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Cyclic fatigue of Profile rotary instruments after simulated clinical use
Author(s) -
Yared G. M.,
Dagher F. E. Bou,
Machtou P.
Publication year - 1999
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1046/j.1365-2591.1999.00201.x
Subject(s) - breakage , sterilization (economics) , dentistry , dry heat , dental instruments , cyclic stress , analysis of variance , materials science , orthodontics , medicine , mathematics , statistics , metallurgy , composite material , monetary economics , economics , foreign exchange market , foreign exchange
Aim The purpose of this study was to evaluate cyclic fatigue of Profile Ni–Ti rotary instruments (PRIs) after dry heat sterilization and up to 10 times simulated clinical use. Methodology Instruments of size 40–15 were used in a crown‐down technique. Three groups were included in this study. In groups 1 and 2, each set of instruments was used in five and 10 canals, respectively. Group 3 was the control group. NaOCl at a concentration of 2.5% was used as an irrigant. Each set of instruments was sterilized before each use. Results The PRI size 40 demonstrated the lowest incidence of rotations to breakage. One‐way analysis of variance and Tukey’s HSD test showed statistically significant differences among different file sizes within each group. Conclusions The results showed that dry heat sterilization and simulated clinical use in the presence of NaOCl did not lead to a decrease in the number of rotations to breakage of the files.