Abstract
The purpose of this study is to evaluate the relative corrosion rates of 316-L stainless steel cast metal, cold worked, and powdered metal brackets. This is done using potentiodynamic anodic polarization to measure the voltage difference between the samples and a reference electrode. Corrosion layers effect current flow and by plotting how the current responds to an applied voltage it is possible to determine the corrosion rate of a sample. The point at where the applied voltage breaks down the passivation or oxidation layer is recorded and the relative corrosion rate is figured using the formula: Corrosion Rate (mpy) (in milliinches per year) = [(k) (Icorr) Equivalent Weight] /Density. (K is a known constant and Icorr is current density in microamps per cm2) The results indicate that the powdered metal samples had the smallest relative corrosion rate with .2256mpy, cast metal was next with .4639mpy, and cold worked had the greatest corrosion rate with 2.8135mpy.
LLU Discipline
Orthodontics
Department
Dentistry
School
Graduate School
First Advisor
J. Milford Anholm
Second Advisor
Garland E. Scott
Third Advisor
Willis Schlenker
Fourth Advisor
Virgil Heinrich
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; Corrosion
Type
Thesis
Page Count
vi; 26
Digital Format
Digital Publisher
Loma Linda University Libraries
Copyright
Author
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.
Recommended Citation
Ballweber, Timothy C., "Corrosion of Orthodontic Brackets: Cost, Cold Worked, and Powdered Metal" (1985). Loma Linda University Electronic Theses, Dissertations & Projects. 1293.
https://scholarsrepository.llu.edu/etd/1293
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