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The assessment of temperature amplitude arising during the implant bed formation in relation to variable preparation parameters – in vitro study

Kosior Piotr, Nikodem Anna, Kozuń Marta, Dudek Krzysztof, Janeczek M., Dobrzyński Maciej

Acta of Bioengineering and Biomechanics

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2021

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Vol. 23, no. 3

163--173

EN

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.

2

Modelling of thermal damage process in soft tissue subjected to laser irradiation

Jasiński M.

Journal of Applied Mathematics and Computational Mechanics

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2018

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Vol. 17, nr 2

29--41

EN

The numerical analysis of thermal damage process proceeding in biological tissue during laser irradiation is presented. Heat transfer in the tissue is assumed to be transient and two-dimensional. The internal heat source resulting from the laser irradiation based on the solution of the diffusion equation is taken into account. The tissue is regarded as a homogeneous domain with perfusion coefficient and effective scattering coefficient treated as dependent on tissue injury. At the stage of numerical realization, the boundary element method and the finite difference method have been used. In the final part of the paper the results of computations are shown.

3

Variation of Wave Velocity and Porosity of Sandstone after High Temperature Heating

Sun Q., Zhang W., Su T., Zhu S.

Acta Geophysica

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2016

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Vol. 64, no. 3

633--648

EN

This paper reports the variations of mass, porosity, and wave velocity of sandstone after high temperature heating. The range of temperature to which the sandstone specimens have been exposed is 25-850°C, in a heating furnace. It has been shown that below 300°C, porosity and wave velocity change very little. Above 300°C, there is a rapid increase in porosity, but the wave velocity decreases significantly. The results of thermo gravimetric analysis (TGA), differential scanning calorimetry (DSC) and mercury intrusion porosimetry (MIP) suggest that a series of changes occurred between 400 and 600°C in sandstone could be responsible for the different patterns of variation in porosity and wave velocity

4

Theory of reinforcement predicting low temperature damage in composites

Wilczyński A.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1999

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z. 9

279-284

EN

Theories of reinforcement, used as w tool for predicting elastic or thermal properties of composites have proved their worth in many cases. Predicting failure of these materials in most cases is of much greater difficulty and generally avoided by authors for several reasons, mainly caused by theoretical difficulties in obtaining analytical solutions for the problem, which are often, as in the case of laminates, almost unsurpassable. The present paper presents a case, where special selection of the theory of reinforcement, for a somewhat limited type of composite, leads to an analytical solution, which can be finally computerised.

PL

Zastosowanie teorii wzmocnienia kompozytów do przewidywania własności sprężystych nie budzi żadnych wątpliwości i znajduje coraz szersze wykorzystanie w praktyce. W kwestii przewidywania własności wytrzymałościowych jednak sprawa przedstawia się o wiele gorzej i trzeba wykorzystać wszelkie możliwości istniejące w teorii wzmocnienia aby taka działalność doprowadziła do zadawalających wyników. Praca przestawia wybraną teorię wzmocnienia i wynikające z niej możliwości przewidywania wytrzymałości na przykładzie stosunkowo mało badanych obniżonych temperatur.