DcS said:
1. Nothing
2. Partial...yes it's possible
3. Implants
4. One or two implants and then a FPD from that implant to the canine
#4 is absolutely wrong. You cannot use an implant and a tooth as abutments for the same bridge. Strong contraindication.
As for a partial, it's not ideal, but it could work. Are we talking max or mand? The 2nd premolar is on the partially edentulous right side as well, right? Can you crown the premolar/root with a post and core while retaining good solid root structure? My guess is probably not from the way you describe. Plus how's the perio around the premolar/root? Any mobility or pockets? Unless it's pretty rock solid you can't use that as an abutment for an RPD. And then you're left with trying to clasp the canine assuming it isn't perio involved as well. You can do it, but keep in mind there will be quite a bit of torque on whatever you have on the right side, and any abutment would have to be pretty solid. Also consider the perio involvement of the remaining teeth. Is it maintainable? Cause you're about 1 tooth away from a complete denture.
Certainly if they have the funds and anatomy to support implants you could place 3-4 single tooth implants. Even if you did a bridge with implants you'd still need 3 for an adequate tripod.