Purpose: to determine the immediate treatment result and incidence of flare-ups after retreatment of teeth with resorcinol-formaldehyde (RF) resin fillings.
N= 58 cases of retreatment of root filled with RF resin material
•Records of 34 patients with 58 teeth that were filled with RF and retreated in a postgraduate endodontic clinic were reviewed.
•Reason for retreatment (symptoms versus restorative) and occurrence of flare-ups (pain or swelling requiring an emergency visit) and the periapical status before retreatment were recorded.
•Radiographs were taken for initial (resin obturations) and posttreatment (gutta-percha obturations) evaluations were used.
•Before & after retreatment, the length of obturated canal was measured by starting at the coronal orifice and measuring to the apical-most extent of the filling. The length of unobturated canal(s) was measured from the apical-most extent of the filling to a point 1-mm from the radiographic apex of the root. The % of the filled canal space was calculated.
•After retreatment quality of obturation was rated as optimal if 100% of the canals were filled, improved if the percentage of canals filled was increased by at least 10%, unchanged if the increase in percentage of canals filled was <10%, and worse if an iatrogenic perforation or separated instrument occurred.
Most highlighted Results:
- 48% of the total canal space was filled before retreatment; 90% was filled after retreatment.
- After retreatment, obturations were rated as optimal in 59%, improved in 33%, unchanged in 6%, and worse in 2%.
- 12% had post-retreatment flare-ups.
- No statistical relations was found between the incidence of flare-ups and the quality of obturation before or after retreatment (in terms of length) or the presence of symptoms or PA lesions before retreatment.
Studies with larger sample size are needed to determine the variables related to flare up.