Upon completion of occlusal reduction, what clearance should exist on the functional cusp?

The correct answer indicates that the appropriate clearance on the functional cusp after occlusal reduction should be -1.5 mm. This measurement is essential in prosthodontics because achieving the correct occlusal clearance helps ensure proper fit and function of the dental prosthesis, particularly when preparing for crowns or other restorations.

A clearance in the range of -1.5 mm allows sufficient space for the restorative material while maintaining the necessary occlusion. This ensures that there is enough bulk in the restoration to withstand the forces of occlusion and minimizes the risk of fracture or debonding once the prosthesis is placed. The accuracy of this spacing is crucial for achieving a balanced and functional bite, avoiding interferences.

Moreover, being too far above or below the recommended clearance can alter the mechanical properties of the restoration, leading to complications in function or adverse effects on the opposing dentition. Therefore, maintaining -1.5 mm of clearance is aligned with accepted standards and practices in prosthetic dentistry.