Abstract

The purpose of this research was to compare the tensile bond strength of orthodontic flat based buttons bonded to bovine teeth with four commercial light-emitting diode (LED) curing lights and one conventional quartz tungsten halogen (QTH) curing light.

The dental market has recently been introduced to a number of commercially available light-emitting diode (LED) curing lights. Tensile bond strength was evaluated for LED curing lights (Rembrandt® AllegroTM, Den-Mat Corp, Santa Maria, CA), (LEDemetron, Kerr/Demetron Corp, Danbury, Conn), (Ortholux LED, 3MTMESPETM, St. Paul, MN),and (FLASH-lite 1001, Discus Dental, Culver City, CA) are compared with one high intensity halogen(Optilux 501, Kerr/Demetron Corp, Danbury, CT). Four hundred and fifty flat lingual buttons were bonded to recently extracted bovine teeth with a light cured adhesive system (Transbond XT; 3M Unitek Dental Products, Monrovia, CA). The specimens were divided into 30 groups of 15 teeth each. Polymerization times of 10 seconds, 20 seconds, and 40 seconds were tested at debonding times of 5 minutes and 72 hours. Specimens were tested in tensile strength utilizing the MTS machine (Canton, Mass) at a crosshead speed of 1.0mm/minute until tensile failure occurred. Three-way analysis between curing lights, debonding time, and curing time detected no significant difference in tensile bond strength. The Wilcoxon-Mann-Whitney Test demonstrated tensile bond strengths for the 3M Ortholux and Discus-Dental FLASH-lite 1001 were significantly greater than the Optilux 501, Rembrandt Allegro, and L.E.Demetron. The application of the Wilcoxon-Mann-Whitney tests to evaluate paired comparisons demonstrated within each debonding time for each curing light, tensile bond strength was significantly greater for 40 seconds than for 20 seconds and 10 seconds, and significantly greater for 20 seconds than 10 seconds with the exception of a few notable cases. The three exceptions were the Rembrandt Allegro, 3M Ortholux and Discus- Dental FLASH-lite 1001 between the 40 second and 20 second polymerization intervals at the 72 hour debond time. A statistical comparison of debonding at five minutes and 72 hours for each curing light at each polymerization interval resulted in a significant difference (p < 0.0001), whereby tensile bond strengths were significantly greater for 72 hour debonding compared with 5 minute debonding using the Wilcoxon-Mann-Whitney test.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate School

First Advisor

Craig A. Andreiko

Second Advisor

Joseph M. Caruso

Third Advisor

Jay S. Kim

Fourth Advisor

Carlos A. Munoz

Fifth Advisor

Roland Neufeld

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2003

Date (Title Page)

12-2003

Language

English

Library of Congress/MESH Subject Headings

Cementation -- methods; Dental Cements -- analysis; Light; Materials Testing -- methods; Dental Bonding -- methods; Tensile Strength

Type

Thesis

Page Count

viii; 42

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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