o Diamond shaped occlusal outline
o One very large (buccal) and one very small cusp (lingual). In fact, since the L cusp is so small, we can see the entire occlusal surface when looking this tooth from the lingual.
o The mesiolingual line angle is almost flat, while the distolingual line angle is rounded. This leads to a very narrow mesial surface and makes easy to identify if it is a left or right tooth.
o This tooth also presents an unique mesiolingual groove, which comes from the mesial pit, crosses the mesial marginal ridge into the mesiolingual line angle
o It is the only posterior tooth that may have the mesial marginal ridge closer to the cervical line than the distal marginal ridge
o The mesial root groove is common on this teeth
o There are two prominent pits (mesial and distal), which can be used to differentiate these teeth from canines. These pits are the apexes for the mesial and distal fossae
o The buccal and lingual triangular ridges are connected, creating an unique transverse ridg
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