School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran.
Med Eng Phys. 2024 Jan;123:104078. doi: 10.1016/j.medengphy.2023.104078. Epub 2023 Dec 7.
Dental implants have seen widespread and successful use in recent years. Given their long-term application and the critical role of geometry in determining fracture and fatigue characteristics, fatigue assessments are of utmost importance for implant systems. In this study, nine dental implant system samples were subjected to testing in accordance with ISO 14801 standards. The tests included static evaluations to assess ultimate loads and fatigue tests conducted under loads of 270 N and 230 N at a frequency of 15 Hz, aimed at identifying fatigue failure locations and fatigue life. Fatigue life predictions and related calculations were carried out using Fe-safe software. The initial model featured a 22° angle for both the fixture and abutment. Subsequently, variations in abutment angles at 21° and 23° were considered while keeping the fixture angle at 22°. In the next phase, the fixture and abutment angles were set as identical, at 21° and 23°. The results unveiled that when the angles of the abutment and fixture matched, stress values decreased, and fatigue life increased. Conversely, models featuring abutment angles of 21° and 23°, with a 22° angle for the fixture, led to a 49.1 % increase in stress and a 36.9 % decrease in fatigue life compared to the primary model. Notably, in the case of the implant with a 23° angle for both abutment and fixture, the fatigue life reached its highest value at 10 million cycles. Conversely, the worst-case scenario was observed in the implant with a 21° abutment angle and a 23° fixture angle, with a fatigue life of 5.49 million cycles.
近年来，牙种植体得到了广泛而成功的应用。鉴于其长期应用以及几何形状在确定断裂和疲劳特性方面的关键作用，对于种植体系统来说，疲劳评估至关重要。在这项研究中，按照 ISO 14801 标准对 9 个牙种植体系统样本进行了测试。测试包括静态评估，以评估极限载荷，以及在 270 N 和 230 N 载荷下以 15 Hz 的频率进行的疲劳测试，旨在确定疲劳失效位置和疲劳寿命。使用 Fe-safe 软件进行疲劳寿命预测和相关计算。初始模型中，固位体和基台的角度均为 22°。随后，在保持固位体角度为 22°的情况下，考虑了基台角度为 21°和 23°的变化。在下一阶段，将固位体和基台的角度设置为相同，分别为 21°和 23°。结果表明，当基台和固位体的角度相匹配时，应力值降低，疲劳寿命增加。相反，当基台角度为 21°和 23°，固位体角度为 22°时，模型的应力值增加了 49.1%，疲劳寿命减少了 36.9%，与初始模型相比。值得注意的是，在基台和固位体角度均为 23°的种植体中，疲劳寿命在 1000 万次循环时达到最高值。相反，在基台角度为 21°、固位体角度为 23°的种植体中，疲劳寿命最差，为 549 万次循环。
