I'm curious if anyone has looked at the difference in enamel band thickness between the upper and lower teeth of any mammal, but more specifically ungulates.
The enamel isn't uniformly thick in upper or lower teeth, so I doubt you'll find any studies that have measures of this from exactly homologous points that could be comparable. Plus, a worn tooth is showing a section of an enamel band often at oblique sections, not a real measure of enamel thickness. And, that thickness will change from crown tip to base, so the real answer would be in estimating enamel thickness from something like microCT. That has been done with some primates and crocs, but not really for much in the context of ungulates, as far as I know. would be great to see done.
I may be too late to answer but you might find this paper useful -
I hope this helps.
Out of interest there have been several CT studies of equine teeth -such as http://onlinelibrary.wiley.com/doi/10.2746/042516409X390214/abstract and http://onlinelibrary.wiley.com/doi/10.2746/042516409X391033/abstract
There is some ongoing work involving micro CT of equine teeth but as far as I'm aware it is not yet published.
http://www.ncbi.nlm.nih.gov/pubmed/9234011
Recently published by Winkler and Kaiser: PeerJ. 2015 Jun 11;3:e1002. doi: 10.7717/peerj.1002. eCollection 2015, This paper might contain useful informations for you.
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