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首页> 外文期刊>The Journal of Prosthetic Dentistry >Screw joint stability after the application of retorque in implant-supported dentures under simulated masticatory conditions
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Screw joint stability after the application of retorque in implant-supported dentures under simulated masticatory conditions

机译：在模拟咀嚼条件下，在种植体支持的义齿上施加扭矩后，螺钉关节的稳定性

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Statement of problem Screws can loosen through mechanisms that have not been clearly established. Purpose The purpose of this study was to evaluate the influence of the tightening technique (the application of torque and retorque on the joint stability of titanium and gold prosthetic screws) in implant-supported dentures under different fit levels after 1 year of simulated masticatory function by means of mechanical cycling. Material and methods Ten mandibular implant-supported dentures were fabricated, and 20 cast models were prepared by using the dentures to create 2 fit levels: passive fit and created misfit. The tightening protocol was evaluated according to 4 distinct profiles: without retorque plus titanium screws, without retorque plus gold screws, retorque plus titanium screws, and retorque plus gold screws. In the retorque application, the screws were tightened to 10 Ncm and retightened to 10 Ncm after 10 minutes. The screw joint stability after 1 year of simulated clinical function was measured with a digital torque meter. Data were analyzed statistically by 2-way ANOVA and Tukey honestly significant difference (HSD) post hoc tests (α=.05). Results The factors of fit level and tightening technique as well as the interaction between the factors, were statistically significant. The misfit decreases the loosening torque. The retorque application increased joint stability independent of fit level or screw material, which suggests that this procedure should be performed routinely during the tightening of these devices. Conclusion All tightening techniques revealed reduced loosening torque values that were significantly lower in misfit dentures than in passive fit dentures. However, the retorque application significantly increased the loosening torque when titanium and gold screws were used. Therefore, this procedure should be performed routinely during screw tightening.
机译：问题陈述螺钉可能会通过尚未明确建立的机制松开。目的本研究的目的是通过模拟咀嚼功能1年后，评估不同配合水平下种植体支撑义齿的拧紧技术（扭矩和扭矩对钛和金修复螺钉的关节稳定性的影响）的影响。机械循环的手段。材料和方法制作了10个下颌植入物支持的假牙，并使用假牙创建了2个拟合级别，从而制备了20个模型：被动拟合和产生错配。根据4个不同的轮廓评估拧紧方案：无扭矩加钛螺丝，无扭矩加金螺丝，扭矩加钛螺丝和扭矩加金螺丝。在施加扭矩时，将螺钉拧紧至10 Ncm，然后在10分钟后重新拧紧至10 Ncm。用数字扭矩仪测量模拟临床功能1年后的螺钉接头稳定性。事后检验（2- = ANOVA）和Tukey诚实显着差异（HSD）对数据进行统计学分析（α= .05）。结果适合度和紧固技术的因素以及这些因素之间的相互作用具有统计学意义。失配会降低松动扭矩。扭矩施加增加了接头的稳定性，而与装配水平或螺钉材料无关，这表明应在拧紧这些装置时例行执行此程序。结论所有拧紧技术均显示出松动扭矩值降低，错配义齿的松动扭矩值明显低于被动义齿。但是，使用钛和金螺钉时，施加扭矩会显着增加松动扭矩。因此，在拧紧螺丝时应常规执行此步骤。

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