Abstract

This study was designed to determine whether upper central incisor inclination approximated the facial axis, long-term, posttreatment, regardless of the initial malocclusion or immediate posttreatment incisor inclination. Lateral head films at pretreatment, immediate posttreatment and long-term posttreatment were traced and evaluated. The sample was divided into facial type. Angle classification and treatment type (extraction vs. non-extraction). Statistical analyses included means, standard deviations, confidence intervals, population t tests and chi-square tabulations.

The results revealed that the upper central incisor did not approximate the facial axis after a minimum of 7 years posttreatment. This failed to support the use of the facial axis angle as a placement guide for long-term upper incisor stability. This does not preclude that placing the upper incisor parallel to the facial axis has no functional merit.

It was concluded, however, that treatment method had greater influence than did facial type. Angle classification or initial upper incisor position in determining the long-term, posttreatment stability of the upper central incisor. In extraction cases, the upper incisor became more retrusive long-term posttreatment, regardless of initial malocclusion or facial type, while in non-extraction cases, the upper incisor became more protrusive.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Joseph M. Caruso

Second Advisor

James R. Farrage

Third Advisor

Michael J. Fillman

Fourth Advisor

Roland D. Neufeld

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1994

Date (Title Page)

6-1994

Language

English

Library of Congress/MESH Subject Headings

Incisor -- physiopathology; Malocclusion -- physiopathology; Orthodontics, Corrective; Data Interpretation, Statistical

Type

Thesis

Page Count

2 vi; 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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