Master Cast and Die Preparation (RD3
Quiz 2)
Fixed Prosthodontics Procedures
1. patient interview
+ diagnosis and treatment plan
+ tooth preparation
+ provisional
+ impression
+ interocclusal (bite registration)
2. master cast and die construction
+ crown fabrication
3. try-in
+ cementation
+ maintenance
,Definitive (working/master) Casts
- the replica of the prepared teeth, ridge areas and other parts of the dental
arch
- die: the positive reproduction of the form of a prepared tooth in any suitable
substance
Must Haves of Dies and Working Casts
- Must be bubble free, especially along finish lines
- Must be free from distortion
- Working dies must be removable, but must return to
their exact position without rotation
- Working dies must be trimmed to allow access for
waxing instruments
- Working casts should be removable from its base
Interocclusal (Bite) Registration
- The most accurate method to to occlude opposing
, casts is by hand, without any intervening bite
registration material.
- An interocclusal record is needed if there are
insufficient stability of the casts for hand articulation.
- When too many teeth are missing, a record base is
often required.
Materials Used for Interocclusal Records
- limited resistance before setting to avoid displacing the teeth or mandible
during closure
- minimal dimensional change
- it should be easy to manipulate
- no adverse effects on the tissue involved in the recording procedures
- it should accurately record the incisal and occlusal surfaces of teeth
- it should be verifiable
- over clinically reasonable time periods, they must have solidity to retain the
shape and strength when dental casts are articulated
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