Question

Which of the following rest eliminates the need for the placement of clasp arm buccally?

• A. Intracoronal rest
• B. Interproximal rest
• C. Extended occlusal rest
• D. Auxiliary rest

Hint:

Intracoronal attachment → Internal retention → No visible buccal clasp.

Answer 1

The Correct Option is A

Step 1: Understanding Clasp Placement in RPD.
In removable partial denture (RPD) design, buccal clasp arms are commonly used for retentionHowever, they may compromise esthetics, especially in anterior or premolar regions
Step 2: Role of Intracoronal Rest.
An intracoronal rest is placed within the crown of the toothIt provides internal support and retention through precision attachmentsSince retention is obtained internally, there is no need for a visible buccal clasp arm
Step 3: Evaluation of Other Options.
Interproximal rest mainly provides support but does not eliminate the need for a clasp
Extended occlusal rest improves support and stress distribution but still requires a clasp for retention
Auxiliary rest is used for additional support and indirect retention, not to replace buccal clasp arms
Step 4: Conclusion.
Since intracoronal rests provide internal retention and eliminate the need for a buccal clasp arm, the correct answer is Intracoronal rest