Effect of Heating Temperature on Wear Rate, Tensile Strength, and Crystallinity of Cantula Fiber-Reinforced Magnesium/Hydroxyapatite/ Shellac for Bone Screw Material

Abstract

Bone screws are screws for bone that are joined to support plates. Bone screws generally use metal as the primary material because of its high mechanical properties, such as stainless steel and titanium. Currently, many biomaterials for bone screws are being developed, which can be degraded by the body so that there is no need for surgical removal of bone plates and screws. This study aimed to determine the effect of heating temperature on tensile strength, wear rate, and crystallinity of the magnesium/nano HA/shellac/cantala fiber bio-composite. This study used magnesium, nano-hydroxyapatite, shellac, and cantala fiber materials mixed using a blender with a volume ratio of magnesium/nano-HA-shellac/cantala fiber of 50/20/30, then compacted with a pressure of 300 MPa for ten minutes. The heating process was carried out with variations in temperature of 100 °C, 120 °C, 140 °C and 160 °C for two hours. The results showed that the lowest wear rate was 0.72 x 10-3 mm3/Nm at a temperature variation of 160 °C. The highest tensile strength value was 6.58 MPa at 160 °C temperature variation. The highest degree of crystallinity, 74.15%, was obtained by observing X-ray diffraction (XRD) at a temperature variation of 160 °C.