Which two anatomical features create an oblique ridge and which cusps are involved?

An oblique ridge is a prominent ridge found on the occlusal surface of certain teeth, primarily maxillary molars, formed by the combination of two triangular ridges that run in an oblique direction across the tooth.

The correct choice indicates that two triangular ridges—the mesiolingual (ML) and the distobuccal (DB)—contribute to the formation of the oblique ridge. The mesiolingual cusp is positioned toward the center of the tooth in relation to the buccal surfaces, while the distobuccal cusp is located towards the back on the buccal side. Together, these cusps create the characteristic slant of the oblique ridge, facilitating the interdigitation of the teeth during occlusion and contributing to the stability and function of the molar’s chewing ability.

Understanding this anatomical feature is crucial for identifying the morphology of teeth and their functional aspects in dental practice. The other options involve either the incorrect cusps or reference ridges that do not contribute to the formation of an oblique ridge, which emphasizes the importance of knowing the correct anatomical relationships in dental anatomy.