Abstract
The purpose of this study was to compare liquid and gel etchants (37% phosphoric acid) by measuring tensile and shear bond strengths of four orthodontic adhesive systems.
Four orthodontic adhesives were tested on 287 extracted human teeth, 144 of which were etched with liquid and 143 with gel. The four adhesives tested were Concise-3M, Challenge-Ormco (new product), Unite-Unitek (no mix), and Fuji Glass-ionomer filling material or cement.
To eliminate the use of wire for bracket engagement during testing, two devices were designed and machined for direct attachment to the Instron testing machine: a rigid push rod for shear force and an adjustable bracket clasp for tensile force testing.
No significant difference in shear or tensile bond strength was observed between the two etchants when the entire 287 samples were considered. The Glass-ionomer had significantly lower mean bond strength in both the shear and tensile force direction than the other three adhesives. In the tensile direction, the mean bond strength of Challenge was significantly higher than Concise or Unite, which were not significantly different from one another. In the shear force direction the mean bond strength of Unite was slightly higher than that of either Challenge or Concise but not statistically different.
LLU Discipline
Orthodontics
Department
Dentistry
School
Graduate School
First Advisor
Roland D. Walters
Second Advisor
Michael J. Fillman
Third Advisor
Garland E. Scott
Fourth Advisor
Grenith J. Zimmerman
Degree Name
Master of Science (MS)
Degree Level
M.S.
Year Degree Awarded
1987
Date (Title Page)
6-1987
Language
English
Library of Congress/MESH Subject Headings
Dental Bonding -- methods; Tensile Strength
Type
Thesis
Page Count
vii; 39
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
Edgmon, Gary M., "A Comparison of Liquid and Gel Etchants Determining Shear and Tensile Bond Strengths of Four Orthodontic Adhesives" (1987). Loma Linda University Electronic Theses, Dissertations & Projects. 2260.
https://scholarsrepository.llu.edu/etd/2260
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