The purpose of this paper is to introduce a new theoretical finishing appliance which should reduce the problems encountered during finishing with the present appliances. Maxillary and mandibular Buccal Arch Positioner appliances were constructed on a model that could deliver custom-designed force magnitude and direction to each tooth.

The mean force and displacement of 1 mm. for each flexible component were quantitated individually while all other flexible components were in a passive bracket position to see if the force magnitude to each tooth was constructed properly. Various hypothetical situation were quantitated. Unilateral mesial vectors caused skewing and labial displacement of the midline with minimal mesial forces to the posterior segments. Bilateral buccal-lingual vectors to the posterior segment cancelled out their reciprocal reactions. Bilateral intrusion or extrusion reciprocal forces were reduced greatly to the immediate adjacent teeth. Bilateral mesial vectors did not cause midline skewing but added considerably more mesial force to the posterior segments but well within the range to maintain anchorage. All skewing and displacements of flexible component can be avoided by immobilizing the flexible components to the last molars bilaterally. If the summation of mesial vectors are of great magnitude, anchorage preservation could be a problem. In such cases, placement of the rigid component into the vestibule, anatomical variation and directional extraoral force should be reanalyzed.

LLU Discipline



Graduate School

First Advisor

Roland D. Walters

Second Advisor

John P. DeVincenzo

Third Advisor

Steve N. Asahino

Fourth Advisor

Jack L. Tomlinson

Fifth Advisor

Joseph Jacobs

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded


Date (Title Page)




Library of Congress/MESH Subject Headings

Dental Instruments; Orthodontics



Page Count

vii; 38

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