Where does DB Cusp of #30 occlude?

The DB cusp (distobuccal cusp) of the maxillary first molar, which is often designated as tooth #30, plays a specific role in the occlusion with opposing teeth. It primarily occludes in the central fossa of the mandibular second premolar, commonly referred to as tooth #3 in this context.

Understanding the functional relationships in occlusion is essential, especially when considering how cusps interdigitate. The central fossa provides an ideal area for the DB cusp of #30 to engage with the opposing tooth, facilitating proper mastication and occlusal stability.

In this scenario, the remaining options do not represent the correct relationship. The buccal fossa of #4 (the maxillary first molar) or the distal fossa of #5 (the maxillary second molar) may receive contact from other parts of the #30 but not from the DB cusp specifically. Likewise, the lingual fossa of #2 (the mandibular first molar) is more likely to interact with the palatal aspects of the maxillary molars rather than the DB cusp in particular. Therefore, recognizing that the central fossa is the primary contact area explains why the identified answer is the most accurate in this