ABSTRACT
AIMS:
The endodontic
literature reports a lot of
comparative study on endodontic instruments, concerning as well their geometry, instrumental dynamics, material, mechanical
behavior or
heat treatment. However, to our
knowledge, no study has focused on the influence of endodontic motors on the shaping
abilities of endodontic instruments. Thus, the aim of this study was to analyze the influence of the endodontic motors on
root canal shaping instruments.
METHOD:
Dual Move (MICRO-MEGA, Besançon,
France), Canal Pro CL2i (COLTENE, Alstätten, Suisse), Canal Pro Jeni Motor (COLTENE, Alstätten, Suisse), Ai Motor (WOODPECKER, Guilin,
China),
Wave One motor (VDW, Postfach, Munich) and Smart A (WOODPECKER, Guilin,
China) were pre-clinically compared in continuous
rotation and reciprocating
motion on a
traction/compression bench using resin blocks. Canal shaping in continuous
rotation and reciprocating
motion were performed with One Curve and One RECI instruments (MICRO-MEGA, Besançon,
France), respectively. The penetration/removal forces, making it possible to objectify the cutting effect and screwing effect of the instruments during
root canal shaping, were analyzed.
RESULTS:
The results showed (i) that endodontic motors influence the mechanical
behavior of endodontic instruments, (ii) that the influence of the motors is essentially felt during reciprocating
motion and (iii) that the reciprocating angles influence the mechanical
behavior of endodontic instruments.
CONCLUSION:
Only endodontic instruments are widely studied in
literature while endodontic motors have a direct influence on
root canal treatment. This study analyzes the influence of the endodontic motors on
root canal shaping instruments. This study tends to demonstrate that Jeni Motor could optimize the mechanical
behavior of endodontic instruments.