Full arch dental implants could mean 4,5,6 or more implants. How many depends on what's needed in your case. A traditional denture can be attached to implants, and be removable by the patient. A hybrid denture (acrylic denture with metal frame underneath) can be attached to 4 or 5 implants and only be removable by the dentist. Traditional bridges can also be placed on implants as a denture alternative. Costs will vary depending on where you live. I practice in the Cleveland Ohio area and fees here are generally lower than say New York, Los Angeles or Chicago. As for implant prices, check around in your area, the fees will fall mostly within a certain range. You should try to find someone you trust within that price range. Fees that are unusually low often mean either cheaper non-brand name implant parts, offshore labs, lower quality materials, or inexperienced doctors are involved. There are many variables such as bone grafting, number of teeth, type of implants and type of crowns. In Cleveland, $4,200 for a single tooth (including surgery and restoration) would be a rough ballpark number for a single implant.