Experimental validation of a finite element model of the temporomandibularjoint

Purpose: A 2-dimensional finite model of the temporomandibular joint (TMJ) was previously developed to provide a way of studying the specific roles of individual components as well as the overall dynamics of joint motion. Thi s study was undertaken to show that the previously reported finite element model provides results that are consistent with the experimentally obtained results. Materials and Methods: The upper compartment of a TMJ of a fresh cadaver sp ecimen was exposed to allow the insertion of a small strip of pressure-sens itive Nm. Measured loads were applied to the chin and angle of the mandible , pressing the condyle into the glenoid fossa, The resulting stresses in th e joint stained the Nm, providing a way to determine their magnitude, Simil ar loads were applied to the finite element model and the stresses in the T MJ were mathematically calculated. Results: Experimental results were successfully obtained in 4 separate atte mpts, recording maximum stresses of 5.6, 8.6, 6.4, and 9.9 MPa (megapascals ), respectively. The corresponding finite element model predictions were 7. 3, 6.9, 6.4, and 8.2 MPa, respectively. Conclusions: This study indicates that the results of the previously report ed finite element model of the TMJ provide a reasonable approximation of th e actual physical situation. (C) 2001 American Association of Oral and Maxi llofacial Surgeons.