Aim of the study was To Compare the efficiency of R
ProTaper and R-Endo retreatment files in the removal of
conventional gutta-percha and resin coated gutta-percha and
time required. 60 extracted single root premolars were selected,
and then divi
ded into two groups according to the obturation
material. Next, each group was divided into two groups
according to the methods of retreatment.
