Wyniki wyszukiwania - BazTech

1

Microstructural and Micromechanical Tests of Titanium Crowns

Ryniewicz Wojciech, Bojko Łukasz, Pałka Paweł, Osada Piotr, Ryniewicz Andrzej

Tribologia

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2022

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nr 4

61--72

EN

Fixed prosthetic restorations must meet the health requirements in terms of the protection of the tissues of the oral cavity, biomechanical requirements for optimal tissue stress and the strength and wear resistance of the structure, aesthetic requirements related to the location of the gingival margin, as well as the shape, thickness, and colour of the veneers. The aim is to evaluate the impact of manufacturing technology on the microstructure and micromechanical parameters of titanium crowns. The material of the analysis are prosthetic crowns made of Ti6Al4V alloy for the maxilla premolars and the mandible molars, produced using two technologies: Selective Laser Melting (SLM) and CAD/CAM milling. Crown structures were evaluated on the basis of examinations of the microstructure and surface layer of the chamfers, micromechanical parameters in axial sections perpendicular to the dental arches, and the accuracy of mapping the internal shape in sections with horizontal planes perpendicular to the axis of the abutment tooth. The results of this work can be used in a clinical setting. They allow the evaluation of what is the impact of the technology of producing the supporting substructure on the structure of the prosthetic crown. The strength requirements in both technologies are met, while the higher value of the microhardness of the titanium SLM substructure, compared to the milled one, increases the stiffness of the structure under conditions of biomechanical excitation. The errors in mapping the internal shape of the crowns are comparable and slightly higher during sintering.

PL

Stałe uzupełnienia protetyczne powinny spełniać wymagania zdrowotne w aspekcie zabezpieczenia tkanek jamy ustnej, wymagania biomechaniczne dotyczące optymalnego wytężenia tkanek oraz wytrzymałości i odporności na zużycie konstrukcji, wymagania estetyczne związane z usytuowaniem obrzeża dodziąsłowego, a także kształtem, grubością i kolorem licowania. Celem jest ocena wpływu technologii wytwarzania na mikrostrukturę i parametry mikromechaniczne koron tytanowych. Materiałem analizy są korony protetyczne ze stopu Ti6Al4V na zęby przedtrzonowe szczęki i trzonowe żuchwy wytwarzane dwoma technologiami: Selective Laser Melting (SLM) i frezowania CAD/CAM. Konstrukcje koron oceniano na podstawie badań mikrostruktury i warstwy wierzchniej stopni, parametrów mikromechanicznych w osiowych przekrojach prostopadłych do łuków zębowych oraz dokładności odwzorowania kształtu wewnętrznego w przekrojach płaszczyznami horyzontalnymi, prostopadłymi do osi zęba filarowego. Wyniki tej pracy mogą być wykorzystane w warunkach klinicznych. Pozwalają ocenić, jaki jest wpływ technologii wytworzenia podbudowy nośnej, na konstrukcję korony protetycznej. Wymagania wytrzymałościowe w obu technologiach są spełnione, przy czym wyższa wartość mikrotwardości podbudowy tytanowej z SLM, w porównaniu do frezowanej, wpływa na zwiększenie sztywności konstrukcji w warunkach wymuszeń biomechanicznych. Błędy odwzorowania kształtu wewnętrznego koron są porównywalne i nieco wyższe przy spiekaniu.

2

Assessment of gold with titanium alloy weldability in conditions of a dental technique laboratory

Jania G., Żmudzki J., Topolska S.

Archives of Materials Science and Engineering

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2022

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Vol. 118, nr 1

36--41

EN

Purpose: In dental practice, there is necessary to weld gold with titanium under the conditions of a dental technique laboratory, which is difficult. The aim was to assess the weldability of pure gold with the titanium alloy Ti6Al4V using a prosthetic laser welding machine. Design/methodology/approach: Gold wire in a diameter of 0.4 mm made with the use of a jewellery drawbar (GOLDPORT, Szczecin, Poland) was welded to a titanium alloy Ti6Al4V substrate of dental implant abutment screw (MegaGen). Dental laser welding parameters (Bego Laser Star T plus) were 230 V; 6.5 ms; 2.5 Hz; laser spot 0.3 mm, and argon blow. Samples were included in resin, ground (500-4000 SiC), polished (Al2O3 suspension) and etched (Kroll solution) per 20 s before observation under a light microscope. Findings: There were well-welded and poorly joined zones. The discontinuities and voids there were not visible or sparse next to the initial weld point. Dendritic structure at well-welded remelting zones and two-phase microstructure of titanium and Ti3Au phase were found. The heat-affected zone was about of 20 microns. Research limitations/implications: Light microscopy was used, and precise phase identification required further investigations. Weld strength assessment requires further micro-hardness and load-bearing ability tests. Weldability concerns the model system with pure gold. Practical implications: In the case of elements with dimensions below 0.4 mm, the use of a laser with a smaller spot should be considered for better control of the remelting zone and mechanical positioning of the elements in order to stabilize and avoid discontinuities and voids. Originality/value: Prosthetic laser welding with a laser spot about of 0.3 mm allows to obtain well-welded parts of 0.3 mm in diameter under stable stitching conditions and higher than 0.4 mm in dimensions.

3

Comparative study on the accuracy of Biosculptor’s Bioscanner system in transtibial residual limb circumference measurement

Hamzah Nur Afiqah, Abd Razak Nasrul Arual, Ab Karim Mohd Sayuti, Salleh Siti Zuliana

Acta of Bioengineering and Biomechanics

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2021

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Vol. 23, no. 4

173--182

EN

Purpose: This study aimed to examine the accuracy and validity of the Biosculptor’s Bioscanner shape capturing system as a portable measuring device by analysing the changes in transtibial residual limb circumference parameters while walking. Assessment on an amputee could also allow for the clinical usability of the digital scanner to be studied. Methods: To verify the accuracy of the system, the Bioscanner method was compared to the widely used standard anthropometric manual measurement technique (i.e., tape measure). One transtibial prosthetic user was recruited to conduct a walking activity at a normal walking pace for 5 to 15 minutes. Circumferential profiles of the participant were obtained digitally and manually during 2–5 minutes of resting walking intervals. The mean differences between the two methods were compared and percentage differences were calculated. The means were used to calculate the standard error measurement (SEM) and the 95% confidence intervals. Study of the limit of agreement between the two method was also used to validate the accuracy of Bioscanner. Results: The findings showed that both measurements gave a general comparable linear pattern. The averaged results from both methods resulted in only small distinctive differences especially at circumference near the mid-patella tendon. Similarly, the pressure-sensitive areas of the limb resulted in only an average of 2.28% differences between the two measurement techniques. The system showed high reliability and SEM with <1 of 95% CI values and repeatability study gave ICC >0.9. Conclusions: Bioscanner appeared to be comparable with the standard manual method. The Biosculptor system provides the portability, fast, reliable, and high accuracy measurements of the transtibial residual limb circumference, thus, it can be considered as a valuable tool for daily measurement of amputee’s residual limb and pre-prosthetic training.

4

Kinetyczne badania sorpcji wody w chemicznie i termicznie utwardzanych tworzywach akrylanowych do protez zębowych

Kochanowski Michał, Karońska Karolina, Pryliński Mariusz

Przemysł Chemiczny

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2019

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T. 98, nr 6

986--988

PL

Przedstawiono wyniki badania sorpcji wody przez utwardzane termicznie i chemicznie tworzywa akrylanowe stosowane w protetyce do wykonywania płyt protez ruchomych, napraw oraz podścieleń. Najwyższą sorpcję wykazywały materiały Vertex (chemoutwardzalny Castapress i termoutwardzalny Rapid Simplified), dla których uzyskano wyniki o tych samych tendencjach spadkowych i wzrostowych. Żywice Selectaplus i Selectaplus H wykazały mniejszą zdolność pochłaniania wody. Największe różnice w otrzymanych wynikach zaobserwowano w przypadku tworzyw ProBase (Cold i Hot).

EN

Eight acrylate resins used in dentistry were chem. or thermally hardened and studied for sorption of distd. H2O for a half a year. Finally, the level of sorption for chem. hardened resins was from -2.36% to +2.79% and -2.25% to +4.56% for thermally hardened ones. The differences were not substantial.

5

Projekt koncepcyjny bionicznej protezy kończyny górnej sterowanej za pomocą sygnałów elektromiograficznych

Zadroga Aleksander, Świerczewski Piotr

Przegląd Mechaniczny

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2019

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nr 9

33--36

PL

W artykule przedstawiono proces projektowania bionicznej protezy kończyny górnej sterowanej za pomocą sygnałów elektromiograficznych. Praca ma charakter projektowy. Określono wstępne założenia oraz wymagania do projektu, stworzono schematy ideowe oraz modele ruchu poszczególnych elementów obiektu, w wyniku czego otrzymano projekt koncepcyjny protezy. Zastosowanie sterowania za pomocą sygnałów elektromiograficznych daje użytkownikowi pełną i intuicyjną kontrolę nad protezą.

EN

The article presents design process of bionic upper limb prosthesis controlled with electromyographic signals. The conceptual design contains preliminary assumptions and requirements, schematic and block diagrams and models of specific elements of prosthesis. Use of electromyographic signals gives user intuitive and full prosthesis control.

6

Physiological parameters analysis of transfemoral amputees with different prosthetic knees

Li Sujiao, Cao Wujing, Yu Hongliu, Meng Qiaoling, Chen Wenming

Acta of Bioengineering and Biomechanics

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2019

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Vol. 21, no. 3

135--142

EN

Physiological parameters analysis allows for a precise quantification of energy expenditure of transfemoral amputees with different prosthetic knees. Comparative physiological parameters analysis that indicate the functional characteristics of knee joints is essential to the choice of transfemoral amputee. The aim of this study was to propose a microprocessor-controlled prosthetic knee (i-KNEE) and conducted physiological parameters (energy cost, gait efficiency and relative exercise intensity) comparison of transfemoral amputees with C-leg, Rheo Knee and Mauch under different walking speeds. Methodsː A microprocessor-controlled prosthetic knee with hydraulic damper (i-KNEE) was developed. A two-factor repeated measurement experiment design was used. Each subject was instructed to accept the same treatments. The two factors were type of prosthetic knees (the i-KNEE, the C-Leg, the Rheo Knee and the Mauch) and speed (0.5, 0.7, 0.9, 1.1, 1.3 m/s). The energy cost, gait efficiency and relative exercise intensity of ten transfemoral amputees were measured. Resultsː For all the prosthetic knees, the energy cost increased along with walking speed. There was no significant difference between three microprocessor-controlled prosthetic knees in energy cost. The gait efficiency of Mauch was always less than or equal to other three microprocessor-controlled prosthetic knees in specific walking speed. The relative exercise intensity increased with speed for all the prosthetic knees. More effort was needed for the transfemoral amputees with Mauch than other three microprocessorcontrolled prosthetic knees in the same walking speed. Conclusionsː The use of the microprocessor-controlled knee joints resulted in reduced energy cost, improved gait efficiency and smaller relative exercise intensity.

7

Innowacyjne procesy druku 3D – analiza ryzyka wdrożenia innowacji w branży stomatologicznej

Klimecka-Tatar D., Kapustka K.

Zeszyty Naukowe. Quality. Production. Improvement

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2016

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No. 1 (4)

92--106

PL

Branża medyczna jest oceniana jako jedna z bardziej nowoczesnych dziedzin gospodarki wymagających stosowania zaawansowanych technologii. Jednocześnie spełnienia wysokich oczekiwań społecznych dotyczących wprowadzania na rynek nowych sposób poprawiania stanu zdrowia pacjentów. Obecnie obserwuje się ciągły postęp w dziedzinie druku 3D, a możliwości aplikacyjne w przyszłości stworzą bardzo wartościowy rynek. Artykuł przedstawia analizę branży stomatologicznej, implementację nowoczesnego rozwiązania – druku 3D w wybranej klinice stomatologicznej, zapoznanie z systemami pracy drukarek 3D, macierz BCG do oceny możliwości rynkowych oraz przedsiębiorstwa, rozbudowaną analizę otoczenia SWOT oraz TOWS, kalkulację ceny produktu.

8

Zastosowanie technologii CAD/CAM w stomatologii odtwórczej : przegląd piśmiennictwa

Bębenek K., Błaszczyk A., Kiryk J., Kotowski D., Kowalska K., Szczygielski T., Mazgajczyk E., Szymczyk P., Badora G., Bryła E., Dobrzyński M., Rybak Z.

Inżynier i Fizyk Medyczny

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2016

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Vol. 5, nr 2

99--104

PL

Technologia CAD/CAM, obejmująca komputerowe wspomaganie projektowania CAD (Computer-Aided Design) oraz komputerowe wspomaganie wytwarzania CAM (Computer-Aided Manufacturing), już przeszło dwie dekady jest stosowana w stomatologii odtwórczej. W tym okresie nastąpił znaczny rozwój systemów wspomagających kliniczną pracę lekarza dentysty, co wynika przede wszystkim z rosnącego zapotrzebowania na coraz bardziej precyzyjne i wysoce estetyczne prace protetyczne, możliwe do wykonywania w jak najkrótszym czasie. Systemy wykorzystujące technologię CAD/CAM stanowią alternatywę dla tradycyjnych i czasochłonnych metod laboratoryjnych, tj. techniki traconego wosku, odlewnictwa z użyciem metalicznych stopów czy pokrywania ceramiką dentystyczną. Zaspokojenie wysokich wymagań pacjentów związanych z estetyką uzupełnień protetycznych uwarunkowane jest dostępnościąmateriałów niezbędnych do ich wykonania. Dlatego wciąż poszukuje się materiałów o jak najkorzystniejszych właściwościach fizykochemicznych oraz doskonałej estetyce przy jednoczesnym zachowaniu biokompatybilności. Pierwsze uzupełnienie protetyczne z użyciem systemu CAD/CAM zostało wykonane na początku lat osiemdziesiątych ubiegłego stulecia. Początkowo system ten wykorzystywano w wytwarzaniu m.in. koron, licówek, nakładów czy wkładów. Dynamiczny rozwój materiałoznawstwa, jak i samej technologii CAD/CAM umożliwił wykonywanie wielopunktowych mostów protetycznych oraz łączników bądź diagnostycznych szablonów implantologicznych.

EN

CAD/CAM technology, including computer aided design (CAD) and computer-aided manufacturing (CAM) more than two decades in restorative dentistry is used. Within this period, a significant development of systems has been observed to support the clinical work of a dentist. It is primarily due to the growing demand for increasingly precise and highly aesthetic prosthetic restorations as well as their quick performance. Systems using CAD/CAM technology constitute an alternative to traditional and time-consuming laboratory methods, ie. techniques of lost wax, molding using metallic alloys or dental ceramics coverage. Satisfying the high requirements of patients associated with aesthetic restorations results from the availability of materials necessary for their performance. Therefore, we continue to look for the materials with good physical and chemical properties as well as excellent aesthetics while maintaining biocompatibility. The first restoration using CAD/CAM system was made in the early eighties of the previous century. At the beginning, the system was used in the preparation i.e. crowns, veneers, onlays or cartridges. The dynamic development of dental materials and the CAD/CAM technology, allowed to perform multipoint bridges and prosthetic fittings or implant diagnostic templates.

9

ZrO2-CeO2 ceramic powders obtained from a sol-gel process using acetylacetone as a chelating agent for potential application in prosthetic dentistry

Nakonieczny D., Paszenda Z., Drewniak S., Radko T., Lis M.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 3

53--60

EN

Purpose: The main objective of this study was to obtain single-phase β-ZrO2 powders with so-called soft agglomerates reproducibile morphology with acetyl-acetone as a chelating-agent. To the best of our knowledge there is no avaiable data which determine the effect of acetyl acetone on the phase composition and morphology of ceria-doped ZrO2 powders for biomedical applications. Methods: Twenty variants of powders with different water to zirconia precursor and acetylacetone to zirconia precursor molar ratios were prepared. 0.9ZrO20.1CeO2 powders were obtained by a hydrolysis and condensation and further calcination of zirconium n-propoxide in a simple one-step sol-gel process. Influence of acetyloacetone to zirconia precursor on the phase composition ratio and water to zirconia precursor was investigated. Samples have been characterized by X-ray diffraction (XRD), Raman spectroscopy (RS), thermal analysis (TGA/DTA) and scanning electron microscopy (SEM) measurements. Results: Ceramic powders prepared by sol-gel process, according to the various concentration of chelating agent and water show different morphology and phase composition. Conclusions: Higher molar ratios of AcAc in range with smaller amounts of water cause hard agglomerates, obtained powders are characterized by highly thermally stable behaviour and various phase composition. With higher molar ratios of water to zirconium-n-propoxide so-called soft agglomerates and one phase powders are obtained.

10

Wpływ sposobu polimeryzacji i rodzaju tworzywa akrylanowego na wytrzymałość naprawianych elementów protez ruchomych : notatka laboratoryjna

Karońska K., Prylińska-Czyżewska A., Pryliński M., Pakuła J., Frączak B. A., Dorocka-Bobkowska B.

Przemysł Chemiczny

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2015

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T. 94, nr 11

2031-2032

PL

Przeprowadzone badania wykazały, że sposób polimeryzacji pod ciśnieniem oraz w podwyższonej temperaturze przyczynia się do zwiększenia wytrzymałości połączenia pomiędzy analizowanymi materiałami, natomiast nie stwierdzono statystycznie istotnych różnic pomiędzy poddanymi ocenie rodzajami żywic akrylanowych.

EN

Two com. acrylic resins were polymerized at 18–55°C in casts optionally under elevated pressure (2 bar) for 10 or 30 min, joined together by using the same acrylic resin at 37°C for 24 h and studied for bending strength in a 3-point test (500 N, 2.0 mm/min). The samples joined at elevated temperature and under increased pressure showed higher mech. strength.

11

Overview and general ideas of the development of constructions, materials, technologies and clinical applications of scaffolds engineering for regenerative medicine

Dobrzański L.

Archives of Materials Science and Engineering

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2014

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Vol. 69, nr 2

53--80

EN

Purpose: of this paper is the general presentation of the synergic utilisation of medical knowledge, tissue engineering and materials engineering for fabrication of functional substitutes of damaged tissues in the case of which medical indications show that classical prosthetics/implantation cannot be completely avoided, and that it is also appropriate to achieve natural ingrowth of the implanted elements into a living tissue in the implant area. Design/methodology/approach: This refers to post-injury losses, post-resection losses, as well as those originating from operative treatment of cancerous tumours or inflammation processes. Implantable biomedical devices are currently aggregately considered to be medical bionic implants where bionics is understood as production and investigation of biological systems to prepare and implement artificial engineering systems which can restore the lost functions of biological systems. Findings: The development of new hybrid technologies of bioactive and engineering materials for personalised scaffolds of tissues and bones requires a number of basic research and application work. They are presented numerous examples of the needs of the research for application of various bioactive and engineering materials, and their respective materials processing and tissue engineering technologies for manufacturing of the hybrid personalised implants and scaffolds. Research limitations/implications: There are no reports in the references about an original concept presented by the Author of introduction of prosthetics/implantation and tissue engineering techniques for the purpose of natural ingrowth of the implanted elements into a living tissue in the implant area without having to use mechanical devices, at least in the connection (interface) zone of bone or organ stumps with prosthetic/implant elements. Practical implications: They are open up vast possibilities for the application of the hybrid technologies of bioactive and engineering materials for personalized scaffolds of tissues and bones in accordance with the concept of the Author, presented in this paper. Medical bionic implants encompass numerous solutions eliminating various disfunctions of a human organism, among other implants of the cardiovascular system (stents, vessel prostheses, heart valves, pacemakers, defibrillators), digestive system implants, neuron devices (implants and neuronal prostheses to the central (CNS) and peripheral nervous system (PNS), the cochlea, retina), orthopaedic prostheses (bone grafts, bone plates, fins and other connecting and stabilising devices, including screws applied in the area of ankles, knees and hands, bars and pins for stabilising fractured limbs), screws and plates in skull-jaw-face reconstructions, dental implants, and also scaffolds of bones and tissues in tissue engineering. Originality/value: The Author’s idea for the embracing hybrid technologies of bioactive and engineering materials with titanium alloys including personalised scaffolds of tissues and bones will be created. It is also a challenge to achieve a synergy of clinical effects obtained with classical prosthetics/implantation of large lost post-injury or post-resection recesses together with the use of achievements in advanced tissue engineering methods at least in the interface zone of bone or organ stumps with prosthetic elements/implants.

12

Characterization of magnesia-doped yttria-stabilized zirconia powders for dental technology applications

Nakonieczny D., Walke W., Majewska J., Paszenda Z.

Acta of Bioengineering and Biomechanics

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2014

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Vol. 16, no. 4

99--106

EN

Purpose: This paper is focused on the works concerning on preparing zirconium oxide ceramic blocks recommended for CAD/CAM systems used in prosthetic dentistry for manufacturing fixed prosthetic restorations. Methods: Zirconium-yttrium-magnesium mixed ceramic oxides were prepared by sol-gel method via hydrolysis and condensation of zirconium alkoxide precursor (zirconium (IV) propoxide) with yttrium and magnesium nitrates diluted in 2-propanol. The aim of this work it was to obtain 2% mol yttria stabilized zirconia ceramic powders with magnesium as an additional tetragonal ZrO2 phase stabilizer in amount between 2÷6% mol (with 2% variable). Prepared gels were dried (24 h in 65°C). Obtained powders were mixed with binder (carboxymethyl cellulose) and uniaxial pressed in to a specimens with diameter 38 x 22 x 6 mm. Afterwards green bodies were sintered in range of temperature between 1350-1550°C. Powders and blocks were characterized by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, Specific Area Measurement. Results: Highly homogeneous powders with a low open porosity, was obtained. Prepared blocks after sintering showed numerous cracks. Nevertheless blocks was fine grained and show quite reproducible chemical composition. Conclusion: A sol gel wet chemical route of powder synthesis allow to obtain high homogenous ceramic materials with inconsiderable amount of pores with low variation in a diameter. In spite of a reproducible synthesis methods of a ceramic powders, applied to prepare green bodies procedure and sintering manner do not allowed to obtain free from cracks zirconia ceramics blocks.

13

What can normal gait biomechanics teach a designer of lower limb prostheses

Pitkin M.

Acta of Bioengineering and Biomechanics

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2013

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Vol. 15, no. 1

3--10

EN

Compensating a limb loss with prosthesis is a challenging task due to complexity of the human body which cannot be fully matched by the available technical means. Designer of lower limb prostheses wants to know what specification of the device could provide the best approximation to the normal locomotion. Deep understanding of the latter is essential, and gait analysis may be a valuable tool for this. Once prosthesis is built, gait analysis may help in comparing the wearer’s performance with the new device and with the prior art, and in verification of the hypotheses being put forward during the development process. In this lecture, we will discuss some synergies of normal gait. We will focus on the required biomechanical properties of a prosthetic leg that can allow the prosthesis’s inclusion in normal gait synergy without demanding excessive compensatory movements. We will consider contribution of leg joints to generation of propulsion for adequate design of lower limb prostheses especially those with power supply.

14

Nanokompozytowe materiały polimerowe wzmacniane nanocząstkami ceramicznymi do zastosowań w protetyce i stomatologii

Stodolak-Zych E., Jaworska K., Sas Ł.

Przetwórstwo Tworzyw

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2011

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[R.] 17, nr 6

525-528

PL

W pracy wytworzono i przebadano materiały nanokompozytowe przeznaczone na ruchome konstrukcje uzupełnień protetycznych (protez) i elementy aparatów ortodontycznych. Opracowano biokompatybilny nanokompozyt na bazie komercyjnej żywicy akrylanowej (PMMA), który modyfikowano dwoma rodzajami nanonapełniaczy; montmorylonitem (MMT) lub krzemionką (SiO2). Wytworzono serię tworzyw nanokompozytowych modyfikowanych nanometrycznym MMT lub nanometryczną SiO2 stosując zmienny udział nanonapełaniacza w osnowie (1, 2 i 5% wag). Jako materiał porównawczy zastosowano polimer pozbawiony obecności MMT/SiO2. Otrzymane tworzywa poddano charakterystyce mechanicznej i fizykochemicznej. Określano: moduł Younga (E), wytrzymałość na zginanie (RM), prace zniszczenia tworzywa (WUP). Na tej podstawie wyselekcjonowano układ kompozytowy poddany dalszym badaniom polegającym na określeniu wpływu środowiska zewnętrznego (sztuczna ślina) na trwałość tworzywa oraz na właściwości mechaniczne i trybologiczne układu (ścieralność).

EN

In the presented work nanocomposite materials destined for movable construction of prosthetic supplements (prostheses) and parts of orthodontic apparates were fabricated and investigated. A biocompatible nanocomposite basing on commercial acrylate resin (PMMA) was developed, wich was modified with two kinds of nanoadditives i.e. montmorillonite (MMT) and silica (SiO2). A series of nanocomposite materials modified with different amounts of MMT and SiO2 i.e. 1, 2 and 5 %wt was produced. Pure polymer was used as a reference material. Mechanical and physicochemical properties of the obtained materials were investigated. Young's modulus (E), bending strenght (RM),force up to breake (WUP) and microhardness of the materials were determined. Comparative studies of abrasibility of the materials were conducted. The nfluence of sourondings on durabiliy of the materials was monitored by measurements of pH of the immersion medium (artificial salina). Effect of incubation on mechanical and trybological properties of the materials was tested.

15

Układ pomiarowy czujnika sił zgryzu do zobiektywizowanej oceny wydolności narządu żucia

Kociubiński A., Duk M., Zyska T., Michalski W.

Przegląd Elektrotechniczny

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2010

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R. 86, nr 10

50-52

PL

Celem niniejszej pracy było zaproponowanie układu pomiarowego do określenia charakterystyki obciążającej siły zgryzu podczas czynności żucia. Stanowić on będzie narzędzie diagnostyczno-pomiarowe wspomagające lekarza stomatologa w obiektywnej ocenie biomechanicznej wydolności tkanek nośnych w polu obciążeń uzębienia naturalnego i uzupełnień protetycznych.

EN

The occlusal forces determine the functional efficiency of the organ of mastication apparatus in proportion to their power and frequency. The measurement of parameters mentioned above makes up the basis of the objectivized evaluation in clinical diagnostics of the biomechanical efficiency of mastication apparatus. The device proposed in this paper will be the diagnostic tool useful for the dentist doctor in objective evaluation of the biomechanical efficiency of bearing tissues in the zone of the natural teeth and orthotic supplements.

16

Porównawcza analiza wytrzymałościowa rekonstrukcji koron zębów bocznych metodami pośrednimi

Milewski G., Łagan S., Baran M.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 30

205-210

PL

W pracy dokonano porównania parametrów wytrzymałościowych oraz określono dopuszczalne wartości obciążeń zgryzowych dla przypadków zębów odbudowywanych pośrednimi wypełnieniami kompozytowymi typu inlay/onlay/overlay.

EN

The paper describes the comparative strength analysis of teeth crowns restored by means of the indirect filling systems of inlay/onlay/overlay type. The aim of this work was compare strength parameters of teeth's reconstructions with healthy teeth crowns.

17

Badania wad odlewniczych metalowych uzupełnień protetycznych

Hajduga M., Garlińska K.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2004

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z. 24

83-90

PL

Przedstawiono wady odlewnicze metalowych protez zębowych. Omówiono procedury związane z wykonaniem odlewów, użyte urządzenia, jak również niezbędne materiały wykorzystane do tego celu. Przeprowadzono badania metalograficzne powierzchni zewnętrznych (badania makroskopowe) oraz struktur wewnętrznych (badania mikroskopowe). Wykonano próbki metalograficzne, dzięki którym możliwa była obserwacja wad wewnętrznych odlewów. Na podstawie badań wyciągnięto wnioski, które oparto o Polską Normę: PN-85/H-83105.

EN

The report relate to defects of casting in metal dentures of teeth. The procedures including execute the moulding, used machines and the indispensabne materials have been described. Convey metalographic research the outside surface (macroscopic research) and inside structures (microscopic research). The metalographic samples were performed, which enable obsendng the inside defects of casting. On the ground of research draw results, that has been based on the PN-85/H-83105 norm.

18

Przyczyny niepowodzeń w leczeniu implantologicznym

Frączak B., Tutak M., Kijak E., Frączak P.

Inżynieria Biomateriałów

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2004

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R. 7, nr 37

27-29

19

Protetyka stomatologiczna wczoraj, dziś, perspektywy rozwoju

Ey-Chmielewska H.

Inżynieria Biomateriałów

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2003

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R. 6, nr 27

21-26