Kennedy Class III and IV RPD Design Quiz
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Questions and Answers

What is Kennedy Class III?

A dental classification for tooth-supported removable partial dentures.

What Kennedy classification is a tooth-supported RPD?

Class III

An indirect retainer is needed for a Class III RPD.

False

Because the major connectors for Class III RPD require less rigidity, there are more major connector options for this type.

<p>True</p> Signup and view all the answers

Direct retainers for a Kennedy Class III RPD do not require stress breakers.

<p>True</p> Signup and view all the answers

Tooth-supported RPDs gain support mostly from abutment teeth, but some from the tissue as well.

<p>False</p> Signup and view all the answers

Because Kennedy Class III has no distal extensions, there is no anterior-posterior rotation.

<p>True</p> Signup and view all the answers

Because less rigidity is required for Kennedy Class III, a palatal strap is used for edentulous spaces in the posterior.

<p>True</p> Signup and view all the answers

Class III does not require border molding for the edentulous area, only a PVS with a custom tray.

<p>True</p> Signup and view all the answers

What type of direct retainer offers bilateral bracing?

<p>Cast circlet clasp (Akers)</p> Signup and view all the answers

What type of direct retainer has better esthetics with an I-bar and cast circumferential bracing clasp arm on lingual?

<p>Cast circumferential and cast bar clasp (combo)</p> Signup and view all the answers

What type of direct retainer has increased bracing, support, and retention?

<p>Embrasure clasp</p> Signup and view all the answers

What type of clasp is common for tooth-supported partial dentures and includes a retentive clasp arm, reciprocal clasp arm, and a rest?

<p>Circumferential clasp</p> Signup and view all the answers

What type of undercut do cast circumferential clasp/Akers clasps/simple circlet clasps have?

<p>0.010&quot;</p> Signup and view all the answers

What clasp assemblies are indicated for tooth-supported RPD?

<p>Cast circumferential clasp, Akers clasps, simple circlet clasps</p> Signup and view all the answers

Cast circumferential clasp/Akers clasps/simple circlet clasps are for Kennedy Class I, II, III, and IV.

<p>False</p> Signup and view all the answers

The _____ rest prevents movement of the clasp toward the cervical.

<p>occlusal</p> Signup and view all the answers

What elements should be located at the junction of the gingival and middle thirds of the crowns of abutment teeth?

<p>Reciprocal</p> Signup and view all the answers

The terminal end of the retentive arm is optimally placed in the occlusal third of the crown.

<p>False</p> Signup and view all the answers

What clasp assembly is commonly placed in Class II or Class II (unilateral) RPDs?

<p>Embrasure clasps</p> Signup and view all the answers

A contraindication for an embrasure clasp is insufficient space to pass between occlusal embrasure.

<p>True</p> Signup and view all the answers

Class III RPD design?

Signup and view all the answers

Class IV RPD must have rests placed on the teeth adjacent to the edentulous area.

<p>True</p> Signup and view all the answers

What classes require indirect retention?

<p>Class I, II, IV</p> Signup and view all the answers

Tooth-supported Class IV RPD can have a rigid direct retainer.

<p>True</p> Signup and view all the answers

How many retainers are commonly used in a Kennedy Class IV?

<p>2-4 (2 anterior, 2 posterior)</p> Signup and view all the answers

To develop a treatment plan, we must understand the patient's desires or chief concerns.

<p>True</p> Signup and view all the answers

What are the four objectives of prosthodontic treatment?

<ol> <li>Eliminate disease, 2. Preservation, restoration, and maintenance of oral health, 3. Selective replacement of lost teeth, 4. Restoration of function</li> </ol> Signup and view all the answers

What are the four appropriate selections/sequencing of treatment?

<ol> <li>Control of caries/perio diseases, 2. Restoration of individual teeth, 3. Provision of harmonious occlusal relationships, 4. Replacement of missing teeth</li> </ol> Signup and view all the answers

Inflammatory hyperplasia?

Signup and view all the answers

What are common causes of soft tissue conditions?

<p>Lack of positive rest, fungal infections, poor adaptation, hyperocclusion</p> Signup and view all the answers

What type of RPDs do fungal infections commonly appear?

<p>Acrylic resin</p> Signup and view all the answers

How much interocclusal space must exist for framework and resin?

<p>1-1.5 mm framework, 2 mm acrylic resin</p> Signup and view all the answers

Study Notes

Kennedy Class III RPD Design

  • Kennedy Class III classification is defined by tooth-supported removable partial dentures (RPDs) with tooth-supported areas only.
  • An indirect retainer is not necessary for Class III RPDs.
  • Major connectors for Class III RPDs offer more options due to reduced rigidity requirements.
  • Direct retainers do not require stress breakers in Kennedy Class III RPDs.
  • Complete support for tooth-supported RPDs comes exclusively from abutment teeth; no support is derived from the tissue.
  • The absence of distal extensions in Kennedy Class III prevents anterior-posterior rotation.
  • A palatal strap connector is suitable for posterior edentulous spaces due to less rigidity required.
  • Border molding is unnecessary for Kennedy Class III; a polyvinyl siloxane (PVS) impression can suffice with a custom tray.

Direct Retainers and Clasp Types

  • Bilateral bracing in direct retainers is provided by cast circumferential clasps (Akers).
  • Cast circumferential and cast bar clasps combine better esthetics with increased retention.
  • Embrasure clasps increase bracing, support, and retention in RPD designs.
  • Circumferential clasps are common in tooth-supported partial dentures, featuring a retentive and reciprocal clasp arm with a rest.
  • Cast circumferential clasps, Akers clasps, and simple circlet clasps are suitable for RPDs specifically for tooth support.
  • Cast circumferential clasps are not advised for use with distal extensions, limiting them to classes I, II, III, and IV.

Rests and Clasp Assembly

  • Occlusal rests prevent movement of clasps toward the cervical area of abutment teeth.
  • Reciprocal elements should be positioned at the junction of the gingival and middle thirds of abutment crowns.
  • The terminal end of the retentive arm should ideally be located in the gingival third of the abutment tooth.

Class IV RPD Design

  • Class IV RPD designs must include rests on teeth bordering the edentulous area.
  • Classes I, II, and IV require indirect retention for proper support.
  • Tooth-supported Class IV RPDs can utilize rigid direct retainers.
  • Usually, 2 to 4 retainers (typically 2 anterior and 2 posterior) are used in Kennedy Class IV designs.

Treatment Planning and Objectives

  • Understanding the patient's desires or chief concerns is essential for developing a successful treatment plan.
  • Objectives of prosthodontic treatment include:
    • Eliminating disease.
    • Preservation, restoration, and maintenance of oral health.
    • Selected replacement of lost teeth.
    • Restoration of oral function.
  • Steps in the appropriate selection and sequencing of treatment involve:
    • Managing caries and periodontal disease.
    • Restoring individual teeth.
    • Achieving harmonious occlusal relationships.
    • Replacing missing teeth.

Soft Tissue Conditions

  • Inflammatory hyperplasia is a condition frequently associated with removable partial dentures.
  • Common causes of soft tissue conditions include:
    • Insufficient positive rests.
    • Fungal infections.
    • Poor adaptation of prostheses.
    • Hyperocclusion.
  • Fungal infections are commonly associated with acrylic resin RPDs.

Interocclusal Space Requirements

  • A minimum interocclusal space of 1-1.5 mm is necessary for framework components, with an additional 2 mm recommended for acrylic resin.

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Description

Test your knowledge on the design principles of Kennedy Class III and IV Removable Partial Dentures (RPD). This quiz includes true/false questions and definitions to help reinforce your understanding of key concepts in this classification system.

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