Elastic properties of orthodontic wires
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Transcript of Elastic properties of orthodontic wires
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 Properties of Orthodontic Wires
Elastic Property Ratios
Three Basic Elastic Properties
1. Strength2. Stiffness3. Range
Stress States1. Bending2. Torsion
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
Journal Report | UP MS Orthodontics
Bending Strength RatioTo compare wire Y
with wire X and the formula that corresponds to the shapes in question
Journal Report | UP MS Orthodontics
Bending Stiffness RatioGeneral bending
stiffness ratio formulae
Journal Report | UP MS Orthodontics
Bending Range RatiosGeneral bending
range ratio formulae
Journal Report | UP MS Orthodontics
Torsion Strength RatiosGeneral torsion
strength ratio formulae
Journal Report | UP MS Orthodontics
Torsion Range Ratios General tensional
stiffness ratio formulas
Journal Report | UP MS Orthodontics
Torsion Stiffness RatiosGeneral torsional
range formulas
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.
Journal Report | UP MS Orthodontics
Journal Report | UP MS Orthodontics
Journal Report | UP MS Orthodontics
Journal Report | UP MS Orthodontics
Journal Report | UP MS Orthodontics
Journal Report | UP MS Orthodontics
Journal Report | UP MS Orthodontics
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.