable seal and biocompatibility.

Purpose of the Study:

• To describe and evaluate a novel retrograde root filling method using a chemically curable composite resin (Retroplast).
• To assess the bond strength, seal quality, and tissue response to Retroplast in retrograde fillings.

Main Methods:

• A specific cavity preparation in the apical root was performed.
• The cavity was treated with a bonding agent (Gluma) followed by Retroplast application.
• Bond strength was tested, and seal quality was evaluated using light microscopy and SEM.
• Histological analysis of periapical tissues in animal models was conducted.

Main Results:

• Retroplast demonstrated a tight seal with apical dentin, unaffected by eugenol-based sealers.
• Microscopy confirmed excellent adaptation of the composite to the cavity surface.
• Histology in animal studies showed no inflammatory response and good tissue integration, with cementum and Sharpey's fibers formation.
• Successful clinical outcomes were observed in humans, with failures mainly due to hemostasis issues or undetected root fractures.

Conclusions:

• The described retrograde filling technique using Retroplast offers a viable new treatment principle for endodontic surgery.
• The material exhibits favorable biocompatibility and promotes effective periapical tissue regeneration.
• Proper surgical technique, including hemostasis, is crucial for optimal clinical success.