Abstract

A pilot study comparing force distributions of a chin cup, the Great Lakes reverse pull headgear (RPHG), Ormco's adjustable dynamic RPHG, and Grummons RPHG was done. A skull from a 69 year old female which demonstrated a Class III malocclusion was used to perform the tests of force. Forces applied to and generated on the skull were measured using a water-filled balloon system. This method was tested and found to be reliable and accurate.

Repeated measurements of force were recorded for each of the areas of stress (forehead, cheeks, chin, and condyles, as well as the posterior and superior portions of the skull). All appliances had similar forces of activation. The results showed similar magnitudes and distributions of forces for the Great Lakes RPHG and Ormco's RPHG. Of all the appliances, the chin cup demonstrated the greatest forces to the chin and condyles, these forces were comparable to the chin cup's combined forces of activation. The Grummons facemask placed no compressive load on the chin or forehead, however it did demonstrate greater reactive forces on the cheeks than protractive forces on the maxilla.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Joseph M. Caruso

Second Advisor

D. Michael Duggan

Third Advisor

Michael J. Fillman

Fourth Advisor

V. Leroy Leggitt

Fifth Advisor

Anthony B. Lier

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1994

Date (Title Page)

12-1994

Language

English

Library of Congress/MESH Subject Headings

Extraoral Traction Appliances; Malocclusion; Orthodontics

Type

Thesis

Page Count

viii; 49

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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