Abstract

In testing the force loss of five brands of orthodontic wire under a variety of stress modes, it was found that; 1) heat treatment reduced force loss in all the wires; 2) the amount of time-dependent force loss increased when the magnitude of force was raised.

A further indication was that a sharp bend on the tested wire did not affect force loss. Force applied to unwind a loop produced force losses from 180 to 350% above the loss that occurred when force was applied to wind a loop.

The force loss data collected during a 72-hour period was analyzed by means of statistical tests to relate and compare the effects of various factors, such as type of wire, type of bends, direction of force, amount of force, heat treatment, and time.

A total of 126 samples of Blue Elgiloy, Yellow Elgiloy, Permachrome Standard, Multiphase, and Azura wire were tested in the simple cantilever spring configuration.

It was suggested that time-dependent force loss of orthodontic wire is a low temperature creep phenomenon and that the elimination of this force loss is possible by maintaining the applied force less than the elastic limit of the wire. However, it is also possible to virtually eliminate the force loss by heat treatment of the wire.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

James R. Wise

Second Advisor

J. Milford Anholm

Third Advisor

Jack L. Tomlinson

Fourth Advisor

Clelan G. Ehrler

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1985

Date (Title Page)

6-1985

Language

English

Library of Congress/MESH Subject Headings

Orthodontic Appliances

Type

Thesis

Page Count

2 vi; 49

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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