for subperiosteal implants, what is the first, second, and third step?
first: surgical incision to expose bony ridge. impression of the bony ridge is taken. the surgical wound is closed
second: a replica is made of the bony ridge from the impression. the metal framework is cast in the lab. it has metal projections that will extend through the tissues.
third: a second incision to reopen the initial wound is made. the implant framework is inserted over and under the periosteum. the tissues are sutured closed and the projections are showing in the oral cavity.