The two main types of dental implants are endosteal implants and subperiosteal implants. Endosteal implants are placed directly into the jawbone and are the most common type of implant used. They are typically made of titanium and provide a stable foundation for artificial teeth. Subperiosteal implants are placed on top of the jawbone, beneath the gum tissue. They are used when there is not enough healthy jawbone to support endosteal implants.