Cretaceous Mammal Tooth

[PalaeoArt]

Hoping for a little expert help.

This looks like the lower premolar (blade) of a multituberculate but I was wondering if a local expert could help identify the species. I've spent a fair amount of time trying to ID based on O C Marsh cretaceous mammal plates, but can't place it. It's about 1/4" across and was found in the Lance Formation, Wyoming (so late cretaceous).Thanks in advance.

[Troodon]

Can you post additional images including the top of the crown hard to tell much with the two posted.   From theses images can it be the gator Brachychampsa

[PalaeoArt]

Thanks @Troodon. I've only got 2 more photos sadly as I don't have the tooth to hand. From the photos it's a thinner blade-like tooth like you'd get in a Multituberculate (rather than gater peg-shaped). I've compared this to a few (like Ptilodus or Cimolodon) but normally the striations in those pre-molars are more diagonal (rather than vertical).

[Troodon]

The base does not look like it has a double root but round.  Brachychampsa teeth are not peg shaped but oval and have the vertical striations.  Take a look at these photos and compare it to yours with the top of the shaved off.