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.
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Direct retainers for a Kennedy Class III RPD do not require stress breakers.
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Tooth-supported RPDs gain support mostly from abutment teeth, but some from the tissue as well.
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Because Kennedy Class III has no distal extensions, there is no anterior-posterior rotation.
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Because less rigidity is required for Kennedy Class III, a palatal strap is used for edentulous spaces in the posterior.
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Class III does not require border molding for the edentulous area, only a PVS with a custom tray.
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What type of direct retainer offers bilateral bracing?
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What type of direct retainer has better esthetics with an I-bar and cast circumferential bracing clasp arm on lingual?
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What type of direct retainer has increased bracing, support, and retention?
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What type of clasp is common for tooth-supported partial dentures and includes a retentive clasp arm, reciprocal clasp arm, and a rest?
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What type of undercut do cast circumferential clasp/Akers clasps/simple circlet clasps have?
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What clasp assemblies are indicated for tooth-supported RPD?
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Cast circumferential clasp/Akers clasps/simple circlet clasps are for Kennedy Class I, II, III, and IV.
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The _____ rest prevents movement of the clasp toward the cervical.
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What elements should be located at the junction of the gingival and middle thirds of the crowns of abutment teeth?
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The terminal end of the retentive arm is optimally placed in the occlusal third of the crown.
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What clasp assembly is commonly placed in Class II or Class II (unilateral) RPDs?
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A contraindication for an embrasure clasp is insufficient space to pass between occlusal embrasure.
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Class III RPD design?
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Class IV RPD must have rests placed on the teeth adjacent to the edentulous area.
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What classes require indirect retention?
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Tooth-supported Class IV RPD can have a rigid direct retainer.
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How many retainers are commonly used in a Kennedy Class IV?
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To develop a treatment plan, we must understand the patient's desires or chief concerns.
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What are the four objectives of prosthodontic treatment?
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What are the four appropriate selections/sequencing of treatment?
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Inflammatory hyperplasia?
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What are common causes of soft tissue conditions?
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What type of RPDs do fungal infections commonly appear?
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How much interocclusal space must exist for framework and resin?
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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.
