Abstract
BackgroundDemographic change is leading to an increase in the number of osteoporotic patients, so a rethink is required in implantology in order to be able to guarantee adequate anchoring stability in the bone. The functional modification of conventional standard screw implants using superelastic, structured Ti6Al4V anchoring elements promises great potential for increasing anchoring stability.MethodsFor this purpose, conventional screw implants were mechanically machined and extended so that structured-superelastic-positionable-Ti6Al4V anchoring elements could be used. The novel implants were investigated with three tests. The setup of the anchoring elements was investigated in CT studies in an artificial bone. In a subsequent simplified handling test, the handling of the functional samples was evaluated under surgical conditions. The anchorage stability compared to standard screw implants was investigated in a final pullout test according to ASTM F543—the international for the standard specification and test methods for metallic medical bone screws.ResultsThe functionalization of conventional screw implants with structured superelastic Ti6Al4V anchoring elements is technically realizable. It was demonstrated that the anchoring elements can be set up in the artificial bone without any problems. The anchorage mechanism is easy to handle under operating conditions. The first simplified handling test showed that at the current point of the investigations, the anchoring elements have no negative influence on the surgical procedure (especially under the focus of screw implantation). Compared to conventional standard screws, more mechanical work is required to remove the functional patterns completely from the bone.ConclusionIn summary, it was shown that conventional standard screw implants can be functionalized with Ti6Al4V-structured NiTi anchoring elements and the new type of screws are suitable for orthopedic and neurosurgical use. A first biomechanical test showed that the anchoring stability could be increased by the anchoring elements.
Highlights
ObjectivesThe aim of the present study was to functionalize standard screw implants in order to increase anchorage stability in bone and revision capability by using superelastic,
Demographic change is leading to an increase in the number of osteoporotic patients, so a rethink is required in implantology in order to be able to guarantee adequate anchoring stability in the bone
NiTi‐screw For the integration of NiTi anchoring elements, conventional standard monoaxial pedicle screws (45 × 6.5 mm) were drilled with a 40-mm-long hole (ø 3 mm) and two opposing identical pockets were eroded from the base body
Summary
The aim of the present study was to functionalize standard screw implants in order to increase anchorage stability in bone and revision capability by using superelastic,. The aim of the present study was to functionalize standard screw implants to increase anchorage stability in bone and revision capability by using superelastic, structured anchorage elements. The aim of the study was to investigate the increase of anchorage stability of screw implants by using superelastic anchorage elements with pyramid structure made of Ti6Al4V with regard to their manufacturing, handling and biomechanical pullout test
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