K2M's MESA Platform Technology features top-loading and low-profile screws and Zero-Torque Technology that one-step locks without applying
torsional stress to the spine.
Because of the rising
torsional stress with rising thread coefficient of friction, the axial breaking force of the screw is reduced, which also means a reduced critical length of thread engagement.
During cyclic torsional shear testing, cyclic
torsional stress amplitude is increased with each prescribed number of cycles to obtain the strain-dependent shear modulus and damping values.
When the bar was twisted to the predetermined angle, the clamp was suddenly released, and then, the
torsional stress wave was instantly generated.
In present study, constant
torsional stress was applied repetitively to simulate repeated locking or autoreverse motion of the rotary file during canal preparation.
Cerit, <<Numerical investigation on
torsional stress concentration factor at the semi elliptical corrosion pit,>> Corrosion Science, pp.
The spheroidal graphite distribution wholly or partially on matrix depends on type of component application like axial stress, bending stress, reverse bending stress or
torsional stress determines the life of component.
Berzins, "An in vitro comparison of
torsional stress properties of three different rotary nickel-titanium files with a similar cross-sectional design," Journal of Endodontics, vol.
Unless very well damped, this "interference" with a natural frequency can lead to high torsional vibration, high cyclic
torsional stress and fatigue failure.
The pretensioner applies an always reproducible, defined tensile load to the screw shafts, but no longer any
torsional stress. It is said to be easy to operate.
The new pre-tensioner applies a reproducible, defined tensile load to the screw shafts, but no
torsional stress. The device is said to be easy to operate: The operator selects the correct pressure from the machine documentation and clamps the screw outside the extruder in the pre-tensioning device.
In so doing, the
torsional stress was probably exponentially greater.