Abstract

The tensile properties of .017 x .025" stainless steel. Multiphase, Blue Elgiloy, beta titanium, and Nitinol were tested and compared. All wires were tested in the "as received" condition. Fifteen samples of each type of wire were tested in order to determine the (1) modulus of elasticity, (2) .2% yield strength, (3) ultimate tensile strength, (4) percentage elongation and (5) maximum elastic deflection.

The modulus of elasticity and .2% yield strength are the most important properties to orthodontists because of their influence on the wire's stiffness, strength and range. The ratio of yield strength/modulus of elasticity, termed maximum elastic deflection, gives a measure as to the range of a wire, which is how far a wire can be deformed without exceeding its working limits. The ultimate tensile strength is the maximum load that the wire can withstand before fracture, while the percent elongation is an indication of the ductility of a wire.

Stainless steel, Multiphase, and Blue Elgiloy showed very similar properties while beta titanium and Nitinol exhibited a modulus of elasticity that was one-half to one-fourth (respectively) that of the stainless steel and chromium-cobalt alloys in the untreated conditions. For stainless steel, Multiphase and Elgiloy the percentage elongation was between 1.5 - 2.0% while that of beta titanium and Nitinol was 3.0 and 8.6% respectively. Both beta titanium and Nitinol had more favorable maximum elastic deflection ratios than the other three wires, indicating that they would have a larger range in their activations. Stainless steel had the largest .2% yield strength and tensile strength, while Nitinol exhibited the smallest .2% yield strength; beta titanium had the smallest tensile strength value.

The similar properties of stainless steel, Multiphase and Elgiloy produce forces that are more dependent upon the dimensional size of the wire rather than the wire type. Both beta titanium and Nitinol had properties that differed a great deal from the other three wires and would require larger sizes to produce forces of equal magnitude to that of steel or chromium-cobalt wire.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Donald Schmitt

Second Advisor

Joe Caruso

Third Advisor

Clelan Ehrler

Fourth Advisor

Gary Morikone

Fifth Advisor

Lawrence W. Will

Sixth Advisor

Roland D. Walters

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1981

Date (Title Page)

6-1981

Language

English

Library of Congress/MESH Subject Headings

Orthodontic Appliances

Type

Thesis

Page Count

v; 26

Digital Format

PDF

Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.

Collection

Loma Linda University Electronic Theses and Dissertations

Collection Website

http://scholarsrepository.llu.edu/etd/

Repository

Loma Linda University. Del E. Webb Memorial Library. University Archives

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