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Purpose: The present study is an in-vitro study conducted to evaluate the stress distribution pattern in bone surrounding splinted & non-splinted implants in implantretained maxillary obturators with Ball & Hader bar attachment systems using three dimensional FEA. Materials & Methods: CT scan was made for a completely edentulous patient with class I maxillary defect. The CT scan file was sent to a personal computer with Materialize Mimics 10.01 program (Materialize, interactive medical image (Materialize Leuven, Belgium). Mimics was used to modify the CT scan of the maxilla to construct 3-D model with Solid Works, Concord, Massachusetts, USA) for 3-D FEA. All components of the models were simulated & constructed after that and they were superimposed until construction of the model of the maxillary obturator. Three implants were inserted in the alveolar bone on the intact side, one adjacent to the defect , one at the canine area and one at the 2nd premolar area. Ball attachments & Hader bar & clips attachment systems were simulated according to the manufacturer structural configurations. A static load of 100 N load was applied vertically & obliquely on the defect side. ANSYS program (Canonsburg, PA, USA) was utilized to solve the problems. Von Misses stresses in bone surrounding implants were evaluated and compared in the two study models. Results: The highest Von Misses stresses were found in cortical bony layers around the implant adjacent to the defect & the least stresses at the area of 3rd implant. Ball attachment retained implant obturators had recorded the least Von Misses stresses (40.762 Mpa, 26.175 Mpa & 10.62) & (41.484 Mpa, 28.656 Mpa & 15.585 Mpa) around the 1st, 2nd & 3rd implants respectively. Meanwhile, the Hader bar & clip attachment systems (43.526 Mpa, 29.17 Mpa & 8.6 Mpa) and (53.802 Mpa, 30.5 Mpa & 9.6 Mpa) under vertical & oblique load application around the 1st, 2nd & 3rd implants respectively. All models had shown the highest stresses on oblique load application on the defect side. (3654) Mohamed Abdel Hakim Abdel Aal E.D.J. Vol. 65, No. 4

egyptian dental journal /egyptian dental journal

Three Dimensional Finite Element Analysis Of The Stresses Induced In Bone Surrounding Splinted &amp; Un-Splinted Implants In Implant Retained Maxillary Obturators For Completely Edentulous Maxillectomy Patients