Abstract

Forty cases demonstrating at least 3 mm of lingual movement of the upper incisors were analyzed to determine the soft-tissue prediction accuracy of the Holdaway and the Ricketts methods. Initial analysis was performed by comparing predictions based on pre-treatment cephalometric tracings to post-treatment tracings. Lack of congruency was considered error and statistical analysis followed. The Ricketts method was shown to be superior for upper lip prediction on the combined 40 cases. Neither method proved superior in predicting the lower lip.

Further analysis involved segregating the cases according to individual functional lip abnormalities and again comparing the two methods for accuracy. The Holdaway method was found to be superior for lower lip predictions in cases of "lip sucking" and "lower eversion". The Ricketts method proved superior in predicting the lower lip in cases of "upper proversion". A chart was composed to indicate the varying degrees of superiority of each method, and alterations of the two methods to improve accuracy were suggested.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Lloyd E. Gauntt

Second Advisor

Robert J. Schulhof

Third Advisor

Virgil V. Heinrich

Fourth Advisor

Clelan G. Ehrler

Fifth Advisor

Logan W. Barnard

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1976

Date (Title Page)

6-1976

Language

English

Library of Congress/MESH Subject Headings

Sulfhydryl Compounds -- pharmacology; Drug Hypersensitivity; Escherichia coli -- physiology.

Type

Thesis

Page Count

1 vii; 25

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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