Program of Dental Technicians, Istanbul University-Cerrahpasa, Istanbul, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey.
Comput Methods Biomech Biomed Engin. 2021 Nov;24(14):1606-1617. doi: 10.1080/10255842.2021.1903450. Epub 2021 Apr 2.
The purpose of the present study was to compare the stress distribution patterns of four materials used for the framework of All-on-4 prostheses. Following framework materials were evaluated: PEKK, PEEK, titanium, and monolithic zirconia. Bilateral 150 N axial and oblique loads were applied in the first molar region and analyzed using FEA. The highest maximum principal stress and minimum principal stress values in cortical bone were found to appear with PEKK and PEEK frameworks around the posterior dental implants upon oblique loading. The fabrication of frameworks from rigid materials in All-on-4 prostheses reduces stress in dental implants and peri-implant bone when the distal implants are tilted 30°.
本研究旨在比较用于 All-on-4 修复体支架的四种材料的应力分布模式。评估了以下四种支架材料：PEKK、PEEK、钛和整体氧化锆。在第一磨牙区域施加双侧 150N 的轴向和斜向载荷，并使用有限元法进行分析。结果发现，在斜向加载时，PEKK 和 PEEK 支架在后部牙种植体周围的皮质骨中出现了最高的最大主应力和最小主应力值。在 All-on-4 修复体中，使用刚性材料制造支架可降低远端种植体倾斜 30°时种植体和种植周骨的应力。
