Analysis of stress distribution in implant-supported prostheses with custom abutments at different angles of 20 degrees: A finite element analysis

Aim: Implants may not always be placed parallel to each other. In such cases, implants can be made more parallel by adjusting the angles with custom abutments. Different cementation materials can be used for cement-retained abutments. The bonding and stress resistance values of materials used in the cementation of implant-supported prostheses vary. The aim of this study is to demonstrate the stress distribution values of restorations bonded with different cementation materials in finite element analysis (FEA). Methodology: In this study, a maxillary edentulous jawbone was designed using the SolidWorks program. Two implants were placed in the regions of teeth #14 and #16. Implant data were obtained from the Bilimplant company. A 20-degree angled custom abutment and implant-supported prosthesis were designed using the Exocad program. Standard Tesellation Language (STL) files were transferred to SolidWorks to obtain Standard for the Exchange of Product Model Data (STP) files. The created prosthesis design was then transferred to the ABAQUS program for finite element analysis. Subsequently, using five different cementation materials (glass ionomer cement, dual-cure resin cement (Ivoclar), dual-cure resin cement (RelyX), polycarboxylate cement, and self-cure resin cement), stress distribution values of implant-supported prosthesis components were recorded as von Mises stress (VMS) values. Results: The results indicate higher stress values with glass ionomer cement and lower values with polycarboxylate cement. Stress distribution increases posteriorly but does not differ significantly based on cement type. The lowest stress on implant screws was found with glass ionomer, but the highest stress varied. Cortical bone stress is lowest with glass ionomer cement. Conclusion: No significant difference was found in stress values among different cement types. Stress increases in implants, abutments, and cements due to forces applied posteriorly, while anteriorly, retention screw stress increases. The choice of cementation material does not significantly impact stress in implant components or the surrounding tissues. How to cite this article: Karagöz M, Erdoğdu M, Mohammadi R, Tunçdemir AR. Analysis of stress distribution in implant-supported prostheses with custom abutments at different angles of 20 degrees: A finite element analysis. Int Dent Res 2024;14(S1):12-20. https://doi.org/10.5577/indentres.568