Abstract

A study of orthodontic treatment results was made on forty patients treated by the graduate students Loma Linda University. The purpose of the study was to determine the treatment changes in patients treated in the graduate clinic. The study was based on the findings of the cephalometric and full mouth radiographs. The distribution of the malocclusions were similar to those found in other studies. The group of forty patients was divided for paired comparisons of type of malocclusion, length of treatment, and extraction of teeth. Statistical correlations were computed on every change investigated in this study.

The Steiner Analysis and superposition measurements were taken from the lateral head cephalograms. The following is a summary of the cephalometric findings:

  1. The findings from this study were consistent with previous studies.

  2. The measurements from the Steiner Analysis and the direct superpositions were comparable; however, the amount of change with the superposition was greater.

  3. The ANB reduction was primarily by the reduction of point A. Point B changes were minimal.

  4. Comparisons between extraction and non-extraction group showed statistical significance in the treatment changes. In general, retraction of teeth and lips were greater in the extraction group.

  5. In comparison to the Class I group, the Class II group showed greater changes in the following: (a) mandibular plane angle increase, (b) drop of the maxilla, and (c) elevation of the maxillary and mandibular molars.

  6. The short treatment time group and the long treatment time group showed little statistical significance in the paired comparisons.

The full mouth radiographs were used to determine the effects of treatment on root resorption, alveolar bone changes, and the parallelism of roots. Sixty-five per cent of the patients had root resorption, and 27.8 per cent of the teeth were affected. Distribution of root resorption was equal between the maxilla and the mandible.

No significant correlations were found in age, sex, treatment with root resorption. A definite selectivity among patients was evident; certain patients showed a predisposition to root resorption.

The changes in the alveolar bone did not appear to have clinical significance in conjunction with orthodontic treatment. Wide divergence of roots and the flattening of the alveolar crest showed slight correlation.

LLU Discipline

Orthodontics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate School

First Advisor

Thomas J. Zwemer

Second Advisor

Howard W. Conley

Third Advisor

Alden B. Chase

Fourth Advisor

Karl K. Nishimura

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1965

Date (Title Page)

9-1965

Language

English

Library of Congress/MESH Subject Headings

Orthodontics, Corrective

Type

Thesis

Page Count

76 pg.

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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