When replacing more than one tooth, the same rules apply as for single teeth. However because the implants can be joined or splinted together with bridges, it is not always necessary to replace each tooth with an individual implant.
In the lower jaw, in order to replace all the teeth with a fixed bridge of natural looking teeth, between six and eight implants would be placed. To support a denture we would place between two and four implants. As a general rule, the greater the number of implants placed, the more fixed and natural the teeth will look.
The bone in the upper jaw is less dense and therefore generally multiple implants are required. To make the final teeth look natural they are angled outwards and therefore require more support. For a fixed bridge in the upper jaw eight implants might be needed.
With careful planning a patient can have all their failing teeth removed, multiple implants placed and a temporary bridge attached at the same appointment. Therefore not only are diseased and unsightly teeth removed but they can be replaced and a smile and health restored in one visit.