一个假设测试的弧线圆对扭矩弹在正牙科的有效性:一个有限元素研究研究
Blend H Balisany1, Omar F Chawshli1, Zana Q Omer1
1Pedodontics, Orthodontics and Preventive Dentistry, College of Dentistry, Hawler Medical University, Erbil, IRQ.
Cureus
|April 1, 2024
概括
圆圆的矩形弧线显著提高了沃伦扭矩弹在正牙科的效率,导致更大的牙运动. 较小的线尺寸提供了更大的扭矩,改善了正结果和稳定性.
科学领域:
- 矯正牙科 矯正牙科是一種矯正牙科.
- 生物机械工程 生物机械工程
- 牙科材料科学 牙科材料科学
背景情况:
- 实现精确的口舌牙倾斜对于最佳的闭塞和长期的正牙稳定性至关重要.
- 有效的扭矩表达对于理想的牙定位在所有三个空间平面中至关重要.
- 目前的文献缺乏关于修改带有扭矩弹的矩形弧线的生物力学影响的全面数据.
研究的目的:
- 为了调查Burstone关于沃伦扭矩弹的假设,使用矩形电线.
- 为了检查支架翼之间的圆弧电线对扭矩表达的影响.
- 确定这些修改对正义牙科治疗结果的影响.
主要方法:
- 一个3D模型的牙被用于模拟.
- 标准的正牙支架 (0.022"MiniSprintTM) 和矩形不钢弧线 (0.019"×0.025"和0.017"×0.025") 被使用.
- 沃伦扭矩弹在右上方的中央切口上模拟了四种场景:每个尺寸的未触及和圆形弧线.
主要成果:
- 圆弧线显著增加了根尖位移:0.019"×0.025"为1538%,0.017"×0.025"为783%.
- 对于圆形电线,观察到更大的位移 (18.8毫米为0.017"×0.025",12.2毫米为0.019"×0.025").
- 压力集中在沃伦扭矩弹的子上,与线圈相邻.
结论:
- 圆圆的矩形弧线增强了沃伦扭矩弹的效率,增加了牙扭矩.
- 当与沃伦扭矩弹一起使用时,较小的矩形弧线尺寸会产生更大的扭矩.
- 这些发现为优化正扭矩控制和治疗效率提供了实际见解.
相关概念视频
01:18Stress Concentrations in Circular Shafts
172
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...
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01:10Residual Stresses in Circular Shafts
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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
170
01:16Torsion of Noncircular Members
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Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
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01:15Thin-Walled Hollow Shafts
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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...
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01:12Temperature Dependent Deformation
147
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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01:24Circular Shafts - Elastoplastic Materials
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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
As torque on the...
102