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KMID : 0362120200420040348
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Journal of Technologic Dentistry
2020 Volume.42 No. 4 p.348 ~ p.354
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Comparison of stress distribution in bone and implant-supported dental prosthesis with zirconia and titanium implants: a 3-dimensional finite element analysis
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Hong Min-Ho
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Abstract
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Purpose: Zirconia is differentiated from other ceramics because of its high resistance tocorrosion and wear, excellent flexural strength (900~1400 MPa), and high hardness. Dentalzirconia with proven mechanical/biological stability is suitable for the manufacture of implants.
However, there are limited in vivo studies evaluating stress distribution in zirconiacompared with that in titanium implants and studies analyzing finite elements. This studywas conducted to evaluate the stress distribution of the supporting bone surrounding zirconiaand titanium implants using the finite element analysis method.
Methods: For finite element analysis, a single implant-supported restoration was designed.
Using a universal analysis program, eight occlusal points were set in the direction of the occlusallong axis. The occlusal load was simulated at 700 N.
Results: The zirconia implant (47.7 MPa) von Mises stress decreased by 5.3% in the uppercortical bone compared with the titanium implant (50.2 MPa) von Mises stress. Similarly,the zirconia implant (20.8 MPa) von Mises stress decreased by almost 4% in the cancellousbone compared with the titanium implant (21.7 MPa) von Mises stress. The principal stressin the cortical and cancellous bone exhibited a similar propensity to von Mises stress.
Conclusion: In the supporting bone, the zirconia implant is able to reduce bone resorptioncaused by mechanically transferred stress. It is believed that the zirconia implant can bea potential substitute for the titanium implant by reinforcing aesthetic characteristics andimproving stress distribution.
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KEYWORD
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Bite force, Dental Implants, Finite element analysis, Implant-supported dental prosthesis
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