Learning Objectives: 1. To understand the mechanical effects of replacing the TM with other materials 2. To compare different materials used for reconstruction of the TM from a micromechanical sense. We will present our results in cadaveric temporal bones measuring the vibration responses of overlaying cartilage at different sites on the TM, replacing different parts of the TM with cartilage, with perichondrium, with silastic, and with ointment. We report both TM malleus vibrations and stapes

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... brations. Learning Objectives: Optimal prosthesis position at tympanic membrane and stapes; optimal prosthesis length; tension of annular ligament in middle ear reconstruction, tympanoplasty. Introduction: For an optimal sound transfer function (STF) positioning and coupling are the most important factors in middle ear reconstruction with passive implants. Middle ear ventilation problems can change the position and coupling of prosthesis after surgery leading to dislocation or tension of the ligaments. Therefore mechanism and techniques in prosthesis design had to be established to prevent dislocation and tension.