Comparison of Dentinal Defects Induced by Rotary, Reciprocating, and Hand Files in Oval Shaped Root Canal - An In-Vitro Study.

AIM: To evaluate and compare the formation of dentinal defects using hand Hedstrom files, XP-Shaper, TruNatomy, and Reciproc Blue file systems when used for oval shaped root canals. MATERIALS AND METHODS: One hundred and five extracted human mandibular premolars with single root and oval canals were selected for the study. Twenty-one teeth were unprepared (control), and the remaining teeth were divided into the prepared groups (n = 21), that is, Group H-Files, Group XP-Shaper, Group TruNatomy, and Group Reciproc Blue. All selected teeth were de-coronated perpendicular to the long axis of the tooth by using a diamond-coated disk with water cooling, leaving root segments approximately 16 mm in length. Each group was prepared according to the above file system. Then all roots were sectioned perpendicular to their long axes at 3, 6, and 9 mm from the apex using a diamond-coated disk under a continuous water stream. Each specimen was then checked for the presence of dentinal defects/microcracks. RESULT: The XP-Endo shaper group had the lowest number of defects (01/21 roots) 4.7%; TN (04/21) 19%, H-Files (04/21) 19%, and RC Blue (05/21) 23.8% had the highest incidence of defects. However, no significant difference was detected among these groups (P > 0.05). CONCLUSION: The motor-driven root canal instrumentation with rotary and reciprocating files and hand files may create microcracks in the radicular dentine, whereas the XP-Shaper file system produces minimal or less cracks compared to other tested rotary file systems and H-file instrumentation.

Outcome of partial pulpotomy verses full pulpotomy using biodentine in vital mature permanent molar with clinical symptoms indicative of irreversible pulpitis: A randomized clinical trial.

Aim: The aim of the study is to evaluate and compare the clinical and radiographic outcome of partial pulpotomy and full pulpotomy in mature permanent molars with symptomatic irreversible pulpitis using biodentine. Materials and Methods: A total of 66 vital mature permanent molars with irreversible pulpitis were randomly allocated to a partial pulpotomy (n = 33) and full pulpotomy group (n = 33). Biodentine was used as a pulp capping material which was covered with resin-modified glass ionomer cement (RMGIC) followed by composite restoration. Clinical and radiographic evaluation was done at 3, 6, and 12 months follow-up for tenderness, periapical radiolucency, dentine bridge formation, and root canal calcification. Data from the study were analyzed using a Friedman and Mann-Whitney test and the success rate was analyzed by Chi-square value. Result: No statistically significant difference was found between partial and full pulpotomy (P > 0.05) and the success rate was 80.7% and 92.8%, respectively, at 12 months follow-up period. Conclusion: Both partial and full pulpotomy can be used as a permanent treatment modality in symptomatic irreversible pulpitis of vital mature permanent molars.

Comparative evaluation of retreatability of bioceramic sealer (BioRoot RCS) and epoxy resin (AH Plus) sealer with two different retreatment files: An in vitro study.

AIM: The aim of the study was to evaluate and compare the retreatability of BioRoot RCS and AH Plus sealer with two different retreatment file systems using cone-beam computed tomography (CBCT) for assessing the filling remnants. MATERIALS AND METHODS: A total of sixty mandibular premolars with single and oval root canals were prepared till size F3 and obturated with GP/AH Plus (Group 1) and GP/BioRoot RCS (Group 2). Canals were then retreated using two different retreatment file systems - ProTaper Universal Retreatment (PTUR) system and NeoEndo Retreatment system. The ability to re-establish working length (WL) and apical patency was recorded, and the percentage volume of residual filling material was evaluated using CBCT at the coronal, middle, and apical thirds. Data from the study were analyzed using one-way analysis of variance with Pearson's Chi-squared analysis and the Kruskal-Wallis test. RESULTS: No statistically significant difference was found in the amount of residual sealer (AH Plus and BioRoot RCS) after retreatment throughout the whole study (P > 0.05) at various root canal levels. Furthermore, the BioRoot RCS group retreated with the PTUR system showed a higher frequency of failure in re-establishing WL and regaining apical patency than the other groups. CONCLUSION: Complete removal of root canal sealers could not be achieved regardless of the type of sealer used and the retreatment technique employed. Furthermore, in clinical settings, the retreatability of novel BioRoot RCS may be deemed feasible.