Effect of microstructure on friction wear of dental restorative alloys

在振动摩擦磨损中，微动和滑动同时存在，但传统的研究没有将两者区分开来。本研究采用振动摩擦磨损试验机检测了几种牙科合金的摩擦和磨损，该试验机测量了摩擦力和波形，以区分微动和滑动。为了在摩擦和磨损试验机中使用，平面和骑手由具有不同硬度的各种材料（合金和冷固树脂）构成。在控制载荷为20 N、振动频率为2 Hz的条件下，分别在空气和Ringer溶液中进行了不同振幅的微动和滑动试验。合金，Ag-Pd-Au合金（S-12），IV型金合金（PGA-2）和实验钛合金（TNTZ）被用于构建平板，并且所使用的骑具由冷固化树脂、不锈钢（SUS 304）和合金本身制成，其具有三种不同的硬度。这是摩擦和滑动的分界线在微动和滑动条件下，摩擦力随振动振幅的增加而增加。此外，由牙科合金上的冷固化树脂骑手引起的磨损轻微，但合金本身之间的微动磨损较重并产生裂纹。微动磨损比滑动磨损导致更显著的表面损伤，特别是对于TNTZ/SUS 304和TNTZ/TNTZ。

In oscillatory friction and wear, there exists both fretting and sliding ; however, traditional research conducted in the past have not distinguished between the two. This study examined the friction and wear of several dental alloys with an oscillatory friction and wear testing machine that gauges both frictional force and waveforms, in order to distinguish fretting from sliding. For use in the friction and wear testing machine, flats and riders were constructed from various materials (alloys and cold-sure resin) with varying degrees of hardness. The fretting and sliding tests were conducted with a controlling load of 20N, a vibrating frequency of 2Hz, in various oscillatory amplitudes and in air and Ringer's solution, respectively. The alloys, Ag-Pd-Au alloy (S-12), Type IV gold alloy (PGA-2) and experimental Ti alloy (TNTZ) were used for constructing the flats, and the riders used were made of cold cure resin, stainless steel (SUS304) and the alloys themselves, which came in three different degrees of hardness.As a result, a critical amplitude was found in each of the respective mates, which served as the boundary between fretting and sliding. Frictional force increased with an increase in vibrational amplitude for all friction mates in both fretting and sliding conditions. Also, wear caused by the cold cure resin rider on dental alloys was slight, but fretting wear between the alloys themselves was heavier and produced cracks. Fretting led to more significant surface damage than did sliding, especially for TNTZ/SUS304 and TNTZ/TNTZ.