Objective: This study was to assess the loading distributing characteristics of implant prosthesis according to position and direction of load, under vertical and inclined loading using FEA. Methods: Finite element model was designed according to standard fixture and crown for mandibular first molar was made using UCLA abutment. Each 3-dimentional FEM was created with the physical properties of the implant and surrounding bone. This study simulated each load of 200N at the central fossa in a vertical direction or 200N at the centric cusp in a 15 degree inward oblique direction or 200N at the centric cusp in a 30 degree inward oblique direction or 200N at the centric cusp in a 30 degree outward oblique direction individually. Von Mises stresses were recored and compared in the supporting bone, fixture, and abutment screw. Results: Bending moments resulting from non-axial loading of dental implants caused stress concentrations on cortical bone. An offset of the vertical occlusal force in the buccolingual direction relative to the implant axis gave rise to increased bending of the implant. The relative position of the resultant line of force from occlusal contact and the center of rotation seems to be more important. The magnitude of the stresses in the supporting bone, fixture and abutment screw was greater with the outward oblique loading than with the inward oblique loading and was the greatest under loading at the centric cusp in a 30 degree outward oblique direction. Conclusion: Bending moments resulting from non-axial loading of dental implants caused stress concentrations on cortical bone. But it seems to be more important that how long is the distance from the center of rotation of the implant itself to the resultant line of force from occlusal contact. The goal of improving implants should be to avoid bending of the mplant.

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