Anopriyeva N. The structure of hard tissues and shape of the pulp chamber of human permanent teeth in normal and with pathological abrasion considering to age grading.

The thesis presents a new comprehensive data on the structural condition of hard tissues and pulp chamber of permanent teeth with pathological abrasion and has given a new assessment of their pathogenic nature. It was established the reduce of amount of ratio pulp chamber to the thickness of dentin with aging of teeth in normal and in teeth with pathological abrasion - normally a group of upper premolar it was equal to 25.84±1.15% at a young age and in mature age were 1.66 times less (15.54±1.33%) (p<0.001). This trend persisted in all groups of teeth. In teeth with pathological abrasion the dentin-pulp index in the group of upper premolars was 22.18±1.36% at a young age and 12.52±1.77% - in mature (p<0.001). For the first time, it was found that the degenerative processes in the pulp leading to the formation of pigment substances, as a result in hard tissue of teeth exposed to light brown color. This phenomenon is accompanied by sclerotic degeneration of dentin, which is in the obliteration of dentinal tubules, which is associated with a proportional expansion of segments of intertubular dentin, due to which they become the main ways of dental fluid leakage from dental pulp to the enamel. In addition, in dentin of molars occur stacked wavy stripes seal it organic matrix, which in configuration exactly reflect the shape of the dentin-enamel boundary.