Card Set Information
framework try-in app.
1. inspect (consult)
3. physiologic adjust (EXTENSION BASE)
4. occlusal adjust
5. altered cast impression (ext base only)
Pressure indicator made from:
Chloroform and rouge
Do not adjust ________ before consulting with an instructor.
adjust framework w/ high speed burs
UCLA functional design classifications
1. tooth borne
: abutment tooth borders edentulous, functional forces tranmitted through abutment
2. extension base
: distal or anterior extension, force thru abutment & MUCOSA to bone
Differential displacement (PDL vs. Mucosa)
axis of rotation through:
1. rest closest to extension base
2. farthest rest
Provide the RPD framework with physiologic relief to allow for its movement along the axis of rotation
masticatory forces vs. proximal plate/minor connector could bind teeth during RPD functional movements
Why physiologically adjust?
Establish a safety factor for abutment teeth to minimize the torquing or binding force due to
(1) the different compressive capacity of hard and soft support
(2) perspective bone resorption
Effective preventive measure to protect abutment teeth for long run!
How to physiolgically adjust?
The framework is placed in the mouth and moved in
hyperfunction by pressing the denture base connector in the extension area
Then, grind the high pressure areas.
Until the framework moves easily with
1) the rest at the axis of rotation rolling smoothly without lifting,
2) the I-bar moving forward slightly,
3) the abutment not being torqued. Be cautious to over-shave the metal or you will lose the retention and stability.
No more adjustments should be made when the metal reaches ____ mm thickness.
Adjustments are made to the framework (rests and minor connectors) until __________
1. natural teeth are in contact
2. no interference during excursive movements
Altered Cast Procedure
obtain the maximum support possible from the edentulous area of the extension partial denture
How to fabricate an altered cast tray
framework is placed on the master cast.
single layer of wax is placed over the edentulous area to provide a space for the impression material.
Remove some wax from the denture base connector area
to provide for the mechanical index of the tray acrylic to the metal.
Lubricate separating medium and apply the tray acrylic
The acrylic trays are trimmed and polished
Make 2-3mm space for border molding
Do not bond to the framework at this point.
The altered cast tray is connected to the framework using a thin layer of GC Pattern Resin or DuraLay after the physiologic adjustment is complete
Clinical steps of altered cast impression
1. checked proper peripheral extension in mouth
2. Border molding
3. cut back 1 mm for the impression material
4. Vent holes near the finish line
5. adhesive 2-3 mm exceeding the flange.
6. Mix and load
7. seat in the mouth ensuring COMPLETE SEATING
a. rests in the right positions
b. necessary movements of soft tissues. H
c. Do not hold the framework in the extension area only.
8. Inspect for smoothness, continuity, and void. 9. Trim these excessive impression material exactly at the metal finish line on the tissue surface.
1. remove edentulous area from master cast 1-2mm from tooth-tissue junction
2. seat framework
3. secure w sticky wax
4. confirm nothing stone touching impression
5. place retention grooves to hold altered areas
6. bead and box ready to pour vaccum-mixed stone
Materials for altered cast impression
Rubber base or metallic paste (ZOE) can be used.
Do not use ZOE for tissues with gross undercuts