Abstract

The purpose of this study was to determine the relative safety of headgear safety straps. Samples from five different safety headgear straps simulated orthopedic and orthodontic use and data were collected from a series of pulls on an Instron machine. The straps were compared by the distance the face bow traveled before the safety mechanism released, the force built into the face bow at safety release and the force required to remove the inner bow out of the molar tube. The conclusions are as follows: (1) the distance a face bow can travel from the molar tube and still be intraoral is 24.3 mm, (2) the definition of a "relatively safe" headgear strap is a strap that allows the face bow to travel less than 24.3 mm, (3) the definition of an "absolutely safe" headgear strap is a strap that does not allow the inner bow to leave the molar tube, (4) one strap met the standard of relative safety at orthodontic and orthopedic preloads, (5) two straps qualified as relatively safe at orthopedic preloads, but did not meet the safety standard at orthodontic preloads, (6) two straps did not meet the definition of relative safety at orthodontic or orthopedic preloads, (7) no headgear strap proved to be absolutely safe, and (8) the clinical use of headgear, whether lighter or heavier forces are used, has an affect on the safety of their release mechanism.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

M. Toufic Jeiroudi

Second Advisor

Joseph M. Caruso

Third Advisor

Jack L. Tomlinson

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1990

Date (Title Page)

6-1990

Language

English

Library of Congress/MESH Subject Headings

Orthodontics Appliances, Removable; Accident Prevention

Type

Thesis

Page Count

iv; 39

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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