Objective:To compare the distribution characteristics of biomechanical stress on two techniques of zygomatic implant(ZI),sinus slot(SS)and extra sinus(ES),in combination with ultra-short implants respectively,so as to provide theoretical basis for functional restoration of severe atrophic maxilla.Methods:Finite element analysis(FEA)models were constituted based on high-resolution CT scanning data of a patient.ZIs were virtually placed into models with SS or ES techniques combined with two or four ultra-short implants.The von Mises stress values in implants and the principal stress values in alveolar bone were analyzed.Results:The highest von Mises stress was in the configuration of 2 ultra-short implants and 2 ZIs with ES technique(292 MPa).The lowest von Mises stress level in ZIs was seen in the configuration of 4 ultra-short implants and 2 ZIs with the SS technique(184 MPa).The highest maximum principal stress was in the configuration of 2 ultra-short implants and 2 ZIs with SS technique(31 MPa).The lowest maximum principal stress was in the configuration of 4 ultra-short implants and 2 ZIs with ES technique(12 MPa).The lowest minimum principal stress was in the configuration of 4 ultra-short implants and 2 ZIs with the SS technique(-58 MPa).The highest minimum principal stress value in alveolar bone was in the configuration of 2 ultra-short implants and 2 ZIs with ES technique(-81 MPa).Conclusion:Two ZIs with the SS technique and four ultra-short implants may be biomechanically safer for the rehabilitation of severe atrophic maxilla.
关键词
上颌骨重度萎缩/穿颧种植体/三维有限元分析/应力分布
Key words
severe atrophic maxilla/zygomatic implant/three-dimensional finite element analysis/stress distribution
维普
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