Faculdade São Leopoldo Mandic, Programa de Pós-Graduação, Campinas, Brasil.
Acta Odontol Latinoam. 2023 Aug 31;36(2):71-77. doi: 10.54589/aol.36/2/71.
Based on its mechanical properties, PEEK (polyether-ether-ketone) might be useful in restorative procedures. In oral rehabilitation, its viability has been studied mainly for prostheses and dental implants.
The aim of this study was to evaluate the fit accuracy of dental implant bars made of either PEEK or cobalt-chrome submitted to cycling mechanics.
This was an experimental in vitro study, where units were treated with two implants and mini-abutments, joined by cobalt-chrome or polyether-ether-ketone PEEK bars. A total 20 bars were prepared (n=10 per group) and subjected to mechanical cycling tests (1 million cycles on the distal cantilever of the bar in the vertical direction, 120N and sinusoidal loading, at a frequency of 2Hz). The fit at the abutment/implant interface was measured before and after cycling, and the counter-torque of the vertical screw of the mini abutments was measured after cycling, using a digital torquemeter. Data were analyzed by three-way ANOVA and Tukey's test at 5% significance level.
No statistically significant interaction was found among the three factors considered (bar material, implant positioning and mechanical cycling) (p = 0.592). No significant difference was identified in the interaction between bar material and implant positioning (p = 0.321), or between implant positioning and mechanical cycling (p = 0.503). The association between bar material and mechanical cycling was statistically significant (p = 0.007), with the cobalt-chrome bar resulting in greater misfit with mechanical cycling. There was no difference in counter-torque values between groups.
The PEEK bar provided better fit of the mini abutments to the implants, even after mechanical cycling. The counter-torque of the screws was similar in all scenarios considered.
基于其机械性能，PEEK（聚醚醚酮）在修复程序中可能有用。在口腔修复中，其在义齿和牙种植体方面的应用已经得到了广泛研究。
本研究旨在评估由 PEEK 或钴铬制成的牙种植体支杆在循环力学作用下的拟合精度。
这是一项体外实验研究，其中每个单元均采用两个种植体和微型基台，通过钴铬或聚醚醚酮 PEEK 杆连接。共制备了 20 个杆（每组 10 个），并进行了机械循环测试（在垂直方向上对杆的远端悬臂进行 100 万次循环，120N 正弦加载，频率为 2Hz）。在循环前后测量基台/种植体界面的拟合度，并使用数字扭力计测量循环后微型基台垂直螺丝的反扭矩。使用三因素方差分析和 Tukey 检验在 5%的显著水平下分析数据。
在所考虑的三个因素（杆材料、种植体定位和机械循环）之间未发现统计学上显著的相互作用（p = 0.592）。在杆材料和种植体定位之间的相互作用（p = 0.321）或在种植体定位和机械循环之间的相互作用（p = 0.503）中未发现显著差异。杆材料和机械循环之间的关联具有统计学意义（p = 0.007），钴铬杆在机械循环后导致更大的不匹配。各组之间的反扭矩值无差异。
即使在机械循环后，PEEK 杆也能更好地贴合微型基台和种植体。在所有考虑的情况下，螺丝的反扭矩相似。
