E2/Q2: Lect 7 Master Cast & Die Prep Flashcards
The Pindex system consists of: a special ____ press
brass _____ and plastic _____
drill…dowels…sleeves
The impression is poured in stone, separated when set, and trimmed to a horseshoe shape. The base must be
absolutely _____
FLAT
*“IMPORTANT”-Dr.P…. how much stone do you need from the cervical part of the tooth to the bottom of the pour up?
15.0 mm (need enough room for the length of the pins)
The location of each dowel is marked on the occlusal surface. ____ dowels are needed to stabilize each segment.
Two
When cutting your die out of the stone you need to use a saw blade. How thick is it?
JAMES BOND–>0.007” or 0.010”
Ok, Die is cut out now use large ______ to round die base into a cylindrical shape. Approach the margin, but avoid touching it.
E-cutter
Use a _______ with a #25 blade to trim those areas too close to the margin for an E-cutter
bard parker
Mark the margins with a ________ pencil. Margins must be clear, crisp, definable and undamaged.
NON graphite
The marked margins can be coated with low-viscosity ________ resin and immediately blown dry…If performed properly, this procedure adds no more than a ______ to the die…This aids in preservation of the line as well as helping to prevent damage to the die margin.
cyanoacrylate… micrometer
_______: This material is applied to the die to increase space between axial walls of the prepared tooth and the restoration….For adequate marginal adaptation, a band of about ___mm immediately adjacent to the preparation margin must be left UNPAINTED.
Die Spacer.. 1 mm
You want a TOTAL of ___ to ___ microns of die spacer added. Each coat is approx ____ microns.
35-45 micrometers….one coat is approx 13 micrometers
_________: The name given to all wax used in forming the pattern for cast restorations
Inlay Casting Wax
IMPORTANTE!!! What are the 4 components of inlay casting wax? What is the function of each?
- Paraffin (40-60%) 2.Dammar Resin(reduce flaking) 3.Carnauba/ceresin/candelilla/beeswax (to raise melting temp) 4.Dyes (color contrast)
Wax Categories: ______ A medium-hardness wax (generally used with the direct technique for making wax patterns in the oral cavity)
Type I
Wax Categories:______ A softer wax (generally used for the indirect fabrication of castings)
Type II
BEFORE YOU START WAXING _______ THE DIE
LUBRICATE
What power magnification is practical and helpful when evaluating the wax coping?
Ten power magnification is practical and helpful.
Say whaaa? Evaluate the buccolingual dimension with a _____ gauge. This instrument is also helpful in assessing axial shape and height of contour
Boley…where the f is ours?
Each contact area has _____ embrasures
4 (gingival, buccal, lingual, and occlusal)
Dr. P guaranteed to have one of these questions on Monday’s Quiz*The anteroposterior curvature of the maxillary and mandibular occlusal surfaces.
Curve of Spee
Dr. P guaranteed to have one of these questions on Monday’s Quiz*The mediolateral curvature of the maxillary and mandibular occlusal surfaces.
Curve of Wilson
When working on the occlusion: After each addition of wax, check the occlusal ______ by closing articulator.
contact
Give each cusp a triangular ridge that runs toward the center of the occlusal surface. The apex at the ______ and the base in the center of the ______ surface.
cusp tip..occlusal
Make ____ secondary or supplemental ridges adjacent to each triangular ridge
2
Occlusal contact are evaluated by dusting with ____ stearate or powdered wax
zinc
Final Wax Evaluation: Pattern must be very _____ and YOU MUST _____ THE MARGINS
smooth…RE-FLOW
