Abstract

The principal objective of this study was to use computer aided design (CAD) to better illustrate and quantify the relationship of mandibular arch depth, mandibular arch width, overbite, and overjet in the presence of mandibular dental crowding. To date, there has been no research examining how changes in the mandibular arch limit the orthodontist's ability to control overbite and overjet. Understanding how to effectively manage overbite and overjet are crucial to the clinician's ability to manipulate incisal display. Polyvinyl siloxane impressions of both maxillary and mandibular arches of a Caucasian patient were taken and used to pour dental stone models. Models were then potted, scanned, manipulated, and measured using Insignia™ (Ormco Corporation, Glendora, CA). Five different groups of maloccluded, diagnostic set-ups were subsequently constructed based upon location of crowding in the arch. For all groups, regression analysis revealed similar linear relationships (R2=0.963-0.999) for arch depth, arch width, and overjet changes versus dental crowding. In contrast, overbite changes displayed linear, quadratic, and cubic relationships (R2 = 0.688-0.997). Results suggest that lingual contours of maxillary incisor crowns are smile arc determinants and rate determining factors of overbite change. Guidelines for managing overbite and incisal display are offered.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Dentistry

School

Graduate School

First Advisor

Craig Andreiko

Second Advisor

Joseph Caruso

Third Advisor

Jay Kim

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2005

Date (Title Page)

12-2005

Language

English

Library of Congress/MESH Subject Headings

Jaw Fixation Techniques; Mandible; Temporomandibular Joint; Maxilla

Type

Thesis

Page Count

viii; 56

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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