A flanged interbody spinal fusion implant for insertion at least in part between adjacent vertebral bodies has opposed upper and lower surfaces adapted to contact each of the adjacent vertebral bodies from within the disc space, a leading end for insertion between the adjacent vertebral bodies, and a trailing end opposite the leading end. The method also comprises applying the first-principles radiation model to modify the rapid thermal processing performed in the rapid thermal processing step. The measurement device may include an illumination system and a detection system. A drive motor is connected to a common drive shaft for simultaneously rotating respective gear units.