Kennedy Class I Review

Questions and Answers

How many retentive clasps are required for Kennedy Class 1?

For a Kennedy Class 1, a fulcrum line always exists.

True

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 _ ____.

mesial, I bar clasp Signup and view all the answers

For a Kennedy Class 1, all direct retention must be located on the same side of _____ as the distal extension.

the fulcrum line Signup and view all the answers

If an I-bar doesn't work for a Kennedy Class 1, what do you replace it with?

WW-clasp, wrought wire Signup and view all the answers

What are reasons that would cause you to use wrought wire clasps?

to shallow buccal vestibule, buccal tilt of tooth, tissue undercut. Signup and view all the answers

Wrought wire clasps need ________ retention.

.020" Signup and view all the answers

In a Kennedy Class 1, the I-bar must have ___-buccal or _-buccal retention but never a ____ retention.

mid, mesial, distal Signup and view all the answers

In a Kennedy Class 1, what are the mod spaces filled with?

rest, proximal plates, bases Signup and view all the answers

What are the requirements for a lingual plate for a Kennedy Class 1?

rest at each end of plate, covers cingulum of anterior teeth, contact occlusal to HOC on posterior teeth Signup and view all the answers

Why is a tissue stop (tissue rest) necessary?

The stop provides support of the distal extension area before the acrylic is processed onto the framework. Signup and view all the answers

You always need a tissue stop for both maxillary and mandibular RPDs.

False Signup and view all the answers

Where would you place proximal plates?

Adjacent to all edentulous areas that will be filled in. Signup and view all the answers

When do you need bracing arms?

If there is not 180 degrees of encirclement. Signup and view all the answers

Why do you not need a tissue stop on maxillary RPDs?

The major connector is in contact with the soft tissue and acts as one big tissue stop. Signup and view all the answers

Maxillary major connectors for distal extensions end in the _ ___ area.

hamular notch Signup and view all the answers

Acrylic retention lattice does not cover _ or ________.

retromolar pads, tuberosities Signup and view all the answers

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.