Removable Partial Dentures Quiz
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Questions and Answers

What is the primary method of retention for a removable partial denture?

  • Adhesion of saliva to the denture and tissues.
  • Atmospheric pressure between the denture and tissues.
  • Cohesion of saliva molecules to each other.
  • Mechanical retention using retaining elements on abutment teeth. (correct)

    • Why is broad and accurate denture base support critical for distal extension partial dentures?

  • To facilitate physiologic molding of tissues around the denture.
  • To evenly distribute occlusal loads and maximize support from the residual ridge. (correct)
  • To enhance the aesthetic appearance of the denture.
  • To increase the adhesion of saliva to the denture base.

    • Besides mechanical retention, which factor contributes to the retention of denture bases?

  • Adhesion of the denture to the abutment teeth.
  • Elimination of undesirable taste sensations.
  • Adhesion of saliva to the denture and tissues. (correct)
  • Stimulation of underlying bone tissues.

    • What is the role of 'physiologic molding' concerning the retention of a denture?

    <p>It involves shaping the polished surfaces of the denture to match tissue contours. (A)</p> Signup and view all the answers

    Which of the following factors is most important for minimizing functional movement of a distal extension partial denture?

    <p>The support provided by the residual ridge. (D)</p> Signup and view all the answers

    What is the primary reason classifications are important in the context of removable partial dentures (RPDs)?

    <p>To facilitate clear communication between the dentist and the lab technician. (B)</p> Signup and view all the answers

    Compared to a fixed partial denture (FPD), what is a major advantage of a removable partial denture (RPD)?

    <p>RPDs can be utilized in more extensive cases, including those with larger spans. (A)</p> Signup and view all the answers

    What is a potential hazard associated with poorly designed removable partial dentures?

    <p>Inflammation and ulceration of soft tissues (C)</p> Signup and view all the answers

    Which of the following is a requirement of an acceptable classification system for partially edentulous arches?

    <p>It should allow immediate assessment if the RPD is bounded or free extension. (B)</p> Signup and view all the answers

    What is a significant cost-related advantage of choosing a removable partial denture over a fixed partial denture?

    <p>RPDs generally cost less than FPDs. (D)</p> Signup and view all the answers

    According to Applegate's rules, what is the primary reason for classifying a partially edentulous arch after mouth preparations?

    <p>To accurately plan for future tooth extractions that may change the classification. (B)</p> Signup and view all the answers

    A patient is missing a third molar, which will not be replaced. How does Applegate's classification system account for this?

    <p>It is not considered in the classification. (A)</p> Signup and view all the answers

    A patient has a missing second molar, and the opposing second molar is also missing. According to Applegate's rules, how should this situation be handled in Kennedy classification?

    <p>It is not considered in the classification. (D)</p> Signup and view all the answers

    A patient presents with a missing left third molar that will be used as an abutment for a future prosthetic appliance. How does Applegate's classification system account for this?

    <p>It is considered in the classification. (C)</p> Signup and view all the answers

    A patient is initially classified as Kennedy Class III. Following the extraction of a left molar, how does this affect the classification according to Applegate's rules?

    <p>It becomes Kennedy Class II. (A)</p> Signup and view all the answers

    During the surveying process for removable partial dentures, what is the primary purpose of parallel blockout?

    <p>To eliminate undercuts in areas contacted by rigid denture framework components. (C)</p> Signup and view all the answers

    Why is it important to provide relief for the gingival crevice and gingival margin during master cast modification for RPD fabrication?

    <p>To prevent tissue impingement and inflammation. (D)</p> Signup and view all the answers

    What is the purpose of providing 20-gauge relief on the residual ridges of a master cast?

    <p>To ensure adequate space for the denture base material. (B)</p> Signup and view all the answers

    In removable partial denture design, what is the significance of identifying and utilizing proximal guide planes?

    <p>They ensure the denture's path of insertion and removal. (A)</p> Signup and view all the answers

    During master cast modification, undercuts are blocked out EXCEPT for areas designated for:

    <p>Retentive clasp tips. (A)</p> Signup and view all the answers

    What is the primary reason for replacing missing teeth?

    <p>To prevent adjacent teeth from shifting into the open space. (B)</p> Signup and view all the answers

    How can the loss of teeth affect mandibular closure?

    <p>It can alter the typical pattern of how the jaw closes. (C)</p> Signup and view all the answers

    Which of the following is NOT a primary objective of removable partial dentures (RPDs)?

    <p>To improve the patient's sense of taste. (B)</p> Signup and view all the answers

    Beyond chewing, what other functional benefit can be expected from a well-fitted removable partial denture?

    <p>Restoration of impaired speech. (D)</p> Signup and view all the answers

    What is a significant esthetic consideration when planning a removable partial denture, especially for anterior tooth replacement?

    <p>Ensuring a socially acceptable and natural appearance. (A)</p> Signup and view all the answers

    What is a potential disadvantage of clasp-retained partial dentures related to the abutment teeth?

    <p>Potential strain due to improper design or support loss. (A)</p> Signup and view all the answers

    What is the most significant patient-related factor that can reduce caries development around clasp-retained RPDs?

    <p>Meticulous cleaning of the prosthesis and abutment teeth. (D)</p> Signup and view all the answers

    Beyond esthetics and function, what is another significant benefit provided by RPDs?

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

    What is the primary purpose of surveying in removable partial denture design?

    <p>To locate and delineate the contours and positions of abutment teeth and associated structures. (B)</p> Signup and view all the answers

    What is an 'undercut' in the context of surveying for removable partial dentures?

    <p>An area where the base of an object is smaller than its top. (A)</p> Signup and view all the answers

    What anatomical feature does the 'survey line' on a tooth represent?

    <p>The most bulbous and convex part of the tooth. (A)</p> Signup and view all the answers

    Which of the following factors can contribute to the presence of undercuts in a partially edentulous mouth?

    <p>The bulbous shape of the crowns of natural teeth. (C)</p> Signup and view all the answers

    In removable partial denture design, which type of undercut is generally considered 'desirable'?

    <p>Undercuts used for denture retention. (A)</p> Signup and view all the answers

    What is meant by the 'path of insertion' for a removable partial denture?

    <p>The direction of movement from initial contact to the final seated position. (D)</p> Signup and view all the answers

    Why is the selection of a favorable path of insertion important in RPD design?

    <p>To allow seating of the denture with the least displacing force. (D)</p> Signup and view all the answers

    Which component of a metallic removable partial denture is designed to be flexible?

    <p>Retentive clasp arm. (D)</p> Signup and view all the answers

    What general direction should the most favorable path of insertion be in relation to the occlusal plane?

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

    The 'path of removal' is best described as:

    <p>The direction of movement of the restoration from its resting position to the last contact with the supporting teeth. (B)</p> Signup and view all the answers

    Why is understanding soft tissue and bony undercuts important in surveying?

    <p>They can interfere with the path of insertion and cause tissue impingement. (C)</p> Signup and view all the answers

    If significant undercuts are present at zero tilt during surveying, what is the likely next step?

    <p>Explore alternative paths of insertion by tilting the cast. (B)</p> Signup and view all the answers

    During denture insertion, most patients tend to seat their dentures under what type of force?

    <p>Biting Force. (A)</p> Signup and view all the answers

    Which of the following is NOT a component of a removable partial denture?

    <p>Abutment Teeth. (D)</p> Signup and view all the answers

    What is another term for the survey line?

    <p>Height of Contour. (B)</p> Signup and view all the answers

    Flashcards

    Oral Cleanliness

    Maintaining hygiene to prevent undesirable food traps in the mouth.

    Retention of Denture Bases

    Support and stabilization of dentures to minimize movement during function.

    Adhesion in Dentures

    The attraction between saliva and the denture surface for retention.

    Cohesion in Saliva

    The attraction between saliva molecules that aids denture retention.

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    Physiologic Molding

    Shaping tissues around polished denture surfaces for a better fit.

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    Tooth Decay

    The process of dental tissues deteriorating due to acid-producing bacteria.

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    Inflammation from Dentures

    Soft tissues react with swelling and pain due to denture irritation.

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    RPD vs FPD

    Removable Partial Denture (RPD) is less restrictive compared to Fixed Partial Denture (FPD).

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    Classification Importance

    Classifications of partially edentulous arches help in dental communication and design.

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    Advantages of RPDs

    RPDs are cheaper, easier to clean, and easier to repair than FPDs.

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    Migration of Teeth

    The movement of teeth into gaps after losing natural teeth.

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    Removable Partial Dentures (RPD) Objectives

    Goals of RPD include restoring dental arch continuity and improving aesthetics.

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    Masticatory Function

    Effective chewing ability affected by tooth loss.

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    Support for Paraoral Muscles

    RPD provides support to lips, cheeks, and surrounding muscles.

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    Restoration of Speech

    Improving clarity of speech affected by tooth loss.

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    Disadvantages of Clasp-retained Partial

    Various issues arise from clasp retention like stress on abutment teeth.

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    Caries Development Under Clasps

    Dental decay may occur beneath clasps if the area is not cleaned properly.

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    Esthetics of RPD

    Aesthetics are important; RPD should appear natural and socially acceptable.

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    Rule 1 of Kennedy Classification

    Classification should follow mouth preparations since extractions may alter the class.

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    Impact of Missing Left Molar

    If the left molar is extracted, class III changes to class II.

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    Rule 2 of Kennedy Classification

    If the third molar is missing and not replaced, it is not considered in the classification.

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    Rule 3 of Kennedy Classification

    If the third molar is present and used as an abutment, it is included in the classification.

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    Rule 4 of Kennedy Classification

    If the second molar is missing and not replaced, and the opposing second molar is also missing, it is not considered in the classification.

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    Master Cast Modifications

    Adjustments made to the master cast for proper denture fit.

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    Guiding-Plane Areas

    Surfaces that must be parallel to the path of denture placement.

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    Parallel Blockout

    Removing undercuts to ensure proper denture framework contact.

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    GINGIVAL Relief

    Space provided around the gingiva to accommodate denture fit.

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    Retentive Tips

    Features on retainer clasps that hold dentures in place.

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    Surveying

    The procedure of locating and delineating contours of abutment teeth before designing a removable partial denture.

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    Denture Base

    The part of a removable partial denture that supports artificial teeth and rests on the edentulous ridge.

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    Artificial Teeth

    Teeth that replace natural teeth in removable partial dentures, providing function and aesthetics.

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    Supporting Rests

    Components of a removable partial denture that distribute forces and provide stability.

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    Connectors

    Parts that join various components of a removable partial denture, including major and minor connectors.

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    Retainers

    Elements of a removable partial denture that help keep it securely in place on natural teeth.

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    Undercut

    An area on a tooth that is smaller at the base than at the top, creating a space for dental appliances.

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    Survey Line

    A line indicating the greatest prominence of tooth contour on a cast, marked by a surveyor.

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    Path of Insertion

    The direction in which a removable partial denture is placed onto the supporting teeth.

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    Path of Removal

    The direction in which a removable partial denture is taken off from its resting position.

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    Desirable Undercuts

    Specific undercuts that are intentional and beneficial for retaining a removable partial denture.

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    Undesirable Undercuts

    Undercuts that hinder the proper fit and retention of a removable partial denture.

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    Types of Undercuts

    Undercuts can include tooth undercuts and soft tissue undercuts affecting denture placement.

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    Inclination of Teeth

    The angle at which teeth are positioned relative to a vertical line can create undercuts.

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    Proliferation of Soft Tissues

    Growth of soft tissues covering the edentulous ridge, which can form undercuts.

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    Study Notes

    Denture Base Considerations

    • Denture bases control prosthesis movement.
    • Main support:
      • Supports artificial teeth and RPD support.
      • Transfers functional forces to supporting oral structures.
      • Provides functional stability (distal extension).
      • Enables masticatory and esthetic functions.
      • Stimulates underlying tissues of the residual ridge.
    • Stability: distal extension.
    • Anterior tooth replacement function:
      • Provides esthetics.
      • Supports and retains artificial teeth for mastication and force transfer to abutment teeth through rests.
      • Prevents vertical and horizontal migration of remaining natural teeth.
      • Eliminates food traps.
      • Stimulates underlying tissues.

    Tooth-Supported Partial Denture Base

    • Forces are transferred directly to abutments through rests.
    • Denture base and supplied teeth prevent horizontal/vertical migration of teeth.
    • Occlusal forces prevent horizontal/vertical migration.

    Distal Extension Partial Denture Base

    • Retention is critical for minimizing functional movement and improving stability.
    • Maximum residual ridge support using broad, accurate bases.
    • Primary retention is achieved mechanically by placing retaining agents on abutment teeth.
    • Secondary retention is provided by intimate relationship between denture bases/major connectors and underlying tissues.
    • Incorporating dental implants:
      • Acrylic-resin bases attached using minor connectors that create space between framework and residual ridge tissues.
        • Designs with plastic mesh may weaken the resin base.
      • Anterior implants account for retentive device bulk and connection.
      • Distal implants consider support for the prosthesis.

    Ideal Denture Base Material

    • Accurate tissue adaptation.
    • Dense, non-irritating surface for finish.
    • Low thermal conductivity (heat transfer).
    • Low specific gravity (lightweight).
    • Sufficient strength, fracture/distortion resistance.
    • Easily kept clean.
    • Esthetic acceptability.
    • Relining potential.
    • Low initial cost.

    Advantages of Metal Bases

    • Accuracy and performance of form.
    • Comparative tissue response.
    • Thermal conductivity.
    • Light weight and bulk.

    Methods of Attaching Artificial Teeth

    • Porcelain/Acrylic-Resin Artificial Teeth: Attached using acrylic-resin.
    • Porcelain/Resin Tube Teeth/Facings: Cemented directly to metal bases.
    • Resin Teeth: Processed directly to metal bases.
    • Metal teeth.
    • Chemical bonding.

    Need for Relining

    • Loss of support in distal extension bases results in loss of occlusal contact.
    • Lingual collar reinforcement with a post.
    • Indication of relining needed when heavy occlusal contact is present between remaining natural teeth.
    • Relining needed to reestablish occlusion contact and ensure functional use.
    • Support ridge is poor. Occlusal function is suboptimum.

    Stress-Breakers (Stress Equalizers)

    • In distal extension, rigid connections between denture base and supporting teeth must account for base movement without causing tooth or tissue damage.
    • Minimizing stress on abutment teeth and residual ridge through:
      • Functional basing.
      • Broad coverage.
      • Harmonious occlusion.
      • Correct choice of direct retainers.
    • Two major types of clasp assemblies used in distal extensions have stress-breaking designs (e.g., wrought wire clasps).

    Terminology

    • Prosthesis: artificial replacement of an absent part of the body.
    • Dentulous Patients: have a complete set of natural teeth.
    • Edentulous Patients: have all their teeth missing.
    • Partially Edentulous Patients: have one or more missing teeth, but not all.

    Indications and Contraindications of Removable Partial Dentures

    • No abutment tooth posterior to the edentulous space.
    • Long edentulous area that is too extensive for a fixed restoration.
    • Periodontally weak teeth that cannot support a fixed partial denture.
    • Need of bilateral bracing/cross-arch stabilization.

    Consequences of Tooth Loss

    • Anatomic and physiologic effects on mastication and oral capacity.
    • Bone loss (more in mandible than maxilla).
    • Posterior bone loss more pronounced than anterior.
    • Broader mandibular arch; constricted maxillary.

    Additional Info from Slides

    • Free end edentulous area (distal extension edentulous area): edentulous area with one abutment tooth.
    • Bounded edentulous area: edentulous area with abutment teeth on both sides.
    • Abutment: teeth or portion of tooth or dental implant that supports and/or retains a prosthesis.
    • Classifications of partially edentulous arches: -Based on support (tooth and tissue supported, tooth supported, tissue supported). -Based on posterior edentulous span (bilateral/unilateral).
    • Rules for applying Kennedy Classification

    Procedures of Surveying

    • Placement of the cast
    • Modifying the cast's position (anteroposteriorly).
    • Tilting the cast laterally, creating similar retentive areas.
    • Eliminating interference areas.
    • Reshaping tooth surfaces.
    • Creating a more esthetic clasp arrangement.
    • Establishing the path of insertion and removal.
    • Recording the cast position.

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    Denture Base Considerations PDF

    Description

    Test your knowledge on removable partial dentures, focusing on factors affecting their retention, classification systems, and advantages over fixed alternatives. This quiz addresses the critical components necessary for effective denture design and function. Prepare to enhance your understanding of RPDs and their importance in dental prosthetics.

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