Abstract

Four periodontal parameters were examined to determine the effect of rapid and slow palatal expansion techniques on the supporting structures at the buccal aspect of the maxillary first permanent molars. The parameters examined included the levels of crestal alveolar bone and soft tissue attachment (relative to the cemento-enamel junction), the depth of the gingival sulcus, and the height of the attached gingiva. The area between the buccal roots was inspected for possible furcation involvement. Twenty-eight patients had experienced a rapid technique utilizing a tissue-born, fixed, split-acrylic appliance, while thirty-three patients had been treated with the quad-helix appliance associated with slow expansion therapy. At the time of measurement, the rapid and slow groups demonstrated a mean increase in maxillary first molar width of 4.6mm. and 4.3mm. respectively. A group of twenty-eight post-orthodontic patients who had not undergone palatal expansion therapy was utilized as a control. The results indicate a trend toward a somewhat greater tissue response to the rapid expansion palatal expansion technique. This included lower crestal bone and attachment levels, as well as a larger amount of attached gingiva. Sulcus depth measurement varied between the three groups involved. Comparisons between the rapid and slow expansion groups demonstrated statistically significant differences in bone and attachment levels at the left molar (P 0.01) and bone levels only on the right side (P 0.05). Although the mean differences were clinically small, (less than 0.5mm.), and no areas of furcation involvement were discovered, the largest percentage of those patients exhibiting the lowest bone and attachment levels were found in the rapid expansion group. Many variables were examined; however, it would be difficult to predict individual susceptibility to tissue loss from the present study.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

John K. Pearson

Second Advisor

Roland D. Walters

Third Advisor

Jan Egelberg

Fourth Advisor

Bjorn U. Zachrisson

Fifth Advisor

James R. Wise

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1981

Date (Title Page)

6-1981

Language

English

Library of Congress/MESH Subject Headings

Palatal Expansion Technique; Periodontics

Type

Dissertation

Page Count

iii; 47

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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