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Investment materials and casting procedures

Dental Materials · Dental (BDS)

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A 45-year-old patient needs a full metal crown for their lower second molar (tooth #47). 1. Take an impression to create a die (a model of the tooth). 2. Use blue inlay wax to shape the anatomy of the crown on the die. 3. Attach a 3mm diameter wax sprue to the thickest part of the crown. 4. Place it in a casting ring and fill with phosphate-bonded investment material. 5. Place in a burnout furnace, raising the temperature 10°C per minute until reaching 700°C. 6. Use a centrifugal casting machine to force melted Cobalt-Chromium alloy into the mold. 7. Cool, remove the investment, and polish the metal. The crown fits perfectly with no gaps.

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