Memarian Maryam, Zarrati Simindokht, Karimi Sedigheh, Bahrami Mehran
Associate Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Assistant Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
J Dent (Tehran). 2018 Mar;15(2):106-115.
The retentive properties of implant-retained overdentures (IRO) may be influenced by the type of attachments. The aim of this research was to compare the retention of two dental implant systems with compatible ball attachments, namely Straumann® system (SS) and Rhein83 SRL system (RS) after fatigue testing.
Two laboratory models consisting of two parallel Straumann® fixtures at a distance of 22 mm were prepared. Five pairs of each systems' ball attachments were examined (n=5). The samples were soaked in artificial saliva. The retention strength values (RSV) were recorded before the fatigue test and after 1100, 2200, 3300, 4400, and 5500 insertion and removal cycles at a speed of 51 mm/minute with a 50-N load cell in a universal testing machine. The data were analyzed by repeated measures analysis of variance (ANOVA) followed by independent sample t-test with Bonferroni corrections.
There was a decrease in the RSV in both systems after 5500 cycles of insertion and removal. There was a significant statistical difference between the RSV of the normal Sphero Block of the RS (17.52±0.68 N) and that of the Spare Lamella retention inserts of the SS (19.72±0.74 N, P=0.001).
Although the RSVs of the RS and SS were almost similar before the fatigue test, as the number of insertion and removal cycles increased, the RSV decreased more significantly in the RS compared to the SS.
种植体支持的覆盖义齿（IRO）的固位特性可能受附着体类型的影响。本研究的目的是比较两种带有兼容球帽附着体的牙种植系统，即士卓曼（Straumann®）系统（SS）和莱茵83 SRL系统（RS）在疲劳测试后的固位情况。
制备两个实验室模型，每个模型包含两个相距22 mm的平行士卓曼种植体。对每个系统的五对球帽附着体进行检测（n = 5）。将样本浸泡在人工唾液中。在万能试验机中，使用50 N的测力传感器，以51 mm/分钟的速度进行插入和取出循环，在疲劳测试前以及1100、2200、3300、4400和5500次循环后记录固位强度值（RSV）。数据采用重复测量方差分析（ANOVA），随后进行经Bonferroni校正的独立样本t检验。
在5500次插入和取出循环后，两个系统的RSV均下降。RS正常球形基台的RSV（17.52±0.68 N）与SS备用薄片固位嵌体的RSV（19.72±0.74 N，P = 0.001）之间存在显著统计学差异。
尽管在疲劳测试前RS和SS的RSV几乎相似，但随着插入和取出循环次数的增加，RS的RSV相比SS下降得更显著。
