PDF(Pubmed)
Abstract：
BACKGROUND: Mechanical complications affect the stability of implant restorations and are a key concern for clinicians, especially with the frequent introduction of new implant designs featuring various structures and materials. This study evaluated the effect of different prosthetic index structure types and implant materials on the stress distribution of implant restorations using both in silico and in vitro methods.
METHODS: Four finite element analysis (FEA) models of implant restorations were created, incorporating two prosthetic index structures (cross-fit (CF) and torc-fit (TF)) and two implant materials (titanium and titanium-zirconium). A static load was applied to each group. An in vitro study using digital image correlation (DIC) with a research scenario identical to that of the FEA was conducted for validation. The primary strain, sensitivity index, and equivalent von Mises stress were used to evaluate the outcomes.
RESULTS: Changing the implant material from titanium to titanium-zirconium did not significantly affect the stress distribution or maximum stress value of other components, except for the implant itself. In the CF group, implants with a lower elastic modulus increased the stress on the screw. The TF group showed better stress distribution on the abutment and a lower stress value on the screw. The TF group demonstrated similar sensitivity for all components. DIC analysis revealed significant differences between TF-TiZr and CF-Ti in terms of the maximum (P < 0.001) and minimum principal strains (P < 0.05) on the implants and the minimum principal strains on the investment materials in both groups (P < 0.001).
CONCLUSIONS: Changes in the implant material significantly affected the maximum stress of the implant. The TF group exhibited better structural integrity and reliability.
METHODS: Four finite element analysis (FEA) models of implant restorations were created, incorporating two prosthetic index structures (cross-fit (CF) and torc-fit (TF)) and two implant materials (titanium and titanium-zirconium). A static load was applied to each group. An in vitro study using digital image correlation (DIC) with a research scenario identical to that of the FEA was conducted for validation. The primary strain, sensitivity index, and equivalent von Mises stress were used to evaluate the outcomes.
RESULTS: Changing the implant material from titanium to titanium-zirconium did not significantly affect the stress distribution or maximum stress value of other components, except for the implant itself. In the CF group, implants with a lower elastic modulus increased the stress on the screw. The TF group showed better stress distribution on the abutment and a lower stress value on the screw. The TF group demonstrated similar sensitivity for all components. DIC analysis revealed significant differences between TF-TiZr and CF-Ti in terms of the maximum (P < 0.001) and minimum principal strains (P < 0.05) on the implants and the minimum principal strains on the investment materials in both groups (P < 0.001).
CONCLUSIONS: Changes in the implant material significantly affected the maximum stress of the implant. The TF group exhibited better structural integrity and reliability.
摘要：
背景：机械并发症会影响植入物修复体的稳定性，并且是临床医生关注的重点，特别是随着频繁引入具有各种结构和材料的新植入物设计。本研究使用计算机模拟和体外方法评估了不同假体指数结构类型和植入物材料对植入物修复体应力分布的影响。
方法：创建了四个种植体修复体的有限元分析（FEA）模型，结合两种假体指数结构（交叉配合（CF）和Torc配合（TF））和两种植入材料（钛和钛锆）。对每组施加静载荷。使用数字图像相关（DIC）的体外研究与FEA相同的研究方案进行验证。主要菌株，敏感性指数，并使用等效的冯·米塞斯压力来评估结果。
结果：将植入物材料从钛改为钛锆并没有显着影响其他组件的应力分布或最大应力值，除了植入物本身。在CF组中，具有较低弹性模量的植入物增加了螺钉上的应力。TF组的基台应力分布较好，螺钉应力值较低。TF组对所有组分表现出相似的灵敏度。DIC分析显示，TF-TiZr和CF-Ti在植入物上的最大主应变（P<0.001）和最小主应变（P<0.05）以及两组投资材料上的最小主应变方面存在显着差异（P<0.001）。
结论：植入材料的变化显著影响了植入物的最大应力。TF组表现出更好的结构完整性和可靠性。
方法：创建了四个种植体修复体的有限元分析（FEA）模型，结合两种假体指数结构（交叉配合（CF）和Torc配合（TF））和两种植入材料（钛和钛锆）。对每组施加静载荷。使用数字图像相关（DIC）的体外研究与FEA相同的研究方案进行验证。主要菌株，敏感性指数，并使用等效的冯·米塞斯压力来评估结果。
结果：将植入物材料从钛改为钛锆并没有显着影响其他组件的应力分布或最大应力值，除了植入物本身。在CF组中，具有较低弹性模量的植入物增加了螺钉上的应力。TF组的基台应力分布较好，螺钉应力值较低。TF组对所有组分表现出相似的灵敏度。DIC分析显示，TF-TiZr和CF-Ti在植入物上的最大主应变（P<0.001）和最小主应变（P<0.05）以及两组投资材料上的最小主应变方面存在显着差异（P<0.001）。
结论：植入材料的变化显著影响了植入物的最大应力。TF组表现出更好的结构完整性和可靠性。
