Abstract

Plaster casts of teeth and lateral cephalometric roentgenograms were studied to see with what degree of accuracy sex could be determined. The sample considered was made up of one hundred and forth-four individuals--50 males and 94 females--being treated in the Graduate Orthodontic Department of the Loma Linda University School of Dentistry. The age range for the boys was from 15 to 19 and for the girls, from 14 to 20. Data was obtained for the following variables from tracings of the roentgenograms and from the dental casts:

  1. Glabello-occipital length
  2. Articulate to nasion
  3. The gonial angle of the mandible
  4. Prosthion to nasion
  5. The height of the mandibular symphysis and lower incisor teeth
  6. The height of the ramus of the mandible from the gonial angle to articulate
  7. The mesiodistal width of the maxillary right cuspid
  8. The mesiodistal width of the mandibular right first molar
  9. The buccolingual width of the mandibular right first molar
  10. The difference between the mesiodistal width and the buccolingual width of the mandibular right first molar
  11. The buccolingual width of the mandibular right second molar
  12. The mesiodistal width of the maxillary right central incisor
  13. The mesiodistal width of the mandibular right central incisor
  14. The difference between the mesiodistal widths of the maxillary and mandibular right central incisors
  15. The mesiodistal width of the maxillary right lateral incisor
  16. The difference between the mesiodistal width of the right maxillary central incisor and the maxillary lateral incisor
  17. The mesiodistal width of the right mandibular cuspid
  18. The difference between the mesiodistal width of the right mandibular cuspid and first molar
  19. The mandibular arch width as measured from the most lateral aspect of the first molar crowns.

The mean, range and standard deviation was figured for each measurement. A stepwise discriminant analysis was performed to determine the degree of discrimination possible between the males and the females.

Using both dental measurements from the dental casts and skeletal measurements from the roentgenograms, the males were divided from the females with 90.2 percent accuracy. Forty-four out of the 50 males and 86 of the 94 females were classed correctly. By using only skeletal measurements, the investigator correctly classified 37 males and 75 females. This denoted accuracy of 77.1 per cent.

Using the dentition alone to determine sex, the investigator was able to correctly sex 83.3 per cent or 43 males and 77 females.

Not all measurements were useful in determining sex. The most significant measurements for determining sex in the order of their importance are:

  1. Prosthion to nasion length.
  2. Width of mandibular arch.
  3. Mesiodistal width of mandibular cuspid.
  4. Glabello-occipital length.
  5. Mesiodistal width of mandibular first molar.
  6. Difference between mesiodistal width of mandibular cuspid and first molar.
  7. Mesiodistal width of mandibular central incisor.
  8. Articulare to nasion.
  9. Mesiodistal width maxillary central incisor.
  10. Difference in mesiodistal width of maxillary and mandibular central incisors.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Howard W. Conley

Second Advisor

Alden B. Chase

Third Advisor

Walter H. B. Roberts

Fourth Advisor

James Stirling

Fifth Advisor

Paul Y. Yahiku

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1968

Date (Title Page)

5-1968

Language

English

Library of Congress/MESH Subject Headings

Cephalometry; Sex Determination

Type

Thesis

Page Count

vi; 41

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

Download

Share

COinS