[Tensile strength studies of self-cutting titanium osteosynthesis screws].

The tapping screws of the Medicon Osteosynthese System applied in the jaw and facial area were checked for their mechanical sturdiness. Screwing tests with bones and aluminium were carried out. The minimum fracture moment, the moment transferrable by the screw slot and the required moment for a tight seat of the Osteosynthese plate on the bone surface were calculated. The screws and plates are of titanium alloy TiA16V4 (US standard) for implantats. In a sample taken at random of test screws the fracture moments were measured and examined. All the screws support considerable loads and the fracture moments are almost 20% higher that the minimum fracture moment for TiA16V4 screws specified in DIN 267, part 18.