Moraru Edgar, Stoica Alina-Maria, Donțu Octavian, Cănănău Sorin, Stoica Nicolae-Alexandru, Constantin Victor, Cioboată Daniela-Doina, Bădiță-Voicu Liliana-Laura
Faculty of Mechanical Engineering and Mechatronics, National University of Science and Technology Politehnica Bucharest, 313 Splaiul Independentei, 060042 Bucharest, Romania.
The National Institute of Research and Development in Mechatronics and Measurement Technique, 6-8 Soseaua Pantelimon, 021631 Bucharest, Romania.
Materials (Basel). 2023 Sep 9;16(18):6141. doi: 10.3390/ma16186141.
Due to the expansion of the use of powder bed fusion metal additive technologies in the medical field, especially for the realization of dental prostheses, in this paper, the authors propose a comparative experimental study of the mechanical characteristics and the state of their microscale surfaces. The comparison was made from material considerations starting from two dental alloys commonly used to realize dental prostheses: Ni-Cr and Co-Cr, but also technologies for obtaining selective laser melting (SLM) and conventional casting. In addition, to compare the performances with the classical casting technology, for the dental prostheses obtained through SLM, the post-processing stage in which they are in a preliminary finishing and polished state was considered. Therefore, for the determination of important mechanical characteristics and the comparative study of dental prostheses, the indentation test was used, after which the hardness, penetration depths (maximum, permanent, and contact depth), contact stiffness, and contact surface were established, and for the determination of the microtopography of the surfaces, atomic force microscopy (AFM) was used, obtaining the local areal roughness parameters at the miniaturized scale-surface average roughness, root-mean-square roughness (RMS), and peak-to-peak values. Following the research carried out, several interesting conclusions were drawn, and the superiority of the SLM technology over the classic casting method for the production of dental prostheses in terms of some mechanical properties was highlighted. At the same time, the degree of finishing of dental prostheses made by SLM has a significant impact on the mechanical characteristics and especially the local roughness parameters on a miniaturized scale, and if we consider the same degree of finishing, no major differences are observed in the roughness parameters of the surfaces of the prostheses produced by different technologies.
由于粉末床熔融金属增材制造技术在医学领域的应用不断扩展，特别是在牙科假体制造方面，本文作者提出了一项关于其力学特性及其微观表面状态的对比实验研究。该对比从材料角度出发，选取了两种常用于制造牙科假体的牙科合金：镍铬合金和钴铬合金，同时还涉及选择性激光熔化（SLM）技术和传统铸造技术。此外，为了与传统铸造技术的性能进行比较，对于通过SLM制造的牙科假体，考虑了其处于初步精加工和抛光状态的后处理阶段。因此，为了确定重要的力学特性并对牙科假体进行对比研究，采用了压痕试验，之后确定了硬度、穿透深度（最大深度、永久深度和接触深度）、接触刚度和接触面积，并且为了确定表面的微观形貌，使用了原子力显微镜（AFM），获得了微型尺度下的局部面积粗糙度参数——表面平均粗糙度、均方根粗糙度（RMS）和峰峰值。经过研究得出了一些有趣的结论，突出了SLM技术在生产牙科假体的某些力学性能方面优于传统铸造方法。同时，SLM制造的牙科假体的精加工程度对力学特性尤其是微型尺度下的局部粗糙度参数有显著影响，并且如果考虑相同的精加工程度，不同技术制造的假体表面粗糙度参数没有观察到重大差异。
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