Abstract

Pre-adjusted bracket systems offer the clinician the convenience of working with both fewer in number and smaller in magnitude adjustments of an archwire. The purpose of this in vitro study was to examine the normal variations in crown angulation of individual maxillary bicuspids, in a simulated flat plane of occlusion, and how this relates to marginal ridge discrepancies. A second purpose of this study was to examine these same teeth for the angulations of the roots. Fifty maxillary first bicuspids and thirty eight second bicuspids from the Loma Linda University Dental School restorative dentistry department were, in a flat plane of occlusion, examined. These teeth, with respect to variation in angular measurements of the roots and crowns, were measured at the level of the marginal ridges. From these measurements, the data analysis calculated the mean and standard deviation for angulation, mean difference of measurements, a linear regression relating crown angulation to root angulation, and a millimeter measurement for marginal ridge discrepancy.

Conclusions are presented showing the first maxillary bicuspid to have a mean negative crown angulation of 0.52 degrees, mean distal root tip of positive 8.08 degrees, and a marginal discrepancy of only 0.072mm. The second maxillary bicuspid exhibited mean measurements of 3.70 degrees of positive crown angulation, distal root tip of positive 3.68 degrees, and a marginal ridge discrepancy of 0.48mm.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

James Farrage

Second Advisor

Joseph M. Caruso

Third Advisor

David Rynearson

Fourth Advisor

Craig Andreiko

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1993

Date (Title Page)

6-1993

Language

English

Library of Congress/MESH Subject Headings

Bicuspid; Orthodontics

Type

Thesis

Page Count

iv; 41

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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