Zapata José Manuel, Leal Eduardo, Hunter Renato, de Souza Raphael Freitas, Borie Eduardo
Master in Dental Sciences Program, Universidad de La Frontera, Temuco PC 4811230, Chile.
Mechanical Engineering Department, Universidad de La Frontera, Temuco PC 4811230, Chile.
Materials (Basel). 2022 Dec 13;15(24):8903. doi: 10.3390/ma15248903.
Titanium (Ti) alloys used for narrow dental implants usually contain aluminum (Al) and vanadium (V) for improved resistance. However, those elements are linked to possible cytotoxic effects. Thus, this study evaluated the biomechanical behavior of narrow dental implants made with Al- and V-free Ti alloys by the finite element method. A virtual model of a partially edentulous maxilla received single implants (diameter: 2.7 and 2.9 mm; length: 10 mm) at the upper lateral incisor area, with respective abutments and porcelain-fused-to-metal crowns. Simulations were performed for each implant diameter and the following eight alloys (and elastic moduli): (1) Ti-6Al-4V (control; 110 GPa), (2) Ti-35Nb-5Sn-6Mo-3Zr (85 GPa), (3) Ti-13Nb-13Zr (77 GPa), (4) Ti-15Zr (113 GPa), (5) Ti-8Fe-5Ta (120 GPa), (6) Ti-26.88Fe-4Ta (175 GPa), (7) TNTZ-2Fe-0.4O (107 GPa), and (8) TNTZ-2Fe-0.7O (109 GPa). The implants received a labially directed total static load of 100 N at a 45° angle relative to their long axis. Parameters for analysis included the maximum and minimum principal stresses for bone, and von Mises equivalent stress for implants and abutments. Ti-26.88Fe-4Ta reaches the lowest maximum (57 MPa) and minimum (125 MPa) principal stress values, whereas Ti-35Nb-5Sn-6Mo-3Zr (183 MPa) and Ti-13Nb-13Zr (191 MPa) models result in the highest principal stresses (the 2.7 mm model surpasses the threshold for bone overload). Implant diameters affect von Mises stresses more than the constituent alloys. It can be concluded that the narrow implants made of the Ti-26.88Fe-4Ta alloy have the most favorable biomechanical behavior, mostly by mitigating stress on peri-implant bone.
用于窄型牙种植体的钛（Ti）合金通常含有铝（Al）和钒（V）以提高耐受性。然而，这些元素可能具有细胞毒性作用。因此，本研究通过有限元方法评估了不含铝和钒的钛合金制成的窄型牙种植体的生物力学行为。一个部分无牙上颌的虚拟模型在上颌侧切牙区域植入单个种植体（直径：2.7和2.9毫米；长度：10毫米），并分别连接基台和烤瓷熔附金属冠。对每个种植体直径以及以下八种合金（和弹性模量）进行了模拟：（1）Ti-6Al-4V（对照；110吉帕），（2）Ti-35Nb-5Sn-6Mo-3Zr（85吉帕），（3）Ti-13Nb-13Zr（77吉帕），（4）Ti-15Zr（113吉帕），（5）Ti-8Fe-5Ta（120吉帕），（6）Ti-26.88Fe-4Ta（175吉帕），（7）TNTZ-2Fe-0.4O（107吉帕），和（8）TNTZ-2Fe-0.7O（109吉帕）。种植体相对于其长轴以45°角承受100牛的唇向总静态载荷。分析参数包括骨的最大和最小主应力，以及种植体和基台的冯·米塞斯等效应力。Ti-26.88Fe-4Ta的最大（57兆帕）和最小（125兆帕）主应力值最低，而Ti-35Nb-5Sn-6Mo-3Zr（183兆帕）和Ti-13Nb-13Zr（191兆帕）模型的主应力最高（2.7毫米模型超过了骨过载阈值）。种植体直径对冯·米塞斯应力的影响大于组成合金。可以得出结论，由Ti-26.88Fe-4Ta合金制成的窄型种植体具有最有利的生物力学行为，主要是通过减轻种植体周围骨的应力。
