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Stress distribution of implant retained obturators using different types of attachments: A three dimensional finite element analysis

ABSTRACT

Publication date: Available online 2 November 2015 Source:Tanta Dental Journal Author(s): M.M. Amer, H.A. Rashad, S. Abdallah

Objectives The objective of this study was to analyze the stress distribution around dental implants for different designs of implant supported obturator in cases of midline maxillary defect using a 3-dimensional finite element analysis. Methods A model of edentulous patient with midline maxillectomy is transferred to digital (CAD) model using 3D coordinate measuring machine, Finite element models were formed using ABAQUS package, creating 3 models rehabilitated with different designs of implant retained obturator prostheses using different attachment types of dental implants in the alveolar bone on the unaffected side, three implants with ball& socket, magnet and bar & clips. A 100 N load was applied bilateral vertically and unilateral vertically and obliquely on the defect side, and von Mises stresses in the cortical bone around implants were evaluated and compared. Results All the models showed the highest stress values under oblique load that applied on the defect side around the most anterior implant, the ball & socket models exhibited the lowest stresses followed by the magnet then the bar & clips models which showed the highest stress values.