Which cusp of tooth #30 occludes with the central fossa of tooth #3?

Tooth #30 is a mandibular first molar, while tooth #3 is a maxillary first molar. In the context of occlusion, the relationship between opposing teeth is crucial for proper alignment.

The distobuccal cusp of tooth #30 is specifically designed to fit into the central fossa of tooth #3. This is because, during chewing and other occlusal movements, the cusps of the mandibular molars will interdigitate with the fossa and cusps of the maxillary molars. The anatomy of these teeth ensures that the cusps engage correctly to maintain occlusion and functional efficiency.

The mesial buccal cusp of tooth #30 engages with the mesial marginal ridge of tooth #3, while the lingual cusp does not interact significantly with the central fossa of a maxillary molar. The distal cusp of tooth #30 also does not correspond properly with the central fossa of tooth #3, as it is positioned more posteriorly.

Understanding this relationship is key for various clinical considerations, including occlusal adjustments, orthodontic treatment planning, and restorative procedures. Proper occlusion helps to distribute biting forces evenly and reduces the risk of undue wear or damage to the teeth.