**Core Concept:** The concept of clasp design in dental prosthodontics involves the placement of clasps on the teeth in such a way that they provide retention, stability, and support for fixed partial dentures (FPDs). The clasps should be designed to minimize any detrimental effects on the supporting teeth, such as altering the occlusion or causing gingival irritation.

**Why the Correct Answer is Right:**

The correct answer (D) represents the current concept of clasp design in FPDs:

**Correct Answer: Clasp design should be based on the concept of minimizing stress on the supporting teeth.**

A clasp that is designed properly minimizes stress on the supporting teeth, ensuring retention, stability, and support for the FPD. This is achieved through the following principles:

1. **Clasp length:** The clasp length should be equal to the mesial and distal lengths to prevent tipping moments and minimize stress on the supporting teeth.
2. **Clasp shape:** The clasp should be designed as a U-shaped or semi-circular loop to minimize the stress on the teeth.
3. **Clasp position:** The clasp should be placed distally to the cusp tips and lingually to avoid altering the occlusion and causing gingival irritation.

**Why Each Wrong Option is Incorrect:**

A. Incorrect clasp design can cause stress on the supporting teeth, leading to periodontal problems and tooth fracture.
B. While the concept of minimizing stress on the supporting teeth is important, this option does not specifically mention the principles of clasp design (length, shape, and position).
C. This answer does not focus on the key principles of minimizing stress on the supporting teeth and considers other factors without explaining the specific design principles.
D. This option emphasizes the principles for minimizing stress on the supporting teeth, which is the correct answer.

**Clinical Pearl:** The current concept of clasp design in FPDs is based on minimizing stress on the supporting teeth. This ensures the longevity of the prosthesis and the health of the teeth participating in the retention, stability, and support of the FPD. Proper clasp design reduces the risk of periodontal problems and tooth fracture.