If an implant is categorized as endosseous, where is it placed?

An endosseous implant is specifically designed to be placed inside the jawbone. This type of dental implant provides stability and support for the prosthetic teeth, as it integrates with the bone tissue through a process known as osseointegration. The placement within the jawbone allows for a strong foundation, enabling the implant to withstand the forces of chewing and other dental functions effectively.

The other options refer to different placement scenarios that are not characteristic of endosseous implants. For example, placing an implant under the gum tissue or above the gum line would not provide the necessary support and integration expected from endosseous designs. Additionally, implants placed on the surface of the bone would not offer the same level of stability and long-term success as those that are embedded within the jawbone. Thus, the categorization of an implant as endosseous clearly indicates its placement within the jawbone itself.