Abstract

The change in the facial axis in a sample of fifth-three dolichofacial patients, was compared with a number of pretreatment cephalometric variables. A number of treatment variables were also compared with the amount of facial axis change that occurred during orthodontic treatment.

The cephalometric variables measured were:

  1. Facial axis
  2. Upper face height (maxillary height)
  3. Lower face height
  4. Posterior face height
  5. Mandibular arc
  6. Palatal-mandibular plane
  7. Palatal-occlusal plane
  8. Occlusal-mandibular plane
  9. Overbite
  10. Upper first molar to palatal plane
  11. Lower first molar to mandibular plane
  12. Lower incisor to mandibular plane
  13. Incisal edge of lower incisor to mandibular plane
  14. Xi point to occlusal plane

Treatment variables included:

  1. Age
  2. Sex
  3. Treatment time
  4. Type of leveling mechanics
  5. Type of headgear used
  6. Extraction versus non-extraction
  7. Whether elastics were used during treatment.

The sample was divided into three groups. Group 1 was comprised of 12 cases where the facial axis opened (bite closed) during treatment; Group 2 was comprised of 15 cases where the facial axis closed (bite opened) during treatment; Group 3 included 26 cases where the facial axis remained unchanged.

All of the variables were statistically compared with the amount of facial axis change that occurred during orthodontic treatment. A discriminant analysis was done to see if it would be possible, from the pre-treatment cephalometric measurements, to classify a patient into the closed, opened, or unchanged facial axis groups. Correlations and analysis of variance were used to determine the relationship, if any, between the pre-treatment cephalometric variables, the treatment variables, and the change that occurred in the facial axis.

It was concluded that of the cephalometric variables studied, no one measurement or pattern of measurements could be used to predict the facial axis response during orthodontic treatment. Correlational analysis of treatment time and facial axis (T1) measurements were found to be significant at the 0.05 level in relation to facial axis change.

It appears that the direction and amount of facial axis change that occurs during orthodontic treatment, in the dolichofacial patient, remains an unpredictable dilemma. It is important for the orthodontist to select all treatment philosophys [sic] and treatment mechanics that will treat the dolichofacial patient to an unchanged or closed facial axis response.

LLU Discipline

Orthodontics

School

Graduate School

First Advisor

Clelan Ehrler

Second Advisor

James R. Wise

Third Advisor

John Pearson

Fourth Advisor

Milford J. Anholm

Fifth Advisor

Lloyd Gauntt

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1978

Date (Title Page)

6-1978

Language

English

Library of Congress/MESH Subject Headings

Chin; Orthodontics

Type

Thesis

Page Count

vi; 31

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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