The retentive points of the Adam clasp should be angled at 45° to the bridge portion to provide optimal flexibility and retention. This angle allows the clasp to engage the undercut effectively without exerting excessive force, thus minimizing trauma to the abutment teeth. A 45° angle ensures the clasp’s retentive arm can flex during insertion and removal, improving mechanical retention while maintaining patient comfort. Angles less than 45° may reduce retention, and angles greater than 45° increase rigidity, risking tooth mobility or damage. Therefore, 45° is the ideal angle for functional and protective clasp design.

Reference: Stewart’s Clinical Removable Partial Prosthodontics, 4th Edition.