Interim Fixed Restorations Overview

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Questions and Answers

What biological requirement concerns protecting the pulp from irritation?

Color compatibility

Fracture protection

Maintaining alignment

Thermal, chemical, and physical irritation (correct)

Which of the following is NOT a mechanical requirement of interim fixed restorations?

Resist functional load

Resist thermal changes (correct)

Resist removal forces

Maintain interabutment alignment

Which type of temporary restoration is formed directly in the patient's mouth?

Tooth colored polycarbonate crown

Clear cellulose acetate crown form

Custom made temporary restoration (correct)

Prefabricated metal crowns

What aesthetic requirement pertains to areas visible during talking and smiling?

Psychological trauma avoidance Signup and view all the answers

What is a characteristic of extra-coronal restorations?

They include prefabricated crowns. Signup and view all the answers

Which of the following does NOT relate to the biological requirements of interim restorations?

Resisting removal forces Signup and view all the answers

What is the main function of interim restorations regarding esthetics?

Providing psychological comfort Signup and view all the answers

Which material is commonly used for prefabricated crowns?

Polycarbonate Signup and view all the answers

What is a requirement that an ideal provisional material should possess?

Convenient handling Signup and view all the answers

Which of the following provisional materials would be classified as a resin?

Poly-ethyl methacrylate resin Signup and view all the answers

Which characteristic would NOT typically be expected of an ideal provisional material?

Flammability Signup and view all the answers

What primary function does a temporary luting agent serve?

To provide a seal against marginal leakage Signup and view all the answers

Which technique is NOT used for the fabrication of custom-made temporary restorations?

Random technique Signup and view all the answers

What potential issue might arise from using a celluloid crown former?

Loss of proximal contact may occur Signup and view all the answers

What is a potential consequence of leaving a celluloid crown former in place after use?

Peeling away during function Signup and view all the answers

Which of the following provisional materials is NOT a resin?

Prefabricated polycarbonate crown Signup and view all the answers

Study Notes

Interim Fixed Restorations (Temporization)

Interim fixed restorations, also known as temporization, are temporary tooth replacements
They are used as a temporary solution until a permanent restoration can be placed
Requirements for interim fixed restorations include: materials, procedures, post and core interim restorations, and cementation

Characteristics of an Ideal Provisional Material

Convenient handling: Easy to work with
Biocompatibility: Safe for the patient's mouth
Dimensional stability: Maintains its shape and size
Ease of contouring and polishing: Easy to shape and smooth
Adequate strength: Strong enough to withstand normal biting forces
Acceptable appearance: Looks natural
Acceptability to patient: Comfortable for the patient
Ease of adding or repairing: Easy to fix if needed
Chemical compatibility with provisional luting agents: Compatibility with the temporary cement

Types of Temporary Restorations

Intra-coronal: Used for inlay preparation
Extra-coronal:
Custom-made acrylic resin crown and bridge
Prefabricated crowns

Materials for Temporary Restorations

Tooth-colored polycarbonate crown: A variety of shades available
Clear Cellulose Acetate crown form: A clear temporary crown shape
Prefabricated metal crowns: Including aluminum shell, aluminum anatomic, and stainless steel and Ni-chromium anatomic crowns

Custom Made Temporary Restoration

Formed directly in the patient's mouth or indirectly on the study cast
Application of temporary self-curing resin over fresh cut dentin can potentially irritate the pulp
Temporary restorations are usually safe due to short duration of contact

Temporary Cementation

Temporary luting agents primarily seal against marginal leakage, preventing the entry of oral fluids
Temporary cements should not be relied upon to support occlusal forces

Ideal Properties of Temporary Cement

Seals against leakage of oral fluids
Strength consistent with intentional removal
Low solubility
Obtundent effect on the pulp (to minimize irritation)
Chemical compatibility with resins used
Convenience of dispensing and mixing
Ease of eliminating excess
Adequate working time and short setting time

Materials for Temporary Cement

Zinc oxide-eugenol cements
Non-eugenol cements (ortho-methoxy phenol, ortho-ethoxy benzoic acid)

Fabrication of Custom Temporary Restorations

The Direct Technique involves forming directly in the mouth and creating directly on the cast
Indirect Technique involves fabrication on a study model and transferring to the mouth

Temporization of Endodontically Treated Teeth

Specific temporary restoration methods exist for endodontically treated teeth requiring specialized considerations

Temporization for Laminate Veneers

Temporary methods used for situations requiring laminate veneer temporary restoration.

Additional Steps for Cementation

Detailed steps of cementation for temporary restorations.

Tools for Provisional Trimming

A variety of specialized dental instruments, such as burrs and files.

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Description

This quiz focuses on interim fixed restorations, also known as temporization, which are temporary tooth replacements used until a permanent solution is available. It covers the characteristics of ideal provisional materials, their requirements, and procedures related to their placement and maintenance. Test your knowledge on this essential aspect of dental restoration!