Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt- Universität zu Berlin, Dental Materials and Biomaterial Research, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Str. 4-6, 14197, Berlin, Germany.
Gensow GmbH & Co. Zahntechnik KG, Franzenhauserweg 2, 89081, Ulm, Germany.
J Mech Behav Biomed Mater. 2022 Jun;130:105225. doi: 10.1016/j.jmbbm.2022.105225. Epub 2022 Apr 5.
Due to its favorable properties, the high-performance polymer polyetheretherketone (PEEK) is used as a metal-free alternative for the fabrication of denture frameworks. For dental applications, PEEK is available in different colors, such as red or white, by compounding with different fillers. In order to permanently bond such different dental PEEK types together in a denture framework, ultrasonic welding could be a viable process. Therefore, the aim of this study was to determine the optimum processing welding parameters for welding different dental PEEK grades in terms of maximum weld strength.
Rectangular plates from three PEEK compounds were prepared according to the dimensions of a removable partial denture (RPD) of PEEK. These were combined in a way that four groups resulted, whereas the combination of pure PEEK served as control. In each group, 5 samples were ultrasonically welded at one of four welding energies using a microprocessor-controlled ultrasonic welder, where the welder was activated only once. Afterwards, the samples were subjected to tensile tests to evaluate the shear bond strength (SBS) of the joint.
Increasing the welding energy resulted in an increase in the welding time. Accordingly, the increase in the welding energy increased the surface deformation for all tested samples. The shear bond strengths ranged from 4.8 ± 0.68 MPa for samples welded with 50 Ws to 16.37 ± 1.69 MPa for samples welded with 90 Ws. Excessive weld energy of 130 Ws led to a significant decrease of SBS due to a severe indentation and perforation induced by the sonotrode.
The SBS and topography of the welded samples were systematically studied and the optimal welding parameters were determined. This could serve as a reference and instruction for clinical applications.
由于其优异的性能，高性能聚合物聚醚醚酮（PEEK）被用作制造义齿支架的无金属替代品。对于牙科应用，PEEK 通过与不同的填料复合，可以制成不同的颜色，如红色或白色。为了在义齿支架中将不同类型的牙科 PEEK 永久地结合在一起，超声焊接可能是一种可行的工艺。因此，本研究的目的是确定在最大焊接强度方面焊接不同牙科 PEEK 等级的最佳工艺焊接参数。
根据 PEEK 可摘局部义齿（RPD）的尺寸，制备了三种 PEEK 化合物的矩形板。这些板以一种方式组合，共产生四个组，其中纯 PEEK 的组合作为对照。在每组中，使用微处理器控制的超声焊机在四个焊接能量中的一个能量下对 5 个样品进行超声焊接，其中焊机仅激活一次。然后，对样品进行拉伸试验，以评估接头的剪切结合强度（SBS）。
增加焊接能量会导致焊接时间的增加。因此，增加焊接能量会增加所有测试样品的表面变形。SBS 的范围为 50Ws 焊接样品的 4.8±0.68MPa 到 90Ws 焊接样品的 16.37±1.69MPa。由于超声变幅杆引起的严重压痕和穿孔，过高的 130Ws 焊接能量导致 SBS 显著降低。
系统地研究了焊接样品的 SBS 和形貌，并确定了最佳的焊接参数。这可以作为临床应用的参考和指导。
