1. Retreatment of endodontic failures;Bergenholtz;Scand J Dent Res,1979
2. Endodontic retreatment;Lovdahl;Dent Clin North Am,1992
3. The dependence of the results of pulp therapy on certain factors: an analytical study based on radiographic and clinical follow-up examination;Strindberg;Acta Odont Scand,1956
4. The prognosis of pulp and root canal therapy: a clinical and radiographic follow-up examination;Grahnen;Odontol Revy,1961
5. Correlation of positive cultures with the prognosis for root canal treatment;Engström;Odontol Revy,1964