temporization in fixed partial denture prosthodontics

temporization in fpd

1. TEMPORIZATION
OR
PROVISIONAL RESTORATION

2. 
“Provisional”- Established For Time Being, until a
Permanent Arrangement can be made.
After Tooth Preparation Temporary Protective or
Functional Restoration is Fabricated Over The Prepared
Tooth to be Used Until Fabrication Of Final Prosthesis.

3. IDEAL REQUIREMENTS OF PROVISIONAL RESTORATION

4. BIOLOGIC
REQUIREMENTS
PROVISIONAL RESTORATION SHOULD: -
•Protect the pulp because a freshly prepared tooth
will have increased sensitivity.
•Maintain periodontal health (good marginal fit).
•Be occlusal compatibility/harmony.
•Protect against fracture.

5. MECHANICAL
REQUIREMENTS
PROVISIONAL RESTORATION SHOULD: -
•Resist functional loads: -
It functions like a beam in which substantial occlusal forces can
be transmitted / distributed.
Greater strength is achieved by reducing the depth and sharpness
of embrasures.
•Resist removal forces: -
Restoration should not be damaged during removal.
The luting agent should be sufficiently weak to allow removal.
•Maintain inter-abutment alignment

6. ESTHETIC
REQUIREMENTS
PROVISIONAL RESTORATION SHOULD: -
•Be easily contourable.
•Be color compatible.
•Be translucent.
•Be color stable.

7. Material Requirements
Usually provisional restorative materials are of fluid consistency during fabrication, which
become rigid once the material is set.

8. INDICATION
•A Long Span or single unit anterior Fixed Partial Denture.
•Prolonged Treatment Time.
•Patient is Unable To Avoid Excessive Forces On The Prosthesis Above
Average Masticatory Muscle Strength.
•History Of Frequent Breakage.

9. LIMITATIONS

10. TYPES OF PROVISIONAL RESTORATION

12. CUSTOM MADE PROVISIONAL RESTORATION
This restoration is fabricated to reproduce the original contours
of the tooth
An impression of the prepared tooth is made and a cast is
poured
Prepared tooth on the cast is waxed up and carved to
Reproduce the original contours

13. CUSTOM MADE PROVISIONAL RESTORATION
Advantages:
Minimum interference.
A wide variety of material can be used.
Disadvantages:
Additional lab procedure involved.
Time Consuming.

14. PREFABRICATED PROVISIONAL RESTORATION
These are commercially available prefabricated crowns.
Available in various sizes.
Operator chooses the best one suit to the patient.
Before cementation these crowns are slightly altered and
modified to fit the tooth.

15. PREFABRICATED PROVISIONAL RESTORATION
Advantages:
Less time consuming.
Disadvantages:
Rarely satisfies the requirements of contour. It has to be customised with
self-cure resin.
Generally limited to single tooth restoration.

16. Has the most natural
appearance.
Usually available in single
shade.
It is a thin (0.2 – 0.3mm),
transparent material.
It is available in all tooth
types.
These are suitable for
posterior teeth.
They have anatomically
shaped occlusal and axial
surfaces.
These are used for
children with extensively
damaged primary teeth.
They cannot be altered
with resin.

17. 3. TYPE OF
MATERIAL
USED

18. These are used when the prosthesis is to be used
for a maximum of two weeks.
They are either custom made resins or available as
preformed crowns.
Polycarbonates or Aluminium crowns are the most
commonly used short term temporary restorations.
They are usually made of cast metal. Though their
strength is more than average.
Usually for long span posterior fixed partial
dentures.
During prolonged treatment time.
If the patient is unable to avoid excessive forces on
the prosthesis.

20. TECHNIQUES FOR CUSTOM MADE
PROVISIONAL RESTORATION

21. OVER-IMPRESSION FABRICATED PROVISIONAL CROWN
1. Commonly done with alginate impression material.
2. Over-impression can be made from the patients mouth or from
the diagnostic cast.
3. When the alginate has set over impression is removed and
checked for completeness.

22. 4. Thin flashes of impression material that replicate the gingival
crevice are removed to insure that no impediment to the
complete seating of the cast into the over-impression later.
5. Impression is then wrapped in a wet paper towel and placed
in a zip lock plastic bag for later use.

23. 6. When the tooth preparation is completed, another quadrant
impression is made with alginate.
7. This impression is then poured with a thin mix of quick setting
plaster.
8. Then try trimmed quick set plaster cast in the over-impression
to make sure that it will seat completely.

24. 9. Coat the prepared tooth and adjacent areas of the cast
liberally with a “tin foil substitute” separating medium.
10. Mix tooth coloured acrylic resin in a dappen-dish with a
cement spatula.
11. Place the resin in the over-impression so that it completely
fills the crown area of the tooth.

25. 12. Seat the cast into the over-impression. Making sure that the
teeth on the cast are accurately aligned with the tooth
impression.
13. Force used to seat the cast into the alginate impression is
critical. Excessive force can over-seat the cast and uneven force
can torque the cast.
14. Once the cast has been firmly seated hold the cast in place
with a large rubber band.

26. 15. Place the over-impression plaster cast assembly in a plaster
bowl full of hot tap water or approx. 5 min or into a pressure
pot under 20 psi.
16. When the resin has polymerised. Remove the rubber band to
disassemble it.
17. Finally the restoration is finished, polished and cemented.