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Three-Dimensional Analysis of Strain

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...

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Related Experiment Video

Updated: Sep 29, 2025

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens

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Published on: January 24, 2016

A Preliminary In Vitro Study of 3D Full-Field Strain Distribution in Human Whole Premolars Using Digital Image

Qing Liu^1,2,3, Qianqian Dong^1,2,3, Yifeng Wen^1,2,3

¹Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, China.

Materials (Basel, Switzerland)

|March 25, 2022

Summary

Full-field measurements using digital image correlation (DIC) revealed distinct strain patterns in human premolars under load. These findings offer insights into tooth mechanics and potential causes of non-carious cervical lesions.

Keywords:

buccal surface strain digital image correlation full-field measurement human premolars

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Published on: May 30, 2019

Area of Science:

Biomaterials Science
Dental Biomechanics
Experimental Mechanics

Background:

Understanding human tooth behavior under load is crucial for dental research.
Previous studies often lacked comprehensive, full-field strain data.
Digital Image Correlation (DIC) offers a method for detailed surface strain analysis.

Purpose of the Study:

To measure and analyze full-field buccal surface strains on human premolars using DIC.
To investigate strain distribution differences between the crown and root.
To explore the role of strain patterns in non-carious cervical lesions (NCCLs) and root fractures.

Main Methods:

In vitro experiments were conducted on caries-free and abrasion-free human premolars.
Digital Image Correlation (DIC) was employed to capture full-field buccal surface strains.
Statistical analysis was performed to compare strain distributions (p < 0.001).

Main Results:

Distinct strain value and orientation fields were observed, providing rich biomechanical information.
Significant differences in strain distribution were found between the crown and root.
A 'watershed' phenomenon at the cementoenamel junction (CEJ) separated strain orientation fields and was observed in value fields.
Minor strains increased linearly from cervical to apical regions in the root cementum.
Strain orientation changes and magnitude were linked to NCCL mechanisms.
Occlusal forces were supported as a contributing factor to root fractures.

Conclusions:

DIC provides comprehensive full-field strain data for human teeth.
The cementoenamel junction (CEJ) acts as a critical interface influencing strain patterns.
Strain characteristics at the CEJ and root may explain NCCL development and root fracture susceptibility.