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Related Concept Videos

Torsional Pendulum01:09

Torsional Pendulum

A torsional pendulum involves the oscillation of a rigid body in which the restoring force is provided by the torsion in the string from which the rigid body is suspended. Ideally, the string should be massless; practically, its mass is much smaller than the rigid body's mass and is neglected.
As long as the rigid body's angular displacement is small, its oscillation can be modeled as a linear angular oscillation. The amplitude of the oscillation is an angle. The role of mass is played by the...
Bending and Torsional Moments01:20

Bending and Torsional Moments

Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
Torsion of Noncircular Members01:16

Torsion of Noncircular Members

Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
Unsymmetric Bending - Angle of Neutral Axis01:15

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Angle of Twist: Problem Solving

An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...

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Method to Measure Tone of Axial and Proximal Muscle
10:41

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Published on: December 14, 2011

Torsional properties of pathfinding instruments.

Hélio P Lopes1, Carlos N Elias, Giorgiana Amaral

  • 1Department of Endodontics, Faculty of Dentistry, Estácio de Sá University, Rio de Janeiro, RJ, Brazil.

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics
|August 12, 2011
PubMed
Summary
This summary is machine-generated.

Conventional K-type files demonstrated superior torsional properties compared to C-Pilot and C(+) endodontic pathfinding instruments, offering a greater safety margin during root canal procedures.

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Area of Science:

  • Endodontics
  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Comparison of stainless steel endodontic pathfinding instruments: C-Pilot and C(+) files.
  • Conventional K-type instruments (KCC(+)) served as controls.

Purpose of the Study:

  • To evaluate and compare the torsional properties of C-Pilot and C(+) endodontic instruments.
  • To assess the safety factors of pathfinding instruments based on torsional behavior.

Main Methods:

  • Torsional assay conducted on size 10 files in clockwise rotation.
  • Evaluation of maximum torque and angular deflection at failure.
  • Scanning electron microscopy (SEM) analysis of fractured surfaces and shafts.

Main Results:

  • Angular deflection to fracture: KCC(+) > C-Pilot > C(+).
  • Maximum torque values: C(+) > KCC(+) > C-Pilot.
  • SEM revealed ductile fracture surfaces and plastic deformation.

Conclusions:

  • Endodontic instruments exhibit varied torsional behavior based on evaluated parameters.
  • Conventional K files offer superior angular deflection, indicating a better safety factor for pathfinding.
  • C-Pilot and C(+) files showed lower angular deflection compared to conventional K files.