Optical coherence tomography as a method for investigating porous materials made of titanium nickelide
Tatiana B. Lepekhina1, Viktor V. Nikolaev1 , Georgii V. Malkin1; 1Tomsk State University, Tomsk, Russia
Abstract
Titanium nickelide (TiNi) is considered one of the best biomaterials. Its chemical inertness, shape memory effect and ability to adapt to the anatomical features of a patient make it an ideal material for implantation. These implants possess physical and mechanical properties that closely resemble those of human bone tissue. Therefore, implants made from this material meet the medical requirements in surgery, dentistry and traumatology, and are also biocompatible with body tissues. Important parameters of porous TiNi implants include the average pore size and the pore size distribution, as these are the main structural characteristics of porous TiNi. Various destructive and non-destructive methods are used to study porosity. Among the non-destructive methods are optical microscopy and scanning electron microscopy, the use of which can be limited due to limited depth of focus and difficulties in focusing on three-dimensional porous structures. Optical coherence tomography (OCT) is a fast and non-invasive method that can be used to assess porosity. Thanks to rapid measurements, minimal sample preparation, and the ability to obtain three-dimensional images, OCT serves as an alternative method for porosity evaluation. In this study, OCT was used to investigate porous TiNi samples. The samples were fabricated using two methods: self-propagating high-temperature synthesis (SHS) and selective laser melting (SLM). Using the OCT method, the surface of the porous samples was analyzed, and both the pore size distribution and the average pore size were obtained. OCT made it possible to determine that the samples sintered by the SHS method have smaller pore sizes compared to those produced by the SLM method.
This research was funded by the Ministry of Science and Higher Education of the Russian Federation grant number 075-15-2024-557 dated 04/25/2024.
Speaker
Lepekhina Tatiana Borisovna
Tomsk State University, Tomsk, Russia
Russia
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