The purpose of this investigation was to evaluate scanning electron micrographs of repeatedly cast base metal alloy. For this study two Ni-Cr-Be alloys were used; Rexillium III and Verabond.
They were repeatedly cast without addition o new alloy melting with an electric resistant furnace (Castron 8, Yoshida dental equipment Mfg.Co.).
They were etched with 10% H₂SO₄ Sol. at 300mA/㎠ for 3 minutes with the use of metal etching unit Oxyetch (OXY dental product Inc.), and ultrasonic cleaning in 18% HC1 Sol. was done.
Etched surfaces were examined under a SEM at x 200 and x 750.
The surfaces are shown in legends.