Abstract

Treatment with fixed orthodontic appliances can change the environment in the oral cavity by creating stagnant areas that facilitate bacterial colonization and substance retention. The purpose of this study was to examine in vitro plaque formation associated with bonded orthodontic appliances and how this could affect bonding strengths.

Ortho Concise and Transbond XT were the composite resin materials used in this study. Mandibular incisor metal brackets were bonded to bovine mandibular anterior teeth. Each composite resin was studied in two groups: plaque growth and without plaque growth, and their bond strengths were compared at time intervals of 3,45, and 180 days post bonding.

The plaque and control groups were sterilized by steam autoclave and placed in the Streptococcus mutans culture media or sterile saline. All samples were "debonded" by using an Instron Universal Testing machine, simulating shear failure.

Bond strength was significantly reduced In the 45 and 180 day plaque samples for both adhesives. The 180 day plaque sample had bond strengths similar to the 45 day sample, therefore, the length of time to cause this effect could be clinically brief. Plaque also affected the adhesive fracture site at debonding. This study has proven a relationship between plaque deposition and bond strength, but clinically this relationship may not result In "spontaneous" debonding of brackets.

LLU Discipline

Orthodontics

Department

Dentistry

School

Graduate School

First Advisor

Joseph M. Caruso

Second Advisor

Craig Andreiko

Third Advisor

James Kettering

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

1998

Date (Title Page)

6-1998

Language

English

Library of Congress/MESH Subject Headings

Bacterial Adhesion -- physiology; Dental Bonding; Epithelial Attachment -- physiopathology; Dental Plaque -- etiology

Type

Thesis

Page Count

vi; 25

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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