beading and boxing Flashcards
beading creates?
the land
Boxing creates?
the base
where to start the beading?
3mm from the top
so 3mm BELOW THE HEIGHT OF THE BORDER following its contour
width of beading?
3mm and should be visible around impression
what do you preserve in lower beading?
beading the lower impression requires perserving the posterior segments
application of boxing wax?
warmed and added at RIGHT ANGLE to the beading wax - at a HEIGHT of 1 inch above the highest point of the impression
underside surface of beading and boxing?
lute together and seal the edges of the boxing wax where they meet
FULL WIDTH of the beading wax must still be visible around the entire impression to:
- PRESERVE THE BORDER
2. DEVELOP THE LAND
wax spacer with holes?
holes are for tissue stops
spacer if using upper for PVS
base of cast must be parallel to?
the horizontal ridge
shape of fold?
shape of border?
Fold - concave
Border - convex
how do you conserve the retromolar pad area?
double strip of BEADING WAX in the posterior will allow the second layer to be turned up at a 90 degree angle in order to preserve the RETROMOLAR pad area
what do you do in tongue area?
a ‘tongue’ is added using boxing wax to preserve the lingual border and add strength to the final cast
orientation of the mandibular impression before boxing
propped up so that the mid portion is parallel to the table (ridge parallel to base) and PERPENDICUALR to the rear of the cast
when pouring what is the ratio of powder to liquid
3:1
what is the only aspect that should contact the vibrator?
HANDLE (not the wax – it will separate)
how to prevent air bubbles/ air traps when pouring
fill from one corner and vibrate the plaster forward in a circular pattern
how much do you fill base?
approx. 1/2 inch thickness
how long do you have to separate impression?
steps?
within 20 minutes if alginate
remove all beading and boxing and then summerse entire cast in HOT water until the compound softens - then carefully separate
goals/ measurements of trimming?
create a 3mm wide land and create a 1cm (1/2 inch) thick base
if over trim – you could have missing folds in your cast
if too thick of base – will not fit in the processing flask
what do you trim first? second?
base to 1 cm (1/2 inch thicknes which is also 10mm)
then side of land to 3mm
