制造类型和老化对金属框架适合性的影响:一个体外微型CT研究
Kübra Tokay Kızılırmak1, Bahar Kavafoğlu Yılmaz2, Kaan Orhan3
1Prosthodontics, Private Clinic, Ankara, Turkey.
Clinical oral investigations
|April 25, 2025
概括
与传统造相比,计算机辅助制造方法,特别是激光烧结,为-框架提供了优越的边缘和内部适配. 热力学衰老的负面影响适用于所有技术,但计算机辅助方法显示不适合的增加更大.
科学领域:
- 牙科材料科学 牙科材料科学
- 生物材料工程 生物材料工程
- 牙修复 牙修复 牙修复 牙修复 牙修复
背景情况:
- 在凝固之前,牙修复的边缘和内部适合对于长期成功至关重要.
- 不同的制造技术和老化对- (Co-Cr) 金属框架的适合性的影响在科学文献中仍未得到充分研究.
- 了解随着时间的推移如何适应变化对于选择耐用制造方法至关重要.
研究的目的:
- 评估传统造,CAD/CAM削和激光烧结对Co-Cr金属框架边缘和内部适合性的影响.
- 通过微型计算机断层扫描 (Micro-CT) 来评估热力学衰老对这些框架的适应性的影响,模拟一年的临床使用.
主要方法:
- 使用三种不同的方法制造Co-Cr金属框架 (每组n=15):传统造,CAD/CAM削和激光烧结.
- 框架经历了一个模拟的陶燃烧过程来模仿临床条件.
- 应用了热力学老化,然后进行微CT分析以量化边际和内部差距. 统计分析包括ANOVA和Wilcoxon测试.
主要成果:
- 与传统造相比,计算机辅助制造技术 (CAD/CAM削和激光烧结) 显示出优越的边缘和内部适应性.
- 热机械老化显著增加了所有三种制造方法的不适合性.
- 激光烧结表现出最好的整体适合性,而传统造在老化前后都显示出最大的差距.
结论:
- 无论是生产技术还是热机械老化,都会显著影响用于牙科修复的Co-Cr金属基结构的适合性.
- 虽然老化在所有群体中都增加了不合适,但计算机辅助制造方法在老化后相比传统造时,不合适的增加比例更大.
相关概念视频
Fatigue
167
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...
167
Hooke's Law
320
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
320
Steel Manufacturing
347
Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
347
Structural Steel Products
125
Structural steel products are created within a structural mill. The process begins with a beam blank that is reheated and then fed through a series of rollers. These rollers progressively shape the metal into its final form. Adjusting the spacings between the rollers allows for the production of different sections with the same nominal dimensions.
Once shaped, the steel's final form emerges as a continuous length, which is then segmented by a hot saw into manageable pieces. These segments...
Once shaped, the steel's final form emerges as a continuous length, which is then segmented by a hot saw into manageable pieces. These segments...
125
Residual Stresses
189
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
189
Frames
483
Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
483


