Objectives

The aim of the present laboratory study was to investigate the retentive properties and the wear of three different resin matrix attachments for implant overdentures as well as to assess the effects of implant angulation.

Methods and materials

Three attachment systems with either polyetheretherketone inserts (PEEK; Novaloc, Straumann, Basel, Switzerland), polyetherketoneketone inserts (PEKK; CM Loc, Cendres + Métaux, Biel, Switzerland) or nylon inserts (Locator R-Tx, Zest Dental Solutions, Escondido, California, USA) were evaluated. The patrices were connected to their implant analogues and fixed in a resin cast at implant angulations of 0° and 15°. The corresponding matrices with inserts were fixed in a stylized unilaterally removable dental prothesis. To simulate masticatory forces 30,000 insertion and removal cycles with an eccentric load of 100 N at a distance of 12 mm were performed in a chewing simulator. The retention forces were measured. The wear patterns were examined using a scanning electron microscope (SEM). The statistical analysis was performed using a one-way ANOVA followed by a Games-Howell test and a Friedman test.

Results

All attachment systems revealed a significant decrease in retention after testing, except PEEK 0°/0° and PEEK 15°/15°. PEEK and PEKK attachment systems showed significantly higher retentive forces than the nylon attachment system between 5000 and 30,000 cycles. The implant angulation did not significantly influence the retention behavior for any of the three attachment systems. Patrices showed no signs of wear, whereas the matrix inserts displayed signs of deformation.

Conclusion

Within the limitations of the present study, attachments with PEEK and PEKK inserts combined with titanium patrices are favorable for long-term use, both for orthogonal and tilted implants. All three attachment systems showed a high variability of the retentive forces at baseline and for subsequent cycles. This should be taken into consideration for clinical use.

中文翻译：

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用于植入义齿的树脂基体附件的固定和磨损。

目标

本实验室研究的目的是研究三种不同树脂基体附着物的固位性能和磨损，以及评估植入物成角的影响。

方法和材料

三种附接系统，分别带有聚醚醚酮插件（PEEK； Novaloc，Straumann，瑞士巴塞尔），聚醚酮酮插件（PEKK； CM Loc，Cendres +Métaux，Biel，瑞士）或尼龙插件（Locator R-Tx，Zest Dental Solutions，Escondido，美国加利福尼亚）进行了评估。将产品与植入物类似物连接，并固定在树脂铸模中，植入角为0°和15°。带有插入物的相应矩阵被固定在程式化的单侧可移动牙齿修复体中。为了模拟咀嚼力，在咀嚼模拟器中以100 N的偏心载荷在12 mm的距离下进行了30,000次插入和移除循环。测量了保持力。使用扫描电子显微镜（SEM）检查磨损模式。

结果

除PEEK 0°/ 0°和PEEK 15°/ 15°外，所有附着系统在测试后的保持力均显着降低。在5000至30,000次循环中，PEEK和PEKK固定系统的保持力明显高于尼龙固定系统。植入物的角度并没有显着影响这三个附着系统中任何一个的保持性能。饼未显示出磨损迹象，而基质插入物显示出变形迹象。

结论

在本研究的限制范围内，PEEK和PEKK刀片与钛架结合的附件对于正交和倾斜植入物均适合长期使用。所有三个附着系统在基线和随后的循环中都表现出较高的保持力变化性。对于临床使用应考虑到这一点。