Support for Distal Extension Denture Base
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Questions and Answers

What is the main function of support in a distal extension denture base?

  • To enhance speech clarity
  • To maintain proper oral hygiene
  • To provide aesthetic value
  • To resist vertical components of masticatory force (correct)

Which type of tooth support is obtained when abutment teeth are available at both ends of the denture base?

  • Mucosal support
  • Tooth support (correct)
  • Indirect support
  • Tooth-mucosa support

What factors influence the amount of displacement in mucosal support?

  • The type of impression taken only
  • Thickness of the mucosa only
  • Fit of the dentures only
  • Nature of the mucosa and area covered by the denture (correct)

In the context of partial dentures, what does indirect retention refer to?

<p>Preventing the denture from lifting away from the residual ridge (A)</p> Signup and view all the answers

What type of support is provided in a bilateral free-end saddle?

<p>Tooth-mucosa support (A)</p> Signup and view all the answers

What is required for accurate recording of the anatomic form in tooth-borne RPD?

<p>An anatomical impression (C)</p> Signup and view all the answers

What must be prioritized to enhance support in a distal extension removable partial denture?

<p>Best support from resilient tissues (A)</p> Signup and view all the answers

What components are necessary for support in class III partial dentures?

<p>Rests, connectors, and retainers (D)</p> Signup and view all the answers

What is primarily accomplished by the impression technique in prosthodontics?

<p>Support of distal extension bases (C)</p> Signup and view all the answers

Which factor is NOT considered important for the support of a distal extension denture base?

<p>Color of the denture material (C)</p> Signup and view all the answers

What can lead to unstable prostheses in tooth-tissue support?

<p>Resilient and displaceable mucosa (A)</p> Signup and view all the answers

In the context of distal extension dentures, what is a solution to prevent excess stress on abutment teeth?

<p>Record tissue in functional form (A)</p> Signup and view all the answers

Which area is considered the primary stress-bearing region of the lower ridge?

<p>Buccal shelf area (B)</p> Signup and view all the answers

What is the consequence of the tissueward movement of distal extension bases under mastication stress?

<p>Damage to abutment teeth (A)</p> Signup and view all the answers

Which factor does NOT influence the support of a distal extension denture base?

<p>Type of denture polishing technique (A)</p> Signup and view all the answers

In the maxillary ridge, which area serves as the primary stress-bearing region?

<p>Hard palate (B)</p> Signup and view all the answers

What type of feedback do the proprioceptive elements provide during chewing?

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

How does the size of the occlusal table affect the stresses on removable partial dentures?

<p>Smaller occlusal tables reduce forces and stress (D)</p> Signup and view all the answers

What is the first step when adjusting the seated framework to opposing occlusion?

<p>Remove the maxillary framework from the mouth (D)</p> Signup and view all the answers

What does the anatomic form impression method primarily record?

<p>Only the soft and hard tissue at rest (A)</p> Signup and view all the answers

What happens to the denture base when a masticatory load is applied?

<p>It limits load transmission to the underlying structures (A)</p> Signup and view all the answers

What is crucial to maintain while using metal frameworks in dental occlusion?

<p>Designed contact relationship must be maintained (A)</p> Signup and view all the answers

What should be used to evaluate the framework for complete seating?

<p>Disclosing media such as stencil correction fluid (A)</p> Signup and view all the answers

What is a potential negative consequence of using a one-stage impression for removable partial dentures?

<p>Increased load on the abutment teeth (D)</p> Signup and view all the answers

Which of the following statements is true about the effects of the removable partial denture's framework?

<p>It increases torque transmitted to the abutment teeth (A)</p> Signup and view all the answers

What might indicate that the framework is not seating properly?

<p>Presence of incomplete seating visible when framework binds (B)</p> Signup and view all the answers

What must be checked after the framework is completely seated?

<p>The occlusion must be checked for natural tooth contacts (D)</p> Signup and view all the answers

What is the primary objective of functional impression techniques?

<p>To provide maximum support for the denture bases (C)</p> Signup and view all the answers

What effect can proprioceptive feedback have on the occlusal load applied to removable partial dentures?

<p>It influences the direction and magnitude of the load (D)</p> Signup and view all the answers

What should be done if improvement is not seen with each framework modification?

<p>Concern should be raised about frame accuracy (B)</p> Signup and view all the answers

What is the purpose of polishing adjusted regions with rotary rubber points?

<p>Achieve a smoother finish for better fit (D)</p> Signup and view all the answers

What should be avoided during the initial seating of the framework?

<p>Forcing the framework into place (C)</p> Signup and view all the answers

What significantly influences the amount of available support and stability for the DERPD?

<p>The length and contour of the residual ridge (C)</p> Signup and view all the answers

What occurs if a distal extension base is underextended?

<p>Less support from the residual ridge (C)</p> Signup and view all the answers

How is the functional form of the residual ridge defined?

<p>The contour when it supports a functional load (B)</p> Signup and view all the answers

What is a primary goal when recording the residual ridge in its functional form?

<p>To utilize primary stress-bearing areas (D)</p> Signup and view all the answers

What does McLean and others' functional impression aim to achieve?

<p>To record ridge relations under simulated function (C)</p> Signup and view all the answers

Which of the following is NOT a requirement for a functionally based denture?

<p>Flexible denture framework (D)</p> Signup and view all the answers

Which area should be recorded in the functional state for a distal extension removable partial denture?

<p>The buccal shelf region (C)</p> Signup and view all the answers

What is an example of a requirement for the distributed stress denture?

<p>Rigid, non-flexible framework (C)</p> Signup and view all the answers

What is the primary application of the altered cast technique?

<p>Mandibular distal extension partially edentulous arches (A)</p> Signup and view all the answers

What is one of the key benefits of the altered cast technique?

<p>Decreases stress between abutments and ridge (A)</p> Signup and view all the answers

What type of impression is initially taken in the altered cast technique?

<p>Anatomical impression (B)</p> Signup and view all the answers

Why is the altered cast technique seldom used in the maxillary arch?

<p>Different masticatory mucosa characteristics (C)</p> Signup and view all the answers

What is a potential negative outcome of using the altered cast technique?

<p>Poor adaptation to the fitting surface (A)</p> Signup and view all the answers

What should be checked after making the anatomical cast in the altered cast technique?

<p>Metal framework for class one and two (C)</p> Signup and view all the answers

Which part of the mucosa is likely to be less deformed during the altered cast impression process?

<p>Stiff mucosa over the ridge (C)</p> Signup and view all the answers

What is the purpose of modifying the master cast in the altered cast technique?

<p>To establish a more accurate relationship between abutments and ridge (D)</p> Signup and view all the answers

Flashcards

Distal extension denture base support

Resistance to vertical masticatory forces directed towards the basal seat.

Partial denture support requirements

Partial dentures need support from oral structures and retention against dislodgement.

Tooth support (partial dentures)

Support from abutment teeth at the ends of a denture base, often achieved with occlusal rests.

Mucosal support (partial dentures)

Support from the tissue covering the residual alveolar bone, allowing for some movement.

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Tooth-mucosa support (partial dentures)

Support from a combination of teeth and oral mucosa, particularly in free-end saddles.

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Distal extension removable partial denture support

Support comes from both teeth and underlying ridge tissues, needing a coordinated approach.

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Resilient tissue support in dentures

Support acquired from the soft tissues that cover the edentulous ridges.

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Indirect retention of dentures

Mechanisms to prevent the denture from lifting away from the residual ridge.

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Direct retainer design

A retainer design that directly transmits occlusal loads to the abutment teeth to prevent movement or damage.

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Indirect retainer design

A retainer that prevents unsupported end movement away from tissues, when using distal extension denture bases.

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Mucosa resilience

Mucosal tissue flexibility and ability to change shape in response to pressure.

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Residual ridge quality

Quality of the jawbone remaining after tooth loss, affecting denture base support.

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Impression accuracy

Importance of precise impressions to ensure an accurate fit of a distal extension denture.

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Primary stress bearing area (lower jaw)

Buccal shelf (external oblique line to alveolar ridge crest) in lower jaw.

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Primary stress bearing area (maxillary)

Hard palate.

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Residual Ridge Support

The support provided by the remaining bone and soft tissue after tooth loss.

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Anatomic Form

The shape of the residual ridge when NOT supporting a load, like when the denture is out of the mouth.

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Functional Form

The shape of the residual ridge when it IS supporting a load, like when chewing with a denture.

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Functional Impression

An impression taken when the residual ridge is supporting a simulated load.

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Distal Extension Denture Base

The part of a partial denture that extends beyond the last remaining tooth in the back of the mouth.

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Primary Stress-Bearing Areas

The areas on the residual ridge that should receive the most pressure from a denture.

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Secondary Impression

An impression taken to record the relationship between the functional form and the rest of the arch.

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Physiologically Based Denture

A denture designed to distribute forces evenly and promote healthy tissue function.

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Anatomic Form Impression

A one-stage impression technique using elastic material that only captures the resting form of hard and soft tissues, not functional relationships.

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Occlusal Rest

A part of the removable partial denture that fits into a prepared area on the abutment tooth, providing stability and support.

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Denture Base

The part of the removable partial denture that rests on the supporting tissues of the mouth.

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Masticatory Load

The force applied to the removable partial denture during chewing.

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Torque

A twisting force that can stress the abutment teeth and supporting tissues.

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Distal Extension Base

The part of the denture base that extends beyond the last abutment tooth, resting on the soft tissues of the edentulous area.

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Functional Impression Technique

A method of taking an impression that captures the movement of the tissues during chewing, providing more accurate support for the denture.

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Objective of Functional Impression

To maximize support for the denture base by capturing the functional relationship between the denture and the supporting tissues.

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Framework Seating

The process of ensuring a partial denture framework fits perfectly and makes full contact with remaining teeth and supporting tissues. This involves careful adjustment and verification.

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Disclosing Media

Special substances like fluids, pastes, waxes, or spray used to highlight areas where the framework is not completely seated.

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Framework Adjustment

The process of carefully modifying the framework to achieve proper seating and create a perfect fit.

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Occlusion Verification

Checking that the framework allows for natural tooth contacts to occur in the same way as when the framework is not in place.

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Incomplete Seating

When the framework doesn't sit fully and makes contact with only some of the teeth or tissues.

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Over-Adjustment

Excessive modification of the framework can lead to a poorly fitting and unstable framework.

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Stabilization and Retention

The framework provides stability by holding the remaining teeth in their correct position and retention by preventing the denture from coming out of the mouth.

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Component Parts

The individual parts of a framework like rests, proximal plates, and stabilizing components that work together to create a functional unit.

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Altered Cast Technique

A method of impression making primarily used for mandibular distal extension dentures (Kennedy Class I and II). This technique involves modifying the master cast based on a functional impression, aiming for even pressure distribution and improved denture stability.

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Purpose of Altered Cast Technique

The goal of this technique is to achieve an accurate relationship between the abutments (supporting teeth) and the ridge, ensuring equal stress distribution and proper peripheral adaptation of the denture.

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Master Cast vs. Functional Impression

A master cast is created based on an anatomical impression. A functional impression is taken later to record the ridge form under load, and this information is used to modify the master cast.

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Mucocompressive Impression

A type of impression technique that applies pressure to the soft tissues of the mouth to record their functional form.

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Benefits of Altered Cast Technique

This technique potentially reduces postoperative visits, preserves the supporting ridges, improves stress distribution, decreases food impaction, and lowers the risk of abutment tooth damage.

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Potential Drawbacks

It's difficult to control the precise amount of pressure applied during the mucocompressive impression. Additionally, determining the source of pain (fitting surface or occlusion) can be challenging.

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Distal Extension Denture

A type of partial denture that replaces teeth at the back of the mouth and extends beyond the last natural tooth.

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Kennedy Classifications

A system of classification for partially edentulous arches, used for planning different treatment strategies, including the use of the altered cast technique.

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Study Notes

Support for Distal Extension Denture Base

  • Support is resistance to vertical masticatory forces toward the basal seat.
  • All partial dentures need support and retention.
  • Types of Support:
    • Tooth Support: Used when abutment teeth are present at both ends of the denture base (i.e., bounded saddle). Commonly achieved by occlusal rests.
    • Mucosal Support: The mucoperiosteum covering residual alveolar bone. Allows varying degrees of displacement, depending on pressure applied, nature of the mucosa, the area covered by the denture, and the fit of the denture base.
    • Tooth-Mucosa Support: Combination of tooth and mucosal support, especially relevant in bilateral free-end saddles. In class III partial dentures, this requires rests, connectors (stabilizing), and retainers for support. Anatomical impressions are important in recording the form of teeth and residual ridge.
  • Distal Extension Partial Dentures (DED): These dentures don't have the advantage of full tooth support. Support is more reliant on the residual ridge rather than solely on teeth.
    • Support comes from both the teeth and residual ridge tissues.
    • Indirect retention is important to prevent the denture from lifting away from the ridge, and should be incorporated in its design.
    • The extent of residual ridge coverage is a critical factor as it impacts load distribution and stability.
  • Factors Influencing Support:
    • Quality of the residual ridge
    • Extent of residual ridge coverage by the denture base
    • Type and accuracy of impression registration
    • Accuracy of denture base construction
    • Design of the partial framework
    • Total occlusal load applied

Additional Considerations for Support

  • Distal Extension Base: A broader base distributes load more effectively, and a longer base increases the potential for lever action on abutment teeth.
  • Mucosal Support: The type of mucosa and how it is positioned also influences how successfully a denture supports itself.
  • Impression Accuracy: An accurate impression is crucial for obtaining the correct anatomic and functional form of the ridge, allowing the framework to provide ideal support.
  • Framework Design: The framework must fit the master cast precisely and its design to adequately consider stress distribution.
  • Occlusion: Visual evaluation and use of materials like disclosing wax or articulating paper are used to ensure no premature contacts exist.

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Support for Distal Extension Denture Base PDF

Description

This quiz explores the types of support for distal extension dentures, focusing on tooth, mucosal, and tooth-mucosa support. Understanding these concepts is crucial for the effective design and implementation of partial dentures. Test your knowledge on how each support type interacts with denture bases.

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