Purpose: This study was designed to evaluate the postoperative pain and periapical healing after single and two visits endodontic treatment using twisted file adaptive “TF Adaptive" Ni-Ti rotary system. Subjects and Methods: Twenty patients requiring endodontic treatment for necrotic single rooted teeth with periapical lesion were enrolled in this study. The selected patients were divided into two groups (10 patients each) according to the number of visits; Group І: single visit endodontic treatment and Group ІІ: two visits endodontic treatment. The root canals were prepared using the TF Adaptive system. In group I the obturation was done by modified single-cone technique in a single visit, while in group II the obturation was done in the second visit. Evaluation of postoperative pain at 24, 48 and 72 hours after obturation and periapical healing after 6 and 12 months was done. Results: There was no statistical significant difference between the two groups either in postoperative pain or in the periapical healing.
Conclusion: Single visit and two visits endodontic treatment protocols were comparable regarding the incidence of postoperative pain and periapical healing