Abstract

PURPOSE: The purpose of this study was to determine the amount of force required to fracture or dislodge the veneered facings from three veneered lower primary molar stainless steel crowns (SSC) and to characterize the veneer failures.

METHODS: The following veneered crowns were used in this study: NuSmile crowns, Kinder Krowns, and EC crowns. Twenty lower right primary first molar crowns were used from each manufacturer, for a total of 60 crowns. All crowns were cemented with glass ionomer cement to a custom fabricated die. Twenty-four hours following cementation, each die with the cemented crown was placed into a custom holder on a universal mechanical testing device (MTS Model 1125 RENEW, Canton, MA). The force was measured at which the veneer partially or completely fractured off the crown. The specimens were then examined visually to determine the location of bond failure. The results were analyzed using the Kruskal-Wallis rank test and Mann-Whitney U test at the significance level of α = 0.05.

RESULTS: The Kruskal-Wallis rank test and Mann-Whitney U test indicated that NuSmile crowns required a greater force for veneer fracture than did the Kinder Krowns which was statistically significant at α = 0.05, with a p-value < 0.0001. However, the EC crowns required the greatest amount of force to fracture or dislodge the veneer. This difference was statistically significant when compared to both the Kinder Krowns (p < 0.0001) and NuSmile (p < 0.001).

CONCLUSIONS: In light of the results from this study it is clear that the thermoplastic resin does enhance the ability of the EC crowns to withstand a greater amount of force compared to both the Kinder and NuSmile crowns. However, future studies need to be conducted to evaluate the long-term clinical significance of using a thermoplastic material as the veneer and evaluate if fewer fractures are seen in vivo.

LLU Discipline

Pediatric Dentistry

Department

Pediatric Dentistry

School

Graduate Studies

First Advisor

F. Robert Traficante

Second Advisor

Richard L. Grabowsky

Third Advisor

Jay Kim

Fourth Advisor

Bonnie A. Nelson

Degree Name

Master of Science (MS)

Degree Level

M.S.

Year Degree Awarded

2008

Date (Title Page)

6-2008

Language

English

Library of Congress/MESH Subject Headings

Crowns; Stainless Steel; Resins, Synthetic; Dental Veneers; Dental Restoration Failure

Type

Thesis

Page Count

viii; 21

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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