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Dr. Robert KusyDr. Alan R. Greenberg

Elastic Properties of Orthodontic Wires

This study uses a series of formulae to compare different metal wires with regards to Elasticity

This journal is a comparative study on the Elastic Property of the following wires:

1. Stainless Steel (S.S.)2. Cobalt-Chromium (Co-

Cr)3. Nickel-Titanium (Ni-Ti)4. Beta-Titanium (B-Ti)

Journal Summary


Elastic Property Ratios

Three Basic Elastic Properties

1. Strength2. Stiffness3. Range

Stress States1. Bending2. Torsion


General Expressions

These properties are based on only the linear portion of the stress-strain curve

strength = stiffness x range

Journal Report | UP MS Orthodontics

Bending Strength RatioTo compare wire Y

with wire X and the formula that corresponds to the shapes in question


Bending Stiffness RatioGeneral bending

stiffness ratio formulae


Bending Range RatiosGeneral bending

range ratio formulae


Torsion Strength RatiosGeneral torsion

strength ratio formulae


Torsion Range Ratios General tensional

stiffness ratio formulas


Torsion Stiffness RatiosGeneral torsional

range formulas


ResultsElastic Property Ratios

are seen in Tables 4-10 for each S.S. Wire and B-Ti Wire configuration

Data AnalysisThe following charts

are expressed using Thurow’s work to better understand the outcome of the experiment.


Summary and ConclusionsNiTi makes the most active levelling wireB-Ti is a superior intermediate archwire where

flexibility is requiredS.S. and Co-Cr are wires of choice for stability

and where stability of form is required.

Download - Elastic properties of orthodontic wires

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