National Board Dental Examination (NBDE) Part I II (Discontinued, Replaced By INBDE)

The oblique ridge on a permanent maxillary first molar is a prominent feature formed by the union of which two ridges?

Mesiobuccal cusp's triangular ridge and the Mesiolingual cusp's triangular ridge Distobuccal cusp's triangular ridge and the Mesiolingual cusp's triangular ridge Mesiobuccal cusp's triangular ridge and the Distolingual cusp's triangular ridge Distobuccal cusp's triangular ridge and the Distolingual cusp's triangular ridge

Correct Answer:

Distobuccal cusp's triangular ridge and the Mesiolingual cusp's triangular ridge

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