Methods : The fracture strength by a torsion test at the implant-abutment interface
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).
Serial posts:
- The fracture strength by a torsion test at the implant-abutment interface
- Background : The fracture strength by a torsion test at the implant-abutment interface
- Methods : The fracture strength by a torsion test at the implant-abutment interface
- Discussion : The fracture strength by a torsion test at the implant-abutment interface (1)
- Discussion : The fracture strength by a torsion test at the implant-abutment interface (2)
- Figure 1. Torsion testing device
- Figure 3. The mean value of maximum fracture torque strength
- Figure 4. The mean value of torsional yield strength
- Figure 5. SEM picture of CAMLOG implant after torsion test
- Figure 6. SEM picture of implant with external hexagonal connection