Overdentures Overview and Indications
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What is the primary function of an overdenture?

  • To improve overall jaw alignment and function
  • To completely replace all missing teeth with fixed bridges
  • To support remaining natural teeth and implants while covering them (correct)
  • To serve as a permanent solution for dental restoration

    • Which of the following is NOT an advantage of overdenture prosthesis?

  • Complete elimination of bone resorption (correct)
  • Preservation of the residual ridge
  • Increased support from remaining teeth
  • Improved patient esthetics

    • Under which condition is an overdenture indicated?

  • Presence of multiple healthy teeth suitable for a bridge
  • Few remaining teeth that cannot support a partial denture (correct)
  • Patient exhibiting excellent oral hygiene
  • Patient with severe skeletal malocclusion

    • Which of the following is a contraindication for an overdenture?

    <p>Cost and time considerations</p> Signup and view all the answers

    How does an overdenture help in bone preservation?

    <p>By decreasing the rate of bone resorption</p> Signup and view all the answers

    What is a common goal of overdentures?

    <p>To retain proprioception from the natural teeth</p> Signup and view all the answers

    In which scenario would an overdenture NOT be the best treatment option?

    <p>Patient has a healthy set of natural teeth</p> Signup and view all the answers

    What aspect of patient handling is improved with an overdenture?

    <p>Increased manipulative skills with the prosthesis</p> Signup and view all the answers

    What is the primary characteristic of a non-coping abutment?

    <p>The tooth is reduced to a height of 2 to 3 mm.</p> Signup and view all the answers

    What distinguishes short cast copings from long cast copings?

    <p>Short copings have a post fitted to an endodontically treated canal.</p> Signup and view all the answers

    What is the primary objective of using attachments in abutments?

    <p>To increase the retention of the denture base.</p> Signup and view all the answers

    What is a common disadvantage of using submerged vital roots as abutments?

    <p>It can lead to pulp pathosis.</p> Signup and view all the answers

    Which component is NOT part of the attachment system in abutments?

    <p>Coping component</p> Signup and view all the answers

    How are long cast copings primarily characterized?

    <p>They are 5 to 8 mm long and conservatively prepared.</p> Signup and view all the answers

    What is a common retention method for securing attachments to the abutment?

    <p>Securing with cast coping.</p> Signup and view all the answers

    What is a potential challenge associated with submerged vital roots as abutments?

    <p>The roots may become exposed to caries.</p> Signup and view all the answers

    What is a disadvantage of using a spherical retentive element attached to a threaded post for overdentures?

    <p>Risk of carious destruction and root fracture</p> Signup and view all the answers

    In the one-stage technique without root copings, when should the full-arch impression be made?

    <p>As soon as the abutments are prepared</p> Signup and view all the answers

    Which materials can be used for the impression in one-stage technique with existing retentive elements?

    <p>Zinc oxide-eugenol paste or elastomer</p> Signup and view all the answers

    What should not be touched by the custom tray in the full arch impression process?

    <p>The root coping and transfer matrices</p> Signup and view all the answers

    What is the primary difference in constructing record bases for tooth-supported overdentures compared to conventional dentures?

    <p>Incorporation of a metal bearing</p> Signup and view all the answers

    When utilizing a full-arch impression with root copings that do not have retentive elements, when is the impression made?

    <p>Immediately after final cementation of the copings</p> Signup and view all the answers

    What is the purpose of transfer matrices in the impression process?

    <p>To incorporate retentive elements analogs into the working cast</p> Signup and view all the answers

    Which of the following statements is true regarding the impression technique for overdentures?

    <p>Impressions may be made in the same manner as in edentulous arches</p> Signup and view all the answers

    What is the primary purpose of simple tooth modification and reduction in abutment preparation?

    <p>To eliminate undercuts and reduce vertical height</p> Signup and view all the answers

    Which condition is NOT an indication for tooth reduction and cast coping?

    <p>Severe periodontal disease</p> Signup and view all the answers

    In which situation is endodontic therapy and amalgam plug particularly indicated?

    <p>When there is minimal loss of vertical dimension</p> Signup and view all the answers

    What is the expected retention mechanism when using endodontic therapy and cast coping?

    <p>Short posts placed in the root canal</p> Signup and view all the answers

    Which of the following statements regarding overdentures retained by attachments is true?

    <p>Two attachments are sufficient to retain the denture.</p> Signup and view all the answers

    What type of shape is typically used in the endodontic therapy and cast coping technique?

    <p>Shallow dome shape</p> Signup and view all the answers

    For a patient with severe abrasion of teeth, which technique is recommended for abutment preparation?

    <p>Simple tooth modification and reduction</p> Signup and view all the answers

    What is a common misconception about the technique of endodontic therapy and cast coping?

    <p>It requires endodontic treatment on all abutments.</p> Signup and view all the answers

    What is a key criteria for designing the denture base?

    <p>It should not interfere with the normal function of the tongue.</p> Signup and view all the answers

    What is one advantage of a denture base that does not cover the gingiva?

    <p>Facilitates cleaning of interproximal surfaces with the prosthesis in place.</p> Signup and view all the answers

    What happens to temperatures in the gingival sulcus when using closed bases?

    <p>They are significantly higher than with open designs.</p> Signup and view all the answers

    What is a disadvantage of a denture base design that covers the gingiva?

    <p>It can lead to undesirable vacuum retention.</p> Signup and view all the answers

    Which statement is true about the basic rules of overdenture base design?

    <p>Use metal to border the proximal spaces.</p> Signup and view all the answers

    How does the design of the denture base affect plaque retention?

    <p>Open designs increase the chances of plaque retention.</p> Signup and view all the answers

    What is the most significant gingival reaction associated with denture bases?

    <p>Most severe reactions occur where the denture base covers the gingival margin.</p> Signup and view all the answers

    What should be avoided in the design of the denture base with respect to oral hygiene?

    <p>Promoting unnecessary plaque accumulation.</p> Signup and view all the answers

    Study Notes

    Overdentures Overview

    • An overdenture is a removable dental prosthesis that covers one or more remaining natural teeth, their roots, or dental implants.
    • Also known as overlay denture, overlay prosthesis, or superimposed prosthesis.
    • Key goals include maintaining teeth as part of the residual ridge, decreasing bone resorption, retaining proprioception, and enhancing patient manipulation skills.

    Indications for Overdentures

    • Suitable when few remaining teeth are present and are unsuitable for fixed/removable partial dentures.
    • Effective in cases with unhealthy periodontal conditions of remaining teeth.
    • Beneficial for patients with Class II or Class III Angle's classification for improved aesthetics and masticatory function.
    • Useful for patients with large maxillary or mandibular bone defects.
    • Serves as an alternative to single dentures opposing a few natural teeth.
    • Ideal for patients with congenital defects (like cleft palate, microdontia).

    Contraindications for Overdentures

    • Poor oral hygiene may affect success.
    • Inadequate inter-arch space cannot accommodate the denture.
    • Mentally or physically handicapped patients may struggle with overdentures.
    • Cost and time considerations can be a barrier.
    • When other treatments offer better outcomes.
    • Lack of patient acceptance can lead to poor compliance.

    Advantages of Overdenture Prosthesis

    • Preserves the remaining residual ridge by decreasing bone resorption.
    • Retains abutment teeth as part of the residual ridge for additional support.

    Types of Abutments

    • Non-coping Abutment: Tooth is reduced to a height of 2-3 mm, endodontically treated, and filled with amalgam or composite.
    • Abutments with Coping Preparation: Includes short (2-3 mm) and long (5-8 mm) cast copings, potentially requiring endodontic treatment.
    • Abutments with Attachment: Utilizes small precision devices to improve retention, consisting of male and female components.
    • Submerged Vital Roots: A method involving transected roots reduced to 2 mm below the crestal bone covered by a flap, although it carries risks of infection and dehiscence.

    Abutment Preparation Techniques

    • Modification and Reduction: Reshape teeth to remove undercuts and reduce vertical height.
    • Cast Coping Preparation: Reduces sensitivity, ensuring adequate bony support without endodontic treatment.
    • Endodontic Therapy Options: Includes amalgam plugs and cast coping, offering retention through post-and-coping systems.
    • Use of Retentive Elements: Incorporating attachments for overdentures can simulate fixed bridges and provide stability.

    Impression Techniques

    • One-Stage Technique with Supporting Element: Full-arch impressions taken after abutment preparation.
    • One-Stage Technique with Existing Retentive Element: Involves full-arch impressions using transfer matrices for incorporated retentive elements.

    Record Base Construction

    • Design differences for tooth-supported overdentures versus conventional ones involve metal bearing incorporation and ensuring abutment regions remain uncovered.

    Denture Base Design Criteria

    • Should minimize plaque accumulation, avoid mechanical trauma to gingiva, and enable effective oral hygiene.
    • The design must accommodate normal tongue, lip, and cheek functions and maintain aesthetic appearance and speech.

    Base Design Considerations

    • Uncovered bases lead to fewer complications, promoting better hygiene.
    • Direct mechanical trauma is prevented, reducing plaque retention and allowing better access to clean abutment surfaces.
    • Overdenture designs should minimize suction effects, especially in maxillary applications.

    Key Disadvantages of Covered Bases

    • Increase risk of plaque accumulation, mechanical trauma, and can lead to hyperplastic proliferative conditions due to poor hygiene.

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    New Overdenture 5th Class 2021 PDF

    Description

    This quiz covers the key aspects of overdentures, including their definition, indications, and contraindications. Learn about their benefits in dental prosthetics, particularly for patients with few remaining teeth and specific dental conditions. Test your knowledge on maintaining oral health and improving aesthetics with overdentures.

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