“…Differences between the success and failure rates with RP and CS was analyzed by c 2 test. Baseline material 67 100 89 100 67 100 89 100 134 100 178 100 Root fracture 1 1 1 1 2 3 2 2 3 2 3 2 Patient could not be located 3 4 5 6 0 0 0 0 3 3 5 3 Inconclusive radiographs 3 4 6 7 3 4 6 7 6 7 12 7 Final material 60 90 77 87 62 93 81 91 122 91 158 89 Several factors have been suggested to influence the prognosis of a retrograde root filling: periodontal status [13,27,33], quality of the conventional endodontic treatment [7,13,17], tooth type [19,29], size of the periapical radiolucency [13,19,21,27], clinical symptoms [16], and quality of the coronal restoration [2]. In our material there were no significant differences between the two groups on any of the parameters recorded before surgery.…”