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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

Publication:
May/June 1992
Volume 5 , Issue 3

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The Effect of Porcelain Veneer Extension on Strength of Metal Ceramic Crowns

Lund/Barber

Pages: 237-243
PMID: 1524646

One goal in metal ceramic substructure design is strengthening the restoration. This investigation compared the strength of four metal ceramic crown designs advocated in the dental literature. Metal ceramic crowns were fabricated, luted to a master die, and loaded to failure on a mechanical testing machine. Crowns with a facial veneer of porcelain covered occlusally with metal withstood significantly higher failure loads than did the other designs. These were followed by crowns having the porcelain extended to the central groove, crowns with facial porcelain veneers without occlusal metal coverage and, the weakest group, crowns with complete occlusal porcelain coverage. There were no significant differences between the latter three designs.

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