Abstract

Treatment of early childhood caries (ECC) has challenged pediatric dentists. Finding esthetically pleasing yet durable restorations of anterior teeth can be difficult. Veneered stainless steel crowns are an option but clinically, the veneers can fracture. The purpose of this study was to identify the most fracture resistant veneered stainless steel crown and to determine the best method of repair if fractured. The clinical significance is an evaluation of the best method of repairing these fractured crowns. Two surface treatments and two composite restorative materials were evaluated for repair of the fractured veneers. Forty of each of the following crown brands were tested: Cheng, KinderKrowns, NuSmile, and Dura. The original veneers were loaded in a universal testing machine to the point of fracture. The fractured surfaces were treated with aluminum oxide air particle abrasion or roughened with a diamond bur and restored with Herculite XRV Unidose composite or Filtek Z250 composite. The crowns were again loaded to failure in the universal testing machine. The peak loads at failure of the original and repaired veneers were compared.

KinderKrowns had statistically significantly stronger original veneers than Cheng or NuSmile. The Dura crown was not tested for initial strength because the softer polyethylene veneer caused plastic deformation rather than brittle failure and would not allow for a peak load to be assessed. For NuSmile and KinderKrowns, the original crowns were statistically significantly stronger than the repaired crowns. There was not a statistically significant difference between the strongest Cheng repair and its original. NuSmile and KinderKrowns had no statistically significant difference between the four repair methods. For Dura crowns, roughening with a bur and using Herculite was statistically significantly stronger than the other methods of repair. For Cheng crowns, using air particle abrasion and Z250 produced a statistically significantly stronger repair. There was a statistically significant main effect of crown brand and repair method. There was also a statistically significant interaction effect between crown brand and method of repair. Cheng crowns repaired with air particle abrasion and Z250 were the strongest repairs but results were not statistically significantly greater than the KinderKrown repairs.

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; Composite Resins

Type

Thesis

Page Count

viii; 35

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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