Abstract

This study was conducted to clinically evaluate cuspid and anterior retraction in first bicuspid extraction cases using the Light Progressive Technique. More specifically interest was centered on rate of cuspid and anterior retraction, anchorage preservation or control, difficulty of appliance adjustments, time involved in adjustments, frequency of adjustments, total retraction time, patient discomfort, root resorption, as well as a complete cephalometric appraisal. Seven patients were treated for ten months. The appliance was activated at three week intervals, and progress recorded monthly.

It was shown that this technique maintains molar anchorage during rapid cuspid retraction without relying on patient cooperation for appliance activation or for extraoral molar stabilization. However, this technique was found to moderately difficult and painful. Maxillary cuspid retraction averaged 1.14 mm/month with a range of .79 to 1.61 mm/month. Anchorage lost averaged .26 mm/month with a range of -.17 to .67 mm/month. Mandibular cuspid retraction averaged 1.10 mm/month with a range of .75 to 1.94 mm/month and molar movement averaged 0 mm/month but varied from -.90 to .56 mm/month.

Intraoral radiographs revealed cuspids tipped an average of 21.6° during retraction. Cephalometric analysis showed maxillary incisor retraction of 4.5 mm and tipping of 11.5° relative to NA. Mandibular incisors were retracted 2.9 mm and tipped 7.1° relative to NB. The mandibular plane increased approximately 1.5° during the treatment period.

Incisor retraction was incomplete and data insufficient to project results.

Department

Dentistry

School

Graduate School

First Advisor

Roland D. Walter

Second Advisor

John P. DeVincenzo

Third Advisor

Jack L. Tomlinson

Fourth Advisor

James J. Hilgers

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1972

Date (Title Page)

5-1972

Language

English

Library of Congress/MESH Subject Headings

Orthodontic; Appliances Cuspid

Type

Thesis

Page Count

vii; 32

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

Download

Share

COinS