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Dokładność kształtu modelu szczęki dolnej wykonanego metodą technologii przyrostowej

Burek J., Turek P.

Mechanik

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2012

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R. 85, nr 5-6

510-513

PL

Przedstawiono sposób rekonstrukcji szczęki dolnej na podstawie danych z tomografu komputerowego. Opisano proces filtracji i triangulacji chmury punktów otrzymanej ze skanowania tego obiektu za pomocą skanera laserowego. Dokonano oceny dokładności wykonania szczęki dolnej metodą przyrostową FDM.

EN

A method of reconstruction of the jaw with reference to the data obtained by a computer tomography is explained. Described are the methods of filtration and triangulation of the cloud of points obtained by scanning of the object by means of a laser scanner. Finally, laser scanning was used to measure accuracy of the reconstructed replica of the jaw.

2

Model numeryczny szczęki do zabiegu podniesienia dna zatoki szczękowej

Polecki A., Grądzki R.

Aktualne Problemy Biomechaniki

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2009

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z. 3

187--192

PL

W pracy została przedstawiona procedura zabiegu podniesienia dna zatoki szczękowej. Zbudowano model numeryczny szczęki w systemie ANSYS na podstawie zdjęć CT oraz modelu fizycznego z podziałem kości na część korową i gąbczastą. Przedstawiono wstępne symulacje numeryczne dla zadanych obciążeń. Opracowany model numeryczny szczęki będzie przedmiotem dalszych analiz wytrzymałościowych, które dadzą odpowiedź na pytanie jak zabieg podniesienia dna zatoki szczękowej wpływa na rozkład naprężeń i odkształceń w tylnym obszarze szczęki.

EN

This work presents the procedure featuring elevation of the bottom of a maxillary sinus. A numeric model of a jaw was developed in the ANSYS system based on the CT photos and a physical model with division of the existing bone into core and spongy parts. Initial numeric simulations for the target load factors were also presented. The developed numeric model of a jaw will be subject to further resistance tests, which will provide the answer to the question on how the course of the procedure featuring elevation of the bottom of a maxillary sinus impacts the distribution of load and deformations in the back part of a jaw.

3

Evolutionary divergence in the feeding mechanism of fishes

Wilga C.

Acta Geologica Polonica

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2008

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Vol. 58, no. 2

113-120

EN

After the divergence of chondrichthyans and teleostomes, the structure of the feeding apparatus also diverged. Hyoid morphology varies considerably among fossil and extant elasmobranchs and has been hypothesized to be related to feeding style. How hyomandibular morphology affects function during feeding is of great interest since hyoid movement is a key component in the feeding mechanism. Cranial kinematics and buccal pressure during feeding was quantified in elasmobranchs and teleostomes. The feeding mechanism in elasmobranchs with anterior (AHY) or lateral (LHY) directed hyomandibulae differs from teleostomes primarily in hyoid movements due to morphological constraints. The hyoid expands ventrally during feeding in the species studied; however, the hyoid laterally compresses in AHY and LHY species but not in teleostomes or shark species with posterior directed hyomandibulae (PHY). Anterior and lateral hyomandibular orientation in elasmobranchs constrains them to adduct during feeding. This represents a fundamental difference in the feeding mechanism regardless of feeding style between elasmobranchs with AHY or LHY compared to sharks with PHY and teleostomes as a result of morphological divergence in hyoid morphology. It appears that posterior directed hyomandibulae may have evolved to increase the gape in specialized bite feeding sharks while lateral directed hyomandibulae evolved in specialized suction feeders.

4

Experimental evaluation of occlusal forces

Chladek W., Lipski T., Karasiński A.

Acta of Bioengineering and Biomechanics

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2001

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Vol. 3, nr 1

25-37

EN

The paper presents the results of measuring the occlusion forces in the group of 163 subjects being tested. In the research, the method based on the dependence of the plastic deformity and force intending the spherical penetrator upon each other in a metal sample was implemented. The results obtained allowed us to estimate the distribution of occlusion forces along the alveolar ridge and to define the dimensions of the maximum forces applied, while biting and gnawing. The biting force between the first incisors for different angles of parting mandible was also measured.

5

Experimental methods of stress and strain analysis in ortopaedics biomechanics

Będziński R., Tyndyk M.

Acta of Bioengineering and Biomechanics

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2000

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Vol. 2, nr 2

3-23

EN

Possibilities of applying several experimental methods to the analysis of displacements, strains and stresses in bone structures and implants are presented. Such methods as photoelasticity, holographic interfe-rometry, speckle photography and strain gauges are described. These techniques are significant in experimental investigations, especially during fast improvement of modem analytical and numerical methods. Experimental methods are indispensable for experimental verifications of boundary conditions in theoretical models. Experimental investigations of real objects and biomechanical models were carried out.