Wyniki wyszukiwania - BazTech

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Chewing efficiency and occlusal forces in PMMA, acetal and polyamide removable partial denture wearers

Macura-Karbownik A., Chladek G., Żmudzki J., Kasperski J.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 1

137--144

EN

Purpose: Thermoplastic materials, such as acetal (AC) and polyamide (PA), constitute an alternative to polymethyl methacrylate (PMMA) based resins as the materials for removable partial dentures. However, none of the previous studies compared chewing efficiency and occlusal forces in the wearers of dentures made of various materials. Therefore, the aim of this study was to determine and compare the chewing efficiency and occlusal forces in PMMA, PA and AC RPDs’ wearers. The hypothesis was that the type of denture base material shows a significant effect on chewing efficiency (expressed as a degree of food fragmentation) and occlusal force. Methods: The experiment included the group of 30 patients using removable partial dentures. The dentures made of PMMA, acetal and polyamide were tested in each patient. Each denture was worn for 90 days, with a random sequence of the denture manufacturing and insertion. After 7, 30 and 90 days of each denture wear, chewing efficiency coefficient was determined with the aid of a sieving method, and occlusal force was measured with a dynamometer. Results: The use of dentures made of PMMA or acetal was reflected by a marked increase in chewing efficiency and occlusal force. None of these parameters changed significantly with the time of denture wear. Moreover, no significant correlation was found between chewing efficiency and occlusal forces. Conclusions: Denture base material exerts significant effects on the degree of food fragmentation and the level of occlusal forces. The use of dentures and clasps made of materials with lower modulus of elasticity is associated with lower chewing efficiency and lower occlusal forces.

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Analiza możliwości zastosowania technologii przyrostowych do wytwarzania elementów konstrukcji robotów mobilnych

Cader M., Trojnacki M.

Pomiary Automatyka Robotyka

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2013

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R. 17, nr 2

200-207

PL

W artykule przedstawiono wyniki badań materiałów niemetalowych przeznaczonych do zastosowania w technologii przyrostowego wytwarzania elementów konstrukcji robotów. Artykuł dotyczy również zastosowania jednej z takich technologii, tj. technologii FDM do w produkcji części robotów, na przykładzie prototypu robota o zmiennej konfiguracji. W artykule opisano metodologię przygotowania wybranych części robota do wytworzenia z zastosowaniem technologii FDM.

EN

The article presents the research results of the mechanical properties of non-metallic materials used in additive manufacturing for the production of structural components of mobile robots. Article also concerns one of the technology, i.e., FDM for the production of reconfigurable robots construction elements. This paper also describes the methodology for the preparation of selected parts of the robot to manufacture them using FDM technology.

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Wytwarzanie wysokowytrzymałych części dla robotów mobilnych z zastosowaniem technologii FDM

Cader M., Trojnacki M., Budzik G.

Mechanik

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2013

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R. 86, nr 7CD

95--104

PL

Artykuł dotyczy zastosowania technologii FDM w szybkim prototypowaniu wysokowytrzymałych części robotów mobilnych. W artykule opisano metodologię przygotowania części do wytworzenia z zastosowaniem technologii FDM oraz przedstawiono wyniki badań materiałowych. Przedstawiono także wybrane wytyczne dla konstruktorów, projektujących części z przeznaczeniem do wytworzenia z zastosowaniem technologii FDM.

EN

Article presents the use of technology in FDM rapid prototyping of high-strenght parts of mobile robots. This paper describes the methodology for the preparation of parts for production them using FDM technology, and presents the results of research of materials. Also presented are selected guidelines for designers, designing parts for use in the manufacture using FDM technology.