Use of the transitional denture for patients who will receive osseointegration treatment provides several distinct advantages. (1) As a diagnostic tool it is used to establish the correct occlusal vertical dimension, appropriate lip and cheek support, and to assess other esthetic and phonetic factors. (2) It functions as an interim prosthesis. (3) It provides guidelines via surgical guidestents for fixture location and angulation. (4) Also, it can become an integral part of the conversion prosthesis.