Which occlusal feature is described as tall cusps and deep fossa, aiding stable occlusion?

• A. Tall cusps and deep fossa
• B. Anter ior Guidance
• C. Occlusal Load
• D. Absence of Posterior Interference

Answer: (A)

Stability in occlusion comes from precise interdigitation of the posterior teeth. Tall cusps and deep fossae create a strong, interlocking partnership between opposing teeth, so when the jaws close into the intercuspal position, the maxillary cusps seat deeply into the mandibular fossae and the mandibular cusps fit into the maxillary fossae. This interlocking locks the bite in a consistent, stable relationship and resists lateral or tipping forces during function. The deep fossae concentrate contact in a central area, helping to distribute occlusal loads along the teeth and supporting structures rather than creating shear on marginal ridges. In this way, the cuspal anatomy directly contributes to a stable occlusion by providing reliable, centralized contact and improved resistance to displacement during movement.