The document discusses interim restorations in dentistry, defining them as temporary prostheses that provide aesthetics, stabilization, and functionality until a permanent restoration is placed. It outlines the objectives, requirements, purposes, and materials used for interim restorations, emphasizing the importance of protection, aesthetics, and maintaining tooth position. Various materials for intracoronal and extracoronal preparations are described, as well as criteria for using crowns in specific cases.

1. INTERIM
RESTORATIONS
Presented by : Dr Safiullah malakzay
Department of endodontics and restorative
dentistry
Year : 2022

2. CONTENTS
introduction
Objectives of interim Restorations
Requirements of interim Restoration
Purposes of interim Restoration
Materials
For intracoronal Preparations
For Extracoronal Preparations

3. introduction
The word interim means established for the time being a
permanent restoration is placed. Whatever the intended
length of time of treatment, an interim restoration must be
able to maintain patient’s health.

4. definition
An interim restoration is a fixed or removable dental
prosthesis designed to enhance aesthetics, stabilization,
and/or function for a limited period of time, after which
it has to be replaced by definitive restoration/prosthesis

5. objectives of interim restorations
Maintain aesthetics
Act as space maintainer
◆
Allow the tooth to function
◆
Act as a diagnostic tool to determine occlusion
◆
Establish function and phonetics
◆
Allow the development of the gingival contour
◆
Seal and insulate the prepared tooth from the oral
◆
environment, thereby protecting the underlying pulp
Prevent passive tooth eruption and mesial drift.
◆

6. requirements of interim
restoration
◆ Have good marginal adaptation
Have optimal strength and durability
◆
Maintain physiologic contours and embrasures
◆
Have smooth plaque resistant surface
◆
Be able to satisfy mechanical, biological, and aesthetic
◆
criteria
Be economical
◆
Have easy and quick manipulation, placement, and
◆
removal
Be insoluble in oral fluids
◆
Be dimensionally stable
◆
Be sedative to pulp and periodontium
◆
Be aesthetically acceptable.
◆

7. PurPoses of interim restoration
◆ Protects the pulp by sealing and insulating the prepared
tooth from the oral environment
Sedative for hyperactive pulp due to tooth preparation
◆
Maintains tooth position and prevents occlusal changes
◆
Acts as an indirect pulp cap as it creates a favorable
◆
biological environment
Protects the gingival tissue inflammation
◆
Protects the tooth structure weakened during tooth
◆
preparation
Maintains the aesthetics
◆

8. MateriaLs
a. for intracoronal Preparation
b. b. for extracoronal Preparations

9. for intracoronal Preparation
1. Gutta-percha
2. Dental cements:
i. Zinc oxide-eugenol and its modifications
ii. Zinc phosphate cement
iii. Zinc silicophosphate cement
iv. Calcium hydroxide
v. Zinc polycarboxylate cement
vi. Glass ionomer cement

10. for extracoronal Preparations
Prefabricated crowns can be made from:
1. Tooth-colored polycarbonate crowns
2. Aluminium cylinder
3. Stainless steel crowns
4. Celluloid crowns
5. Indirect acrylic restorations

11. for intracoronaL PreParations
Gutta-Percha stick Interim Interim

12. Composition of Gutta-percha
Composition of Gutta-percha
Matrix—gutta-percha 20% (organic)
◆
Filler—zinc oxide 66% (inorganic)
◆
Radio-opacifiers—heavy metal sulfates 11% (inorganic)
◆
Plasticizers—waxes or resins 3% (organic)
◆

13. Advantages
◆ Compatibility allows it to easily adapt to preparation
walls
Inertness of this material makes it nonreactive
◆
Dimensionally stable
◆
Tissue tolerance
◆
Radiopacity makes it easily recognizable on radiograph
◆
Plasticity on heating helps it to mold according to
◆
preparation walls

15. Disadvantages
◆ Lack of rigidity
Easily displaced by pressure
◆
Lacks adhesive quality.
◆

16. Dental cements
Zinc oxide-eugenol Cement

18. Ethoxybenzoic Acid (EBA) Reinforced Cement

19. Polymer Reinforced Zinc oxide-eugenol Cement

20. For extracoronaL PreParations
Various types of prefabricated crowns are available
(made of plastic or metal), along with self-cured or light-
cured resins for extracoronal preparations. Crown forms
in anatomic shapes are most useful because of their
simulation to the tooth structure.

21. Crown forms
Crown forms are indicated in the following cases:
Extensive carious lesions undermining the cusps
◆
Failure to use other available restorative materials
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Following pulpotomy or pulpectomy
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For fractured teeth.
◆

22. Criteria of Using Crowns
Criteria of Using Crowns
◆ Surface of crown should be smooth and polished
Crown margins should be closely adapted to the tooth
◆
Contact with adjacent teeth should be proper
◆
Crown should be in proper occlusion
◆
Crown should facilitate the patient to adequately
◆
maintain oral hygiene

23. References
• Operative dentistry Nisha Garg and Amit Garg
• Internet