Abstract

With the development of new high-intensity curing lights, the time required to bond orthodontic brackets is steadily decreasing. The objective of this study was to determine the optimum curing time for bonding orthodontic brackets using four different visible curing lights (Standard Optilux 501, High Intensity Optilux 501 with Turbo Tip, Virtuoso Plasma Arc, and ESPE LED light). This study also tested the new generation of light emitting diode (LED) lights to determine if they can be used for bonding orthodontic brackets. Three hundred freshly extracted bovine teeth were mounted in acrylic resin and divided into 20 groups of 15 teeth each. Precoated stainless steel mandibular incisor brackets (APC, 3M Unitek) were bonded to the teeth using the four different curing lights at five different curing times. The Optilux 501 and ESPE LED light were used to bond brackets for 6, 10, 20, 30, and 40 seconds, while the Optilux 501 in boost mode with a turbo tip bonded brackets for 6, 8,10, 20, and 30 seconds. The Virtuoso Plasma Arc was used at 3, 5, 7, 9, and 12 second curing times. All brackets were debonded 30 minutes after light curing using an MTS Universal Testing Machine, model 1125 (MTS System Corporation, Eden Prarie, MN) to determine shear bond strength. A statistical regression model of the shear bond strength was developed for each light. A clinically acceptable bond strength of 6 MPa was used to determine the optimum bonding time of each light from the regression model. The optimum curing times were Optilux 501: 10 seconds, Optilux 501 in boost mode with turbo tip: 8 seconds, Virtuoso Plasma Arc: 5 seconds, and ESPE LED light: 21 seconds. The data were analyzed with a 2-factor analysis of variance (ANOVA) mixed model and Student- Neuman-Keuls Multiple Comparison Tests. There was a statistically significant main effect of curing lights (p < 0.0001) and a statistically significant main effect of time (p < 0.0001), but no statistically significant interaction effect of curing light and time (p = .123). The Optilux 501 in boost mode with turbo tip offers the best combination of features: 8 second curing time, moderate price, built-in intensity meter, and average size.

LLU Discipline

Orthodontics and Dentofacial Orthopedics

Department

Orthodontics and Dentofacial Orthopedics

School

Graduate School

First Advisor

Leroy Leggitt

Second Advisor

Jay A. Kim

Third Advisor

Carloz A. Munoz

Fourth Advisor

Roland Neufeld

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2001

Date (Title Page)

6-2001

Language

English

Library of Congress/MESH Subject Headings

Dental Bonding; Resins, Restorative; Orthdontic Brackets

Type

Thesis

Page Count

viii; 32

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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