DIMENSIONAL VERIFICATION AND QUALITY CONTROL OF IMPLANTS PRODUCED BY ADDITIVE MANUFACTURING
Abstract
Purpose: Development of computer technology and alternative manufacturing methods in form of additive manufacturing leads to the manufacture of products with complex shapes. In the field of medicine they include, inter alia, custom-made implants manufactured for a particular patient, such as cranial implants, maxillofacial implants, etc. With regard to the fact that such implants are inserted into a patient’s body, it is necessary to perform the verification, including the shape and dimensional verification. The article deals with the application of the industrial computer tomography within the process of inspection and verification of selected custom-made implant types.
Methodology/Approach: The Department of Biomedical Engineering and Measurement performs the verification of medicinal products manufactured by the additive manufacturing technologies from the Ti-6Al-4V (Grade 5) titanium alloy, using the coordinate measuring machine Carl Zeiss Contura G2 and the industrial computed tomography machine Carl Zeiss Metrotom 1500. These equipment fulfil the requirements for the identification and evaluation of dimensions of both, the external and the internal structures.
Findings: The article presents the possibilities of the computed tomography utilisation in the inspection of individual implant manufacture using the additive manufacturing technologies. The results indicate that with the adjustment of appropriate input parameters (alignment), this technology is appropriate for the analysis of shape deviations, when compared with the CAD model.
Research Limitation/implication: With the increasing distance of measured object from X-ray source, the machine’s resolution function decreases. Decreasing of resolution has a minor impact on the measured dimensions (relatively high tolerances), but has a significant impact on the evaluation of porosity and inclusions.
Originality/Value of paper: Currently, the verification of a manufactured implant can be carried out using 3D scanners and the industrial computed tomography. The use of 3D scanners is appropriate for the shape inspection, for example the shape of an implant’s outer surface. The computed tomography is the only method for evaluation of shape deviations, defectoscopy and dimensional analysis in one measurement.
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References
Bauza, M.B., Moylan, S.P., Panas, R.M., Burke, S.C., Martz, H.E., Taylor, J.S., Alexander, P., Knebel, R.H., Bhogaraju, R., O'Connell, M.T. and Smokovitz, J.D., 2014. Study of accuracy of parts produced using additive manufacturing. In: 2014 ASPE Spring Topical Meeting: Dimensional Accuracy and Surface Finish in Additive Manufacturing. Berkeley, CA, United States, April 13-16, 2014. Available at: http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915785 [Accessed 7 September 2014]
Brown Ch., Lubell, J. and Lipman, R.: Additive Manufacturing Technical Workshop Summary Report. Available at:
Drstvensek, I., Hren, N.I., Strojnik, T., Brajlih, T., Valentan, B., Pogacar, V. and Hartner, T.Z., 2008. Applications of Rapid Prototyping in Cranio-Maxilofacial Surgery Procedures. Internacional Journal of Biology and Biomedical Engineering, 2(1), pp.29-38. Available at: http://www.naun.org/main/NAUN/bio/bio-19.pdf [Accessed 10 September 2014].
Girardin, E., Renghini C., Dyson, J., Calbucci, V., Moroncini, F. and Albertini, G., 2011. Characterization of Porosity in a Laser Sintered MMCp Using X-Ray Synchrotron Phase Contrast Microtomography. Materials Sciences and Applications, 2(9), pp.1322-1330, doi:10.4236/msa.2011.29180.
http://nvlpubs.nist.gov/nistpubs/TechnicalNotes/NIST.TN.1823.pdf [Accessed 1 September 2014].
Léonard, F., Tammas-Williams, S., Prangnell, P., Todd, I. and Withers, P. 2012. Assessment by X-ray CT of the effects of geometry and build direction on defects in titanium ALM parts. In: Conference on Industrial Computed Tomography (ICT), 19-21 September 2012, Wels, Austria. Available at: http://www.ndt.net/article/ctc2012/papers/91.pdf [Accessed 5 September 2014].
Matilainen, V. 2012. Benchmarking of laser additive manufacturing process. Bachelor thesis. Lappeenranta University of Technology. Available at: http://www.doria.fi/bitstream/handle/10024/84863/BSc%20Thesis%20Matilainen%20fv.pdf?sequence=1 [Accessed 10 August 2014].
Podshivalov, L., Gomes, C.M., Zocca, A., Guenster, J., Bar-Yoseph, P. and Fischer, A., 2013. Design, Analysis and Additive Manufacturing of Porous Structures for Biocompatible Micro-Scale Scaffolds. Procedia CIRP, Volume 5, 2013, pp.247-252, ISSN 2212-8271. Available at: http://dx.doi.org/10.1016/j.procir.2013.01.049 [Accessed 10 September 2014].
Salmi M., 2013. Medical applications of additive manufacturing in surgery and dental care. Doctoral Disertation. Aalto University. Available at: https://aaltodoc.aalto.fi/bitstream/handle/123456789/11854/isbn9789526054964.pdf?sequence=1 [Accessed 5 September 2014].
Slotwinski, J.A., Garboczi, E.J., 2013. Porosity of Additive Manufacturing Parts for Process Monitoring. In: 40th Review of Progress in Quantitative Non-Destructive Evaluation, July 22-26, 2013, Baltimore, MD. Available at: http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914546 [Accessed 10 August 2014].
Živ?ák J., Hudák, R., Bednar?íková L., Tóth, T. and Trebuňová, M., 2013. Biomechanisms Individual Implants (In Slovak: Biomechanizmy Implantáty na mieru), Košice: Strojnícka fakulta TU, ISBN 978-80-553-1396-2.
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