Abstract

Dentists have long been challenged with finding an esthetic yet durable treatment option to restore badly carious anterior teeth. Veneered stainless steel crowns have become one of these options, but these restorations often return with the veneer fractured. To help restore esthetics, the crown may either be replaced or the veneer must be repaired. The purpose of this study was to evaluate the use of three bonding agents (PQ1, C&B Metabond, and Panavia) and one restorative material (Filtek Z250, 3M) in the repair of these fractured stainless steel crown veneers. The clinical significance is to determine the best methods of repairing these crowns in the event of fracture.

A total of 90 veneered stainless steel crowns consisting of 30 from each of the following manufacturers: Cheng Crowns, Kinder Krowns, and NuSmile primary crowns were used. The crowns were cemented on to nickel chromium cast dies with Rely-X ARC adhesive resin cement. The original veneers were tested using the Universal testing machine and loading the specimen to the point of failure. The surface was then air particle abraded with aluminum oxide and then etched with Ultra-Etch, 35% phosphoric acid etchant. Ten crowns of each brand were bonded using PQ1, ten were bonded with C&B Metabond, and ten were bonded with Panavia. The samples were then restored with Filtek Z250, 3M composite. The crowns were again placed in the testing machine and loaded to failure. The peak load at failure of the original and repaired veneers was then compared.

A statistically significant difference was seen between the peak load at failure of the original composite veneers and the repairs within each group. Kinder Krowns original and repaired veneers were statistically significantly stronger than the original and repaired veneers of the Cheng or NuSmile crowns. Kinder Krowns repaired with PQ1 were statistically stronger than repairs using C&B Metabond or Panavia. No statistically significant difference was seen between repair methods for Cheng or NuSmile crowns. There was a statistically significant effect of the crown brand and method of repair as well an interaction between the two.

LLU Discipline

Pediatric Dentistry

Department

Pediatric Dentistry

School

Graduate School

First Advisor

John Peterson

Second Advisor

Neil Jessop

Third Advisor

Jay Kim

Fourth Advisor

Carlos Muñoz

Fifth Advisor

Isabella Piedra-Muñoz

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2002

Date (Title Page)

8-2002

Language

English

Library of Congress/MESH Subject Headings

Crowns; Stainless Steel; Denture Repair; Dental Bonding

Type

Thesis

Page Count

viii; 28

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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