Abstract

An investigation was conducted to evaluate the application of Xeroradiography for imaging the Temporomandibular Joint using the Updegrave and Weinberg positioning boards and to compare these images to those obtained by conventional radiography using the same positioning boards.

A cadaver head in which three spherical radiopaque implants had been placed was used in this study. A General Electric Model 1000 (Dental Unit) was the source of radiation. The conventional radiographs were produced on Dupont Cronex 2DC film and processed by a Phillips 810 automatic processed by a Xerox "125 System".

MAGNIFICATION

A comparison of the implant sphere diameters and the implant image diameters was used to determine the existence of image magnification. A magnification factor of 5.8 percent was found to be constant for either conventional radiographs or xeroradiographs.

POSITION REPRODUCIBILITY

Traced implant images and condylar fossas were overlayed and compared. Variations were recorded and a student t-test was performed on the collected data. Computations yielded a t-value for unequal variances of 1.39. At the 95 percent confidence level (1.71) the hypothesis stating that no difference between techniques and methods as to position reproducibility could not be rejected.

RADIATION MOINTORING

Entrance and exit radiation dose levels were measured with the following results: Xeroradiography was found to require four (4) times the dose exposure level as that of conventional radiography in the order to produce an acceptable image. The exit dose for exposures made on the Weinberg positioning board was found to be 2.4 times those recorded on the Updegrave board. This was true for either xeroradiography or conventional radiography.

DIAGNOSTIC QUALITY

Diagnostic image quality was evaluated by critically viewing images sets and completing an evaluation form. This form considered four evaluation areas: Definition of structure, optimum density and contrast, least distortion, and overall best diagnostic image. The Friedman statistical test was performed on the response data. The Friedman scores indicated that there was an evaluator preference in favor of conventional radiography as to Diagnostic Quality.

By evaluating the results in the previous four areas of investigation a conclusion was drawn that Xeroradiography was not a superior method for imaging the TMJ in comparison to conventional radiography using the Updegrave or Weinberg positing boards.

LLU Discipline

Orthodontics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate School

First Advisor

Alden B. Chase

Second Advisor

Paul C. Engen

Third Advisor

Virgil V. Heinrich

Fourth Advisor

Arthur A. Morgan

Fifth Advisor

Richard A. Simms

Sixth Advisor

Roland D. Walters

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1977

Date (Title Page)

6-1977

Language

English

Library of Congress/MESH Subject Headings

Radiography, Dental; Xeroradiography; Academic theses

Type

Thesis

Page Count

vii; 54

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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