The prevalence of post-obturation pain was high (40.2%). The important prognostic determinants of post-obturation pain were female, molar tooth, size of periapical lesion smaller than 3 mm, history of post-preparation pain or generalized swelling and single-visit treatment.

The knowledge of the pulp anatomy plays an important role in the success of endodontic treatments. Mandibular molars have been reported with complex configuration canal anatomical, making them one of the most difficult teeth to manage endodontically. The aim of this study was to examine the root canal morphology of mandibular molars using tube shift technique. This study was descriptive with cross sectional approach. A total of 40 patients of each 40 left and right on first and second molars were samples for this study. We used x-rays with tube shift technique to analyzed canal configuration. The number of canal configuration in each root based on Vertucci's classification was observed. Results showed root canal configuration of permanent first molars on mesial root right region, type I (12.5%), II (22.5%), III (5%), IV (57.5%), another type 3-2 (2.5%), and left region type I (5%), II (37.5%), IV (52.5%), V (2.5%), another type 3-2 (2.5%), and on distal root right region, type I (87.5%), III (5%), IV (2.5%), V (5%) and left region type I (90%), II (5%), III (2.5%), V (2.5%). Molars root canal configuration of permanent second molars on mesial root right region, type I (52.5%), II (35%), IV (12.5%), and left region type I (57.5%), II (22.5%), III (2.5%), IV (12.5%), V (5%), and on distal root right region type I (92.5%), II (5%), V (2.5%) and left region type I (87.5%), II (5%), IV (2.5%), V (5%). Mandibular permanent first and second molars based on Vertucci classification, both mesial and distal roots have found type I, II, III, IV, V, but on mesial roots permanent mandibular first molars have found another types 3-2.

The prevalence of postpreparation pain was high, and the important prognostic determinants were presence of preoperative pain, tooth type, systemic steroid therapy and preoperative swelling.

It is concluded that the agreement between the two radiographic examiners and the agreement between either radiographic examiner and the clearing technique were poor to moderate, indicating the limited value of radiographs alone when studying certain aspects of the root-canal system.