使用数字遮分析仪对各种托盘设计进行印象制造过程中的压力分析:一项体外研究
Minji Sun1, Jaeyoung Kim2, Seojune Choi2
1Department of Prosthodontics, Ewha Womans University, Seoul, Republic of Korea.
概括
这项研究发现,牙印记托盘中的通风孔显著降低了压力,比调整托盘缓解提供了更一致的结果. 材料粘度和托盘设计是管理印记压力的关键因素.
科学领域:
- 牙科材料科学 牙科材料科学
- 生物医学工程 生物医学工程
- 牙修复 牙修复 牙修复 牙修复 牙修复
背景情况:
- 准确的牙印记对于假牙成功至关重要.
- 印象制作期间的过度压力可能会导致不准确性和患者的不适.
- 优化印象技术需要了解影响压力分布的因素.
研究的目的:
- 评估牙印记托盘中各种缓解条件和通风孔设计对压力产生的影响.
- 在印记过程中使用数字闭塞分析仪量化压力减小.
主要方法:
- 制造了定制的印记托盘,具有不同的浮雕 (0.5-3毫米) 和通风孔配置.
- 测试了两种不同的印记材料 (A和B).
- 使用数字闭塞分析仪 (T-Scan Novus) 测量相对压力,并计算压力减压比率.
- 采用双向ANOVA分析了缓解,材料和通风孔对压力降低的影响.
主要成果:
- 印记材料粘度和托盘缓解量都显著影响了压力降低 (p < 0.001).
- 材料A在3毫米的宽度下显示出更大的压力降低,而材料B的压力降低随着宽度的增加而增加.
- 喷气孔的配置显著影响了压力降低 (p < 0.001),较小,距离较远的孔产生了最大的降低.
结论:
- 牙印记压力受材料粘度和托盘设计的影响.
- 通风孔设计提供了比单独调整托盘减压更一致的减压.
- 使用合适的印记材料和优化压力减轻托盘设计的综合方法对于准确的牙印记至关重要.
相关概念视频
01:22Bearing Stress
Bearing stress refers to the contact pressure between two separate bodies. To visualize this, imagine a bolt thrust through a plate. The bolt applies a force to the plate, which exerts an equal but opposite force back onto the bolt. This force isn't just a singular entity but a compilation of numerous smaller forces distributed across the contact surface between the bolt and the plate.
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
01:10Stress-Strain Diagram
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This change in...
01:27Measurements of Strain
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...
01:15Design of Transmission Shafts - Stress Analysis
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...