Abstract

An investigation using computerized cephalometrics has been conducted to consider the cephalometric factors responsible for the characteristic appearance evident in individuals afflicted with Mandibulo-Facial Dysostosis. A pair of Negro monozygotic affected twins were studied using the other 10 non-affected members of the family as a control to minimize the environmental and hereditary factors. The Rocky Mountain Data System was utilized to analyze the lateral and frontal cephalometric radiographs of each individual using Ricketts Analysis and the data were subjected to statistical tests to determine the factors contributory to the syndrome. Age and size were considered and adjustments were made to evaluate the likelihood of changes due to growth and age.

The data from the lateral tracing were placed into three categories: Denture problems. Denture skeletal problems and Skeletal problems. The most significant defects evident were extreme protrusion of the anterior teeth beyond the A-Po plane with open bite, due primarily to intraoral demands for space and skeletal Class II open bite due to the major contributing factors listed as follows:

  1. Excessive anterior cranial base length.
  2. Maxilla in a forward position.
  3. Short corpus axis length.
  4. Mandibular arc which was obtuse.
  5. Pronounced downward and backward rotation of the mandible.
  6. Low posterior facial height.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

James R. Wise

Second Advisor

Elmer E. Kelln

Third Advisor

Alden B. Chase

Fourth Advisor

Roland D. Walters

Fifth Advisor

J. Milford Anholm

Sixth Advisor

Lee E. Olsen

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1974

Date (Title Page)

6-1974

Language

English

Library of Congress/MESH Subject Headings

Mandibulofacial Dysostosis; Twins

Type

Thesis

Page Count

viii; 70

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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