The crucial factors in deciding whether a fixed or removable prosthesis should be planned will influence the entire treatment plan, including implant positioning and flange considerations. Most factors, precluding the use of a fixed implant-supported restoration, are related to osseous and/or soft tissue deficiencies. The resorptive processes can cause prognathism, the need for facial support, speech disruption, and/or esthetic problems. So, any parameter that would rule out a fixed reconstruction should be assessed in the sagittal and vertical planes with the help of awax try-in. The first...