Outline General Introduction Introduction REQUIREMENTS CLASSIFICATION LIMITATIONS

1. Temporization OR Provisional
Restoration
By
Mohammed M. Nasser
Supervision
Dr. Mondale R. Hadi
Dr. Abbas M. Abbas

2. G. Introduction

3. Steps in FP construction
Diagnosis
1
Tooth Preparation
2
Impression
3
Temporary crown
4
Working model
5
Waxing
6
Investing
7
Wax Elimination
8
Casting
9
Finishing and
polishing
10
Cementation Of
the Crown
11

4. 2 3 4 5
6
10
9

5. Introduction

6. • After tooth preparation and Impression, a
temporary protective/ functional
restoration is fabricated over the prepared
tooth to be used until the fabrication of the
final prosthesis.
• Temporary restorations are usually
fabricated and provided on the same day of
tooth preparation. Before we go into the
fabrication of a provisional restoration.
Introduction

7. REQUIREMENTS

8. IDEAL REQUIREMENTS
Biological requirement
1
Mechanical requirement
2
Material requirement
3

9. • Protect the pulp.
• Maintain periodontal health.
• Good occlusal compatibility:
Tooth position should contact
with adjacent and opposing
teeth.
Biological requirement
1

10. Mechanical requirement
2
• Function
Distributed of occlusal forces.
Greater strength.
• No Displacement
Proper tooth preparation.
Closely adapted internal surface of provisional restoration.
• Removal for Reuse
The provisional restoration should not be damaged during
removal.
The luting agent should be sufficiently weak to allow removal.

11. Material requirement
3
• Good aesthetics.
• Convenient handling.
• Biocompatibility.
• Dimensionally stable during setting.
• Easy to contour and polish.
• Adequate strength and abrasion resistance.
• Good patient acceptance.
• It should be easy to repair or to add more material.
• Chemical compatibility with provisional luting
agents.

12. CLASSIFICATION

13. CLASSIFICATION OF
PROVISIONAL RESTORATIONS
based on Method of fabrication
1
based on Type of material used
2
based on Duration of use
3
based on Technique for fabrication
4

14. Classification of
PROVISIONAL
RESTORATIONS
Type of
material
used
Technique for
fabrication
Indirect
Direct
Duration of use
Method for
fabrication
Resin based Provisional R
• Cellulose acetate
• Polycarbonate
• Poly-methyl methacrylate.
• Poly-R methacrylate.
• Microfilled composite.
• Urethane di-methylacrylate.
Metal Provisional R
• Aluminium
• Nickel-chromium
• Tin-Silver
Short-term TR
Long-term TR
Direct-Indirect
custom made
preformed

15. based on Method of fabrication
1
• custom made (prefabricated).
• preformed restorations.

16. Custom Made Provisional R Preformed Provisional R
Notes • Restoration is fabricated to
reproduce the original
contours of the tooth.
• The prepared tooth on the
cast is waxed up and carved to
reproduce the original
contours.
• Commercially available.
• Found in various sizes and
materials, operator can choose
the size and material that
would best suit the patient.
• Before cementation these
crowns are slightly altered and
modified to fit the tooth.
Advantages • Minimum interference.
• A wide variety of materials
can be used.
• Helpful in evaluating the
adequacy of tooth reduction.
Less time.
Disadvantages • Additional lab procedure
involved.
• more Time.
• Rarely satisfies the
requirements of contour.
• Limited to single tooth
restorations.

17. 1) Resin based Provisional R:
• Cellulose acetate
• Polycarbonate
• Poly-methyl methacrylate.
• Poly-R methacrylate.
• Microfilled composite.
• Urethane di-methylacrylate.
2) Metal Provisional R:
• Aluminium
• Nickel-chromium
• Tin-Silver
based on Type of material used
2

18. Polycarbonate
Materials Available
• Natural appearance.
• Available in a single shade.
• Can be altered by the shade of the
luting agent.
• Available for Anterior & posterior
teeth.

19. Cellulose Acetate
Materials Available
• It is available as shells into which
auto-polymerising resin can be filled
and inserted over the prepared tooth.
As the resin does not bond to the shell,
it can be easily removed.
• It is a thin (0.2 to 0.3 mm),
transparent material.
• The shade of this temporary crown
depends entirely on the auto-
polymerising resin. Shade matching can
be done by adding colours to the resin.
• used in Anterior & Posterior teeth.

20. Aluminium and Tin-silver
Materials Available
• For posterior teeth.
• They have anatomically shaped
occlusal and axial surfaces.
• Care must be taken during try-in
verification to avoid fracture of their
delicate margins.
• As it is highly ductile, it allows easy
contouring.
• The crown may require cervical
enlargement during insertion. This can
be done using special instruments.

21. Nickel-Chromium
Materials Available
• Used for children with extensively
damaged primary teeth.
• Indicated for long-term temporaries.
• Very strong.
• They cannot be altered with resin.
• These crowns can be easily
recontoured using pliers.
• They should be cemented using high
strength luting agents.

22. based on Duration of use
3
A) Short-term temporary
Use up to 2 weeks.
B) Long-term temporary
2 weeks ---> few months.

23. Short-term temporary
A
• Two weeks maximum time.
• May be:
- custom-made: like resins.
- preformed crowns.
• Polycarbonates or aluminium
crowns are the most commonly used.

24. Long-term temporary
B
• Usually: cast metal.
• Have a history of frequent breakage; Though
their strength is more than average.
• Indications
- Long span posterior FPD.
- Prolonged treatment time.
- Patient is unable to avoid excessive
forces on the prosthesis.

25. based on Technique for fabrication
4
A) Direct technique.
B) Indirect technique.
C) direct- indirect technique.

26. Direct technique ANTERIOR POLYCARBONATE
Fig. 1

27. Direct technique ANTERIOR POLYCARBONATE
Fig. 2

28. Direct technique ANTERIOR POLYCARBONATE
Fig. 3

29. Fig. 4
Direct technique ANTERIOR POLYCARBONATE

30. Fig. 5
Direct technique ANTERIOR POLYCARBONATE

31. Fig. 6
Direct technique ANTERIOR POLYCARBONATE

32. Fig. 7
Direct technique ANTERIOR POLYCARBONATE

33. Fig. 8
Direct technique ANTERIOR POLYCARBONATE

34. Fig. 9
Direct technique ANTERIOR POLYCARBONATE

35. Fig. 10
Direct technique ANTERIOR POLYCARBONATE

36. Fig. 11
Direct technique ANTERIOR POLYCARBONATE

37. Fig. 12
Direct technique ANTERIOR POLYCARBONATE

38. Direct technique ANTERIOR POLYCARBONATE
Fig. 13

39. LIMITATIONS

40. • Lack of inherent strength:
Ex/
- placed over long-span ridges in
patients with bruxism.
- In cases with reduced inter-
occlusal clearance.
LIMITATIONS

41. • Poor marginal adaptation.
• Poor colour stability.
• Poor wear properties.
• Detectable odour.
• Inadequate bonding
characteristics.
LIMITATIONS

42. • Poor tissue response.
• Arduous cement removal.
• The temporary cement usually flows into
the proximal gingival cuff and into the
depth of the embrasure. Hence, during
removal of the temporary restoration, it is
difficult to completely remove the
temporary luting agent from these areas.
LIMITATIONS

43. References

44. THANK
YOU