Citation Information :
Duseja S, Patel V, Jivani D. Effect of Different Implant Internal Crest Module Designs on Abutment Stability and Screw Passivity: A Finite Element Analysis. Int J Prosthodont Restor Dent 2022; 12 (4):185-190.
Purpose: The purpose of this finite element analysis (FEA) was to comparatively assess implant stability, abutment stability, and screw passivity in dental implants with different internal connections and guide in their selection process.
Materials and methods: Three widely accessible types of internal implant-abutment connections served as the study's foundation. Lengths of 9.5 and 11 mm and diameters of 3.5 and 4.1 mm were selected with three different internal abutment attachment crest module designs. The three designs studied were: hex with a 45° bevel, octagon with a reverse 82° bevel, and trilobe with a butt joint. Young's modulus and Poison's ratio were used to allocate the various structures employed in the FEA model to their respective materials. An axial load of 35 N was applied over the abutment, and a 70 N load was applied non-axially. Moreover, a 10 N horizontal load was also applied. Overall displacement and stresses in bone, implant, and screw were calculated using Analysis of Systems (ANSYS) software.
Results: It was found that on the application of 35 N vertical load, almost all the models showed similar overall displacement. The oblique load of 70 N also showed not much difference in overall displacement in all models. However, the overall stress concentration was slightly higher (125.87 MPa) in model 3 with the trilobe butt joint design. Overall implant stress is lowest (121.3 MPa) in model 2 with an octagonal design. Octagonal type of internal connection showed better screw passivity and abutment stability under axial as well as nonaxial loading.
Conclusion: Abutment stability, as well as implant stability, is more with octagonal internal connection design. Moreover, inner screw stress is lowest in the octagonal design as compared to the other two designs, with the highest stress in the trilobe butt joint connection.
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