Abstract

Tooth movement has been documented utilizing the panoral radiograph. A positioning device, attached to the XRM Panorex X-Ray machine, was the means of patient orientation for the necessary radiographs required during the course of this investigation.

A group of ten beginning orthodontic patients, each requiring cuspid retraction, was chosen for evaluation of tooth position. Three contemporary retraction devices were employed during the course of this study. Tooth position was documented by use of panoral radiography during the retraction of these teeth.

The panoral radiographs were taken at monthly intervals over a period of eleven months for each patient. Composite tracings were made which clearly demonstrated the cuspid position in relationship to its progress of retraction. Anatomical landmarks were employed for superposing upon each quadrant of the panoral radiograph.

To increase objectivity in appliance selection, the comparative effectiveness of three retraction devices were studied. These retraction devices were:

  1. Tieback mechanism.
  2. Pletcher spring mechanism.
  3. Ricketts sectional loop mechanism.

The use of the three retraction mechanisms provided a means to evaluate tooth position using serial panoral radiographs. The principle factors of consideration, relative to the type of retraction device employed, are as follows:

  1. The amount of tooth movement.
  2. The amount of anchorage loss of the molar.
  3. The center of rotation in the cuspid teeth.

The tooth position and its axial inclination were evaluated after four months of active retraction and at the end of the retraction phase of treatment.

The Tieback retraction mechanism demonstrated a tendency to provide a lesser amount of tooth movement after four months of retraction, however, there was no significant difference in total amount of tooth movement of any retraction mechanism at the end of the retraction phase of treatment. The Tieback device compared to the other retraction mechanisms indicated a more favorable inclination of the root position at the end of the retraction phase of treatment.

The results obtained from this limited data should not be utilized to judge the efficacy of these retraction devices. Further study is necessary and indicated to make this comparison.

This technique has application for the study of tooth movement, loss of tooth anchorage, root parallelism, tooth eruption and growth and development. Further studies are necessary to explore the potentialities of utilizing this procedure for the evaluation of the dental and oral hard structures.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Thomas J. Zwemer

Second Advisor

Edwin M. Collins

Third Advisor

Howard W. Conley

Fourth Advisor

Charles T. Smith

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1966

Date (Title Page)

6-1966

Language

English

Library of Congress/MESH Subject Headings

Tooth Movement, Minor

Type

Thesis

Page Count

x; 41

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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