Framework Flashcards
4 types of tissue blockout
- parallel blockout
- arbitrary blockout
- ledges
- 22 and 30 gauge relief
who is responsible for the design of the partial denture
YOU - the dentist
purpose of parallel block-out relief wax
protects the path
purpose of the arbitrary block-out relief wax
protects the TISSUE
purpose of the ledges block-out relief wax
for clasp location
purpose of the 22 and 30 gauge block-out relief wax
for ACRYLIC – (under mesh-work), approach arms and lingual major connectors
ledges are placed where for C clasp?
DIRECTLY UNDER the drawings - because when duplicated to refractory cast we do NOT have the drawings anymore so ledges will guide us to where they need to be
ledges are placed where for RPI clasp?
placed along SIDE of the drawing
tissue stop does what two major things
- only part of the distal extension meshwork that contacts the tissue
- the only part of the denture that predicts how accurately the acrylic will contact the tissue
position of the tissue stop?
always forward of the RMP
what do you use to make tissue stops
created with the 30 gauge wax
refractory cast?
DUPLICATE of the final cast
*final cast is duplicated in investment –> refractory cast
where is the wax up done on?
refractory cast
after wax up is done, next step?
the wax up is sprued, invested and cast
what is done and what is the order of these tasks prior to duplicating the final cast?
- DRAW design and frame-work on the final cast
- Parallel and arbitrary block-out is completed
(parallel = guide planes so PROTECTS PATH)
(Arbitrary = protects TISSUE) - ledges for clasps are waxed in
- relief for acrylic and metal is done
what is needed to make a tissue stop
a whole in the relief wax
what happens to whole in relief wax for tissue stop?
after casting –> converts this space into a POSITIVE metal stop in the framework
how you know partial is sitting well on mandible and maxilla?
Maxilla - Major connector *** because it also seats on the tissue + the TISSUE STOP
Mandible
- ONLY TISSUE STOP
- because major connector is not touching tissue like it does on the palate of the maxilla
where do you place maxillary tissue stops?
also placed in distal extension areas
- can decrease canteliver effects
altered cast impression technique cannot be used where?
NOT POSSIBLE on MAXILLARY frameworks
material used for final cast
poured with STONE
material used for refractory cast
poured in CASTING investment
describe the creation of the refractory cast
comprised of INVESTMENT
it is a DUPLICATE of the final cast with RELIEF WAX ADDED
sprue pin?
creates a pathway for the molten alloy to go into