Provisional restoration

12,073 views

Published on

Introduction to Fixed Prosthodontics
Forth Year

0 Comments
36 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
12,073
On SlideShare
0
From Embeds
0
Number of Embeds
12
Actions
Shares
0
Downloads
0
Comments
0
Likes
36
Embeds 0
No embeds

No notes for slide

Provisional restoration

  1. 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
  2. 2. Requirements of Provisional Restoration I. Biologic requirement II. Mechanical requirement III. Esthetic requirement
  3. 3. Requirements of Provisional Restoration I. Biologic requirement: • • • • • Protect the dental pulp Maintain and contribute to the periodontal health Provide comfortable, functional occlusal relationship Maintain tooth position Protect remaining tooth structure
  4. 4. After 1 week After 2 months
  5. 5. Requirements of Provisional Restoration II. Mechanical requirement: – – Resist functional load Resist removal forces without fracturing
  6. 6. Requirements of Provisional Restoration III. Esthetic requirement: – – Resemble natural teeth Color stability
  7. 7. 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
  8. 8. Types of Provisional Restoration I. Preformed custom crown shells • • Cellulose acetate crown forms Polycarbonate crown forms • Anatomic metal crowns • Acrylic resin shells
  9. 9. 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
  10. 10. Types of Provisional Restoration II. Customized resin restorations 1. Direct technique • • Initial polymerization occurs intraorally Final polymerization occurs extraorally
  11. 11. Types of Provisional Restoration II. Customized resin restorations 1. Direct technique a. Direct matrix-assisted • • Elastomeric or alginate impression Vacuum formed plastic template
  12. 12. 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
  13. 13. Types of Provisional Restoration II. Customized resin restorations 1. Direct technique b. Direct custom-carved (block-temporary)
  14. 14. Types of Provisional Restoration II. Customized resin restorations 1. Direct technique Disadvantages: • • • • Adverse pulpal or soft tissue reaction to monomer and increased temperature Allergic reaction Locking of restoration into undercuts Consuming chair time
  15. 15. 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
  16. 16. 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
  17. 17. 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
  18. 18. 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
  19. 19. Types of Provisional Restoration II. Customized resin restorations 2. Indirect technique Disadvantages: 1. Laboratory procedure required 2. Dental auxiliary required
  20. 20. 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
  21. 21. 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
  22. 22. 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
  23. 23. Endodontically treated tooth
  24. 24. Materials for Provisional Restoration • • • • Poly Methyl MethAcrylate (PMMA) Poly Ethyl MethAcrylate (PEMA) Bis-GMA Light Polymerized UDMA
  25. 25. Materials for Provisional Restoration • Ideal requirement of provisional restorative material: – – – – – – – – Biocompatible Dimensionally stable Ease of contouring Adequate strength and abrasion resistance Good appearance Good patient acceptance Ease of adding and repair Compatible with provisional luting agents
  26. 26. Provisional Restoration • Cementation – Properties of provisional cement
  27. 27. Provisional Restoration REFERNCE Contemporary of Fixed Prosthodontics, 3rd edition (Chapter 15)

×