Abstract

Objective: Numerically investigating different restorative materials effect on fixed dental prostheses stresses and deformation distributions on bone, cement, and prosthesis body.

Materials and Methods: Four different restorative materials; Porcelain Fused to Metal (PFM), Emax, Feldspathic porcelain and Poly-Ether-Ketone-Ketone (PEKK) were tested. A 3D finite element model was created by scanning plaster Model Bridge with missing maxillary first premolar. Mandibular bone augmented by two prepared abutments representing maxillary canine and second premolar. Compressive vertical load of 200N was applied at the central fossa of the pontic, while model base was fixed in place as boundary condition.

Results: Four linear static analyses were performed. Regardless the prosthesis material, maximum Von Mises stress was located on the abutment finishline towards the pontic. On the other hand maximum total deformation was found on abutment top towards the pontic.

Conclusion: Carful preparation of the finishline contact with fixed partial denture is a must to avoid stress concentration. Bone deformation and stresses were within physiological limits, while increasing fixed prosthesis material has slightly decreased bone stresses. Pure PEKK as fixed prosthesis material is not recommended due its high flexibility and deformation.

Keywords: Finite Element Analysis; Fixed Dental Prosthesis; Porcelain Fused to Metal; Emax; Feldspathic Porcelain; PEKK

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