Title: Effect of alveolar bone support on zygomatic implants in an extra-sinus position – an FEA study
Authors: Freedman, Michael; Ring, Michael; Stassen, Leo F.A.
Abstract: Objective: To investigate the influence of maxillary alveolar bone on the stress distribution
of zygomatic implants in an extra-sinus position. Materials & Methods: A threedimensional
finite element model was created based on a CT scan of an edentulous female
patient. Two zygomatic implants were modelled and placed in the skull in an extrasinus
position. These were supported by the zygomatic bone and the maxillary alveolar
bone and were connected by a fixed bridge. This model was duplicated, and the area of
the maxillary alveolar bone supporting the implants was removed. Occlusal and lateral
forces were applied to both models and the maximum von Mises stresses were recorded.
Results: Higher maximum stresses were noted in the model with no alveolar support.
Occlusal stresses were higher than lateral stresses in the model with no alveolar support,
while occlusal stresses were lower than lateral stresses in the model with alveolar support.
Low stresses were noted in the zygomatic bone in both models. Conclusion: Maxillary
alveolar bone support is beneficial in the distribution of forces for zygomatic implants
placed in an extra-sinus position.
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