An effective clasp assembly must engage more than 180° of the greatest circumference of the crown to ensure optimal retention and stability. Covering over half the circumference allows the clasp to resist dislodging forces better, providing a firm mechanical grip on the tooth. This design maximizes retentive arm flexibility while maintaining adequate tooth protection, preventing unwanted movement of the prosthesis during function. Less coverage would reduce retention and increase the risk of clasp deformation or tooth damage. Therefore, more than 180° coverage is essential for durable and functional clasp performance.

Reference: Prosthodontics, Anil Chandra, 1st Edition.