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Dr. Robert KusyDr. Alan R. Greenberg
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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
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Elastic Properties of Orthodontic Wires
Elastic Property Ratios
Three Basic Elastic Properties
1. Strength2. Stiffness3. Range
Stress States1. Bending2. Torsion
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Elastic Properties of Orthodontic Wires
General Expressions
These properties are based on only the linear portion of the stress-strain curve
strength = stiffness x range
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Journal Report | UP MS Orthodontics
Bending Strength RatioTo compare wire Y
with wire X and the formula that corresponds to the shapes in question
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Journal Report | UP MS Orthodontics
Bending Stiffness RatioGeneral bending
stiffness ratio formulae
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Journal Report | UP MS Orthodontics
Bending Range RatiosGeneral bending
range ratio formulae
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Journal Report | UP MS Orthodontics
Torsion Strength RatiosGeneral torsion
strength ratio formulae
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Journal Report | UP MS Orthodontics
Torsion Range Ratios General tensional
stiffness ratio formulas
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Journal Report | UP MS Orthodontics
Torsion Stiffness RatiosGeneral torsional
range formulas
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Journal Report | UP MS Orthodontics
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.
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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Journal Report | UP MS Orthodontics
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.