Aim: To evaluate the efficiency of removal of root canal filling material with ProTaper Universal Rotary Retreatment files (PTR) combined with solvents and the influence of solvents on the bond strength of AH Plus sealer to intraradicular dentin after canal reobturation.
Materials and Methods: Sixty mandibular premolars were employed in the study. Samples were endodontically treated using AH Plus sealer. Teeth were divided into four equal groups(n=15) according to the use and type of different gutta-percha solvents during retreatment;(Group A) PTR, (Group B) PTR& Chloroform, (Group C) PTR& Orange oil and (Group D) :PTR& Endosolv. After retreatment, the teeth were reobturated and sectioned in 1-mm-thick dentin slices that were subjected to the push-out test. Repeated measures ANOVA test was used to study the effect of solvent, root level and their interactions on push-out bond strength. Bonferroni's post-hoc test was used for pair-wise comparisons when ANOVA test is significant.
Results: PTR group showed the highest statistically significantly mean push-out bond strength values. PTR &Orange oil group showed statistically significantly lower mean push-out bond strength followed by PTR & Endosolv group. While, PTR &Chloroform group showed the lowest statistically significantly mean push-out bond strength.
Conclusion: The use of gutta-perch solvents had a negative impact on the bond strength values of AH Plus sealer to root canal dentin.