Statement of problem

Screw loosening is a common problem in implant dentistry; however, information is sparse on the influence of different fluids on the screw threads.

Purpose

The purpose of this in vitro study was to investigate the influence of 4 different fluids and agents (saliva, blood, chlorhexidine [CHX] gel, and special sealing silicone) on the preload force of abutment screws.

Materials and methods

The test specimens (N=50) consisted of a thread sleeve resembling the implant, an abutment analog, and an abutment screw. The tightening of the screw with a torque wrench was performed in 5 steps (15 Ncm, 20 Ncm, 25 Ncm, 30 Ncm, and 35 Ncm). Each agent was applied in the lumen of the thread sleeve of 10 specimens. Ten dry thread sleeves served as the control. Comparisons between 2 independent groups were performed with the t test or Wilcoxon–Mann–Whitney test, as appropriate. The Bonferroni correction was used for multiple comparisons (α=.05).

Results

Preload forces increased linearly with the applied tightening torque for dry implant lumina, as well as for saliva, blood, silicone, and CHX gel in the implant lumina or thread sleeves. In general, none of the tested agents resulted in significantly higher preload forces compared with the dry control.

Conclusions

The agents investigated did not have any lubricant action on implant abutment screws.

中文翻译：

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不同药剂对种植体基台螺钉预紧力的影响

问题陈述

螺丝松动是种植牙的常见问题；然而，关于不同流体对螺纹的影响的信息很少。

目的

这项体外研究的目的是研究 4 种不同的液体和试剂（唾液、血液、氯己定 [CHX] 凝胶和特殊密封硅胶）对基台螺钉预紧力的影响。

材料和方法

测试样本 (N=50) 由类似种植体的螺纹套管、基台类似物和基台螺钉组成。用扭矩扳手拧紧螺丝分 5 个步骤（15 N​​cm、20 Ncm、25 Ncm、30 Ncm 和 35 Ncm）。将每种药剂施加在 10 个试样的螺纹套管的管腔中。十个干线套筒用作对照。2 个独立组之间的比较使用t检验或 Wilcoxon-Mann-Whitney 检验（视情况而定）。Bonferroni 校正用于多重比较 (α=.05)。

结果

预紧力随着对干植入管腔以及植入管腔或螺纹套管中的唾液、血液、硅胶和 CHX 凝胶施加的拧紧扭矩而线性增加。一般而言，与干燥对照相比，没有一种测试试剂导致显着更高的预加载力。

结论

所研究的试剂对种植体基台螺钉没有任何润滑作用。