James R. Wise

Abstract

The slope of the articular eminence was measured on the cephalograms of 71 subjects. The patients were divided Into three major categories on the basis of skeletal pattern, dental bite type, and Angle's classification. Skeletal pattern was determined by the mandibular plane angle (SNGoGn). High Angle and Low Angle cases were classified by two standard deviations from normal. Dental bite types were divided into Open Dental or Closed Dental according to the absence or presence of anterior disclusion, respectively. Angle's method of classification was also used to divide the sample Into Class I, II, or III malocclusions.

The eminence slope was determined by the angle it formed with sella-naslon, Frankfort horizontal, naslon-basion, palatal plane, and occlusal plane. Utilizing age as a covariable, these measurements were subjected to the f test, resulting In predicted values corrected for age. Regression analyses were performed to determine the change per year In the eminence slope and the depth of the glenoid fossa.

Comparison of the skeletal patterns revealed a significantly flatter articular eminence in High Angle cases relative to FH, NaBa, ANS-PNS, and Occlusal planes. The Open Dental group exhibited a flatter eminence relative to all planes measured but was not statistically significant. Differences between Class I, II, and III groups showed no definitive trends. The eminence slope increased with age in nearly all categories with the greatest rate occurring in Low Angle cases. Class II malocclusions, however, revealed a tendency toward flattening with age. The depth of the glenoid fossa increased with age in all categories except High Angle cases.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Roland D. Walters

Second Advisor

John P. DeVincenzo

Third Advisor

Steven N. Asahino

Fourth Advisor

Charles T. Smith

Fifth Advisor

Edwin F. Shryock

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1971

Date (Title Page)

5-1971

Language

English

Library of Congress/MESH Subject Headings

Malocclusion

Type

Thesis

Page Count

v; 22

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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