Ti-6Al-4V ELI植入器的旋转负荷疲劳性能,具有一个尺寸的植入器-口连接
The International journal of oral & maxillofacial implants
|January 12, 2026
概括
牙植入物疲劳性能在各种直径和部设计中进行了测试. 没有发现任何显著的差异,但发生了支柱和螺杆骨折,可能会使假肢更换复杂化.
科学领域:
- 生物材料科学 生物材料科学
- 牙科植入物学 牙科植入物学
- 机械工程 机械工程
背景情况:
- 像Ti-6Al-4V ELI这样的合金由于其生物相容性和机械性能,在牙科植入物中被广泛使用.
- 一个尺寸的植入物-支架 (OSIA) 连接旨在简化植入物-支架接口.
- 了解不同植入物配置的疲劳性能对于长期的临床成功至关重要.
研究的目的:
- 为了评估不同直径和部设计的Ti-6Al-4V ELI牙科植入物的旋转负载疲劳性能.
- 评估植入物直径 (窄,正规,宽) 和部设计 (RG,PX) 对OSIA系统中的疲劳寿命的影响.
- 在循环负载条件下识别故障模式.
主要方法:
- 六组Ti-6Al-4V ELI植入物 (3.4mm,4.0mm,4.6mm直径;RG和PX项设计) 使用旋转负载疲劳机进行了测试.
- 标本在45°处承受了侧面负荷,在10Hz时产生了35Ncm的曲时刻.
- 记录了故障周期的数量,并使用SEM和横截面分析了故障模式.
主要成果:
- 所有30个标本都失败了,平均周期从523,674到1,282,373.3不等.
- 没有发生植入物骨折;故障始终涉及植入物平台的支柱骨折,伴随着螺杆骨折.
- 基于植入物直径 (P=.272) 或部设计 (P=.861) 的双向ANOVA显示,疲劳寿命没有统计学上显著的差异.
结论:
- 植入物直径和部设计没有显著影响具有OSIA连接的Ti-6Al-4V ELI植入物的疲劳性能.
- 主要的故障模式是支架和螺杆骨折,这可能会给假肢检索和更换带来挑战.
- 进一步研究优化植入物 - 支架接口设计是有必要的,以减轻故障风险.
相关概念视频
Fatigue
792
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
792
Thin-Walled Hollow Shafts
527
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
527
Pivot Bearings
2.1K
In mechanical systems, bearings are crucial in facilitating relative motion between two components while minimizing friction and wear. They help distribute various loads (radial, axial or a combination of both loads) across machinery parts, ensuring smooth and efficient operation.
A pivot bearing is a specialized type of bearing designed to support axial loads on a rotating shaft. The bearing surface, or the pivot, is positioned at the end of a shaft to support the axial thrust. The pivot may...
A pivot bearing is a specialized type of bearing designed to support axial loads on a rotating shaft. The bearing surface, or the pivot, is positioned at the end of a shaft to support the axial thrust. The pivot may...
2.1K
Deformation in a Circular Shaft
844
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
844
Stress Concentrations in Circular Shafts
535
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
535


