During the clinical use of rotary NiTi instruments, the files rotate at speeds much faster than 2 rpm with auto-reverse mode and the files undergo repetitive locking and unlocking by the autoreverse motion at a prefixed level of torque.
Therefore, the torsional resistance and the fracture modes of various NiTi instruments were compared using the dynamic repetitive torsional loading method incorporating the autoreverse motion and their fractured specimens were compared with the specimens from single continuous rotation test method.
On the other hand, the autoreverse motion by the endodontic motor may create repetitive loading and unloading due to a certain condition from the root canal or operator.
The first was the apical accuracy during the autoreverse function ("ARL"), and the second was only the apical accuracy during the EAL function ("EL").
These indicators are used to set the level at which the autoreverse motion should begin in ARL mode and also to detect the position of the root canal instrument in EAL mode.
Within the limitations of the present study, the ARL function alone of the Tri Auto ZX gave acceptable results in all groups and the EAL function gave acceptable results in some groups when the device was set at 0.5 as the autoreverse apical limit.
To supplement its impressive safety features the 300C boasts a Chrysler Group safety 'first' of onetouch close of power windows and sunroofs that includes a new, autoreverse
sensing system which automatically engages and reverses the window to help prevent injuries, especially to children.
cassette deck has a horizontal drawer-loading mechanism that is much more elegant than the flop-out doors common even on separates, and which Denon claims minimizes vibration.