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Wyświetlanie 1-10 z 53
Tytuł:
Influence of the intramedullary nail locking method on the stiffness of the bone-implant system
Autorzy:
Jasiurkowska, Karolina
Bieżyński, Janusz
Nikodem, Anna
Filipiak, Jarosław
Tematy:
intramedullary nail
femur
dog bone
Micro-CT
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/55622120.pdf  Link otwiera się w nowym oknie
Opis:
Bone fractures are one of the most commonly seen problems in veterinary traumatology. The authors of this study strive to find a new intramedullary nail, which is intended for treating femoral bone fractures for canine patients. The purpose of this study was to analyze biomechanical parameters of the intramedullary nails, which use a new bolt system concept. Methods: Dissected femoral bones of a large breed dog were cut in order to simulate interfragmentary gap, and then the bones were stabilized using intramedullary nail with locking bolts. Bone-nail systems were subjected to cyclic loading using force which corresponds to the load on the femoral bone in the first few days after surgery. Micro-CT scans were taken of the bone samples around implant in order to determine deformation and structural parameters of bone tissue. Results: The calculation of the bone-nail system stiffness was done through analysis of the forcedisplacement curves recorded during experimental studies. Using monocortical locking bolts resulted in smaller stiffness of the bone-nail system than using bicortical locking bolts. Conclusions: The results obtained in this study can indicate that the intramedullary nail could work well when used for treatment of bone fractures in dogs. The authors focused on using monocortical bolts which provides good stability and adequate biomechanical environment. Described fixation method is easily adjustable to a particular patient individual parameters.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the mechanical properties of femoral cartilage tissue in advanced osteoarthritis
Autorzy:
Dragan, Szymon Ł.
Kuropka, Piotr
Kulej, Mirosław
Gabryś, Piotr
Nikodem, Anna
Tematy:
tkanka chrzęstna
histologia
właściwości mechaniczne
cartilage tissue
osteoarthritis
indentation test
histology
mechanical properties
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/306228.pdf  Link otwiera się w nowym oknie
Opis:
The main goal of this article was the analysis of the changes of mechanical properties, thickness and histology of the cartilage in different regions of the femur head in advanced stage of the osteoarthritis. Methods: The study material consisted of cylindrical specimens (9.7 mm) prepared form proximal epiphysis of the human femur bone after hip arthroplasty. The thickness was determined from the reconstruction of the specimen from microtomography (SkyScan 1172, Bruker®) images. Mechanical properties of the cartilage tissue were identified in static indentation test conducted the use of MTS® Synergie 100 testing machine. Histological study enabled us to determine cartilage total thickness as well as location and orientation of the collagen fibers. Results: Depending on the region of the head, the cartilage tissue thickness was in the range (0.74–2.23 mm). The lowest thickness values were obtained for the R5 region and the lowest for R4. Samples from R1–R4 regions differ by 24%. Measurements of cartilage tissue indentation, determined with the help of Hayes’ formula, showed that the values of mechanical parameters in regions R1, R2, R3 and R5 have similar values (the difference between them is about 5.5%). Region R4, which had the smallest thickness, also had the lowest values of mechanical parameters. Conclusions: Using κ coefficients, proposed by Hayes, enabled us to obtain similar values of mechanical parameters in the regions R1, R2, R3 and R5, despite differences in cartilage tissue thickness. The R4 region, which had the weakest mechanical parameters, was characterized by the strongest reduction of the articular cartilage tissue, which was accompanied by an unformed mass of cartilage residue originating from the abraded surface and bursa fluid.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The assessment of temperature amplitude arising during the implant bed formation in relation to variable preparation parameters – in vitro study
Autorzy:
Kosior, Piotr
Nikodem, Anna
Kozuń, Marta
Dudek, Krzysztof
Janeczek, M.
Dobrzyński, Maciej
Tematy:
dental implant
thermal damage
bone
osseointegration
thermography
microtomography
implant dentystyczny
uszkodzenie termiczne
kość
osteointegracja
termografia
mikrotomografia
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/55622042.pdf  Link otwiera się w nowym oknie
Opis:
The main purpose of this study was to analyse the temperatures generated during the bone bed preparation, given the internal structure of the bone bed, the geometry of the hole, and the treatment parameters such as the type of cooling and the rotational speed of the drill. The investigated material was domestic pig ribs, in which holes were drilled three times using two drill bit systems used for Hiossen® and Paltop® dental implantation. The ThermaCAM® P640 thermal imaging camera was used for measurement of drilling temperatures. After the holes were drilled, each rib was examined using the 1172 SkyScan microtomograph, Bruker®, to compare the geometry of the machined holes. The presented study proved that larger diameter drill bits (Hiossen® drill bits) generate more heat during the machining process, as evidenced by higher temperatures obtained for the Hiossen system in each case. It was proved that rotational speed, drill bit diameter and cooling system have a significant effect on the amount of heat generated during bone tissue preparation. The density and type of bone tissue in which the hole is prepared are significant factors affecting the amount of heat generated.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of the Fluoride Ion Release from nanofluorapatite-modified orthodontic cement under different pH Conditions - an in Vitro Study
Autorzy:
Dobrzynski, Wojciech
Nikodem, Anna
Diakowska, Dorota
Wiglusz, Rafał Jakub
Watras, Adam
Dobrzynski, Maciej
Mikulewicz, Marcin
Tematy:
fluoride release
fluoride recharge
orthodontic cement
glass-ionomer cement
nanosized particles
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/55622212.pdf  Link otwiera się w nowym oknie
Opis:
Construction of the orthodontic bracket promotes food accumulation, which is the cause of plaque formation. Modern trends in the design of adhesive orthodontic cements focus on the ability to release cariostatic fluoride ions. One of the methods is to incorporate the material with fluorapatite nanoparticles. The aim of the study was to determine the fluoride release capacity of orthodontic cement doped with nanosized fluorapatite in selected media and solution pH over a 12-week period.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An in vitro examination of fluoride ions release from selected materials – resin-modified glass-ionomer cement (Vitremer) and nanohybrid composite material (Tetric EvoCeram)
Autorzy:
Kosior, Piotr
Klimas, Sylwia
Nikodem, Anna
Wolicka, Justyna
Diakowska, Dorota
Watras, Adam
Wiglusz, Rafał J.
Dobrzyński, Maciej
Tematy:
fluoride ions release
nanohybrid composites
microhardness
resin-modified glass ionomers
tooth decay prevention
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/55622186.pdf  Link otwiera się w nowym oknie
Opis:
The aim of this study was to examine a short-term fluoride ions release from selected materials – resin-modified glass ionomer –Vitremer (3M ESPE) and nanohybrid universal composite – Tetric EvoCeram (IvoclarVivadent). Release of fluoride ions [µg/mm2 /h] from Tetric EvoCeram and Vitremer into nine environments (artificial saliva – AS, deionized water and 0.9% NaCl) differing in composition of the solution and pH was determined. Six samples were prepared for each solution. In the short-term study, the measurements were taken after 1, 3, 24, 48, 72 and 168 hours. The cumulative values as well as levels of fluoride ions released at concrete time intervals were compared. Within 7 days (168 hours), both materials showed variable levels of fluoride ions release. The highest value of fluoride ions release from nanohybrid Tetric EvoCeram material was reported in deionized water (8) after 24 hours (1.550 ± 0.014 [µg/mm2 /h]) and the lowest value was read in the artificial saliva AS pH 7.5 (5) after 1 hour (0.022 ± 0.001 [µg/mm2 /h]). What’s more, the highest value of Frelease from Vitremer was found in deionized water (8) after 168 hours of immersion (24.021 ± 2.280 [µg/mm2 /h]) and the lowest value was in the artificial saliva AS (without Ca2+) pH 4.5 (6) (0.303 ± 0.249 [µg/mm2 /h]) after 168 hours. Cumulated release of F– after 7 days was notably higher from resin- modified glass ionomer material – Vitremer in all artificial saliva solutions (1–7) which imitated the environment of oral cavity. Therefore, we can assume that Vitremer has better remineralization potential and it may constitute a more effective method of tooth decay prevention.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Usefulness of subtraction thermography in the evaluation of blood vessels and lymphatic vessels in the dental pulp
Autorzy:
Wiśniewska, Kamila
Szymonowicz, Maria
Kuropka, Piotr
Rybak, Zbigniew
Struzik, Natalia
Dudek, Krzysztof D.
Nikodem, Anna
Dobrzyński, Maciej
Tematy:
thermography
human dental pulp
lymphatic and blood markers
lymphatic vessels
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/58969740.pdf  Link otwiera się w nowym oknie
Opis:
Caries or iatrogenic thermal trauma of the teeth have a significant impact on the dental pulp structure connected with stimulation of angiogenesis and lymphangiogenesis. Therefore, the aim of the study was to identify the difference in the rate of heat dissipation by vessels present in the dental pulp. Methods: Freshly extracted healthy (n = 10) and carious (n = 14) molars and premolars were cut on a diamond saw and subjected to active thermographic examination and then subjected to lymphoscintigraphy and X-ray examination. The tooth samples were heated uniformly to 40 ± 0.5 °C. A thermal imaging camera with a resolution of 640 × 320 pixels was used to record the sequence of thermograms during free cooling. Due to the different volume of teeth and different surface conditions of the examined teeth (color, roughness) and the related different radiation emissivity, the changes in the temperature (ΔT) of the tooth cross-section surface were analyzed using the subtractive method within 120 seconds from the switching off of the thermal impulse (heating). Results: Thermographic examination of healthy and cariously changed teeth revealed areas of increased tissue fluid flow combined with heat release, which may indirectly indicate the existence of vessels in these areas. On a thermal imaging camera, variations in the rate of heating or cooling across several cross-sectional sections of the same tooth indicate changes in the dental structure’s density. Conclusions: In caries-affected teeth, intracanalicular fluid flows are different than those of healthy teeth. Therefore, it can be concluded that the pulp vessels enabling circulation of body fluids – blood and lymphatic – increases with the intensity of inflammation. Maintaining the homeostasis of the dental pulp depends heavily on the circulation of bodily fluids within the dental organ.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the microbial, cytotoxic and physico-chemical properties of the stainless steel crowns used in pediatric dentistry
Autorzy:
Sztyler, Klaudia
Pajączkowska, Magdalena
Nowicka, Joanna
Rusak, Agnieszka
Chodaczek, Grzegorz
Nikodem, Anna
Wiglusz, Rafał J.
Watras, Adam
Dobrzyński, Maciej
Tematy:
pediatric crowns
primary teeth
teeth restoration
microbial biofilm
physico-chemical properties
cytotoxicity
material composition
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/55622170.pdf  Link otwiera się w nowym oknie
Opis:
Preformed stainless steel crowns are used in pediatric dentistry to obtain full crown restoration of primary molar teeth. They are consider the best restoration in terms of durability and effectiveness. The purpose of this study is to evaluate microbial, cytological and physio-chemical properties to determine whereas stainless steel crown are biocompatible, safe for surrounding tissue and helpful in avoiding micro-organisms influence on the tooth tissue. Based on the results, it was determined that stainless steel crowns used in pediatric dentistry represent no cytotoxic risk to the surrounding tissues, have a low probability of developing hypersensitivity to the coronal material and also that their biological properties make them suitable to use in pediatric dentistry for the reconstruction of damaged primary molar tissue.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 53

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