Abstract

The objective of this study was to compare the "drape" technique as proposed by Economides with the Holdaway technique in predicting post-treatment maxillary lip position and to determine which method was more accurate. Pre and post-treatment lateral cephalograms were traced for ninety (Caucasian) cases equally divided by sex into three treatment groups: a) non-extraction with at least 4mm of upper incisor retraction, b) extraction of upper first bicuspids only, and c) extraction of all first bicuspids. VTO's were constructed as outlined by Economides (drape) and Holdaway for prediction of post-treatment maxillary lip position. The predicted lip positions were compared to the actual post-treatment cephalogram and the differences measured.

The results indicated a significant difference between two prediction methods (p=.001). There was no significant difference between the two methods by age, sex, or treatment group. The drape technique demonstrated variability between treatment groups. The Holdaway prediction method proved to be a more accurate method due to its smaller mean values, less variability, and its lack of specificity to a particular treatment modality.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Michael J. Fillman

Second Advisor

Joseph M. Caruso

Third Advisor

Willis L. Schlenker

Fourth Advisor

Grenith Zimmerman

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1992

Date (Title Page)

6-1992

Language

English

Library of Congress/MESH Subject Headings

Lip -- anatomy and histology; Orthodontics -- methods; Esthetics, Dental; Forecasting

Type

Thesis

Page Count

v; 32

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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