超薄闭合面板的断裂负荷:厚度和表面条件的影响
Maged Zahran1, Shaimaa Abo El-Farag1, Hassan Soltan2
1Department of Fixed Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura 35516, Egypt.
概括
较厚的陶密封面板 (1.0毫米) 和酸 (HF) 表面处理显著提高了断裂抵抗力. 这些发现表明,最优的材料选择和准备用于持久的牙科修复.
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
- 恢复性牙科 恢复性牙科
背景情况:
- 牙修复需要高的骨折抵抗力来承受闭塞力.
- 陶封闭面板是一种常见的修复选项,但它们的机械性能可能会受到厚度和表面处理的影响.
- 优化面膜设计对于长期的临床成功至关重要.
研究的目的:
- 评估不同厚度的陶密封面板 (1.0毫米对0.5毫米) 对断裂阻力的影响.
- 评估不同表面处理 (含酸,酸化酸化物,蚀刻和原料) 对板耐用性的影响.
- 为了确定厚度和表面处理的最佳组合,以提高抗破裂性.
主要方法:
- 在实验室中使用48个健全的下牙进行研究.
- 在两个厚度 (1.0毫米和0.5毫米) 的CAD/CAM陶增强玻璃陶面板的制造.
- 应用三种表面处理方法:酸 (HF),酸化酸化物 (APF) 和蚀刻和原料 (EP).
- 使用双固化树脂水泥进行粘合粘合.
- 动态负载老化 (240,000 个周期) 随后进行断裂耐力测试 (以牛顿计).
- 使用扫描电子显微镜 (SEM) 进行故障模式分析.
- 使用双向ANOVA和邦费罗尼后期试验进行统计分析.
主要成果:
- 板厚度和表面处理都显著影响了断裂阻力 (p<0.05).
- 观察到的最高平均断裂阻力 (2672±216 N) 是用 1.0 毫米 HF 处理的面膜.
- 最低的平均断裂阻力 (2104±299 N) 发现在0.5毫米的APF处理面膜上.
- 所有测试组都超过了正常和非功能性咬力.
结论:
- 修复厚度和表面条件是影响陶面板断裂耐力的关键因素.
- 酸蚀刻,然后应用陶原料,提供了优越的断裂阻力和有利的故障模式.
- 这些发现支持使用更厚的面板,并进行适当的表面处理,以提高牙修复的寿命.
相关概念视频
Veneer
108
Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...
108
Fatigue
208
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...
208
Behavior of Concrete Under Compressive Load
218
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
218
Stress-Strain Diagram - Brittle Materials
2.6K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.6K
Fractures: Bone Repair
3.4K
Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
3.4K
Flexural Stress
328
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to...
328


