Second maxillary premolar (ridges)

The second maxillary premolar has the same named ridges as in the first maxillary premolar, and they include the following: buccal triangular ridge, lingual triangular ridge, buccal cusp ridge, distobuccal cusp ridge, distal marginal ridge, distolingual cusp ridge, mesiolingual cusp ridge, mesial marginal ridge, and mesiobuccal cusp ridge.