Abstract

The purpose of this study is to determine if mandibular first molar distal tip back during orthodontic treatment will result in improved long-term alignment of mandibular incisors. Our pre and posttreatment sample consisted of 57 Class I and Class II patients (40 female and 17 male). Incisor irregularity was recorded at T2 and T4 (average of 12.9 years postretention at T4). Molar tipback was evaluated T1 to T2 and T2 to T4. The sample was divided into 3 groups - molars tipped distally 1 degree or more during treatment, molars essentially not tipped, and molars tipped mesially 1 degree or more during treatment. A one-way ANOVA analysis of variance comparing mean change in incisor irregularity relapse total, T2 to T4, produced a significant difference in males. Males (n=17) demonstrated significantly less postretention incisor relapse (r=0.5, p=0.038) when first molars were tipped distally during treatment. Males (n=12) with bicuspid extraction exhibited even less incisor relapse (r=0.6, p=0.039). Females demonstrated variable unpredictable results.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Michael J. Fillman

Second Advisor

Joseph M. Caruso

Third Advisor

Roland D. W. Neufeld

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1999

Date (Title Page)

9-1999

Language

English

Library of Congress/MESH Subject Headings

Molar; Incisor; Mandible; Dental Occlusion

Type

Thesis

Page Count

vii; 33

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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