Study of nanostructured NiTi shape memory alloy’s structure and functional properties

The present work is aimed to study of nanostructured NiTi shape memory alloy’s structure and functional properties depending on the type of thermo mechanical treatment. Structure, recoverable strain and reactive force were compared for coarse grain alloys and nanostructured alloy which was prepared by equal chanal angular pressing. The structure of the nanostructured NiTi was studied by means of TEM. Functional properties were studied by three point bending method in wide temperature range. The processing of the alloy by equal canal angular pressing at 450C results in formation of the structure with mean grain size about 300 nm. The functional properties of nanostructured and coarse grain alloys were compared in terms of maximal recoverable strain, maximal reactive force, specific energy capacity and functional inflexibility. It was found that nanostructured alloy generates essentially higher maximal recoverable force, has higher specific energy capacity and functional inflexibility than coarse grain one deformed as well (up to 7%). These advantages are most favourable in the field of applications of the shape memory alloys to surgical or dental implant’s design

Application of nanostructural nickel titanium implants with shape memory effect to modern dental practice

The results of clinical treatment of severe periodontal diseases by application of the new functional implants based on nanostructural NiTi alloy with shape memory effect are presented. The nanostructure in NiTi alloy is attained by severe plastic deformation, particularly by equal channel angular pressing. Several new types of NiTi implants are developed, including dental implants (to replace the removed teeth) and trans radix implants (to enforce teeth and to attach teeth to the jaw bone). The surface of nanostructured NiTi implants is covered by the carbyne layer in order to ensure high bio-compatibility. The new treatment procedure is proposed which includes the injection into the jawbone tissue of the mixture based on powdered NiTi alloy. These injection implants will be incorporated into living bone tissue. The result will be the growth of the shell of the new healthy dense bone. The NiTi particles behave structurally similar to healthy bones, i.e. living tissue cells incorporate with them followed by small vessels and nerves. As a result the implants will not be rejected for a long time. The summary results of 3 years’ practice of the successful application of these new implantation system in dentistry are presented. The ease of implementation of the new NiTi dental shape memory implants and the ease at which they can be adopted to bone tissue, especially in cases where it’s in deficit are highlighte