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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.
Highlights
Product quality is one of the factors that best present a particular manufacturer; the product quality control in all manufacture stages belongs to the most important processes.Measuring devices used in the quality control process serve two fundamental purposes in the manufacture process
The second process is the inspection of products from the already implemented manufacture, in which products are inspected for meeting the requirements specified for example by the respective drawing documentation, with the concurrent inspection whether the manufacture process is maintained within the required limits
The article presents the possibilities of the computed tomography utilisation in the inspection of individual implant manufacture using the additive manufacturing technologies
Summary
Product quality is one of the factors that best present a particular manufacturer; the product quality control in all manufacture stages belongs to the most important processes. Unlike implants manufactured with the additive manufacturing, CNC-type equipment, casting or injection might possess, in addition to dimensional deviations, faults of internal structures Inspection of these faults is significantly more demanding than inspection of dimensions. We are currently witnessing a remarkable development of equipment using the concept of medical tomography, adjusted and applied to industrial conditions These tomography equipment are suitable for metrological purposes, facilitating the inspection of external product dimensions and the product volume. For implants verification we use 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. The computed tomography is a tool facilitating the detection of potential pores and inclusions inside an implant
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