EFFECTS OF PROFESSIONAL ORAL HYGIENE AND TEETH WHITENING ON THE MICROELEMENT COMPOSITION OF ENAMEL.

OBJECTIVE: Aim: The objective of this study is to investigate the impact of professional teeth cleaning and the substances used in modern dentistry for whitening on the microelement composition of tooth enamel. PATIENTS AND METHODS: Materials and Methods: To study the morphology and microelement composition of the enamel, scanning electron microscopy was performed using the MiraLM microscope equipped with a Schottky field emission electron gun from Tescan. RESULTS: Results: A comparative analysis between the areas subjected to mechanical cleaning and those where it was not applied revealed a significant difference in the research results, particularly in carbon, which changed from 25.16±1.04 to 32.02±1.8. An analysis of the enamel's chemical composition before and after whitening revealed a decrease in carbon from 45.91±1.20 to 42.46±1.74. The change in phosphorus content was determined to be from 9.77±0.39 to 9.56±0.75. A decrease in calcium from 15.96±0.64 to 15.21±1.22 and magnesium from 0.07±0.01 to 0.01±0.01 was also observed. CONCLUSION: Conclusions: Professional dental hygiene does not have a direct impact on the microelement composition of enamel, such as the levels of calcium, phosphorus, fluoride, and other microelements. However, it can have an indirect and temporary influence due to the use of abrasive materials that affect dental deposits, pellicle, and the surface layer of enamel. Teeth whitening can affect the microelement composition of enamel, but these changes are mostly temporary and associated with processes of demineralization/ remineralization and oxygenation.

EXPERIMENTAL STUDY OF CHANGES IN THE CHEMICAL COMPOSITION OF TOOTH ENAMEL WHEN USING HYDROGEN PEROXIDE AS THE MAIN CHEMICAL COMPONENT IN PROFESSIONAL BLEACHING.

OBJECTIVE: The aim: To study changes in the chemical composition of the tooth enamel surface when using hydrogen peroxide as a chemical component of the whitening system in combination with professional oral hygiene. PATIENTS AND METHODS: Materials and methods: To achieve this goal, during the study, we studied the enamel of the teeth of the frontal area, which was removed for orthodontic and orthopedic indications. The age of the patients whose teeth were examined ranged from 18 to 44 years. In the experiment, we studied the chemical structure of enamel by a method thatcovered the selection of the study area, with the designation of areas for microanalysis, and subsequent elemental analysis in selected areas of the enamel. RESULTS: Results and conclusions: Analyzing the results of this study, we can make assumptions about the impact of professional dental hygiene on the procedure of photo-whitening teeth based on 35% hydrogen peroxide gel and its subsequent impact on theother clinical indicators, which will depend on the characteristics of functional and structural resistance of the enamel.

INTERRELATION OF BIOLOGICAL RHYTHMS AND CIRCADIAN HORMONES PRODUCEMENT AND THEIR IMPACT ON MEDICINE USAGE.

OBJECTIVE: The aim of the article is to establish the interrelation of human biological rhythms and circadian hormones producement as well as to determine their impact on the medicine usage. PATIENTS AND METHODS: Materials and methods: The review and latest data analysis of scientific and medical literature were performed. CONCLUSION: Conclusions: Proceeding from the literature sources there is a firm interrelation between human biological rhythms and circadian hormones producement. Following chronotherapy principles will allow to increase effectiveness of diseases treatment, including dental ones. It will also allow to reduce dosage of prescribed medicines as well as their side effects. Prospects for a further research are to identify a clear relationship between circadian biorhythms in patients with chronic generalized periodontitis in order to increase the effectiveness of therapeutic measures.