| Summary: | The aim of the study is to measure and compare strain generated on root dentine surface by two
different instrumentation motions. Thirty extracted single canal premolars were used in this study
which randomly was divided into two groups, one group was prepared with ProTaper NEXT X2 file in
rotation motion, and the second group was prepared by WaveOne GOLD primary file in reciprocation
motion, the canals were irrigated during canal preparation by 2 ml of sodium hypochlorite and 17%
EDTA gel was used. Strain measurement was performed by strain gauges and a digital strain output
reader, data were recorded every 5 s for 50 s. The results of this study have shown that WaveOne
GOLD had higher mean 0.7308±0.41106 than ProTaper next 0.5385±0.39904 which means
WaveOne GOLD generates greater strain than ProTaper NEXT. However, according to Student’s
t-test between two groups there is no statistical difference between them. Based on the results of
this study, there was no difference between the two motions; both motions generated strain on
root dentine surface
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