Chris Bormes, MICOI, gives an overview of the theory and criteria necessary to decide when to restore the edentulous arch with a fixed detachable, overdenture bar or overdenture stud prosthesis. He covers what information is necessary for treatment planning—such as smile line and dexterity—and when and why fixed detachable, fixed removable, overdenture bars and overdenture studs are indicated and contraindicated.