It was recently noted that the costs of the
base metal alloy manufacturing have been increased, so some dental
laboratories have recasted the alloy many times although the company's
recommendations by using the alloy once. Therefore, this study aims to
investigate the effect of re-casting the Co- Cr alloy several times on
bridge bending.
Co-Cr alloys have excellent corrosion resistance, but in the
ceramic firing process, they are exposed to high temperatures that may affect the alloy corrosion causing ions' release.
We aimed to study the effect of ceramic firing on Co, Cr ions rele
ase from Co-Cr frameworks.
So, 30 Co-Cr models were fabricated and divided randomly into
two equal groups: 1st group: (control), 2nd group: exposed to ceramic firing conditions. Then samples were submerged in artificial saliva for one month, and measurements of released ions were performed using atomic absorption spectrometry.
Concentrations of both cobalt and chromium ions released in
control group (in μg/l) were less than those in 2nd group (without a
statistically significant difference).
We can consider ceramic firing as safe and acceptable process
that slightly increase Co, Cr ions release from Co-Cr frameworks.
