Dr. Linninger Mercedes assistant professor Semmelweis ... · Casting the dental alloy Deflasking...
Transcript of Dr. Linninger Mercedes assistant professor Semmelweis ... · Casting the dental alloy Deflasking...
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Investing and casting
Dr. Linninger Mercedes
assistant professor
Semmelweis University, Department of Prosthodontics
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Casting investments:
• Lost-wax process
– In use for many thousands of years
– Jewellery, ornaments, decorated objects
– Bronze, gold etc. (ages)
• Investing: wrapping the pattern
• Investment agent: material used for it
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Preparation of teeth
Impression taking
Gipsum cast
Wax pattern
Framework
Veneered framework
Cementation of FPD
Precisional dental
casting technique
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Wax pattern
Framework
Precisional dental
casting technique
Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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Lost wax technique
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Sprueing the wax pattern
Sprue
Lost-head
(reservoire)
For
preventing
cavities and
porosities, due to the
thermal
contraction
Images from Bego Virtual Academy
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Sprueing the wax pattern
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Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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Wax pattern: the preformed applience, we want to cast
Mold: the form we want the molten alloy to cast in
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Investing the wax pattern
The casting ring The casting ring with the wax pattern
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• Wax shrinkage: 0,3-0,4 %
• Alloy shrinkage: 1,3-1,6 % (noble)
2.0 – 2,3 % (base alloys)
Casting shrinkage
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Investing the wax pattern
Investment materials
plaster-
bonded
gypsum
Liquid:
Powder:
Sulfate contained sublimates - toxic
Water ( no controll of the expansion )
Used in case of gold
and acrilyc works
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Investing the wax pattern
Investment materials
silica-
bonded
phosphate-
bonded
Heat-resistant particles (quartz, cristobalite)
Bonding agent (plaster- or silica- or phosfate based component)
Liquid
Powder
Total expansion = setting + thermal expansion
(controls the expansion )
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Contraction – expansion:
• Liquid contraction: cooling molten metal
• Erectile contraction: during cristallization
• Solid contraction: chilling to room
temperature
Must be compensated by the investment
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Expansion of investments
• Setting expansion
– Mixing powder and liquid
• Thermal expansion
– Preheating
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Vacuum mixing
Investing the wax pattern
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Investing the wax pattern
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Investing the wax pattern
Setting
expansion
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Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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Burning out the wax pattern
… in the furnace
Thermal
expansion
Images from Bego Virtual Academy
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Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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The casting technique
Melting the alloy
Casting the alloy
• Open flame
• Induction melting
• Vacuum pressure casting
• Centrifugal casting
Casting the dental alloy
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The molten mass
Hot zone
Crucible (melting pot)
Casting mould
Casting the dental alloy
Images from Bego Virtual Academy
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Casting the dental alloy
Images from Bego Virtual Academy
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Casting the dental alloy
Images from Bego Virtual Academy
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Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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Deflasking the cast
Long cooling time
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Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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Sandblasting the framework
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Sprueing the wax pattern
Investing the wax pattern
Burning out the wax pattern
Casting the dental alloy
Deflasking the cast
Sandblasting the framework
Finishing the framework
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Finishing the framework
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Preparation of teeth
Impression taking
Gipsum cast
Wax pattern
Framework
Veneered framework
Cementation of FPD
Precisional dental
casting technique
![Page 40: Dr. Linninger Mercedes assistant professor Semmelweis ... · Casting the dental alloy Deflasking the cast Sandblasting the framework Finishing the framework . Lost wax technique .](https://reader033.fdocuments.in/reader033/viewer/2022050400/5f7dcc042ecebd78a420db84/html5/thumbnails/40.jpg)
Thank You for Your attention!