Background: Endodontically treated teeth lose a large proportion of their structure due to trauma and caries and during endodontic treatment. As a result, they have low physical properties, fracture resistance, and esthetic appearance. The study aims to evaluate the anti-oxidant efficacy of sodium thiosulphate, citric acid and gallic acid on the recovery of shear bond strength to pulp chamber dentin treated with NaOCI & EDTA. Methodology: 50 single rooted second premolars were divided into 5 groups (n=10); Positive control received no treatment; negative control received only irrigation treatment, while the other two experimental groups were treated with their respective anti-oxidant following the irrigation. All the samples were then cured with composite and subjected to SBS test under a universal testing machine. Statistical analysis: ANOVA & Post hoc tukey were used with P <0.5. Results: Anti-oxidant groups showed a greater mean SBS value than the negative control, comparable to positive control. The sodium thiosulfate group showed the highest value with a significant difference from the negative control group. Conclusion: Both the anti-oxidants used were able to restore the Shear bond strength of pulp chamber dentin altered due to endodontic irrigants. Hence, possesses great potential in its clinical implication.

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Aim- To evaluate the removal of gutta percha by hand file system, rotary file system and reciprocating file system from root canals by using CBCT. Materials and Method: Root canals of 42 extracted human mandibular premolars  were prepared using the ProTaper Universal rotary system and then obturated. Root filling quality was confirmed on CBCT images. Specimens were divided into 3 groups (n = 14) according to the system used for filling removal, group 1: H File, group 2: MTwo rotary retreatment file, and group 3:WaveOne file. Each specimen was sent for CBCT Analysis. Statistical Analysis Used: Evaluation of data was done statistically using One-way Analysis of Variance and Tukey’s post hoc test. Results: There was statistical difference in all the groups (P>0.05). All systems demonstrated presence of remnants of filling material. Mean reduction in the volume of GP after retreatment of Group I was 0.006mm3, Group II was 0.002mm3 Group III was 0.003mm3. Conclusion: The system responsible for a better removal of root canal filling material was the MTwo Retreatment file system, followed by the WaveOne system and H File.

Aim- To evaluate the removal of gutta percha by hand file system, rotary file system and reciprocating file system from root canals by using CBCT. Materials and Method: Root canals of 42 extracted human mandibular premolars were prepared using the ProTaper Universal rotary system and then obturated. Root filling quality was confirmed on CBCT images. Specimens were divided into 3 groups (n = 14) according to the system used for filling removal, group 1: H File, group 2: MTwo rotary retreatment file, and group 3: WaveOne file. Each specimen was sent for CBCT Analysis. Statistical Analysis Used: Evaluation of data was done statistically using One-way Analysis of Variance and Tukey’s post hoc test. Results: There was statistical difference in all the groups (P>0.05). All systems demonstrated presence of remnants of filling material. Mean reduction in the volume of GP after retreatment of Group I was 0.006mm3, Group II was 0.002mm3 Group III was 0.003mm3. Conclusion: The system responsible for a better removal of root canal filling material was the MTwo Retreatment file system, followed by the WaveOne system and H File.