Document Type: RESEARCH PAPER
Orthopedic Research Center, Mashhad University of Medical Science, Mashhad, Iran Esfarayen University of Technology, Esfarayen, North Khorasan, Iran
Biomaterials Group, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Tehran, Iran
Orthopedic Research Center, Mashhad University of Medical Science, Mashhad, Iran
Central Laboratory Faculty, Iran Polymers and Petrochemical Institute, Tehran, Iran
Background: Short-time creep behaviorfor aseries of biodegradable nanocomposites, which areused as implantable
devices inthe body, is a crucial factor.The present study aimed to investigate the effect of bioactive glass nanoparticles
(BGn) on creep and creep-recovery behaviors of polylactic acid/polycaprolactone (PLA/PCL) blends at different given
loads and different applied temperatures.
Methods: A series of biodegradable nanocomposites consisted of PLA/PCL blends (comprising 80 parts PLA and 20
parts PCL) with different amounts of modified-BGn (m-BGn) fillers were prepared using the evaporated solvent casting
technique. Creep and creep-recovery behaviors of all specimens were studied at different valuable stressesof 3 and 6
MPa and different given temperatures of 25 and 37°C.
Results: In all cases, m-BGn improved the creep resistance of the nanocomposites due to the retardation effect
during the creep behaviors of the nanocomposite systems. The obtained results in terms of creep and creep-recovery
properties determined that the nanocomposites of PLA/PCL/m-BGn can satisfy the required conditions of an appropriate
anterior cruciate ligament reconstruction (ACL-R) screw.
Conclusion: The obtained results confirmed that the BGn plays an impeding role in the movement of PLA/PCL chains
leading to in increase the creep resistance. According to the results, it was determined that the nanocomposites of PLA/
PCL and m-BGn can satisfy the required circumstances of a proper ACL-R screw.
Level of evidence: I