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Abstract

In modern clinical practice in various areas of dentistry, there is a need to virtualize and determine the diagnostic parameters of the stomatognathic system (SS). The aim of this article is to provide an evaluation of correct SS structures based on a comparison of mappings in pantomography, lateral cephalometry, and volumetric tomography using bone and tooth anthropometric points. The digital measurements performed determine the applicability of the analyzed imaging techniques for clinical diagnostics by indicating discrepancies and errors in the evaluation of geometric parameters. They should verify the location of characteristic points, lines, angles, and planes in relation to spatial objects mapped on the 1:1 scale. The analyses performed confirm the appearance of bone and dental structure asymmetry in healthy patients.
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Authors and Affiliations

Wojciech Ryniewicz
1
Łukasz Bojko
2
Anna M. Ryniewicz
2

  1. Jagiellonian University Medical College, Faculty of Medicine, Dental Institute, Department of Dental Prosthodontics and Orthodontics, 4 Montelupich Street, 31-155 Krakow, Poland
  2. AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, 30 Mickiewicza Ave., 30-059 Krakow
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Abstract

This paper presents a preoperative hip reconstruction method with diagnosed osteoarthritis using Durom Hip Resurfacing System (DHRS). The method is based on selection and application of the resurfacing to the pelvis reconstructed on the basis of computed tomography. Quality and geometrical parameters of distinguished tissues have a fundamental significance for locating and positioning the acetabular and femoral components. The application precedes the measurements of anatomical structures on a complex numerical model. The developed procedure enables functional selection of endo-prosthesis and its positioning in such a way that it secures geometric parameters within the bone bed and the depth , inclination angles and ante-version of the acetabular component, the neck-shaft angle and ante-torsion angle of the neck of the femoral bone, and reconstruction of the biomechanical axis of the limb and the physiological point of rotation in the implanted joint. Proper biomechanics of the bone-joint complex of the lower limb is determined by correlation of anatomical-geometrical parameters of the acetabular component and parameters of the femoral bone.

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Authors and Affiliations

Anna M. Ryniewicz
Łukasz Bojko
Tomasz Madej
Andrzej Ryniewicz
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Abstract

At the current stage of diagnostics and therapy, it is necessary to perform a geometric evaluation of facial skull bone structures basing upon virtually reconstructed objects or replicated objects with reverse engineering. The objective hereof is an analysis of imaging precision for cranial bone structures basing upon spiral tomography and in relation to the reference model with the use of laser scanning. Evaluated was the precision of skull reconstruction in 3D printing, and it was compared with the real object, topography model and reference model. The performed investigations allowed identifying the CT imaging accuracy for cranial bone structures the development of and 3D models as well as replicating its shape in printed models. The execution of the project permits one to determine the uncertainty of components in the following procedures: CT imaging, development of numerical models and 3D printing of objects, which allows one to determine the complex uncertainty in medical applications.

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Bibliography

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Authors and Affiliations

Andrzej Ryniewicz
1 2
Wojciech Ryniewicz
3
Stanisław Wyrąbek
1
Łukasz Bojko
4

  1. Cracow University of Technology, Faculty of Mechanical Engineering, Poland.
  2. State University of Applied Science, Nowy Sącz, Poland.
  3. Jagiellonian University Medical College, Faculty of Medicine, Dental Institute, Department of Dental Prosthodontics, Cracow, Poland.
  4. AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, Department of Machine Design and Technology, Cracow, Poland.
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Abstract

The functionality of a prosthesis is determined by clinical procedures, the manufacturing technology applied, the material used and its strength parameters. The aim of the paper is to evaluate the static strength and fatigue strength of acrylic construction materials directly after the process of polymerisation and for aged materials. It has been confirmed that the deformation speed of the tested materials has an evident impact on their mechanical characteristics. With greater deformation speed, a consistent increase in the material elasticity was observed in static compression tests, which was accompanied by a reduction in engineering stresses at the final stage of deformation. The greatest fatigue strength was observed for Vertex. It was by about 33% greater than the strength of Villacryl – the material that has the lowest fatigue properties. The resistance of acrylic polymers to cyclic loading applied with the frequency of 1 Hz may become an indication for the selection of the material to be used in the clinical procedures in which a patient is provided with full dentures.

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Authors and Affiliations

Anna Maria Ryniewicz
Tomasz Machniewicz
Wojciech Ryniewicz
Łukasz Bojko

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