Karl D. Peach

Abstract

The trend toward more esthetic brackets has led to smaller brackets being used by orthodontists. The purpose of this study was to determine the force required to deform these smaller brackets and calculate the stress in the metal by using a torsional wire bending force. Ten types of brackets were tested and the results analyzed to determine how bracket geometry, manufacturing method, or material selection affected the strength of brackets. Results showed a significant difference between manufacturing methods, material used, and bracket geometry. Brackets made of 17-4 PH SS and 303 SS withstood higher stress than 316 SS, and all three materials were different for force to deform. Cast, milled, and injection molded/sintered brackets were significantly different for stress to fail; milling and casting were similar to each other, but different from injection molded/sintered for force to deform.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Daniel A. Flores

Second Advisor

M. Toufic Jeiroundi

Third Advisor

R. David Rynearson

Fourth Advisor

Kenneth T. Harrison

Fifth Advisor

V. Leroy Leggitt

Sixth Advisor

Jack L. Tomlinson

Seventh Advisor

Grenith J. Zimmerman

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1994

Date (Title Page)

6-1994

Language

English

Library of Congress/MESH Subject Headings

Orthodontic Brackets -- standards; Dental Stress Analysis

Type

Thesis

Page Count

1 vi; 37

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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