RESUMO
Orthopedic treatment is of particular difficulty in the complex therapy and rehabilitation of patients with precancerous diseases of the oral mucosa. In this regard, in patients with chronic inflammatory and destructive lesions of the oral mucosa, it is necessary to control changes in the oral cavity, taking into account clinical and laboratory data. Oral fluid is most often used as a diagnostic material in dental research, the composition and properties of which reflect functional changes in the body. However, the studies that substantiate rational orthopedic treatment in such patients are extremely insufficient: there are no data on the effect of orthopedic structures on the primary metabolism in the oral cavity in patients with precancerous diseases. In this regard, the purpose of this work was to study the biochemical parameters of the oral fluid in patients using orthopedic structures to identify the prognostic factors of precancerous conditions. In the oral fluid, the levels of total protein, total cholesterol, triglycerides, and lactate were determined. Free radical oxidation was assessed by the intensity of induced biochemiluminescence and by the levels of lipid peroxidation products. In the oral fluid of patients with mucosal precancer compared with patients in the control group, a significantly higher intensity of free radical oxidation was revealed with a corresponding decrease in antioxidant activity. The level of the end products of lipid peroxidation - Schiff's bases - was statistically significantly increased. Among the metabolites of the oral fluid, there was a decrease in protein levels and an increase in cholesterol and lactate levels. At the same time, a positive correlation was established between the indicators of free radical oxidation and lactate, free radical oxidation and cholesterol, but negative with the levels of protein and triglycerides. Regarding the antioxidant system, there was a negative correlation between the tg (-2α) value and the lactate level and positive with the triglyceride level, as well as a positive correlation between the Z parameter and the total protein level. The obtained changes in the biochemical parameters of the oral fluid can be used to confirm the diagnosis of precancer of the oral mucosa in patients with orthopedic structures.
