base metal casting alloys in dentistry by dr rashid hassan
TRANSCRIPT
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By
Dr. RASHID HASSAN
BDS(de’ Mont) MSc (QMUL.UK)
Hod Science of Dental Materials
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Alloys that contain no precious element like gold, silver, platinum
or palladium.
Two most commonly used base metal casting alloys in dentistry are
1) Nickel-Chromium Alloys
2) Cobalt-Chromium Alloys.
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Used for crown & bridge casting
including porcelain fused to metal (PFM) restorations.
Used for partial denture
framework castings.
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1) Cobalt (Main constituent)
2) Chromium (No less than 25%)
3) Nickel (0-30%)
4) Molybdenum (no less than 4%)
Traces of Beryllium, Silicon & Carbon
1) Nickel (Main constituent)
2) Chromium (no less than 20%)
3) Molybdenum (No less than 4%)
4) Beryllium (No more than 2%)
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Fusion temperature range (1200-1500°C)
Two Methods
1) Acetylene-Oxygen Flame.
2) Electrical Induction Furnace.
Investment Material used
1) Silica Bonded Investment Material.
2) Phosphate Bonded Investment Material.
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Dr. RASHID HASSAN
BDS(de’ Mont) MSc (QMUL.UK)
Hod Science of Dental Materials
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