I.) were used many years ago and the procedure has been abandoned for the more predictable intraosseous implant
. E.I. Are posts that were extended through the existing tooth root canal
into the surrounding bone, more deeply than a tooth root was designed to go. So your answer is **yes they can fail**
now, in more modern times, the entire tooth root is removed, allowing the bone to heal & solidify, thereby offering a greater, more stable foundation for support. These current implants are placed into the jaw bone & don't need to be any longer than a normal tooth root & will not jeopardize the health of the surrounding bone & structures, because they simply replace the tooth root. A porcelain tooth is attached to the implant & will look, feel & perform like a natural tooth.