Biomedical subjects

D Milcić

Publications and source records attributed to D Milcić.

4 recordsLinked to original sources

PubMed2001

The compact formulation of anthropodynamical measures in physiological anthropology.

In this paper, an interdisciplinary combination of several state-of-art methods from biomechanics, modeling and multibody dynamics of the humans is described. The description of the human figure in the motion is a very important part of biomechanical analysis. In such current methods it is necessary to us mass moment of inertia as a part of the fundamental dynamic anthropomeasure when describing this motion. The goal of this work is to use and modify existing techniques and to investigate what have to be analyzed to make them work together. First, some general definitions and descriptions of mass moment of inertia adapted to anthropometric values of our population. Second, there is also a review of some simple models by means of which it is possible to calculate distribution of the body-part masses during the motion. The results are given in the form of equations and tables which present the functions between selected body parts anthropodynamical measures and percentile distribution values of males as well as females of Croatian population.

Adult↗

PubMed2000

Model for computer simulation of bone tissue.

The paper deals with the dependence of the torsional moment on the angle of the compact bone torsion in laboratory animals and humans. Based on the data for laboratory animals obtained by measurements, the data on dependence of the torsional moment and the angle of torsion were predicted for humans. The measurements were carried out in four groups of laboratory animals. One was the control group, and the other three groups were treated by various vitamin D3 metabolites. The same measurements were performed also in only one group of humans, due to the impossibility to treat humans with vitamin D3 metabolites. The functional relationship between the angle of torsion and the torsional moment for all the groups of animal bone tissue were determined by measurements, and results were used to predict the reaction of the human compact bone tissue if treated by vitamin D3 metabolites.

Animals↗

PubMed2000

Dynamic effects of food consistency on chewing motions.

The purpose of the study was to find evidence of how different types of food consistency affect chewing motions, especially the forward, downward and sidewise extents of motion of the lower jaw. Nineteen individuals with intact tooth sequence, aged from 20 to 37 years, were asked to chew three types of food of different consistency (banana, bread, carrot). The motions of the lower jaw were recorded by ELITE system, i.e. the measurement instrument that by stereo-photo-grametric procedures calculates space co-ordinates of markers on faces of the study subjects. The system enables continuous recording of lower jaw motions in three dimensions, without any possibility of the study subjects' influencing the operation of the instrument, which significantly decreases the possibility of error. Study results have shown that in all 19 subjects a greater food consistency increases the extent of chewing motion. In each individual study subject different average values were found for equal shifts of lower jaw when chewing the same type of food. Although varying from subject to subject, the chewing cycle depends to a great extent on food consistency. By increasing the consistency of a bite, the extent of lower jaw motion has increased in every single study subject.

Adult↗

PubMed2000

Three dimensional model of the human mandible.

A new biomechanical three-dimensional (3D) model for the human mandible is proposed. A simple two-dimensional model cannot explain the biomechanics of the human mandible, where muscular forces through occlusion and condylar surfaces are in a state of dynamical 3D equilibrium. All forces are resolved into components according to a selected coordinate system. The muscular forces, which during clenching act on the jaw, along with the necessary force level for chewing, also act as some kind of stabilizers of the mandibular condyles preventing dislocation and loading of nonarticular tissues.

Biomechanical Phenomena↗