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KMID : 0362120210430030099
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Journal of Technologic Dentistry
2021 Volume.43 No. 3 p.99 ~ p.105
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Effect of tightening torque on the connection stability of a custom-abutment implant system: 3D finite element analysis
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Hong Min-Ho
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Abstract
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Purpose: This study aims to examine the stress distribution effect of tightening torques of different abutment screws in a custom-abutment implant system on the abutment-fixture connection interface stability using finite element analysis.
Methods: The custom-abutment implant system structures used in this study were designed using CATIA program. It was presumed that the abutment screws with a tightening torque of 10, 20, and 30 Nㆍcm fixed the abutment and fixture. Furthermore, two external loadings, vertical loading and oblique loading, were applied.
Results: When the screw tightening torque was 10 Nㆍcm, the maximum stress value of the abutment screw was 287.2 MPa that is equivalent to 33% of Ti-6Al-4V yield strength. When the tightening torque was 20 Nㆍcm, the maximum stress value of the abutment screw was 573.9 MPa that is equivalent to 65% of Ti-6Al-4V yield strength. When the tightening torque was 30 N·cm, the maximum stress value of the abutment screw was 859.6 MPa that is similar to the Ti-6Al-4V yield strength.
Conclusion: As the screw preload rose when applying each tightening torque to the custom-abutment implant system, the equivalent stress increased. It was found that the tightening torque of the abutment influenced the abutment-fixture connection interface stability. The analysis results indicate that a custom-abutment implant system should closely consider the optimal tightening torque according to clinical functional loads.
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KEYWORD
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Dental implnat-abutment connection, Dental prosthesis implantation, Finite element analysis, Screw, Torque
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