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Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast...

Date post: 29-Mar-2015
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Altered Cast Technique
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Page 1: Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast.

Altered Cast TechniqueAltered Cast Technique

Page 2: Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast.

Altered Cast TechniqueAltered Cast Technique

• Corrected Cast

• Modified Cast

• Destroyed Cast

• Corrected Cast

• Modified Cast

• Destroyed Cast

Page 3: Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast.

Altered Cast ImpressionsAltered Cast Impressions

• Impression of soft tissue if not captured in framework impression

• Impression of soft tissue if not captured in framework impression

Page 4: Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast.

PurposePurpose

• Improve adaptation of the denture base to the ridge to minimize movement during function

• Equalize stress between ridge and abutments

• Improve contours of peripheries

• Improve adaptation of the denture base to the ridge to minimize movement during function

• Equalize stress between ridge and abutments

• Improve contours of peripheries

Page 5: Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast.

When NeededWhen Needed

• Mandibular distal extensions (Class I & II)

• Extensive edentulous spans

• Any case where periphery is distorted & needs correction

• Less necessary in maxilla due to major connector contact with palate

• Mandibular distal extensions (Class I & II)

• Extensive edentulous spans

• Any case where periphery is distorted & needs correction

• Less necessary in maxilla due to major connector contact with palate

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Impression TechniqueImpression Technique

• Framework must fit intraorally

• Add tray to framework– 1 mm wax relief

– Heat and fully seat framework into wax

• Framework must fit intraorally

• Add tray to framework– 1 mm wax relief

– Heat and fully seat framework into wax

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Check Seating on Cast and in MouthCheck Seating on Cast and in Mouth

• After tray added– Rests must be fully seated

– Tissue stop contacts cast

– No resistance as framework seated

• After tray added– Rests must be fully seated

– Tissue stop contacts cast

– No resistance as framework seated

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Check PeripheriesCheck Peripheries

• 2-3 mm short of vestibular

• No displacement when: – Pull on cheeks, lips

– Patient activates tongue

• 2-3 mm short of vestibular

• No displacement when: – Pull on cheeks, lips

– Patient activates tongue

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Border MoldBorder Mold

• Same as a denture• Same as a denture

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Altered Cast ImpressionAltered Cast Impression

• Remove wax spacer

• Coat tray with adhesive

• Remove wax spacer

• Coat tray with adhesive

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Altered Cast ImpressionAltered Cast Impression

• Polyvinyl siloxane• Carefully load tray

-no material under rests, guideplanes, major connector

• Seat with pressure ONLYover rests

• Polyvinyl siloxane• Carefully load tray

-no material under rests, guideplanes, major connector

• Seat with pressure ONLYover rests

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No Pressure Over TrayNo Pressure Over Tray

• Will cause tissue compression• Will cause tissue compression

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Remove & Inspect ImpressionRemove & Inspect Impression

• Fully seated

• No material under rests or minor connectors

• Fully seated

• No material under rests or minor connectors

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Send to LaboratorySend to Laboratory

• Lab Steps– Section cast

– Place retentive grooves in cast

– Ensure no contact between impression material & cast

– Sticky wax framework in place

• Lab Steps– Section cast

– Place retentive grooves in cast

– Ensure no contact between impression material & cast

– Sticky wax framework in place

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Lab StepsLab Steps

– Box impression

– Seal retainer, major & minor connector borders

– Pour new ridge areas in different color stone

– Box impression

– Seal retainer, major & minor connector borders

– Pour new ridge areas in different color stone

Page 16: Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast.

Potential Problems with the Altered Cast Technique

Potential Problems with the Altered Cast Technique

• Framework not seated either during impression (material under rest, gp) or when being poured will result in an RPD that won’t fit properly on teeth/tissues

• Stone leaking over teeth during pouring makes articulation impossible

• Framework not seated either during impression (material under rest, gp) or when being poured will result in an RPD that won’t fit properly on teeth/tissues

• Stone leaking over teeth during pouring makes articulation impossible

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Next StepNext Step

• Lab adds record base and occlusion rim to framework for jaw relation records

• Lab adds record base and occlusion rim to framework for jaw relation records


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