Abstract

During orthodontic treatment extra-oral forces of considerable magnitude are applied to the maxillary molar teeth to correct an anterior-posterior maxillary mandibular dysplasia.

The treatment method of choice with Class II, Division 1 malocclusions in the late mixed dentition and early permanent dentition age is generally with the use of cervical traction.

The purpose of this study is to determine the effect of cervical traction on the development of the cranial base in patients subjected to Its use.

This investigation utilized before treatment and after treatment lateral cephalometric roentgenograms of twenty-five patients presenting a Class II, Division 1 malocclusion. Post treatment roentgenograms were also compared with the cephalometric roentgenograms of a control group of a similar number, sex, and age. Measurements and comparisons of the cranial base were made by utilizing the three angles formed by the landmarks: Bolton-sella-nasion, basion-sella-nasion, and articulare-sella-nasion.

A statistical analysis was applied to the data according to accepted procedures.

No significant changes in the cranial base were noted when comparing the angles before treatment and after treatment in the experimental group.

No significant differences in the angles were observed when the post-treatment roentgenograms of the treated group were compared with roentgenograms of a non-treated group.

It can be concluded on the basis of the twenty-five cases of this study:

  1. That the impact of cervical traction therapy in Class II, Division 1 malocclusion upon the cranial base is not demonstrable cephalometrically using the cranial base angulations as employed in this study.
  2. That the magnitude of change, if it exists, must therefore be very small.
  3. The amount of change necessary to correct a Class II, Division 1 anterior-posterior dysplasia is of sufficient magnitude to be picked up by these cranial base angles if the change occurred at this point.
  4. The anterior-posterior changes between maxilla and mandible which do occur must therefore be within the face or between the face and the anterior cranial base.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Thomas J. Zwemer

Second Advisor

Walter H. B. Roberts

Third Advisor

Paul H. Deeb

Fourth Advisor

Edward Kemler

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1963

Date (Title Page)

6-1963

Language

English

Library of Congress/MESH Subject Headings

Skull Base; Malocclusion, Angle Class II; Traction

Type

Thesis

Page Count

vi; 44

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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