Abstract

The rapid palatal expander is an appliance which has been used to laterally expand the maxillary dental arch, with subsequent mandibular dental arch expansion.

The purpose of this study was to evaluate and quantify long term post treatment changes in the length and width of both dental arches following rapid palatal expansion.

Plaster models from eleven patients treated with rapid palatal expansion were obtained seven or more years after treatment. The dental arches were intact anterior to the first molars and no retreatment had taken place.

Maxillary and mandibular canine, premolar and molar arch width, arch length, arch circumference, and palatal depth and overbite were measured on pretreatment, post treatment and long term post treatment study models to evaluate treatment, post treatment and total changes.

Significant width increases were seen in the maxillary and mandibular first premolars, maxillary second premolars and first molars and in palatal depth for the total sample. Significant decreases were seen in maxillary and mandibular arch length, and in mandibular arch circumference. Non extraction cases had significant width increases in maxillary first and second premolars, and maxillary and mandibular first molars. Extraction cases had significant width increases in maxillary second premolars and first molars, and in mandibular first premolars. Significant decreases were seen in maxillary and mandibular arch length, and in mandibular arch circumference.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Roland D. Walters

Second Advisor

Norman S. Carter

Third Advisor

Daniel A. Flores

Fourth Advisor

Willis L. Schlenker

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1990

Date (Title Page)

6-1990

Language

English

Library of Congress/MESH Subject Headings

Dental Arch -- analysis; Palatal Expansion Technic

Type

Thesis

Page Count

v; 91

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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