According to the data of modern medical literature, bone tissue is negatively affected by various factors, both external and internal. Trauma, concomitant diseases accompanied by mineral metabolism disorders, chronic intoxications, long-term and uncontrolled use of medications, especially narcotic analgesics, can lead to disturbances in the mineral composition of bone tissue and affect its ability to regenerate. The aim of our study was to establish the dynamics of the mineral composition of the bone tissue of the lower jaw after inflicting a bonedestructive trauma to animals without background pathology, on the background of long-term use of nalbuphine and after treatment with lincomycin. Object and research methods. Research material: 25 sexually mature male rats, weighing 180-200 g, at the age of 3.5 months. Modeling of the injury was carried out by breaking the integrity of the bone tissue of the lower jaw in the area of molars with the help of a drill. Opioid dependence was modeled by daily administration of the narcotic analgesic Nalbuphine. The method of atomic absorption spectral analysis (AACA) was used to determine the mineral composition. The results. The mineral composition of bone tissue at different stages of the experiment had pronounced dynamics in different groups of animals, characteristic to each of the studied elements. Conclusions. After the application of a bone-destructive trauma, the mineral composition of bone tissue during three weeks has pronounced dynamics, different for each of the eight studied mineral elements. The dynamics of the studied mineral elements during the three weeks of post-traumatic period in animals without background pathology, on the background of long-term use of Nalbuphine and in animals treated with lincomycin, is different.

A large number of external toxic factors contribute to the occurrence of a violation in hematological and biochemical status of the body. It is known that free radical oxidation plays an important role in maintaining the transport of electrons in the respiratory chain, inducing the formation of pores in the mitochondrial membrane, which regulate the coupling of respiration with oxidative phosphorylation and is the basis of oxidative processes in mitochondria. Oxidative processes involving activated oxygen metabolites are an integral part of the existence of higher forms of living organisms. It has been established that under extreme influences in the body, redox processes are activated, which lead to the formation of lipo – and hydroperoxides, the further decomposition of which contributes to the formation of endogenous oxygen, necessary for life. Superoxide is one of the main pro-oxidants in the cell, so superoxide dismutase plays a key role in the body’s antioxidant defense. The function of catalase consists in the destruction of toxic hydrogen peroxide, which is formed in the process of various oxidative reactions in the body. These processes directly affect the indicators of coagulation hemostasis and the degree of blood oxygenation, triggering a cascade of biochemical and hematological changes that affect the development of pathomorphological changes in the links of the hemomicrocirculatory channel and contribute to the violation of normal hemodynamic indicators. The purpose of the study is to establish indicators of coagulation hemostasis and the degree of blood oxygenation in the early stages of opioid exposure during its withdrawal with subsequent correction. When conducting our research, we used 78 white sexually mature outbred male rats, weighing 160-200 grams, which were injected intramuscularly with the drug «Nalbuphine» for 42 days. The number of platelets, prothrombin time, prothrombin index, recalcification time, total fibrinogen, hemoglobin and hematocrit value were determined in the blood of experimental animals at different times of opioid exposure. The obtained data were tested for normality using the Shapiro-Wilk test. The non-parametric Kruskel-Wallis H test for three or more independent groups was used to determine the significance of the difference between groups, followed by post hoc analysis using Dunn’s test. R v 4.0.3 and RStudio v 1.2.5042 software were used to perform statistical calculations. During the sixth week, the changes in the correction subgroup «cancellation + pentoxifylline» – the values of the indicators were as close as possible to the values of the corresponding indicators of the control group

Introduction. To determine the primary events of gingival microvascular complex damage caused by inflammation (28 days) on an acidotic model of periodontitis in 36 white mongrel rats, and to clarify regulatory factors of the structural recovery after metabolic correction (14 days). Materials and methods. Expression and severity of gingival inflammation were visually analyzed with an ANOVA test. The gingival tissue specimens were examined (x 4000-6000) after 42 days with a transmission electron microscope JEM-100 CX II (JEOL, Japan). Results and discussion. Vacuolation of the endothelial cells' cytoplasm, thickening and loosening of the basal lamina, narrowing of the microvascular lumen, aggregation of the red blood cells and dilation of perivascular space were characteristic features of inflammatory derangement. A significantly lower severity of gingival inflammation (p < 0.05), thin condensed basal lamina …