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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Time dependent deformation behavior of dentin.

C Montoya1, D Arola2, E A Ossa1

  • 1School of Engineering, Universidad Eafit, Medellín, Colombia.

Archives of Oral Biology
|January 14, 2017
PubMed
Summary
This summary is machine-generated.

Coronal dentin exhibits spatially varying viscoelastic behavior, crucial for oral functions and fracture resistance. Its time-dependent deformation increases closer to the pulp due to changes in composition and microstructure.

Keywords:
CreepDentinLumen area fractionMineral-to-collagen ratioSpherical indentation

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Area of Science:

  • Biomaterials Science
  • Dental Mechanics
  • Tissue Engineering

Background:

  • The viscoelastic properties of dentin are vital for oral functions and fracture resistance.
  • Spatial variations in dentin's crown microstructure may influence its viscous behavior.
  • A detailed, spatially resolved description of coronal dentin's viscoelasticity is lacking.

Purpose of the Study:

  • To investigate the spatially resolved viscoelastic behavior of coronal dentin.
  • To develop a quantitative model for time-dependent deformation in coronal dentin.
  • To correlate dentin's composition and microstructure with its viscoelastic response.

Main Methods:

  • Spherical indentations were performed on three distinct regions of coronal dentin: outer, middle, and inner.
  • Power law relationships were established to quantitatively characterize the stress-strain responses.
  • Microstructural analysis focused on tubule density and mineral-to-collagen ratios.

Main Results:

  • Dentin's deformation behavior is significantly influenced by its composition (mineral-to-collagen ratio) and microstructure (tubule density).
  • The rate of viscous deformation increases as dentin gets closer to the pulp.
  • Spatial variations in these properties directly impact the time-dependent mechanical response.

Conclusions:

  • A model was successfully developed to describe the steady-state, time-dependent deformation of coronal dentin.
  • The model effectively accounts for spatial variations in dentin's composition and microstructure.
  • Experimental results showed good agreement with the predictions of the developed model.