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Background and Objectives:Extrusion of the ossicular prosthesis into the eardrum has been a persisting a problem accom-panying ossiculoplasty. There are several factors concerning extrusion of the prosthesis, for instance, eardrum retraction, infection and the figure of the prosthesis, etc. Recently, many studies have been performed to evaluate the cause of extrusion; however, is to calculate the stress and strain of the eardrum and the prosthesis and to find the ideal model that prevents extrusion. Materials and Method:Three kinds of the imaginary total ossicular replacement prosthesis (TORP) were designed and biomechanicaly analyzed using the 3 dimensional finite element method. Equivalent stres and strains were measured and compared between the each group. The distribution of equivalent stress and strain on the eardrum and TORP were also observed. Results:The concave disc shows the smalest in value of the maximum equivalent stres & the maximum equivalent strain. In all eardrums, the stress was concentrated along the contact area with the disc margin, especially toward the center of the eardrum. In all TORPs, the upper 1/4 of the shaft and margin of the disc toward center of the eardrum was the most stress-concentrated area. Conclusion:These results indicate that concave disc could be the most suitable for preventing extrusion. (Korean J Otolaryngol 2003 ;46 :641-8)