Изучение влияния дисплазии соединительной ткани на характер и качество прорезывания зубов человека в позднем постнатальном периоде онтогенеза

It was necessary to study the quality of the hard tissues of teeth 38, 48 and the lower jaw in the projection of these teeth in the late period of postpartum ontogenesis. Material and methods. The research involved 102 male patients, 76 with connective tissue dysplasia (CTD) and 26 without CTD. They were divided into the groups by age: 31—40, 41—50, 51—60 years old. All of them had one intact tooth 38 and 48 extracted for medical reasons. A fragment of the alveolar part of the lower jaw in the projection of teeth 38 and 48 was taken too at the same time. We analyzed condition of crown and root systems of extracted teeth 38, 48, densitometric density of mineral component of teeth enamel, sizes of enamel prisms, spatial organization of collagen fibers of bone tissue, dimension characteristics of bone plates and mineralization centers of lower jaw. Results. High optical density values are observed at the age of 31—40 years (U=2.0602, p=0.0476 relative to the 41—50 years group), at the age of 51—60 years (U=3.6029, p=0.0239 relative to the 41—50 years group), at the age of 41—50 years values are reduced (U=1.0628, p=0.05291) in CTD. Despite the increase in the optical density of the lower jow at the age of 31—40 years with CTD in the points m1vl (rs=0.954, p=0.047) and m2al (rs=0.871, p=0.035) after 40 years there is a decrease in mineral density, where total areas of hypomineralization appear. At the ages of 41—50, 51—60 years, pronounced sclerosis and deformation of demarcation elements are observed at the border of connective tissue structures and periosteum, at 31—40 years these changes are expressed moderately. At the age of 31—40 years the level of lamina delamination is single, after 40 years it is multiple. Conclusion. Morphological changes in bone tissue and the slow rate of maturation of teeth 38, 48 are a barrier to their correct and harmonious teething after 30 years.