Definitive (working/master) cast- what is it
Replica of prepped teeth, ridge areas, other parts of dental arch
Die- what is it
Positive reproduction of form of prepped tooth in any suitable substance
Requirements of working casts, dies
- Must be bubble free, esp along finish lines
- Must be free from distortion
- Working die must be removable but must return to exact position w/out
rotation
- Working dies must be trimmed to allow access for waxing instruments
- Working casts should be removable from its base
Most accurate method to occlude opposing casts
, By hand; no intervening bite registration material
When is interocclusal (bite) registration needed
If there is insufficient stability of casts for hand articulation
- When too many teeth missing, record base often required
Requirements for materials used for interocclusal records
- Limited resistance before setting (to avoid displacing teeth/mandible during
closure)
- Minimal dimensional change
- Easy to manipulate
- No adverse effects on tissues involved in recording procedures
- Accurately record incisal, occlusal surfaces of teeth
- Should be verifiable
- Over clinically reasonable time periods- must have solidity to retain shape,
strength when dental casts are articulated
How to prepare final impression
1. Trim lateral over-extension flush w/ custom tray
2. Trim vertical over-extension (pic)
-- Leave 5-8 mm vertical height from cervical margins of teeth
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