Posterior Provisional FPD & Tooth preparation UPDATED
ACTUAL Questions and CORRECT Answers
Requirements of Ideal posterior provisional FPD: -Pulpal protection
-Positional stability (should not extrude/ drift teeth)
-Resist removable forces (reused if needed)
-Resist functional loads
-Occlusal function
-Easy oral hygiene (contour that allows easy cleaning/ flossing)
-Smooth margins
-Strength & retention
-Esthetics
Explain how a good provisional FPD provides pulpal -made of material that prevents conduction of temperature extremes
protection: -Margins are well-adapted to finish lines to prevent dentin exposure & sensitivity
Integrity material is a ___________ type of resin. Bis-Acryl composite
The powder & liquid we use to make provisional in sim lab PMMA (polymethyl methacrylate)
is __________ type of resin.
Advantages & Disadvantages of PMMA resins:
(e.g. Jet)
Name 3 types of Prefabricated restorations : 1. Anatomical metal crown forms
2. Polycarbonate crown form
3. Clear celluloid shells
Synonyms of provisional restoration: -Interim prosthesis
-provisional prosthesis
An inflammation resulting from provisional's margin -Hypertrophy
impinging upon gingival tissue can cause _________ , -Gingival recession
________________, and ____________. -Hemorrhage
, (T/F) Resin provisional restorations are made with slightly True
more bulk than in the final cast restoration.
Why do you want the provisional to be bulkier than final For Strength & durability
restoration ? -Resins used for provisional is WEAK compared to metals used to make final
restoration
Which areas of provisional FPD is the extra bulk added? -in connectors
-throughout axial surfaces of retainers
-areas approaching margins
(T/F) Smooth and regular margins of FPD provisional True
promote gingival tissue recovery from preparation trauma
and impression procedures.
When preparing a temporary restoration for re- Margin damage
cementation, care is taken to prevent _____________________
during cement removal.
When you need to remove the existing cement to get Temporary-cement solvent used in an ultrasonic cleaner
ready for re-cementation of a provisional, the BEST
approach to dissolve away the cement is with
______________________.
3 techniques of provisional FPD fabrication: Direct:
-completely made in the mouth
-time-consuming & difficult
Indirect:
-Require a cast of prepared teeth
Indirect-Direct:
-provisional made in 2-steps (indirect (lab) step + direct step)
-enables fabricating provisional before patient's preparation appointment
Using (Direct/ indirect/ indirect-direct) technique requires Indirect-direct
preparation of abutment teeth on the cast.
(Direct/ indirect/ indirect-direct) technique offers the Indirect-direct
advantage of fabricating majority of provisional FPD
prior to actual tooth preparation, thus saving chair-side
time.
List disadvantages of Indirect-direct technique: -Freshly-cut dentin may be chemically stimulated → pulp may negatively respond to
exothermic reaction of setting resin
-provisional restoration may "lock in place" if undercuts exist
Whenever possible, technicians ______a fixed partial Cast
denture in one piece. If a misfit is detected afterward, the
FPD is cut and the pieces are rejoined via _________into Solder or laser welding
a new, better-fitting appliance.
ACTUAL Questions and CORRECT Answers
Requirements of Ideal posterior provisional FPD: -Pulpal protection
-Positional stability (should not extrude/ drift teeth)
-Resist removable forces (reused if needed)
-Resist functional loads
-Occlusal function
-Easy oral hygiene (contour that allows easy cleaning/ flossing)
-Smooth margins
-Strength & retention
-Esthetics
Explain how a good provisional FPD provides pulpal -made of material that prevents conduction of temperature extremes
protection: -Margins are well-adapted to finish lines to prevent dentin exposure & sensitivity
Integrity material is a ___________ type of resin. Bis-Acryl composite
The powder & liquid we use to make provisional in sim lab PMMA (polymethyl methacrylate)
is __________ type of resin.
Advantages & Disadvantages of PMMA resins:
(e.g. Jet)
Name 3 types of Prefabricated restorations : 1. Anatomical metal crown forms
2. Polycarbonate crown form
3. Clear celluloid shells
Synonyms of provisional restoration: -Interim prosthesis
-provisional prosthesis
An inflammation resulting from provisional's margin -Hypertrophy
impinging upon gingival tissue can cause _________ , -Gingival recession
________________, and ____________. -Hemorrhage
, (T/F) Resin provisional restorations are made with slightly True
more bulk than in the final cast restoration.
Why do you want the provisional to be bulkier than final For Strength & durability
restoration ? -Resins used for provisional is WEAK compared to metals used to make final
restoration
Which areas of provisional FPD is the extra bulk added? -in connectors
-throughout axial surfaces of retainers
-areas approaching margins
(T/F) Smooth and regular margins of FPD provisional True
promote gingival tissue recovery from preparation trauma
and impression procedures.
When preparing a temporary restoration for re- Margin damage
cementation, care is taken to prevent _____________________
during cement removal.
When you need to remove the existing cement to get Temporary-cement solvent used in an ultrasonic cleaner
ready for re-cementation of a provisional, the BEST
approach to dissolve away the cement is with
______________________.
3 techniques of provisional FPD fabrication: Direct:
-completely made in the mouth
-time-consuming & difficult
Indirect:
-Require a cast of prepared teeth
Indirect-Direct:
-provisional made in 2-steps (indirect (lab) step + direct step)
-enables fabricating provisional before patient's preparation appointment
Using (Direct/ indirect/ indirect-direct) technique requires Indirect-direct
preparation of abutment teeth on the cast.
(Direct/ indirect/ indirect-direct) technique offers the Indirect-direct
advantage of fabricating majority of provisional FPD
prior to actual tooth preparation, thus saving chair-side
time.
List disadvantages of Indirect-direct technique: -Freshly-cut dentin may be chemically stimulated → pulp may negatively respond to
exothermic reaction of setting resin
-provisional restoration may "lock in place" if undercuts exist
Whenever possible, technicians ______a fixed partial Cast
denture in one piece. If a misfit is detected afterward, the
FPD is cut and the pieces are rejoined via _________into Solder or laser welding
a new, better-fitting appliance.
