Abstract

Expansion of the maxilla at the midpalatal suture has had much investigation and is a recognized option in orthodontic therapy. Lateral expansions of the mandible through surgical separation at the symphysis have been done in animal studies. A combination of these procedures has not yet been done together.

The purpose of this study was to expand both the maxilla and the mandible of a baboon simultaneously while maintaining occlusion. The amount of expansion and stability was studied using photographs, models, cephalograms, and tetracycline bone labels using U.V. microscopy.

A young adult baboon with full dentition and normal occlusion was used. The expansion appliances were constructed and then inserted at the time of the mandibular osteotomy. Both appliances were activated every other day until 1 cm of dental expansion and 5mm of basal bone expansion was achieved. The appliances were left in place for three and a half months to retain the expansion, and then removed to allow relapse to take place for two months, at which time final records were made.

The dentition and alveolar processes relapsed 18 to 30 percent from maximum expansion, however the basal bone demonstrated virtually no relapse. The arch forms and intercuspation improved markedly from maximum expansion. The tetracycline labels indicate growth in the buccal plate laterally in addition to remodeling of the alveolar crest and apical areas. The maxillary and mandibular midline areas show morphologically normal, new bone growth.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Roland D. Walters

Second Advisor

Toufic Jeiroudi

Third Advisor

Gary G. Morikone

Fourth Advisor

Willis L. Schlenker

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1985

Date (Title Page)

6-1985

Language

English

Library of Congress/MESH Subject Headings

Dental Occlusion; Maxilla; Orthodontic Appliances

Type

Thesis

Page Count

iii; 26

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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