A provisional restoration is a temporary prosthesis used to enhance esthetics, stabilization, and function for a limited time period until being replaced by a definitive prosthesis, and must meet biologic, mechanical, and esthetic requirements to protect pulp, maintain periodontal health, provide functional occlusion, and resemble natural teeth. Provisional restorations can be preformed custom crown shells or customized resin restorations made using direct, indirect, or combination techniques with various acrylic resin materials that must be biocompatible, dimensionally stable, easy to contour and repair, and compatible with luting agents.
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Provisional restoration
1. Definition
A fixed prosthesis, designed to enhance
Esthetics, stabilization and/or function for a
limited period of time, after which it is to be
replaced by a definitive prosthesis. Often such
prostheses are used to assist in determination of
the therapeutic effectiveness of a specific
treatment plan or the form and function of the
planned for definitive prosthesis
3. Requirements of Provisional
Restoration
I.
Biologic requirement:
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•
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Protect the dental pulp
Maintain and contribute to the periodontal health
Provide comfortable, functional occlusal relationship
Maintain tooth position
Protect remaining tooth structure
10. Types of Provisional
Restoration
I.
II.
Preformed custom crown shells
Customized resin restorations
1.
Direct technique
a.
Direct matrix-assisted
•
•
b.
2.
3.
Elastomeric or alginate impression
Vacuum formed plastic template
Direct custom-carved (block-temporary)
Indirect technique
Indirect-direct (combination) technique
11. Types of Provisional
Restoration
I.
Preformed custom crown shells
•
•
Cellulose acetate crown forms
Polycarbonate crown forms
• Anatomic metal crowns
• Acrylic resin shells
12.
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15. Types of Provisional
Restoration
I.
II.
Preformed custom crown shells
Customized resin restorations
1.
Direct technique
a.
Direct matrix-assisted
•
•
b.
2.
3.
Elastomeric or alginate impression
Vacuum formed plastic template
Direct custom-carved (block-temporary)
Indirect technique
Indirect-direct (combination) technique
16. Types of Provisional
Restoration
II. Customized resin restorations
1.
Direct technique
•
•
Initial polymerization occurs intraorally
Final polymerization occurs extraorally
17. Types of Provisional
Restoration
II. Customized resin restorations
1.
Direct technique
a.
Direct matrix-assisted
•
•
Elastomeric or alginate impression
Vacuum formed plastic template
18.
19. Types of Provisional
Restoration
I.
II.
Preformed custom crown shells
Customized resin restorations
1.
Direct technique
a.
Direct matrix-assisted
•
•
b.
2.
3.
Elastomeric or alginate impression
Vacuum formed plastic template
Direct custom-carved (block-temporary)
Indirect technique
Indirect-direct (combination) technique
26. Types of Provisional
Restoration
II. Customized resin restorations
1.
Direct technique
Disadvantages:
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•
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•
Adverse pulpal or soft tissue reaction to monomer and
increased temperature
Allergic reaction
Locking of restoration into undercuts
Consuming chair time
27. Types of Provisional
Restoration
II. Customized resin restorations
1.
Direct technique
Avoiding potential problems
•
•
•
•
Remove provisional restoration from teeth while in
plastic stage
Allow final polymerization to occur extraorally
Use water coolant
Use reline technique
28. Types of Provisional
Restoration
I.
II.
Preformed custom crown shells
Customized resin restorations
1.
Direct technique
a.
Direct matrix-assisted
•
•
b.
2.
3.
Elastomeric or alginate impression
Vacuum formed plastic template
Direct custom-carved (block-temporary)
Indirect technique
Indirect-direct (combination) technique
29. Types of Provisional
Restoration
II. Customized resin restorations
2.
Indirect technique
•
•
Initial and final polymerizations occur extraorally
The first step is preparing a index (e.g. vacuum
shell) on study cast prior to tooth preparation visit
30.
31.
32.
33. Types of Provisional
Restoration
II. Customized resin restorations
2.
Indirect technique
Advantages:
1. Improved marginal accuracy
2. Prevention of pulpal and soft tissue irritation
3. Reduced chair time
4. More comfortable for patient
35. Types of Provisional
Restoration
I.
II.
Preformed custom crown shells
Customized resin restorations
1.
Direct technique
a.
Direct matrix-assisted
•
•
b.
2.
3.
Elastomeric or alginate impression
Vacuum formed plastic template
Direct custom-carved (block-temporary)
Indirect technique
Indirect-direct (combination) technique
36. Types of Provisional
Restoration
II. Customized resin restorations
3. Indirect-direct (combination) technique
1.
2.
Indirect: polymerization of acrylic resin on mock
preparation of teeth
Direct: reline is performed intraorally
37.
38.
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41. Types of Provisional
Restoration
II. Customized resin restorations
3. Indirect-direct (combination) technique
1.
2.
3.
4.
5.
6.
7.
Advantages:
Allows trial of esthetics, function and speech
Provides template for the definitive restoration
Ensures color stability
Allows incorporation of reinforcement
Saves chair time
Permits removal and immediate replacement of nonsalvageable teeth
Permits long-term treatment