Prosthodontic appliances, especially two types of fixed bridge-work, were simulated by means of 7 series of bar elements, cast in a gold alloy. Elastic deformation studies were made in a bench installation. Double exposure holographic interferometry was performed using a continuous helium-neon laser in which forces applied to the bar elements were increased between exposures. The effect of force increases up to 1.5 N could be determined by analyzing the resulting interference fringe patterns. In all, 170 double exposed holograms were evaluated and photographically documented. Differences in the deflection characteristics of the bars were studied with the aid of two composite histograms. Variations in the elastic deformation could be traced to technical reasons, such as the casting technique and the presence of soldered and screw-locked joints. The stiffening effect of internal ivory cylinders simulating teeth prepared as full-crown abutments was proved. The sensitivity of the method as well as the measuring range depend on the wave-length of helium-neon laser light (0.6328μml).