Abstract

The purpose of this study was to determine if a different incidence and severity of maxillary incisor apical root resorption occurs in cases treated with the 0.018 inch versus 0.022 inch slot in standard edgewise mechanics. A consecutively treated sample of 240 patients (98 boys and 142 girls), with a mean age of 13.4 years from the orthodontic clinic at Loma Linda University were studied. 120 of the cases were treated using 0.018" bracket slot with standard edgewise mechanics and 120 were treated using 0.022" non-torqued full banded standard edgewise mechanics. 60 of the cases in each of the above groups were treated with bicuspid extractions.

The results show that no significant differences were noted for either age or sex of patients at the start of treatment. No significant differences in root length changes (shortening and/or lengthening) between the 0.018" and 0.022" edgewise treated groups were noted. The mean change in root length for the sample was -1.3 millimeters. The mean root shortening for the sample was -1.8 millimeters, and the mean root lengthening for the whole sample was 0.9 millimeters.

Extraction versus non-extraction therapies also exhibited no clinically significant differences between the 0.018" and 0.022" treated groups. However, treatment time and extraction therapy did have a significant effect on root shortening. The extraction group of patients required approximately four additional months of treatment and averaged 0.5 millimeters greater resorption than the group treated with non-extraction therapy.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Christor Engstrom

Second Advisor

Norman Carter

Third Advisor

Michael Fillman

Fourth Advisor

Helene Engstrom

Fifth Advisor

Toufic Jeiroudi

Sixth Advisor

Roland D. Walters

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1986

Date (Title Page)

6-1986

Language

English

Library of Congress/MESH Subject Headings

Root Resorption; Orthodontics, Corrective

Type

Thesis

Page Count

iv; 35

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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