A subperiosteal implant is placed onto the bone rather than into the bone, similar to a saddle. This type of implant is used most often to cover a large surface area, such as a completely edentulous mandible where there has been a severe amount of bone resorption and not enough bone to support endosteal implants. Although most of the implant structure is under the gum tissue, posts or bars remain exposed above the gums. The superstructure (denture or partial) attaches to these posts.
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