To review literature describing the materials and techniques used with RF endodontic therapy and to
discuss clinical considerations when evaluating and retreating RF cases.
Components of Resorcinol-Formaldehyde Resin
•It contains 2 potentially toxic components, formaldehyde (liquid) and resorcinol (powder). Zinc oxide or barium sulfate may be used for radiopacity
•When 10% sodium hydroxide is added to the mixture, polymerization occurs, which can form a brick-hard red material that has no known solvent
Clinical Use of Resorcinol-Formaldehyde Resin in Endodontics •Advantages of this technique: no need for complete pulp tissue removal and antibacterial additives
•Contraindications: treating anterior teeth because of the staining that occurs with RF fillings and immature teeth because of the potential interference with root development
•When a pulp exposure occurs ➔ an arsenic paste placed on the exposed pulp and sealed for 1 to 2 days
•Canals are frequently not instrumented or obturated to their full length •The canals are rinsed with antiseptic solutions and chelating agents
•The canals are dried with ether, and antibiotics placed into the pulp chamber to control infection
•The liquid mixture of RF resin is placed in pulp chamber and into the canals with an instrument, file, spreader, paper points; then polymerization continues and the material becomes a solid.
By better understanding the formaldehyde-resorcinol materials and methods, dentists can make appropriate treatment-planning decisions for patients that present with this root canal treatment. If retreatment is indicated.