week 6 Flashcards
laboratory procedures for processing dentures
1) READ THE PRE CLASS ASSIGNMENT
denture base wax contours
1) reproduce and replace missing structures
2) base contours occupy a neutral zone
3) permit esthetic and natural presentation of the artificial teeth
4) prosthesis structural integrity
5) promote prosthesis cleanliness
generic wax up
1) smooth and get all the wax off the teeth
2) no more remnants of wax rim
3) teeth uncovered lingually and buccally
4) mandibular lingual flange has slight concavity
5) slight concavity on buccal too
6) gingival contour, root anatomy
7) sear pits
stippling
1) make some undulations in the wax so that it is not a slick piece of acrylic
2) not needed
acrylic resin is a
1) clear glassy solid with excellent chemical stability, low toxicity and inexpensive, with forgiving fabrication
2) PMMA
3) plexiglass, exothermic reaction
4) mix 1:3 liquid to solid to make doughy
- compress it in a flask at a pressure of 3500 psi
residual monomet
2) remains unreacted 0.2-0.5% in heat cured resin
- 3-5% in chemically cured
4) RM affects mechanical properties and can be irritant
finish
1) case resins bone to reline repair acrylics
2) high polish, hygineic
3) must have minimum bulk for strength
5) be cautious for polishing not to overheat and warp it
absorb water
1) when not wearing, it needs to be humid
acrylic processing
1) flasking
2) boiling out
3) processing
flask
set lower denture on master cast
2) put it in the flask
3) first pour of stone to embed master cast
4) clean periphery
5) paint separator
6) bury in stone
7) third separting medium, and another pour
8) take out and drill holes in teeth
9) press it in and use hydraulic press
10) heat and cool, then remove
11) polish
digital dentures
1) difficult to scan oral soft tissues
2) so analog impressions taken, then scanned
final occlusal adjustment
1) maintain centric contacts in black
2) use red for excursions
3) adjust lingual inclines upper buccal and buccal inclines lower lingual cusps
