[Microdestruction of the bone].

The objective of the present study was the detection of microcracks in the compact bone tissue surrounding the fracture and in deformed bone undergoing subcritical loading. The portions of deformed bone tissue and terminal fragments of broken bones were obtained in the form of blocks longitudinally sawcut from the regions of primary and secondary bone rupture. A total of 300 such blocks were available for the examination.

[Age and gender changes of apatites from human hard tooth tissues].

Apatites of hard tissues of teeth of persons of different sex and age were studied in detail. It is shown that the crystal structure of apatites depends on changes in the composition of the enamel that happen during a person's life. Limits of the variations of the crystal lattice parameters of the enamel apatites connected with the complicate processes of de- and remineralization have been determined.

[Morphological structure, chemical and mineral composition of hard tooth tissues in age-related aspect].

The article presents the results of research on the structure, chemical and mineral composition of hard tooth tissues of persons of different age groups. The obtained data enable to estimate the resistance of tooth tissues to unfavorable factors of the oral cavity, which should be considered when planning treatment and prevention in patients with diseases of hard tissues of teeth caries and non-carious origin depending on their age.