QUANTITATIVE ULTRASTRUCTURAL ANALYSIS OF NEUROTUBULAR APPARATUS OF THE MYELIN FIBERS OF DENTAL PULP IN CHILDREN BORN AND LIVING IN PLACES WITH HIGH ECOLOGICAL AND TECHNOGENIC LOAD

Abstract

The purpose of the study is a quantitative analysis of myelin nanotubular apparatus of the conductors included in the neurovascular bundle of the tooth pulp in children born and living in places with high ecological and technogenic load. The object of the study was the neurovascular bundle of the tooth (№ 540), removed for medical reasons, in children aged 5 to 14 years (the period of eruption of permanent teeth), living in conditionally favorable areas of Udmurtia and in places with high ecological and technogenic load. Areas with high ecological and technogenic load were considered to be places near the machine-building plant, poultry farms, large motor transport enterprises and highways, etc. (Izhevsk); location of the largest oil depot in the Republic, asphalt and chemical plants of the Kama region of the Republic (Kambarka); the territory of woodworking, furniture factories, woodworking factory “Red Star” (Mozhga); forestry industry (Uva). The influence of living conditions on the composition and ultrastructural provision of the myelin nerve fibers of the tooth pulp is shown: the number of microtubules (regardless of the fiber diameter) and neurophilaments (for conductors of large and small diameters) in the conditions of ecological and technogenic load is reduced. It is noted that differences in living conditions (places with ecological and technogenic load) do not affect the ultrastructural provision of myelin conductors at the time of eruption of permanent teeth (5 years), but quantitative changes progress over time, starting from the period of second childhood (8-12 years) reaching maximum values by the age of 14. The age of 11 years is a critical period with regard to the definition of the neurotubular apparatus of myelin nerves in children living in places with unfavorable ecological and technogenic load.