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 ____ ___ ____.
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.
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?
What are reasons that would cause you to use wrought wire clasps?
What are reasons that would cause you to use wrought wire clasps?
Wrought wire clasps need ________ retention.
Wrought wire clasps need ________ retention.
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.
In a Kennedy Class 1, what are the mod spaces filled with?
In a Kennedy Class 1, what are the mod spaces filled with?
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?
Why is a tissue stop (tissue rest) necessary?
Why is a tissue stop (tissue rest) necessary?
You always need a tissue stop for both maxillary and mandibular RPDs.
You always need a tissue stop for both maxillary and mandibular RPDs.
Where would you place proximal plates?
Where would you place proximal plates?
When do you need bracing arms?
When do you need bracing arms?
Why do you not need a tissue stop on maxillary RPDs?
Why do you not need a tissue stop on maxillary RPDs?
Maxillary major connectors for distal extensions end in the _____ _______ area.
Maxillary major connectors for distal extensions end in the _____ _______ area.
Acrylic retention lattice does not cover _______ ______ or ____________.
Acrylic retention lattice does not cover _______ ______ or ____________.
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.
