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The thickness of the cortical bone in different maxillae using medical images

Human femur assessment using isotropic and orthotropic materials dependent of b...

The bone mass reduction and the deterioration of the tissue micron-architecture lead to a bigger fragility of the bone and to the consequent increase of the fracture risk. For this fact, it is considered excellent the quantification of the mass density and the verification of its influence in the bone resistance assessment. The apparent density is defined as the density without fluid influence, being the effect...

A influência da densidade óssea aparente na simulação de um fémur humano

A redução da massa óssea e a deterioração da micro-arquitectura do tecido leva a uma maior fragilidade do osso e ao consequente aumento de risco de fractura. Por este facto, considera-se relevante a quantificação da densidade de massa óssea e a verificação da sua sua influência de fluído, sendo a densidade efectiva a que inclui a massa de medula, essencialmente fluída. Essa medição é efectuada através da utiliz...

Human femur assessment using isotropic and orthotropic materials dependent of b...

The bone mass reduction and the deterioration of the tissue micron-architecture lead to a bigger fragility of the bone and to the consequent increase of the fracture risk. For this fact, it is considered excellent the quantification of the mass density and the verification of its influence in the bone resistance assessment. The apparent density is defined as the density without fluid influence, being the effect...

The thickness of the cortical bone in different maxillae using medical images

The aim of the present study was to investigate whether there is a relationship between the thicknesses of the cortical bone of mandible human and the age and the sex of patient. In this work the measure of the cortical bone thickness was obtained in different computed tomography (CT) dental of medical images. Different human mandibles were scanned using high resolution micro‐CT instrument in which many axial s...

Determination of nitrate and nitrite in dairy samples by sequential injection u...

A sequential injection analysis (SIA) system for the spectrophotometric determination of nitrate in dairy samples was developed. A test portion was aspirated into a carrier solution containing ethylendiaminetetracetic acid (EDTA) and ammonium buffer, which flowed into a copperized cadmium reduction column installed in-line for the determination of the nitrate plus nitrite contents of samples. For the nitrite de...

A new approach for the sequential injection spectrophotometric determination of...

A sequential injection system based on the ABTS (2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulphonic-acid) methodology was developed. The proposed method, incorporating a mixing chamber in the side port of the selection valve, was evaluated to measure the total antioxidant activity of several beverages and foods. The ABTS•+ is generated by oxidation of ABTS with potassium persulfate and is reduced in presence of...

Sequential injection titration of chloride in milk with potentiometric detection

In this work, a sequential injection system for the pseudo-titration of chloride in milk is described. Milk was directly aspirated into the system and sandwiched between two silver nitrate plugs (titrant). The aspirated zones were then propelled to the detector (Ag2S/Ag tubular electrode), where the depletion in the titrant silver concentration (due to the formation of a AgCl precipitate) was monitored. The res...