Mínguez-Tomás Nieves, Alonso-Pérez-Barquero Jorge, Fernández-Estevan Lucía, Vicente-Escuder Ángel, Selva-Otaolaurruchi Eduardo J
DDS, MSc, Department of Prosthodontics and Occlusion, Stomatology Department, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.
DDS, MSc, PhD Department of Prosthodontics and Occlusion, Stomatology Department, Faculty of Medicine and Dentistry, University of Valencia, Valencia, Spain.
J Clin Exp Dent. 2018 Jul 1;10(7):e681-e686. doi: 10.4317/jced.54834. eCollection 2018 Jul.
It is necessary to know the behavior of different attachment systems to be used clinically. The evolution of retention capacity over 10 years (14,600 insertion/de-insertion cycles) was determined , evaluating two overdenture attachment systems (Locator® and OT Equator®).
The study used an implant replica compatible with the abutments of both systems. 10 Locator® and 10 OT Equator® attachments were screwed to the abutments. Nylon inserts were attached and tested, subjecting them to 14,600 insertion and de-insertion cycles (representing 10 years functional life) in axial direction. The universal test machine crosshead speed was 50 mm/min with a de-insertion range of 2 mm.
The initial retention of Locator® was 17.02 N and of Equator® 16.36 N. After 14,600 cycles, Locator® suffered a mean loss of retention of 50.89%, while Equator® lost 69.28%. Both systems showed retention increases up to the first 1,000 cycles, which decreased thereafter up to 14.600 cycles. Statistically significant differences between the systems were found after 7,500 cycles.
Both systems presented acceptable retention capacities after 14,600 cycles. Significant differences in retention force between the systems evolved after 7,500 cycles (5 years use). These results should be treated with caution and should be verified clinically. Denture, mandibular prosthesis implantation, attachment, dental implant-abutment connection, denture retention.
了解不同附着系统的性能对于临床应用很有必要。本研究测定了两种覆盖义齿附着系统（Locator®和OT Equator®）在10年（14,600次插入/拔出循环）内固位力的变化情况。
本研究使用了一种与两种系统基台兼容的种植体模型。将10个Locator®和10个OT Equator®附着体拧到基台上。安装尼龙嵌体并进行测试，使其在轴向方向上经受14,600次插入和拔出循环（代表10年的功能寿命）。万能试验机的十字头速度为50 mm/min，拔出范围为2 mm。
Locator®的初始固位力为17.02 N，Equator®为16.36 N。在14,600次循环后，Locator®的平均固位力损失为50.89%，而Equator®损失了69.28%。两种系统在最初的1,000次循环中固位力均有所增加，此后直至14,600次循环则逐渐下降。在7,500次循环后，发现两种系统之间存在统计学上的显著差异。
在14,600次循环后，两种系统均表现出可接受的固位能力。在7,500次循环（使用5年）后，两种系统之间的固位力出现了显著差异。这些结果应谨慎对待，并需进行临床验证。义齿、下颌修复体植入、附着体、牙种植体-基台连接、义齿固位。
