A study of orthodontic treatment results employing Class II Armstrong Adjustable Intermaxillary Springs was made on twenty-eight randomly selected patients which were treated by Dr. Maclay Armstrong.

The skeletal and dental changes observed during treatment with the Class II springs was compared with those results observed when comparable type malocclusions were treated with Class II elastics. A list of changes which were observed during treatment with Class II elastics was compiled from the literature using individual studies published by Ricketts, Creekmore and Hanes.

The study was based on the findings observed in the initial and final cephalometric radiographs. A statistical approach which employed the Student's "t" test was used in order to determine any significant difference between the results obtained with Class II springs and those obtained with Class II elastics.

The cephalometric study was based on no particular analysis but the method of superimposition followed the technique described by Steiner.

This study based upon the observations made would suggest that treatment in cases where Class II elastics may have previously been used to accomplish certain objectives and especially in those cases where patient cooperation was a problem can be accomplished with the use of Class II Armstrong Adjustable Intermaxillary Springs. The employment of the Class II springs, with the indicated auxiliaries, to accomplish treatment had an influence on both skeletal and dental changes.

Observations made on the comparison between cases treated with Class II springs and Class II elastics did not indicate a significant difference in the majority of skeletal changes although a significant difference was noted in all dental changes with the exception of the extrusion of the maxillary first molars.

LLU Discipline





Graduate School

First Advisor

Roland D. Walters

Second Advisor

Alden B. Chase

Third Advisor

E. Jan Davidian

Fourth Advisor

Lloyd E. Gauntt

Fifth Advisor

John W. Elick

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded


Date (Title Page)




Library of Congress/MESH Subject Headings

Orthodontic Appliances



Page Count

vi; 41

Digital Format


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.


Loma Linda University Electronic Theses and Dissertations

Collection Website



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