Implant platforms are circular in nature and generally exhibit a diameter of 3-6 mm, depending on the tooth to be restored. The mesial-distal dimension to be filled by the implant-supported crown (upper red line) will generally be considerably greater than the diameter of the implant platform (bottom center) and the difference between these two dimensions (orange arrows) is gained in the apico-coronal distance between the implant platform and the contact points of the two teeth adjacent to the edentulous space (red arrow) being restored by the implant. It is desirable that a greater proportion of this horizontal change in crown width be achieved in the vertical distance between the implant platform and the gingival margin (gumline) so as to achieve an emergence profile as similar to natural as possible. The vertical dimension between the implant platform and the gingival margin is termed running room.