Abstract

Soft and hard tissue changes, in the nasolahial angle and the region of the upper lip, were compared in two modes of treating Class II, Division 1 maloclussion: 1) extraction of the upper first bicuspids and retraction of the anterior segment surgically by means of the Anterior Maxillary Osteotomy CAMO), 2) extraction of upper first bi cuspids and retraction of the anterior teeth by orthodontics alone. The first group consisted of twenty-five (25) patients; the second group consisted of thirty-six C36) patients.

Analysis of the resulting changes demonstrated the following:

With surgery ANS was retracted 2.52 mm, "A Point" was retracted 3,63 mm; but with, orthodontics both points remained essentially unchanged.

With surgery the upper incisor was retracted 7.56 mm; with orthodontics it was retracted 6.06 mm.

With surgery the nasolabial angle opened 13.54°; with orthodontics it opened 5.83°.

Specific hard to soft-tissue ratios for this area have a high degree of variability. Caution is advised when predicting change in the nasolabial angle until further study on this area has been completed.

With surgery the tip of the nose retracted more as did the soft "A Point" and the upper lips when compared to orthodontic treatment alone.

Soft "A Point" did retract with orthodontic treatment even though hard "A Point" did not change, due probably to the uncurling and rotating back of the upper lip which was a result of incisor retraction.

With orthodontics the soft-tissue changes were due mainly to incisor retraction whereas with surgery they were related also to the bony movement. All soft-tissue changes were exaggerated with surgery.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Lawrence W. Will

Second Advisor

Grenith J. Zimmerman

Third Advisor

James R. Wise

Fourth Advisor

Lloyd W. Gauntt

Fifth Advisor

Logan W. Barnard

Sixth Advisor

Robert V. Fontanesi

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1979

Date (Title Page)

6-1979

Language

English

Library of Congress/MESH Subject Headings

Orthodontics, Corrective

Type

Thesis

Page Count

vi; 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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