Torsional profiles of new and used revo-s rotary instruments: an in vitro study.
Dr. Ove A. Peters: 0000-0001-5222-8718
Journal of Endodontics
INTRODUCTION: This study investigated the torsional properties of new and used Revo-S Shaping Universal (SU) endodontic instruments.
METHODS: Torsional profiles were established following the American National Standards Institute/American Dental Association Specification No. 28. Unused SU instruments (group 1, control; n = 30) and instruments used in simulated root canals twice (group 2, n = 30) or six times (group 3, n = 30) were tested. Analysis of variance with the Bonferroni/Dunn post hoc test (α = 0.05) was used to analyze the torque and angle of rotation at fracture.
RESULTS: The maximum torque at fracture did not differ significantly among instruments in group 1 and groups 2 and 3. The angle of rotation at fracture decreased significantly (P < .01) from group 1 to groups 2 and 3.
CONCLUSIONS: The repeated use of the SU rotary instruments significantly reduced the angle of rotation at fracture but did not reduce the torque at fracture.
Peters, O. A.
Torsional profiles of new and used revo-s rotary instruments: an in vitro study..
Journal of Endodontics, 37(7), 989–992.