Endodontics Core Materials Quiz
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Questions and Answers

What indicates that extraction may be the best treatment choice?

  • The root filling material cannot be removed
  • The post remains very short
  • The post is too long
  • The tooth’s prognosis is poor (correct)

Which method uses heat to assist in the removal of root filling material?

  • Chemical dissolution
  • Thermal removal (correct)
  • Ultrasonic techniques
  • Mechanical removal

What must be chosen before canal enlargement?

  • Type of filling material
  • Type of post system (correct)
  • Type of irrigation solution
  • Type of anesthesia

What is a significant advantage of self-adhesive resin cements over conventional resin-based luting cements?

<p>No need for a bonding agent (B)</p> Signup and view all the answers

In custom made post construction, which technique is primarily used?

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

What should be done to the coronal tooth structure before post space preparation?

<p>Ignore any missing tooth structure (A)</p> Signup and view all the answers

Which is a method to remove root filling material?

<p>Both thermal and mechanical methods (C)</p> Signup and view all the answers

What is the primary goal during the preparation of the coronal tooth structure?

<p>To ensure proper access for the post (D)</p> Signup and view all the answers

What property of core materials helps them withstand intraoral forces?

<p>High compressive strength (D)</p> Signup and view all the answers

Which core build-up material is known for excellent esthetics?

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

What is a disadvantage of using composite resins as a core material?

<p>Interference from eugenol during polymerization (B)</p> Signup and view all the answers

What aspect of glass ionomer materials limits their use in extensive tooth structure loss?

<p>Solubility and moisture sensitivity (D)</p> Signup and view all the answers

Why might amalgam require additional retention features like pins?

<p>Due to non-adhesive properties (B)</p> Signup and view all the answers

Which property is NOT a requirement for ideal core materials?

<p>High tensile strength (A)</p> Signup and view all the answers

What is a noted advantage of amalgam cores?

<p>Good physical and mechanical properties (B)</p> Signup and view all the answers

What is an optimal condition for using resin-modified glass ionomer materials?

<p>With adequate retention features (C)</p> Signup and view all the answers

What is the minimum height requirement for a ferrule?

<p>1.5 – 2 mm (C)</p> Signup and view all the answers

What should the ferrule NOT encircle during preparation?

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

Which of the following is a key benefit of the ferrule effect?

<p>Improves stability and resistance to rotation (D)</p> Signup and view all the answers

Which of the following is NOT one of the six important features for post design?

<p>Rotational flexibility (B)</p> Signup and view all the answers

What is the recommended minimum apical gutta-percha length that should remain?

<p>5 mm (B)</p> Signup and view all the answers

Which factor is essential in post selection for a successful core system?

<p>Compatible bonding capability (D)</p> Signup and view all the answers

Which property is NOT ideal for a post material?

<p>Minimum retention of the core (C)</p> Signup and view all the answers

What should one calculate before removing gutta-percha from a root canal?

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

Which condition is NOT an indication for the restoration of an endodontically treated tooth?

<p>Healthy tooth structure with no damage (D)</p> Signup and view all the answers

What factor is important for ensuring the retention of core material in non-retentive abutments?

<p>Presence of a ferrule (B)</p> Signup and view all the answers

What is the purpose of creating a small groove in the canal wall of an extensively damaged tooth?

<p>To serve as an antirotational element (B)</p> Signup and view all the answers

Which of the following is NOT a principle of tooth preparation for post and core systems?

<p>Increased size of the root canal (C)</p> Signup and view all the answers

What defines the ferrule effect in the context of crown preparation?

<p>A vertical band of tooth structure at the gingival aspect (A)</p> Signup and view all the answers

Which characteristic is essential for a root of an endodontically treated tooth to be considered biologically sound?

<p>Absence of resorption or fractures (B)</p> Signup and view all the answers

Which type of resistance is primarily concerned with preventing rotational movement in a post and core restoration?

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

What is a significant requirement for root canal filling to enhance the restoration of an endodontically treated tooth?

<p>Perfect apical and lateral seal (A)</p> Signup and view all the answers

What is a primary benefit of using Glass Ionomer Cement (GIC) after an MOD restoration?

<p>It can effectively block out after restoration removal. (C)</p> Signup and view all the answers

Which statement accurately describes an endocrown?

<p>It retains enamel to enhance adhesion. (C)</p> Signup and view all the answers

What distinguishes Cast Core restorations from other types?

<p>They prevent dislodgement of the crown from the post. (B)</p> Signup and view all the answers

What is a key principle of the Morphology Driven Preparation Technique?

<p>Achieve depth cuts for tissue reduction. (A)</p> Signup and view all the answers

Why might the Cast Core procedure be considered disadvantageous?

<p>It can involve the loss of healthy tooth structure. (D)</p> Signup and view all the answers

What is the purpose of the silicone index in Morphology Driven Preparation Technique?

<p>To control the thickness during tissue reduction. (D)</p> Signup and view all the answers

What is a characteristic of the preparation sequence in Morphology Driven Preparation Technique?

<p>It involves anatomical reduction of the occlusal surface. (A)</p> Signup and view all the answers

In which situation might an endocrown be considered as an alternative solution?

<p>For molars needing post-retained restorations. (D)</p> Signup and view all the answers

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Flashcards

Indications for Post and Core

A post and core restoration is indicated when a tooth cannot be restored with other methods due to extensive tooth structure loss, requiring reinforcement.

Preservation of Tooth Structure

Preserving as much of the original tooth structure as possible during preparation to maintain strength and longevity.

Retention of Post and Core

The design of the preparation should prevent the post and core from being dislodged by forces applied during function.

Resistance Form for Post and Core

The preparation should resist forces that could cause the post and core to fracture or move out of position.

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Ferrule Effect

A vertical wall of tooth structure surrounding the preparation at the gum line, providing extra strength and support.

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Rotational Resistance

This type of resistance prevents the post from rotating within the root canal, crucial for a stable restoration.

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Anti-rotational Groove

A groove placed at the cervical bulkiest area of the canal counteracts rotation, vital for retaining the post.

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Placement of Post and Core

The post and core restoration is placed according to the preparation's design, ensuring proper fit and function.

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Ferrule Height

The amount of tooth structure remaining above the core, extending onto sound tooth structure. A minimum of 1.5-2mm is ideal.

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Ferrule Encirclement

The ferrule encircles the entire prepared tooth, ensuring complete support and preventing rotation.

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Ferrule Termination

The ferrule should end on sound tooth structure, not on the core, to avoid compromising its strength and prevent failure.

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Ferrule and Attachment Apparatus

The ferrule should not extend into the attachment apparatus of the tooth, preserving the delicate periodontal fibers.

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Ferrule Deficiency

A situation where a ferrule is not achievable due to insufficient tooth structure, requiring surgical crown lengthening or forced eruption to create more tooth.

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Post Length

The ideal length of a post, calculated by considering the height of the natural crown and the length of the root, typically 2/3 the root length.

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Ideal Post Material Properties

A strong, durable, and biocompatible material that is resistant to corrosion and ideally has a good bond to the core and crown.

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Root Filling Material Removal

Removing the existing filling material from the root canal to prepare for a post and core.

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Canal Enlargement

Enlarging the root canal to accommodate the post and core, ensuring a secure fit.

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Post System Selection

Choosing the right post system based on the tooth's anatomy and the desired restoration, ensuring a strong and stable foundation.

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Post Cementation

Securing the post into the root canal using a strong adhesive material like resin cement.

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Custom Made Post Construction

Customizing a post specifically to the tooth's shape after taking an impression, for a perfect fit.

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Coronal Tooth Structure Preparation

Preparing the remaining tooth structure around the root canal for the restoration, ensuring proper shape and support.

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Positive Stop Preparation

A preparation technique where the remaining coronal tooth structure is shaped perpendicular to the post, creating a ledge to prevent overseating and the core from dislodging.

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Compressive Strength (Core Material)

The ability of a material to withstand compressive forces, essential for resisting biting forces on a core.

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Tensile Strength (Core Material)

A material's resistance to stretching or pulling forces, crucial for a core's ability to withstand the pulling forces during chewing.

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Bonding Ability (Core Material)

The ability of a core material to bond to tooth structure and posts, creating a unified and strong restoration.

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Similar Thermal Expansion (Core Material)

The property of a material to expand or contract at the same rate as tooth structure when exposed to temperature changes, preventing damage to the restoration due to expansion or contraction mismatch.

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Dimensional Stability (Core Material)

The ability of a core material to maintain its shape and size over time, resisting changes due to moisture or temperature variations.

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Esthetics (Core Material)

The ability of a core material to blend with the natural tooth color, ensuring a natural-looking restoration.

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Polymerization Shrinkage (Composite)

A core material that shrinks or expands in volume during polymerization (hardening), making it challenging to achieve an accurate fit.

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What is an Endocrown?

A single-piece ceramic restoration that covers the entire tooth, preserving more enamel than traditional post-retained crowns. It penetrates the pulp chamber but not the root canals.

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What is Morphology Driven Preparation Technique (MDPT)?

A minimally invasive approach to preparing teeth for restorations. It prioritizes preserving healthy tooth structure, using depth cuts or a silicone index for thickness control.

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What is the preparation sequence for MDPT?

The preparation sequence in MDPT involves first preparing the interproximal box, then reducing the occlusal surface, and finally defining the margins of the axial walls. The specific margin definition varies for maxillary and mandibular teeth.

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When is an indirect adhesive overlay restoration with MDPT useful?

An indirect adhesive overlay restoration using MDPT is recommended for preserving tooth structure in cases where a deep MOD cavity requires complete cuspal coverage to prevent fracture.

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What are the key improvements achieved by MDPT?

MDPT principles aim to minimize tooth tissue loss, control occlusal surface reduction, reduce margin width, improve restoration insertion, and enhance the esthetics of the transition zone between the tooth and the restoration.

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Explain a Cast Core.

Cast cores are an integral extension of posts, relying on the post for retention. They prevent dislodgement of the core and crown, but require removing some tooth structure for path creation and are time-consuming and expensive.

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When is GIC useful?

Glass Ionomer Cement (GIC) is a good option for block outs when minimal tooth structure loss occurs and a post is not needed. For example, after removing an MOD restoration.

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Study Notes

Restoration of Endodontically Treated Teeth

  • Indications for Post Placement:
    • Retention of core material in non-retentive abutments
    • Severely damaged teeth, losing over 50% of tooth structure
    • Extensive proximal caries with unsupported facial walls, where other restoration methods fail.
    • Bilateral proximal decay with pulp exposure
    • Fractured teeth with exposed pulps
    • Extensive coronal destruction of endodontically treated teeth
    • Retainers for short span bridges, when abutments are endodontically treated
    • Biologically sound roots with no resorption or fractures
    • Sufficient length, thickness, and strength of the root
    • Properly filled root canals with ideal apical and lateral seals
    • Healthy periodontal and alveolar support structures without periapical pathosis

Principles of Tooth Preparation for Post and Core Systems

  • Goal: Preservation of tooth structure, retention, and resistance
  • Rotational Resistance: Maintaining sufficient coronal structure to prevent post rotation using the vertical coronal wall. When coronal dentin is lost, a groove at the cervical bulkiest lingual aspect can prevent rotation.
  • Ferrule Effect:
    • A ferrule is a vertical band of tooth structure at the gingival aspect of a crown preparation.
    • It should be at least 1.5-2 mm high, have parallel axial walls, completely encircle the tooth, and not invade the attachment apparatus.
    • Obtaining a ferrule is crucial for long-term success; load distribution; and improves stability and rotation resistance.
    • Surgical crown lengthening or forced eruption may be necessary if a ferrule cannot be achieved.

Important Features for a Successful Design

  • Adequate apical seal: Crucial for successful restoration
  • Minimal canal enlargement: Maintaining tooth structure
  • Adequate post length: Important for resistance and retention
  • Positive horizontal stop: Minimizes wedging
  • Vertical walls: Prevents rotation
  • Margin extension: Extending restoration onto sound tooth structure

Methodology

  • Post Selection: Proper selection of the post considering root length, tooth anatomy, post width, canal configuration, coronal tooth structure, torquing force & stress, development of hydrostatic pressure
  • Removal of Endodontic Filling: Gutta-percha removal with appropriate techniques (thermal, mechanical) and consideration of apical fill
  • Canal Enlargement: Choosing the correct post system before enlarging the canal. Prefabricated posts are available in kits that include rotary instruments that match the posts for space preparation.
  • Post Cementation: Using dual cure self-adhesive resin cements as better alternatives to conventional resin-based luting cements.
  • Core Fabrication: Creating a core and its building materials.
  • Temporization: Temporary protection and stabilization
  • Try-in and cementation: Final fit and securing of the restoration

Ideal Physical Properties of Post Materials

  • Maximum protection of the root
  • Adequate retention within the root
  • Biocompatible and noncorrosive
  • Maximum retention of the core and crown
  • Maximum protection of the crown margin cement seal
  • Pleasing esthetics
  • Radiopaque

Core Build Up

  • Material Requirements: This step involves selecting the suitable core material for the specific case, considering high compressive strength, biocompatibility, bonding to tooth structure and post, similar thermal expansion to dentin, dimensional stability, and compatibility with esthetics.
  • Material Categories: Different types of core materials (custom made, metal ceramics, composite, amalgam, glass ionomer, cast core) are discussed.
  • Specific Core Materials:
    • Composite resins, advantages & disadvantages
    • Amalgam core, advantages & disadvantages
    • Glass ionomer cements, advantages & disadvantages
    • Cast core

Morphology Driven Preparation Technique

  • Principles intended to improve esthetics, prevent tooth tissue loss by decreasing dentin exposure, guide tissue reduction of the occlusal surface, prepare margins, ensure smooth insertion, and improve transitions.
  • Chronological sequence for preparation.
  • Variations in margin definitions based on tooth type, sound tissue, position, morphology and cusp.
  • Preparation ultimately guided by the anatomical and structural form of the teeth
  • Maxillary bicuspid to molars, and mandibular molars and premolars preparation procedures. Specific dimensional details are given for each

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Restoration Of Endodontically Treated Tooth PDF

Description

Test your knowledge on endodontic treatments and core materials with this quiz. Explore topics such as extraction indications, heat-assisted removal methods, and properties of core materials. Perfect for dental students and professionals looking to refresh their understanding of root canal procedures.

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