The goal of the study was to evaluate the influences of overfilled root canal materials. The study shows a comparative evaluation of patients with extruded root material in bone. Patients required endodontic surgery were divided into groups: 1st group - patients with inadequately obturated and overfilled, 2nd group - patients with adequately obturated but overfilled, 3rd group patients with inadequately obturated and filled till the root apex. We checked the dates of previously done endodontic treatment, primary diagnosis, root canal obturation quality, which material had been used, localization of pathology, the presence of pain or discomfort, a need of taking painkillers. Results. Root canal obturation material was overfilled in maxilla in 66.2% cases in group 1 and in 69% in group 2. And in mandible in 33.8% cases in group 1 and 31% in group 2. No significant difference of overfilling material volumed showed in group 1 and group 2. More complains about painful sensations were seen in group 1 and 2, rather than in group 3. A need for painkillers in all groups was around the same: 35.3% for group 1, 33.3% for group 2, and 35.5% for group 3.1-year post-treatment results showed favorable outcome in 75.2 % for group 1, 97.6 % for group 2, 88.7% for group 3.