Hi,
If your vet is familiar with injectable anesthesias for rabbits.....that is much better for oral procedures in lieu of masking for gas, then they wake up, then mask again, etc. Injectable allows more precise sedation and is reversible with an injection of reversing agent. I would assume your vet is prepared to perform a float if necessary while in there. If gas is used and you have a choice.....go with Sevoflurane instead of Iso. Sevo is usually more expensive but is a quicker in, quicker out gas.Sedation is the best way to get a really good look at those molars. Keep in mind that a visual is a companion to appropriate radiographs to look at the roots and structure of the jaw bone itself.
Randy