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

Step 1: Understanding Kennedy’s Classification.
Missing teeth 14–18 and 24–28 indicate bilateral posterior edentulous areasThis corresponds to Kennedy’s Class I situation, where there are bilateral distal extension bases
Step 2: Clinical Significance of Distal Extension.
In distal extension cases, the prosthesis is supported by both teeth and mucosaTeeth provide firm support, while mucosa is compressibleHence, differential support must be managed carefully to avoid stress on abutment teeth
Step 3: Rationale for Altered Cast Technique.
The altered cast technique is specifically used in Kennedy Class I and II casesIt allows recording of the edentulous ridge under functional loadThis improves adaptation, support, and stress distribution of the removable partial denture
Step 4: Analysis of Options.
(A) Mucocompressive — Not preferred due to excessive tissue displacement
(B) Open mouth — General impression technique, not specific for distal extension
(C) Close mouth — Used in complete denture techniques
(D) Altered cast technique — Ideal for Kennedy Class I distal extension cases
Step 5: Conclusion.
Therefore, the correct special impression technique for this Kennedy Class I case is Altered cast technique