Hi Donna
I just saw your post on Community, I'm so sorry to hear this news.
I agree with Cheryl and CF about the torb. I know some people here have had problems with their cats being too "high" on tramadol (yowling, etc.) but I did use it after a dental for Dillon and didn't have a problem. He was jumping around like a kitten so I know it made him feel better. Tramadol is terribly bitter, though, so I would be reluctant to use it in an animal who has a mouth issue as you may have more problems getting it in and down the hatch without her tasting it.
As for Buprenex, it is a good pain medication but can be expensive in the long-term, esp. if you are going to give it constantly. Also regarding the dose: it is one of those weird medications where a higher dose (after a certain dose level) lasts longer, not necessarily provides more pain relief i.e. high-dose Buprenex can last 12 hours providing the same pain relief that a lower dose would for 4-8 hours. I know, it makes no sense! So I would ask your vet about dosing intervals.
Lastly, I would speak to your vet about transdermal options. I know that a few veterinary dentists use transdermal codeine, and someone on the board used it after her cat's dental too. (Gayle just posted about using it in her cat as well.) There is also transdermal Buprenex, actually, but I don't know the associated expense as compared to SQ Buprenex (and if you can give it directly, why use transdermal unless it's much cheaper and easier). Now there are no studies showing that either of these work, but anecdotally they seem to (including causing the eyes to dilate, a sure sign of opioid drug absorption) and transdermal meds are definitely easier to administer in a cat with mouth issues. I would consider it and ask about prices.