Question

A 45-year-old female is missing teeth 14–18 and 24–28Which special impression technique will be used for this Kennedy’s Class I situation?

• A. Mucocompressive
• B. Open mouth
• C. Close mouth
• D. Altered cast technique

Hint:

Kennedy Class I & II (distal extension) → Always think of Altered Cast Technique for better stress distribution.

Answer 1

The Correct Option is D

To determine the correct impression technique for the given scenario, we first need to understand the specifics of the situation. The patient is missing teeth 14-18 and 24-28, which corresponds to a Kennedy Class I partial edentulism. This classification is distinguished by bilateral free-end edentulous spaces located posteriorly.

In the context of Prosthodontics, especially for a bilateral free-end saddle design, the key challenge lies in achieving accurate impressions that consider the differential support from the remaining teeth and the edentulous ridge. The ridge can be more compressible than the hard tissues supported by teeth, which affects the fit and function of the denture.

The Altered cast technique is preferred in this situation for the following reasons:

1. The technique allows for a functional impression of the free-end edentulous spaces, considering the residual ridge's resilience.
2. It involves an initial framework try-in and additional sectional impression of the edentulous area, enhancing the fit and stability of the final dental prosthesis.
3. This approach improves the distribution of masticatory forces by ensuring the denture has optimal tissue adaptation without excessive pressure on the edentulous ridge.

Now, let's examine why other options are not suitable:

1. Mucocompressive: This technique captures tissues in a compressed state, which may lead to discomfort and instability in free-end situations.
2. Open mouth: Not a standard technique for maximizing tissue adaptation and retention in free-end situations and lacks the specificity needed for functional impressions.
3. Close mouth: This technique facilitates a physiological impression but may not be specialized enough for Kennedy Class I cases that need additional adjustment and support.

In conclusion, the Altered cast technique is the ideal special impression approach for dealing with Kennedy Class I situations to ensure both practical functionality and patient comfort.