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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >An evaluation of the influence of orthodontic adhesive on the stresses generated in a bonded bracket finite element model.
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An evaluation of the influence of orthodontic adhesive on the stresses generated in a bonded bracket finite element model.

机译：评估正畸粘合剂对粘结托架有限元模型中产生的应力的影响。

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The objective of this study was to evaluate the stresses generated in the bracket-cement-tooth continuum by a tensile load case when the physical and geometric properties of cement are varied. A 2-stage approach was used. In the first stage, a validated 3-dimensional finite element model of the bracket-cement-tooth system was constructed that consisted of 15,324 nodes and 2971 finite elements. Bracket base geometry was held constant; the physical properties (elastic modulus; Poisson's ratio) and geometry (lute thickness) of the cement varied. A simplified 2-dimensional model was then developed to investigate the localized effects of the cement lute thickness and the shape of the lute periphery on the stress distribution in the system. Small increases in stress were recorded under load within the cement as the rigidity of the cement increased. Similarly, Poisson's ratio values above 0.4 appeared to have a small influence on the major principal stresses in the impregnated wire mesh layer when a tensile force was applied. Variation in lute thickness was shown to have an influence on the distribution of major principal stresses within the cement lute. Increased stresses were recorded at the lute periphery as the lute dimensions increased. The morphologic features of the lute periphery also appeared to have had a significant effect on the performance of an orthodontic adhesive. Acute cement-enamel angles resulted in an increased chance of singularity development and attachment failure. The physical properties and thickness of the cement lute and the shape of the cement lute periphery contribute to the stress distribution within the bracket-cement-tooth continuum and, therefore, the quality of orthodontic attachment provided.
机译：这项研究的目的是评估当水泥的物理和几何特性发生变化时，在拉力荷载作用下，在支架-水泥-齿连续体中产生的应力。使用了两阶段方法。在第一阶段，构建了一个经过验证的3维三维有限元模型，该模型由15324个节点和2971个有限元组成。支架底座的几何形状保持恒定;水泥的物理性质（弹性模量;泊松比）和几何形状（粗粉厚度）各不相同。然后，开发了一个简化的二维模型来研究水泥琵琶厚度和琵琶边缘形状对系统应力分布的局部影响。随着水泥刚度的增加，在荷载作用下水泥中的应力略有增加。类似地，当施加张力时，高于0.4的泊松比值似乎对浸渍的丝网层中的主要主应力影响很小。结果表明，琵琶厚度的变化对水泥琵琶内主要主应力的分布有影响。随着琵琶尺寸的增加，在琵琶边缘记录到的应力增加。琵琶周围的形态特征似乎也对正畸粘合剂的性能具有显着影响。急性牙釉质角导致奇异性发展和附着失败的机会增加。水泥琵琶的物理性质和厚度以及水泥琵琶的外围形状有助于在支架-水泥-牙齿连续体内的应力分布，因此有助于提供正畸附着的质量。

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