Abstract

Although the Panorex X-ray unit has been in existence for almost a decade, no information is publicly available relative to the determination of its laminagraphic slice width or position.

In order to utilize the machine most effectively as a research tool, it seems imperative that this width and position be established.

For the purpose of establishing the spatial relationship within the exposure mechanism, the two eccentric rotational axes were first located. Utilizing a positioning device, ten panoral radiographs of a plastic working dummy with metallic implants were exposed at varying exposure readings. The resultant radiographs, revealing varying degrees of accuracy and distortion, permit plotting and construction of a template and defined the outlines of the laminagraphic width.

After the location of the template in relationship to the exposure mechanism was established, six subjects were placed in the positioning device for panoral radiographic exposures. These patients represented various arch sizes from small to large—with varying symmetries (Illustrations 13, 16, and 19).

Two subjects whose arch size and symmetry most nearly conformed to the template were radiographed. They were stabilized by the use of the positioning device. In general, the panoral radiographs of these two subjects properly positioned within the range of laminagraphic width and position displayed less distortion and less overlapping of the posterior teeth.

A method has been developed to determine curved surface laminagraphic width and position in panoral radiography utilizing the Panorex X-ray unit and employing its large and small cams. This study provides guidance to a more rational selection of patient arch size and symmetry for research purposes. This then permits proper positioning of the patient during panoral radiographic exposure for optimal clarity.

LLU Discipline

Orthodontics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate School

First Advisor

Alden B. Chase

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

1967

Date (Title Page)

6-1967

Language

English

Library of Congress/MESH Subject Headings

Radiography, Dental; Dental Instruments

Type

Thesis

Page Count

vii; 52

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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