Penetap tulang besi-keluli tahan karat terbiodegradasi menggunakan kaedah kimpalan geseran

Abstract

For the treatments of bone fracture, surgery will be conducted by installing the implant to maintain the proper position of fractured bone until the bone has completely joined. The implant removal surgery have been discussed till now due to the complication cases, the reaction of rejection from patient body and the risks of refracture. This research introduced a new system for bone-fracture screw application whereby it can minimise the procedure of bone fracture surgery and it enable to avoid the occurrence of bone refracture. The screw was made from two different materials which are SS316L (inert metal) and pure iron (biodegradable metal). In this system, the SS316L part will be removed while the pure iron will be remained in the bone. The combination of these two different metals was performed using friction welding technique. The welding joint of SS316L and pure Fe was successfully produced and then the screw product was also fabricated. The result from cell viability test of Normal Human Osteoblasts (NHOst) cells have shown that all the welded zones were biocompatible and have not induced any toxicity towards the cells. The concentration of the iron ion from the immersion corrosion test was 0.002375 mg/ml and this value is still below the safe concentration level of 0.050 mg/ml. The strength to pull out the screw from the cow bone tested ex vivo was 3879 ± 248 N while the pull-out failure only occurred on the cow bone (not on the screw). Further researches could be performed in future in order to know the effect of Fe ion distribution towards the organs of animal model through histology assessment.