| In recent years, osseointegrated dental implants have become increasingly important in the field of oral rehabilitation. With the development of people’s living quality, the physiological function is not the only requirement that the patients ask for. Aesthetic needs such as reality and beautiful appearance should also be met.Zirconia, as a kind of structural ceramics, has excellent biocompatibility and mechanical properties. After sintering, zirconia has some transparence, whick looks just like human natural teeth, making it widely used in the field of prosthodontics. However, as a kind of ceramics, zirconia has the inherent brittleness and subcritical crack growth, making its long-term mechanical properties worse than it should be.Aiming to solve the problem of long-term mechanical properties being affected by the fatigue behavior of zirconia ceramic materials, this research is trying to lower the stress of zirconia abutment by changing the connection structures of implant and abutment. Thus the lifetime of the implant denture structure could be longer.To analyze the Straumann and COMLOG dental implant and abutment system, inclined loaded condition of dental implants was simulated by using finite element analysis. Three different models of Titanium abutment, Zirconia abutment and Zirconia abutment with Ti-base were calculated. 300 N inclined force loading by 30° angle was simulated in FEA software. The peak value of equivalent stress of all the systems was located at the implant-abutment surface. The peak value of maximum principal stress of Zirconia abutment without Ti-base was very close to the fracture strength of Zirconia, while that of Zirconia abutment with Ti-base was much lower.Furthermore, an experiment was conducted to prove the good mechanical properties of the denture structure using a Ti-base with Zirconia abutment. The failure load under 30° angle loading of Straumann and CAMLOG implant is 600 N and 950 N, respectively. |
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