does the working length change when using the xp-endo shaper file at different operating temperatures?

Introduction: this study was directed to evaluate the effect of different operating temperatures on the change in working length when using the xp-endo shaper file. methods: a total of 20 plastic blocks with16 mm curved canals were used in this study. the working length was adjusted to be 15 mm using a customized teflon stopper (10mm in length) which was used with all files in the study. the preparation was done using the xp-endo shaper file (fkg, la chaux-de-fonds, switzerland) according to the manufacturer’s instructions. the blocks were divided into 2 groups: group 1: body temperature, group 2: room temperature. pre and post instrumentation imaging of the blocks was done using the stereomicroscopy at 8x. the images were superimposed to create a composite image on which the evaluation of working length change was done. mann-whitney u test was used to compare the change in working length in the two groups. results: there was no statistically significant difference between the two groups (p ≤ 0.05). conclusions: within the parameters of this study, although both groups showed an increase in working length when using the xp-endo shaper file, the operating temperature did not have an effect.