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?

<p>Psychological trauma avoidance (A)</p> Signup and view all the answers

What is a characteristic of extra-coronal restorations?

<p>They include prefabricated crowns. (C)</p> Signup and view all the answers

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

<p>Resisting removal forces (B)</p> Signup and view all the answers

What is the main function of interim restorations regarding esthetics?

<p>Providing psychological comfort (C)</p> Signup and view all the answers

Which material is commonly used for prefabricated crowns?

<p>Polycarbonate (A)</p> Signup and view all the answers

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

<p>Convenient handling (D)</p> Signup and view all the answers

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

<p>Poly-ethyl methacrylate resin (D)</p> Signup and view all the answers

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

<p>Flammability (C)</p> Signup and view all the answers

What primary function does a temporary luting agent serve?

<p>To provide a seal against marginal leakage (C)</p> Signup and view all the answers

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

<p>Random technique (C)</p> Signup and view all the answers

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

<p>Loss of proximal contact may occur (C)</p> Signup and view all the answers

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

<p>Peeling away during function (D)</p> Signup and view all the answers

Which of the following provisional materials is NOT a resin?

<p>Prefabricated polycarbonate crown (A)</p> Signup and view all the answers

Flashcards

Interim Fixed Restorations

Temporary restorations used to protect prepared teeth while a permanent restoration is being made. They can be custom-made or prefabricated and are used to maintain tooth function, protect the pulp, and ensure esthetics.

Requirements for Interim Restorations: Biological

Interim restorations should protect the pulp from irritation, support the surrounding tissues, maintain proper occlusion and position, and prevent further damage to the prepared tooth.

Requirements for Interim Restorations: Mechanical

Interim restorations should be able to withstand functional forces, resist removal, maintain alignment, and prevent fracture of the prepared tooth.

Requirements for Interim Restorations: Esthetic

Interim restorations should blend in with the surrounding teeth, be easily contoured, and maintain their color over time. They should be translucent and have good color stability.

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Intra-coronal Restorations

Interim restorations that fit inside the crown of a tooth, often used after an inlay preparation. They are often made from materials like custom acrylic resin.

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Extra-coronal Restorations

Interim restorations that cover the entire external surface of the prepared tooth, such as crowns and bridges. These can be custom-made or prefabricated.

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Prefabricated Crowns

Pre-made temporary crowns that are available in various materials like polycarbonate, cellulose acetate, or metal. They are often selected based on the tooth's location and esthetic requirements.

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Custom Made Temporary Restoration

A temporary restoration that is individually created for each tooth, either directly in the patient's mouth or indirectly on a model. This allows greater control over the fit and esthetics.

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Pulpal Irritation

Applying self-curing resin directly to fresh dentin can irritate the pulp. Although the contact is short, it may cause sensitivity.

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Ideal Provisional Material

A temporary restoration should be easy to handle, biocompatible, dimensionally stable, easily contoured and polished, strong enough, aesthetically pleasing, patient-friendly, repairable, and compatible with the luting agent.

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Direct Technique

A method for creating custom temporary restorations where the material is applied directly onto the prepared tooth.

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Indirect Technique

A method for creating custom temporary restorations where the material is shaped outside the mouth and then placed on the prepared tooth.

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Cementations

The process of attaching a temporary restoration or interim fixed restoration to the tooth using a temporary luting agent.

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Temporary Cementation

The primary purpose of temporary cement is to prevent leakage around the margins of the restoration. It's not designed to resist occlusal forces.

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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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Interim Fixed Restorations PDF

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!

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