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Complex functions connected mainly with directed motion, power transmission, and material forming, are performed in biotribological systems. This concerns both technical biotribological systems (machines and devices) as well as human biosystems – especially joints, and teeth and parodontium. The basic function of joints is to transmit complex dynamic loadings. Within the area of teeth and parodontium – an element of a stomatognathic system – taking nutrients and preparing them for digestive processes take place. Durability of such biotribological systems is directly reflected in the functioning of the whole human organism. Lesions and mechanical injuries of joints lead to unfavourable changes which often impede normal locomotion in humans. Similarly, in tooth systems, deterioration of hard tooth tissues, most often because of attrition and caries processes, makes normal functioning of stomatognathic systems much difficult. One of more and more popular methods applied in repairing human joints is endoprosthetics, i.e. a surgical treatment consisting in replacing a diseased joint with an artificial apparatus – an endoprosthesis. In the case of defects in hard tooth tissues, the defects are either filled or the damaged tooth is replaced with an implant. Biomaterials used for these purposes, beside having a number of biofunctional features, should have very good tribological characteristics – low friction coefficients and antiwear performance. Progress in reconstructive surgery of human joints and in conservative dentistry, in particular selecting appropriate biomaterials and constructions, depends to a large extent on getting to know these biotribological systems, which facilitates producing more reliable functional and structural models of the systems, and thus results in developing 0more correct methods of assessing their biotribological characteristics. Fig. 1. shows a graphical representation of a general functional model of a biotribological system, in which, beside the classical external environment, the environment of an autonomous character is marked together with the feedback of parameters characteristic of the input-output function. It is a proposal of a system functional model of the “black box” type. It has to be emphasised, however, that transferring achievements of the methodology of biotribological research on technical systems to biological systems has to be preceded by analysing the differences between these two types of systems. Beside selecting basic parameters for making such an analysis, mainly parameters concerning kinematics of motion and loading dynamics, phenomena and their effects occurring in the autonomous

Composite Materials for Some Biotribological Systems