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Thirty titanium screw implants of five different diameters (3.3, 3.8, 4.3, 5.0, and 6.0 mm) with tube-in-tube implant-abutment connections (CAMLOG Biotechnologies, Wimsheim, Germany) were used as test specimens. Implants of each size were connected to abutments, and abutment screws were tightened to 20 N · cm using a digital torque meter (Hios HDM-5; Hios Inc, Chiba, Japan).

Methods : The fracture strength by a torsion test at the implant-abutment interface

author: Fumihiko Watanabe,Kazuhiko Hiroyasu, Kazuhiko Ueda | publisher: drg. Andreas Tjandra, Sp. Perio, FISID

Methods

Thirty titanium screw implants of five different diameters (3.3, 3.8, 4.3, 5.0, and 6.0 mm) with tube-in-tube implant-abutment connections (CAMLOG Biotechnologies, Wimsheim, Germany) were used as test specimens. Implants of each size were connected to abutments, and abutment screws were tightened to 20 N · cm using a digital torque meter (Hios HDM-5; Hios Inc, Chiba, Japan). A torsion testing device (AG-XR; Shimadzu, Kyoto, Japan) was used on all implant test specimens in this study (Fig. 1).

The specimens were mounted on the torsion testing device, and mechanical stress was applied with a rotational speed of 3.6 °/min until permanent deformation or fracture occurred. The maximum torque (fracture torque) and torsional yield strength were measured in each specimen. The mean values of measured data were calculated and compared using Tukey’s test at 0.05 level of significance.

The specimens were then removed from the device and the abutments unscrewed, and the parts of the interface between the rotation-prevention structure of the implants and abutments were examined using a scanning electron microscope (SEM).

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