Which feature is not associated with the occlusal surface of a permanent maxillary molar?

The distobuccal ridge is not a feature commonly associated with the occlusal surface of a permanent maxillary molar. In contrast, the other features listed are integral parts of the anatomy of maxillary molars.

The occlusal surface of a permanent maxillary molar includes the distomarginal ridge, which is a boundary at the distal margin of the tooth; the oblique ridge, which runs diagonally across the occlusal surface from the mesiolingual cusp to the distobuccal cusp; and the cusp of Carabelli, a unique cuspal formation present on the mesiolingual cusp of some maxillary first molars.

Understanding these features is crucial for proper identification and treatment planning in restorative and surgical dentistry, highlighting the distinct morphology of maxillary molars and their functional significance in occlusion.