An accurate, short method of fabricating intraoral radiotherapy prostheses has been described. With it, there is no need of mounting casts on an articulator, wax-up, or flasking. Almost all procedures can be accomplished by the dental technician. Most important, the prostheses can be ready for use a few hours after the impressions are made. The technician can prepare the walls and cylinders beforehand and keep them in stock until needed. Also, it would be advisable for the radiotherapist to be present at the initial fastening of the bases to the cylinders. In this manner, the accuracy of the function of the prosthesis will be assured.