الفهرس 
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Abstract
Effect of Different Posterior Implants Angulations in Mandibular All-on-Four Design (Finite Element Analysis)
A finite element model will be used in this study to assess the pressure distribution in cases with implant-supported overdentures utilising a ”All-on-four” implant placement strategy at five various degrees of distal implant tilt.
Materials and Procedures The initial design of the mandible was produced from CBCT picture acquired from anonymous data archive, and the tilting degrees were measured for five models of implants preserved overdenture prosthesis (10o, 15 o, 20 o, 30 o and 45o). Principle stresses, where the maximum and lowest basic concept stress outcomes of the four models with the various tilting degrees were measured, and Calculated Theoretical stress induced in augmentations, multi-unit abutments, screws, bars, and dentures were recorded, were the two significant parameters used in the analysis of the models.
Results: The 45o group had the lowest main stresses surrounding the posterior implants (-21 N/mm2), while the 30o group had the highest principal stresses (-95 N/mm2), which were 4.6 times greater. When the stresses around hind implants were examined for the greatest primary stresses, the 10o cohort displayed the lowest tensile stress (12N/mm2) followed by the 45o group (17N/mm2).
The 10o group displayed the lowest tensile stress (12N/mm2) when the tensions around posterior devices were assessed. Maximum deformation stress (86N/mm2) were discovered at a 30o angle on the anterior implant. The 10o angle has the highest stresses on the dorsal implant (131/mm2). Peak stress measurements were taken from the 10o group’s anterior (90N/mm2) and posterior (407N/mm2) abutments. The posterior screws in the 45o group had the peak stresses (212 N/mm2). The 30o group in posterior screws had the highest von Mises strain (71 N/mm2).
Conclusion: Because of the lever arm effect generated by the cantilever length, tilting the downstream implants decreased the stress values in the occipito bone, implants, and abutment. Compared to other tilted groups, the posterior implants in the 45o group showed better stress distributions.
All-on-4, Sloped abutment, Finite-element analysis, Implant, Tilted prosthesis are some of the related terms.