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.
Related topics
- Introduction: biocompatibility, standards and specifications
- Physical properties: stress, strain, hardness, wear
- Mechanical properties: strength, elasticity, fatigue, creep
- Impression materials: alginate, elastomers — silicone, polyether
- Gypsum products: plaster, stone, die materials
- Waxes: inlay, baseplate, boxing waxes