Podcast
Questions and Answers
How many retentive clasps are required for Kennedy Class 1?
How many retentive clasps are required for Kennedy Class 1?
2
For a Kennedy Class 1, a fulcrum line always exists.
For a Kennedy Class 1, a fulcrum line always exists.
True (A)
Is indirect retention required for Kennedy Class 1 and if so, where is it located?
Is indirect retention required for Kennedy Class 1 and if so, where is it located?
Yes, located opposite of the distal extension of the fulcrum line.
For a Kennedy Class 1, all primary abutment teeth have to have rest on the _________ side and ____ ___ ____.
For a Kennedy Class 1, all primary abutment teeth have to have rest on the _________ side and ____ ___ ____.
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For a Kennedy Class 1, all direct retention must be located on the same side of _____ as the distal extension.
For a Kennedy Class 1, all direct retention must be located on the same side of _____ as the distal extension.
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If an I-bar doesn't work for a Kennedy Class 1, what do you replace it with?
If an I-bar doesn't work for a Kennedy Class 1, what do you replace it with?
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What are reasons that would cause you to use wrought wire clasps?
What are reasons that would cause you to use wrought wire clasps?
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Wrought wire clasps need ________ retention.
Wrought wire clasps need ________ retention.
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In a Kennedy Class 1, the I-bar must have _____-buccal or _____-buccal retention but never a ______ retention.
In a Kennedy Class 1, the I-bar must have _____-buccal or _____-buccal retention but never a ______ retention.
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In a Kennedy Class 1, what are the mod spaces filled with?
In a Kennedy Class 1, what are the mod spaces filled with?
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What are the requirements for a lingual plate for a Kennedy Class 1?
What are the requirements for a lingual plate for a Kennedy Class 1?
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Why is a tissue stop (tissue rest) necessary?
Why is a tissue stop (tissue rest) necessary?
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You always need a tissue stop for both maxillary and mandibular RPDs.
You always need a tissue stop for both maxillary and mandibular RPDs.
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Where would you place proximal plates?
Where would you place proximal plates?
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When do you need bracing arms?
When do you need bracing arms?
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Why do you not need a tissue stop on maxillary RPDs?
Why do you not need a tissue stop on maxillary RPDs?
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Maxillary major connectors for distal extensions end in the _____ _______ area.
Maxillary major connectors for distal extensions end in the _____ _______ area.
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Acrylic retention lattice does not cover _______ ______ or ____________.
Acrylic retention lattice does not cover _______ ______ or ____________.
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Study Notes
General Concepts of Kennedy Class I
- Kennedy Class I requires 2 retentive clasps for support.
- A fulcrum line always exists in Kennedy Class I, allowing for proper functional movement.
Indirect Retention
- Indirect retention is essential and is positioned opposite the distal extension of the fulcrum line.
Requirements for Abutment Teeth
- All primary abutment teeth must have rests on the mesial side and use an I-bar clasp for support.
- Direct retention must also be located on the same side as the distal extension, ensuring stability during function.
Alternative Clasps
- If an I-bar proves ineffective, replace it with a Wrought wire clasp (WW-clasp).
- Wrought wire clasps are advantageous in scenarios such as a shallow buccal vestibule, buccal tooth tilt, or tissue undercut.
Specifications of Wrought Wire Clasps
- Wrought wire clasps require .020" of retention for adequate gripping.
Clasps and Retention Types
- For I-bars in Kennedy Class I, retentive components must provide mid-buccal or mesial-buccal retention, never distal retention.
Modifications for Edentulous Spaces
- Modifications in Class I typically involve filling edentulous spaces with rests, proximal plates, or bases.
Lingual Plate Requirements
- A lingual plate for Kennedy Class I must have:
- Rest at each end of the plate
- Coverage of the cingulum on anterior teeth
- Contact occlusal to the height of contour on posterior teeth
Tissue Stops
- A tissue stop (tissue rest) is required to support the distal extension area prior to acrylic processing on the framework.
- Tissue stops are not required for maxillary RPDs, as the major connector fulfills this role, but are necessary for 3 mm ovoid stops in mandibular RPDs.
Proximal Plates Placement
- Proximal plates are strategically placed adjacent to all edentulous areas intended to be restored.
Bracing Arms Necessity
- Bracing arms are required if there is insufficient 180-degree encirclement around the abutment teeth.
Maxillary Major Connectors
- Maxillary major connectors for distal extensions should terminate in the hamular notch area, crucial for stability and support.
Acrylic Retention Limits
- The acrylic retention lattice should not cover retromolar pads or tuberosities, ensuring effective retention without obstructing oral structures.
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Description
Test your knowledge on Kennedy Class I dental prosthesis design with these flashcards. This review covers crucial aspects such as retentive clasps and fulcrum lines. Perfect for dental students and professionals brushing up on RPD design principles.
