Abstract

Although panoral radiography employing various techniques has been described in the literature since 1949, no information is available relative to its application in quantification of positional charge of the hard tissues of the oral region.

An assessment of the radiographic equipment available to this investigator for quantification studies seemed imperative before embarking on this research.

In order to establish a standard, five exposures were made on radiographic film rotating the source of radiation from left to right and from right to left. These films were superposed and it was established that the tolerances found using the Panorex machine were within an acceptable range.

Five additional films were exposed in a manner similar for establishing an acceptable accuracy of the Panorex machine. This time the auxiliary positioning device was completely disassembled and reassembled before each exposure. These films were superposed and photographic evidence documents the acceptability of the auxiliary device for positioning the patient.

An contact exposure was made using a wire screen. This same screen material was used on the same vertical plane as the cusps of the upper posterior teeth. Calculations were made showing the relative distortions in given dental areas.

Since repositioning of the patient is possible, and since distortion can be duplicated, it is possible to quantify the distortion found.

The following is a brief summary of the more significant findings of this investigation:

1. The Parorex machine was found to be acceptable for this investigation within certain tolerances.

2. With the use of auxiliary positioning device patients can be repositioned for subsequent panoral radiographs suitable for superpositioning.

3. Distortion in varying degrees is present on the panoral radiographs, and this distortion can be duplicated.

4. Since the distortion is duplicable, superpositioning quadrant by quadrant is possible.

[5. missing]

6. The distortion found on panoral radiographs therefore it: predictable, reproducible, and measurable.

LLU Discipline

Orthodontics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate School

First Advisor

Thomas J. Zwemer

Second Advisor

Paul H. Deeb

Third Advisor

Gayle H. Nelson

Fourth Advisor

Harold Shryock

Fifth Advisor

Robert W. Woods

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1962

Date (Title Page)

6-1962

Language

English

Library of Congress/MESH Subject Headings

Radiography, Dental.

Type

Thesis

Page Count

viii; 48

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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