Bambini F, Memè L, Pellecchia M, Sabatucci A, Selvaggio R
Odontostomatological Surgery Unit, Department of Odontostomastological Sciences, University of Ancona, Ancona, Italy.
Minerva Stomatol. 2005 Mar;54(3):129-38.
The implant/abutment interface represents a crucial element to maintain the structural stability of the implant restoration and to prevent mechanical problems that can compromise the long-term success of the implant treatment.
In this study deformation of the external hexagonal and internal octagonal extension of 2 implants after applying different values of insertion torque has been tested. The implants were secured in a customized resin baseplate, with the implant neck exposed, then different values of insertion torque were applied by an electronic torque controller.
Five internal octagonal implants were tested for 60 seconds to different torque magnitudes (12 Ncm, 21 Ncm, 27 Ncm, 36 Ncm, 42 Ncm). Two external hexagonal implants were tested for 60 seconds to a torque value of 27 Ncm and of 36 Ncm.
After torquing tests, each implant was examined by a scanning electron microscope (SEM) medium and high magnification to evaluate the deformation of the 2 different antirotational systems. The SEM analysis of the internal octagonal and external hexagonal antirotational systems of the TBR implant showed a deformation proportional to the magnitude of the applied torque during implant insertion. The geometric deformation of the antirotational extension is capable of compromising its function after a torque magnitude of 36 Ncm or superior to this value. Moreover it was demonstrated a more evident alteration of the external hexagonal extension in comparison with the octagonal system after applying a torque value of 27 Ncm.
种植体/基台界面是维持种植修复结构稳定性以及预防可能影响种植治疗长期成功的机械问题的关键要素。
在本研究中，对2颗种植体在施加不同植入扭矩值后其外部六边形和内部八边形延伸部分的变形情况进行了测试。将种植体固定在定制的树脂基板中，使种植体颈部暴露，然后通过电子扭矩控制器施加不同的植入扭矩值。
对5颗内部八边形种植体在不同扭矩大小（12 Ncm、21 Ncm、27 Ncm、36 Ncm、42 Ncm）下测试60秒。对2颗外部六边形种植体在扭矩值27 Ncm和36 Ncm下测试60秒。
在扭矩测试后，通过扫描电子显微镜（SEM）在中高放大倍数下检查每个种植体，以评估两种不同抗旋转系统的变形情况。对TBR种植体的内部八边形和外部六边形抗旋转系统的SEM分析表明，在种植体植入过程中，抗旋转系统的变形与所施加扭矩的大小成正比。当扭矩大小达到36 Ncm或高于此值时，抗旋转延伸部分的几何变形会损害其功能。此外，在施加27 Ncm扭矩值后，与八边形系统相比，外部六边形延伸部分的改变更为明显。
