Effect of beryllium on the castability and resistance of ceramometal bonds in nickel-chromium alloys.
BACKGROUND
Castability and ceramometal bond resistance play an important role in accepting nickel-chromium alloys as a substitute for gold alloys in dentistry.


OBJECTIVE
This study was developed to verify the effect of beryllium on these factors in several compositions of nickel-based alloys by submitting them to castability and ceramometal bonding resistance tests.


METHODS
Three experimental compositions of Ni-Cr alloys with different amounts of beryllium were used. One beryllium-free alloy was used as the control.


RESULTS
Analysis of variance and Tukey's test showed significant differences (alpha = .001) for the castability test results and significant differences (alpha = .05) for ceramometal bond resistance between alloys.


CONCLUSIONS
Although the amounts of chromium, manganese, and niobium were maintained, the variations in the amounts of beryllium allowed the estimation that Be-containing alloys presented better castability than Be-free alloys. The 0.9% Be-containing alloy demonstrated higher resistance of the ceramometal bond than the Be-free alloy.
Bezzon
O L
OL
School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil.
de Mattos
M da G
Mda G
Ribeiro
R F
RF
Rollo
J M
JM
D000704:Analysis of Variance; D001608:Beryllium / Q000737:chemistry*; D002858:Chromium Alloys / Q000737:chemistry*; D001840:Dental Bonding / Q000706:statistics & numerical data; D003735:Dental Casting Technique / Q000706:statistics & numerical data; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008669:Metallurgy
D002858:Chromium Alloys; D016876:Metal Ceramic Alloys; D001608:Beryllium