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Related Concept Videos

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Laboratory simulation of longitudinally cracked teeth using the step-stress cyclic loading method.

F Lin1,2, R Ordinola-Zapata3, H Xu4

  • 1Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing, China.

International Endodontic Journal
|April 14, 2021
PubMed
Summary

Cyclic mechanical fatigue successfully simulated longitudinal cracking in root-filled premolar teeth. This step-stress cyclic loading method offers a more clinically relevant approach for studying cracked teeth in laboratory settings.

Keywords:
cracked toothcyclic loadinglongitudinal fracturestatic loading

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Area of Science:

  • Dental materials science
  • Biomechanical engineering
  • Restorative dentistry

Background:

  • Root-filled teeth are susceptible to fracture.
  • Simulating longitudinal cracking in a laboratory setting is crucial for understanding failure mechanisms.
  • Previous methods may not accurately represent clinical conditions.

Purpose of the Study:

  • To simulate longitudinal cracking in root-filled premolar teeth using cyclic mechanical fatigue.
  • To compare the effectiveness of static versus step-stress cyclic loading in inducing fractures.
  • To establish a more clinically representative laboratory model for cracked teeth.

Main Methods:

  • Mesial-occlusal-distal (MOD) cavities were prepared in twenty root-filled mandibular premolars restored with fiber posts and resin composites.
  • Samples were divided into static loading and step-stress cyclic loading groups.
  • Loads and cycles to failure were recorded; Micro-CT analyzed fracture modes.

Main Results:

  • No significant difference in mean fracture loads between static (769 N) and cyclic (720 N) loading groups (P > 0.05).
  • Cyclic loading resulted in 50% longitudinal, 20% cuspal, and 30% mixed-mode fractures.
  • Longitudinal fractures under cyclic loading occurred at higher cycle numbers and average loads per cycle.

Conclusions:

  • Step-stress cyclic loading successfully produced longitudinally cracked, root-filled premolar teeth.
  • This method provides a more clinically representative simulation of cracked teeth compared to static loading.
  • The findings support the use of cyclic loading for future research on cracked tooth syndrome.