一种治疗颞下颌关节的新型医疗装置的有限元模拟

K. Kwieciński, J. Żmudzki, G. Chladek, P. Popielski, M. Kowalczyk, E. Duraj, M. Sołtysiak-Niedziela
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引用次数: 0

摘要

颞下颌紊乱(TMD)是牙科的主要健康问题之一。采用有限元法研究了舌训练器柔性障碍物材料弹性特性对其挠度范围和强度的影响。在训练器舌的原型设计中,我们以具有不同程度舌障碍的真实模型为出发点。用牙蜡在牙石模型上铸成的。然后在口腔内测试不同版本对舌头所占空间的感知。在三维扫描仪上对模型进行扫描,然后在此基础上建立参数化CAD模型(NX Siemens)。最后,为了考虑到舌障的解剖学方面,我们将舌障的两个极端范围分别命名为“长”和“短”。采用有限元法在线性范围内(NX Siemens)进行了模拟挠度和材料强度试验。分别对杨氏模量为8 MPa、80 MPa和800 MPa的材料进行了计算。假设舌头与5N的力相互作用。支撑由牙齿上的固位面提供,障碍物后缘在上颚的支撑(腭型)或缺乏支撑,即障碍物在该区域自由弯曲(自由型),另外进行测试。为了评估训练器在牙齿上的掉落或保留,在舌侧牙齿和牙周区有刚性支撑的情况下,假设水平(前向)舌压力为10N,进行第二类模拟。在该变体中,采用弹性模量E=80 MPa的材料进行模拟。获得了训练器柔性障碍物的应力值,从而为训练器的构造选择了可能有价值的材料。模拟结果表明,使用醋酸乙烯酯(EVA)及其共混物是可行的。在密封的障碍物内发现了唾液的积累,这表明需要寻找一个区域来穿孔,而不会失去障碍物的负载能力。通过仿真验证了在不显著改变障碍物的承载能力和刚度的情况下解决唾液积聚问题的结构可行性。将模型简化为线性范围不能进行屈曲分析。此外,线性材料的假设进一步限制了分析具有软化和平台特性的材料的可能性,其中结构的顺应性导致弹性屈曲。确定了训练器弹性元件在不同刚度下的挠度和应力范围,以便为医疗器械(MD)选择合适的材料。聚氨酯或硅树脂提供挠度和强度范围,但在制造预制运动鞋的情况下,在患者口中热成型(最高温度75℃),可使用的材料是醋酸乙烯酯(EVA)。仿真试验可以确定训练器柔性障碍物在不同刚度下的挠度和应力范围,以便为医疗装置选择合适的材料。
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FEM simulation of a novel medical device for TMJ therapy
Temporomandibular disorders (TMD) are one of the leading health problems in dentistry. The work aimed to evaluate, using FEM, the influence of the material elastic properties of the flexible obstacle of the tongue trainer on the range of deflection and strength.In prototyping the trainer tongue, the starting point was real models with different extents of the tongue obstacle. moulded from dental wax on a dental stone model. Then versions were tested intraorally for the perception of the space occupied by the tongue. The models were scanned on a 3D scanner, and then a parametric CAD model (NX Siemens) was made on their basis. Finally, in order to take into account, the anatomical aspects, the two extreme ranges of the tongue obstacle, named "Long " and " Short ", were developed. Simulation deflection and material strength tests were made using FEM in the linear range (NX Siemens). Calculations were made for materials with Young's modulus equal to 8 MPa, 80 MPa and 800 MPa. The interaction of the tongue with the force of 5N was assumed. The support was provided by the retention surface on the teeth, with the support of the posterior edge of the obstacle on the palate (palatal variant) or lack of support, i.e., the obstacle freely bending in this area (free variant), was additionally tested. In order to assess the drop or retention of the trainer on the teeth, the second type of simulation was performed with the assumption of horizontal (anteriorly directed) tongue pressure with the force of 10N for the condition of rigid support in the area of the teeth and the periodontal zone from the lingual side. In this variant, a simulation was adopted for a material with a modulus of elasticity E=80 MPa.The stress values of the flexible obstacle of the trainer were obtained, allowing for the selection of potentially valuable materials for the trainer's construction. The results obtained in the simulations indicate the possibility of using ethylene vinyl acetate (EVA) and its blends. The accumulation of saliva inside the sealed obstacle was found, which indicated the need to look for an area to perforate without losing the load capacity of the obstacle. The structural feasibility of solving the problem of saliva accumulation without a significant change in the load capacity and stiffness of the obstacle was confirmed by simulation.Simplifying the model to a linear range does not allow buckling analysis. In addition, the assumption of a linear material further limits the possibility of analysing materials with softening and plateau characteristics, where the compliance of the structure leads to elastic buckling.The range of deflections and stresses for different stiffness of the elastic element of the trainer was determined in order to select the appropriate material for the medical device (MD). Polyurethanes or silicones provide the range of deflection and strength, but in the case of manufacturing prefabricated trainers thermoformed in the patient's mouth (maximum temperature 75C), the material that can be used is ethylene vinyl acetate (EVA).Simulation tests made it possible to determine the range of deflections and stress for different stiffness of the flexible obstacle of the trainer in order to select the appropriate material for the medical device.
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来源期刊
Archives of materials science and engineering
Archives of materials science and engineering Materials Science-Materials Science (all)
CiteScore
2.90
自引率
0.00%
发文量
15
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