Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Schweitzer, D.M. et al.

Schweitzer, Goldstein, Ricci, Silva, Hittelman,

Comparison of bond strength of a pressed ceramic fused to metal versus feldspathic porcelain fused to metal.

PURPOSE: To compare the debonding/crack initiation strength (D/ CIS) of a low-fusing pressable leucite-based glass ceramic (PC) fused to metal to a feldspathic porcelain (FP) fused to metal. MATERIALS & METHODS: As per ISO 9693:1999, 40 rectangular metal specimens (25.0 mm x 0.5 mm x 3.0 mm) were prepared. Twenty of the specimens were cast in a base metal nickel-chromium alloy (BA), and 20 were cast in a noble metal palladium-silver alloy (NA). Ten randomly selected NA and BA alloy specimens had FP applied. The remaining 10 NA and BA alloy specimens had ash-free wax patterns applied, the metal-wax complexes invested, and were pressed with a PC. The dimensions of the ceramic specimens were 8.0 mm x 1.0 mm x 3.0 mm, creating a combined metal-ceramic complex thickness of 1.5 mm. All specimens were subject to a three-point bending test at a crosshead speed of 1.5 mm/min. Fracture loads were recorded in Newtons and D/CISs calculated by the formula tau(b)=k x F(fail). RESULTS: Mean D/CISs, measured in MPa (standard deviations): NA-FP 32.56 (4.62), NA-PC 30.23 (5.06), BA-FP 30.98 (4.41), and BA-PC 31.81 (3.48). A two-way ANOVA (p > 0.05) did not demonstrate significant difference between groups. CONCLUSION: The debonding/crack initiation strength of a low-fusing pressable leucite-based glass ceramic fused to metal was equivalent to that of a feldspathic porcelain fused to metal.[1]

References

Comparison of bond strength of a pressed ceramic fused to metal versus feldspathic porcelain fused to metal. Schweitzer, D.M., Goldstein, G.R., Ricci, J.L., Silva, N.R., Hittelman, E.L. Journal of prosthodontics : official journal of the American College of Prosthodontists. (2005) [Pubmed]

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