What is the recommended occlusal clearance for functional and nonfunctional cusps?

The recommended occlusal clearance for functional and nonfunctional cusps is typically established to ensure that there is adequate space for the materials used in prosthetics, along with providing proper function and stability for the dental restoration.

For functional cusps, which are the cusps that typically engage during occlusion and help in mastication, a clearance of around 1.5 mm is standard. This measurement allows sufficient space for the dental material while ensuring that the restoration can withstand the functional forces during chewing.

For nonfunctional cusps, which do not play a primary role during occlusion but can still contact opposing teeth, the recommended clearance is approximately 1 mm. This lesser clearance is adequate because these cusps do not bear the same loads as functional cusps and thus require less space.

Together, a clearance of -1.5 mm for functional cusps and 1 mm for nonfunctional cusps provides a balanced approach to occlusal design, ensuring both function and longevity of the prosthetic device. This recommendation aids in achieving a proper occlusion and stability in prosthetic dentistry.