Interim Fixed Restorations Overview
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Questions and Answers

What is an essential requirement for pulp health in interim fixed restorations?

  • Enhance interabutment alignment
  • Resist functional load
  • Prevent thermal and chemical irritation (correct)
  • Maintain esthetic color stability

Which property ensures that an interim fixed restoration maintains its position in the mouth?

  • Fracture resistance
  • Translucency
  • Color compatibility
  • Resistance to removal forces (correct)

Which of the following is a type of extra-coronal restoration?

  • Inlay prep restoration
  • Custom made acrylic resin crown (correct)
  • Indirect core restoration
  • Intra-coronal restoration

What is a characteristic of esthetic requirements in interim fixed restorations?

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

What function does the periodontium serve in the context of interim fixed restorations?

<p>Enhances oral hygiene procedures (A)</p> Signup and view all the answers

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

<p>Prevent thermal irritation (D)</p> Signup and view all the answers

What is the purpose of providing interim restorations in areas visible during talking and smiling?

<p>Prevent psychological trauma (D)</p> Signup and view all the answers

Which of the following statements is true regarding the custom made temporary restoration?

<p>It is formed either directly or indirectly. (A)</p> Signup and view all the answers

What is a primary function of a temporary luting agent?

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

Which characteristic is NOT considered a feature of an ideal provisional material?

<p>Low cost (B)</p> Signup and view all the answers

What may occur if temporary self-curing resin is applied over fresh cut dentin?

<p>Pulpal irritation (B)</p> Signup and view all the answers

What technique involves the use of prefabricated cellulose acetate crown forms?

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

Which of the following materials is NOT listed as a currently available provisional material?

<p>Glass ionomer cement (B)</p> Signup and view all the answers

What is typically the consequence of leaving a celluloid crown former in place during restoration?

<p>Loss of contact during function (C)</p> Signup and view all the answers

What is NOT an acceptable characteristic of provisional materials?

<p>Weak structural integrity (D)</p> Signup and view all the answers

Which temporary restoration is specifically indicated for an endodontically treated tooth?

<p>Post and core restoration (C)</p> Signup and view all the answers

Flashcards

Interim Fixed Restorations

Temporary restorations used to protect and restore teeth during the time between preparing the tooth and receiving a permanent restoration. They are mainly used after teeth have been prepared for inlays, crowns, or bridges. They maintain the tooth's function, shape, and aesthetics during the treatment process.

Requirements for Interim Restorations

These temporary restorations should fulfill a number of requirements, including: protecting the pulp from irritation, ensuring the periodontal tissues remain healthy, maintaining proper occlusion and tooth position, protecting the tooth from fracture, and presenting an aesthetically pleasing appearance.

Biological Requirements

These requirements focus on protecting and supporting the living tissues of the tooth. They involve protecting the pulp from irritation, maintaining healthy periodontal tissues, maintaining proper occlusion and position to avoid discomfort, and protecting the tooth from fracture.

Mechanical Requirements

These requirements focus on the physical aspects of the restoration and how it interacts with the tooth and its surroundings. They include resisting functional loads, resisting removal forces, maintaining interabutment alignment, and ensuring the restoration is easily contourable.

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Esthetic Requirements

These requirements focus on the visual appearance of the restoration. They ensure that the restoration is easily contourable, has good color compatibility, proper translucency, and color stability. This is especially important for restorations in visible areas.

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Intra-Coronal Restorations

This type of restoration is designed to be placed inside the crown of the tooth. It is typically used for inlays where a portion of the tooth structure within the crown is missing.

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Extra-Coronal Restorations

This type of restoration covers the entire tooth crown and extends beyond the tooth. They are commonly used for crowns and bridges.

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Custom Made Temporary Restoration

A temporary restoration created specifically for a particular tooth. This can be done either directly in the patient's mouth (direct technique) or indirectly by creating a mold of the tooth and fabricating the restoration in a lab (indirect technique).

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What is the concern with applying self-curing resin directly on fresh dentin?

Application of temporary self-curing resin on fresh dentin can irritate the pulp due to chemical reaction.

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What are the characteristics of an ideal provisional material?

An ideal provisional material should be easy to handle, biocompatible, dimensionally stable, easy to contour and polish, strong enough, aesthetically pleasing, easily repaired, compatible with luting agents, and acceptable to the patient.

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What are the common types of provisional materials?

Common provisional materials include poly-methyl methacrylate resin, poly-ethyl methacrylate resin, microfilled composite resins with auto mix delivery system, light-cured microfilled resins.

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What are the different techniques used to fabricate custom-made temporary restorations?

Custom-made temporary restorations can be fabricated using direct, indirect, or indirect-direct techniques.

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How are prefabricated temporary crowns used?

Prefabricated temporary crowns are pre-made crowns that are selected and adjusted to fit the prepared tooth.

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Define interim fixed restorations.

Interim fixed restorations are temporary restorations that are placed while the final restoration is being fabricated. They play a role in maintaining the function and aesthetics of the tooth during the restoration process.

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What are the requirements for temporary cementation?

Temporary cementation requires materials and procedures. The primary function of the temporary luting agent is to provide a seal against marginal leakage, but it should not be relied upon to resist occlusal forces.

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What are the common types of interim fixed restorations?

Common types of interim fixed restorations include post and core interim restorations, temporary restorations for endodontically treated teeth, and temporization of laminate veneers.

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Study Notes

Interim Fixed Restorations (Temporization)

  • Interim fixed restorations are temporary restorations used until a permanent restoration can be placed
  • They serve as temporary replacements for missing or damaged teeth
  • Interim restorations are designed to be biologically, mechanically, and esthetically acceptable
  • Key requirements are: materials and procedures, post and core interim restorations, and cementations

Biological Considerations

  • Pulp protection: temporary restorations should protect the pulp from thermal, chemical, and physical irritation
  • Periodontal health: the restoration should not harm the periodontium and support good oral hygiene practices
  • Occlusal and position: maintenance of proper proximal contacts and occlusal harmony is critical
  • Fracture prevention: the temporary restoration must protect the prepared tooth from potential fracture

Mechanical Considerations

  • Resistance to functional load: the restoration must withstand the forces applied during chewing and speaking
  • Resistance to removal force: the restoration should not dislodge easily
  • Alignment: proper alignment of the teeth is maintained for a comfortable and functional bite

Esthetic Considerations

  • Easily contourable: the restoration should adapt to the shape of the surrounding teeth
  • Color compatibility: the temporary restoration should match the color of the natural teeth
  • Translucency: the restoration should allow light to pass through it, giving it a natural appearance
  • Color stability: the restoration's color should not change over time

Types of Temporary Restorations

  • Intra-coronal: used for inlay preparations
  • Extra-coronal:
    • Custom-made acrylic resin crowns and bridges
    • Prefabricated metal crowns (e.g., aluminum shell, aluminum anatomic, stainless steel, Ni-chromium anatomic)
    • Tooth-colored polycarbonate crowns
    • Clear cellulose acetate crowns

Custom Made Temporary Restorations

  • Direct Technique: Formed directly in the patient’s mouth
  • Indirect Technique: Formed on a cast
  • Application of self-curing resin may irritate the pulp

Characteristics of an Ideal Provisional Material

  • Convenient handling
  • Biocompatibility
  • Dimensional stability
  • Ease of contouring and polishing
  • Adequate strength
  • Acceptable appearance
  • Acceptability to patient
  • Ease of adding or repairing
  • Chemical compatibility with provisional luting agents

Currently Available Provisional Materials

  • Poly-methyl methacrylate resin
  • Poly-ethyl methacrylate resin
  • Microfilled composite resins (with AutoMix delivery system)
  • Light-cured microfilled resins

Fabrication of Custom Made Temporary Restorations

  • Direct technique: illustrates steps in creating the restoration directly within the mouth

Temporary Cementation

  • Primary function: to seal the restoration to prevent marginal leakage and protect the tooth from harm

Ideal Properties of Temporary Luting Agents

  • Seals against leakage of oral fluids
  • Adequate strength – consistent with intentional removal
  • Low solubility
  • Obtundent effect on the pulp
  • Chemical compatibility with resins used
  • Convenient dispensing and mixing
  • Ease of eliminating excess
  • Adequate working time and short setting time

Materials for Temporary Cementation

  • Zinc oxide–eugenol cements (generally the most satisfactory)
  • Non-eugenol cements (using ortho-methoxy phenol, ortho-ethoxy benzoic acid, etc., as liquid components)

Steps of Cementation

  • Detailed descriptions and images illustrating the steps in cementation procedures

Temporary Restoration for Endodontically Treated Teeth

  • Methods and procedures specific to endodontically treated teeth are addressed.

Temporization of Laminate Veneers

  • Specific methods and techniques for temporary restorations when using laminate veneers are shown.

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Interim Fixed Restorations PDF

Description

This quiz covers the essentials of interim fixed restorations, focusing on their biological and mechanical considerations. Learn about the key requirements for these temporary restorations, including pulp protection and occlusal harmony. Test your knowledge on the materials and procedures used in interim restorations.

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