Document Detail

Comparison of the load at failure of soldered and nonsoldered porcelain-fused-to-metal crowns.
MedLine Citation:
PMID:  12942056     Owner:  NLM     Status:  MEDLINE    
STATEMENT OF PROBLEM: The application of solder material to metal frameworks could affect the porcelain-to-metal failure load and possibly compromise the longevity of porcelain-fused-to-metal crowns. PURPOSE: This in vitro study assessed the influence of solder on the porcelain failure load between metal and porcelain, using crown-shaped specimens. MATERIAL AND METHODS: Forty standardized crown patterns were fabricated on a metal die and cast with noble alloy (Protocol). The specimens were divided into test (soldered, n=20) and control (nonsoldered, n=20) groups. A 2-mm-diameter perforation was produced on the buccal surface of the test specimens, 1.5 mm apical to the junction between occlusal and buccal surfaces. The perforation was repaired with high-fusing white ceramic solder material. All castings were finished with aluminum oxide stones and airborne-particle abraded with 50-microm aluminum oxide at 75 psi of pressure. Two layers each of opaque and dentin porcelain were applied on all specimens. All crowns were subjected to a vertical compressive load with a universal testing machine at a crosshead speed of 0.5 mm/min until fracture. The loading apparatus of the device contacted the buccal cusp only. In both control and test groups, 10 crowns were loaded with a stainless steel pin (phase I) whereas the remaining 10 in each group were loaded with a carbon steel pin (phase II). Means of loads at failure were recorded in each group for each pin type and compared (soldered vs nonsoldered) by use of a t test (alpha=.05). RESULTS: Mean failure load for nonsoldered crowns was 349 +/- 63 kgf in phase I and 228 +/- 49 kgf in phase II. Soldered crowns showed a significantly lower failure load (265 +/- 82 kgf [phase I; P<.02] and 154 +/- 108 kgf [phase II; P<.04]) and a greater standard deviation. CONCLUSION: Soldered metal-porcelain crown specimens demonstrated a significantly lower load at failure. Within the limits of this study, it was concluded that solder material might negatively affect porcelain-metal crowns.
Min-Sok Kang; Carlo Ercoli; Daniel F Galindo; Gerald N Graser; Mark E Moss; Ross H Tallents
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  90     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2003-08-27     Completed Date:  2003-11-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  235-40     Citation Subset:  D; IM    
Division of Prosthodontics, Eastman Dental Center, University of Rochester, 625 Elmwood Avenue, Rochester, NY 14620, USA.
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MeSH Terms
Dental Pins
Dental Restoration Failure*
Dental Soldering*
Dental Stress Analysis
Materials Testing
Metal Ceramic Alloys*
Stainless Steel
Reg. No./Substance:
0/Metal Ceramic Alloys; 12597-68-1/Stainless Steel; 12597-69-2/Steel

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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