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

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Presentation on theme: "Altered Cast Technique Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast."— Presentation transcript:

1

2 Altered Cast Technique

3 Corrected Cast Modified Cast Destroyed Cast Corrected Cast Modified Cast Destroyed Cast

4 Altered Cast Impressions Impression of soft tissue if not captured in framework impression

5 Purpose 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

6 When 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

7 Impression 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

8 Check 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

9 Check 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

10 Border Mold Same as a denture

11 Altered Cast Impression Remove wax spacer Coat tray with adhesive Remove wax spacer Coat tray with adhesive

12 Altered Cast Impression Polyvinyl siloxane Carefully load tray -no material under rests, guideplanes, major connector Seat with pressure ONLY over rests Polyvinyl siloxane Carefully load tray -no material under rests, guideplanes, major connector Seat with pressure ONLY over rests

13 No Pressure Over Tray Will cause tissue compression

14 Remove & Inspect Impression Fully seated No material under rests or minor connectors Fully seated No material under rests or minor connectors

15 Send 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

16 Lab 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

17 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 wont 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 wont fit properly on teeth/tissues Stone leaking over teeth during pouring makes articulation impossible

18 Next Step Lab adds record base and occlusion rim to framework for jaw relation records


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