Abstract

Cleaning and shaping the root canal system is an important phase of endodontic therapy, and must be performed thoroughly and completely if successful root canal therapy is to be expected. A number of investigators have compared different methods of cleaning and shaping of the root canal system. The purpose of this study was to compare the effectiveness of the conventional step-back technique with that of a combination step-back/ultrasonic technique. This combination technique is a modification of the conventional step-back technique using an ultrasonic instrument alternately with hand instrumentation. Utilizing 40 canals from extracted human mandibular molar teeth with a curvature of approximately 30 degrees, the effectiveness of the conventional step-back technique was compared to that of the combination step-back/ultrasonic technique. Canal transportation was determined utilizing radiography and computer subtracted images. Canal cleanliness was evaluated microscopically at the 1, 3, and 5 mm levels.

Statistical evaluation of the results showed that the combination step— back/ultrasonic technique produced cleaner canals with less transportation as measured at the 1, 3, and 5 mm levels compared to those obtained by the convention step-back technique.

Department

Dentistry

School

Graduate School

First Advisor

Mahmoud Torabinejad

Second Advisor

Donald Peters

Third Advisor

Paul McMillan

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1992

Date (Title Page)

12-1992

Language

English

Library of Congress/MESH Subject Headings

Dental Cavity Preparation; Root Canal Therapy; Endodontics

Type

Thesis

Page Count

2; vi; 50

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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