Wyniki wyszukiwania - Biblioteka Nauki

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Wpływ pola magnetycznego o różnej charakterystyce fizycznej na ciśnienie tętnicze krwi u chorych z zespołami bólowymi kręgosłupa i współistniejącą chorobą nadciśnieniową

100%

Miecznik A. , Czernicki J. , Krukowska J.

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tom Vol. 7, nr 1-2

9-13

PL

W terapii pacjentów z zespołami bólowymi kręgosłupa stosuje się zabiegi magnetoterapii i magnetostymulacji. Autorzy ocenili wpływ tej terapii na ciśnienie tętnicze krwi w grupie 64 pacjentów z zespołami bólowymi kręgosłupa i współistniejącą chorobą nadciśnieniową. Uzyskane wyniki wskazują na efekt hipotensyjny zabiegów magnetostymulacji.

EN

In therapy patients with back pain syndromes are used measures of magnetotherapy and magnetostimulation. In this study a trial was made to estimate the influence of this therapy in a group of 64 patients with back pain syndromes and hypertensive disease. The obtained data proved that there is a hypotension effect after magnetostimulation.

2

Stress distribution in anchoring regions of posts cooperating with overdentures

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Chladek W. , Chladek G. , Krukowska J. , Lipski T.

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2005

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tom Vol. 7, no. 1

35-45

EN

The paper presents the results of model research of mechanical compatibility of selected overdenture structures. The tests based on finite elements method were conducted on flat models reflecting the areas of posts anchoring m a sagittal piane. The reference point was the structure of a prosthesis seated on ball-and-socket joints secured in tooth roots. As altemative solutions, dentures placed on two cylindrical implants supporting ball-and-socket joints were compared with a denture attached to a joint which consisted of a straight axis bar and an elastic clip as well as with a denture supported by a joint of elevated retention, built of a doubly bent axis bar and three elastic bar clips. Taking advantage of the MES Algor program functions, the diverse materiał structures of the systems investigated were modelled. Next. the reduced stresses and principal maximum stresses generated m osseous tissues, in the implants anchoring area. were determined. The value of the mechamcal stimulator decisive to the osseous tissue remodelling was assumed as au evaluatiou criterion. It was assumed that making use of patient's own tooth roots to attach implants IS an optimal solution which, in terms of mechanics, IS practically identical to the alveolodental ligament of a healthy tooth. The application of the other methods of implanted prosthesis attachment always creates a risk of undesirable changes, mostly in the upper area of post insertion into the osseous tissue. The least favourably, in the light of stresses comparison, looks the joint of a doubly refracted axis, where the probability of adverse changes of the osseous tissue in a short time is high. This indicates the necessity to carry on words in order to improve this solution characterized by good retention.

3

Estimation of stresses in layers of dentures' relining materials

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Żmudzki J. , Chladek W. , Krukowska J.

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2008

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tom Vol. 30, nr 1

21-24

EN

Purpose: Durability tests of materials relining dentures should be carried out in conditions reflecting the real loading that accompanies bite force transmission. The influence of geometry resulting from a denture foundation shape on real stresses in relining has not been so far found. Design/methodology/approach: Using FEM modeling, identified were the stress levels in relining layers in conditions reflecting biting loading for two opposite cases of bone foundation atrophy. Findings: The equivalent Huber-Mises` stresses have not reached their critical values, although tangential stresses on the interfacial where relining is bonded with denture base have reached 440kPa, which, for some of the commercial types of relining denotes the bonding strength. Research limitations/implications: The linear elastic mechanical characteristics were assumed. Hence, during further research, taken into account should be the “stiffening” of characteristics in the upper loadings range, which is typical for silicones. Practical implications: In case of a convex foundation the biggest danger will be caused by any bond defects occurring in the central area because in that area shear of bond has reached the highest values. Originality/value: Values of stresses components identified in this paper reflect the real shear conditions of relining bonding with denture base and might constitute a determinant for strength tests.

4

Analysis of corpus callosum size depending on age and sex

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Guz W. , Pazdan D. , Stachyra D. , Swieton F. , Poreba P. , Bednarz M. , Lis A. , Kazanska A. , Krukowska J. , Kleba J. , Urbanik A.

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nr 1

EN

Background: The aim of the study was to analyse changes in the size of the corpus callosum (CC) depending on age and sex and to establish the reference values of the morphometric indices of the CC in the Polish population. Materials and methods: The results of magnetic resonance studies of 1108 patients performed in the years 2010–2014 were analysed. Two independent radiologists evaluated cerebral images to exclude deviations from normal state. In patients divided according to sex and to 10 age groups, measurements of CC and brain dimensions were made and morphometric indices were calculated. Results: The results of measurements related to the following parameters: lengths of longitudinal cross-section of CC (CD), CC thickness in the narrowest place — isthmus (EF), the largest linear dimension of the brain from the frontal pole to the occipital pole (AB), the longitudinal cross-section area of the CC (A1) and cerebral cross-section area (A2) as well as CD/AB and A1/A2 ratios are summarised in 7 figures and 3 tables. Conclusions: It was demonstrated, that in all age groups there are statistically significant differences in the values of the analysed parameters and ratios of CC size. It was indicated, that there are no statistically significant differences between men and women in the CD, EF, and A1 parameters related to CC size, and the profiles of variations of these parameters are very similar. It was proved that there are statistical differences between women and men in parameters/indicators concerning of the brain size. (Folia Morphol 2019; 78, 1: 24–32)