This in vitro study investigated the retention of the four different color-coded ERA attachments prior to and after various levels of fatigue loading (at baseline, at 500 cycles, and after every 500 cycles up to 5,500 cycles). Samples were placed in the Instron testing machine for determination of initial retentive values and then cycled in a specially designed fatigue machine and retested. The results of this study demonstrated that although there are four different retentive elements supplied by the manufacturer of the ERA system, there were only two significantly different groups; (1) the white attachments and (2) the orange, blue, and gray attachments (P < .05). After 500 cycles, there was a loss in retention of 60% for the white, 60% for the orange, 56% for the blue, and 54% for the gray. After 1,500 cycles there was no difference in retentive values for any of the four colored attachments (P < .05). Microscopic examination of worn specimens supported the findings of the fatigue testing.

译文

:这项体外研究调查了在不同水平的疲劳负荷之前和之后(在基线,500次循环以及每500次循环后最多5500次循环),四种不同颜色编码的ERA附件的保留情况。将样品放入Instron测试机中以确定初始保持值,然后在专门设计的疲劳机中循环并重新测试。这项研究的结果表明,尽管ERA系统的制造商提供了四种不同的保持元件,但只有两个显着不同的组; (1)白色附件,以及(2)橙色,蓝色和灰色附件(P <.05)。 500次循环后,白色的保留率降低了60%,橙色的保留率降低了60%,蓝色的保留率降低了56%,灰色的保留率降低了54%。在1,500个循环之后,四个彩色附件中的任何一个的保持力值均无差异(P <.05)。磨损样品的显微镜检查支持了疲劳测试的结果。

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