Перегляд за Автор "Bilous, A. M."
Зараз показуємо 1 - 2 з 2
Результатів на сторінці
Налаштування сортування
Документ Dental crown biomineralization during its histogenesis(Aluna Publishing, 2020-12) Kostyrenko, O. P.; Vynnyk, N. I.; Koptev, M. M.; Hasiuk, P. A.; Skrypnyk, M. I.; Bilous, A. M.; Proskurnya, S. A.; Костиренко, Олексій Петрович; Винник, Наталія Іванівна; Коптев, Михайло Миколайович; Гасюк, Петро Анатолійович; Скрипник, Максим Ігорович; Білоус, Алевтина Миколаївна; Проскурня, Сергій АнатолійовичThe aim: Thepaper wasaimedat thestudyof thebiomineralization processesofa permanentdental crown in thepostnatal period of histogenesis. Materials and methods: The study involved 30 culled puppies aged 30-40 days. To study the histogenesis of the germs of the permanent tooth from the cuticular epithelium in the postnatal period microscopic, electron microscopic, immunohistochemical methods of study have been used. Results: The studies show that in the postnatal period, the maturation of the germ of a permanent tooth starts with the synthesis of cells of the cuticular epithelium of the organic stroma, capable of subsequent mineralization. Differentiation of the proameloblasts, located on the surface of the dental papillary mesenchyma, at the early stages of histogenesis, is strongly associated with the appearance of a specific protein taftelin. Origination of secretory ameloblasts, which produce the protein enamelin, triggers the process of secondary biomineralization of the enamel. The terminal processes of the secretory ameloblasts produce the protein in the form of layers that overlap each other at a certain angle. Such layering of the structures of enamel and dentin contributes to the S-shaped maturation of the hard tooth tissues, strengthening them considerably. At the follicle stage, maturation of the dental crown, coated with cuticular epithelium, occurs. Invaginations of the cuticular epithelium form a characteristic topography of the dental crown, and enamel projections are further formed by the ameloblasts. Epitheliocytes of the inner layer of the enamel organ have desmosomal connections that allow the filtration of the salivary fluid at the stage of the enamel trophism. Conclusions: The findings of the study suggest that, normally, due to the cuticular epithelium, filtration of the salivary fluid occurs with protein deposition on it and subsequent infiltration of the calcium salts into the subjacent enamel.Документ X-ray analysis of the mandible in patients with crossbite and mandibular displacement(Aluna Publishing, 2019) Smahlyuk, L. V.; Kulish, N. V.; Bilous, A. M.; Luchko, O. V.; Смаглюк, Любов Вікентіївна; Куліш, Неля Володимирівна; Білоус, Алевтина Миколаївна; Лучко, Олена ВолодимирівнаSignificant morphological and aesthetic disabilities of the face, observed during the formation of a cross bite in combination with the displacement of the mandible, prompt the doctors – orthodontists to study carefully the morphogenesis of this anomaly. Analysis of the mandible structure in patients with a cross bite and lower jaw displac ement based on the analysis of orthopantomograms. For this study, the orthodontic examination of 20 patients, 18-22 years old, was made they complained about facial asymmetry, displacement of the lower jaw and a violation of the cosmetic centers. A diagnosis of the buccal cross bite form in combination with the displacement of the lower jaw was put according to the Uzhumeckiene classification. The methods used do not contradict the conclusions of the ethics commission. The analysis of the obtained data indicates that the angle of the mandible has more variable (p ≤ 0,05). Go120,8º and 125,1º. Significant of the angles of the canines according to the basal arch of the lower jaw of 102,8º and 105,4º (p≤0.01) and the angle of inclination of the first permanent molars of 89,6º and 91,4º, respectively (p≤0.01). Conclusions: The obtained data indicate that there is no clear correlation between changes in the studied parameters and the localization of anomalies (left-sided, right-sided). Indicators of the angle of the lower jaw are significantly altered from the opposite direction of its displacement. The change in the angles of inclination of the canine and the first permanent molars, as occlusive compensation, is determined reliably. The more the angle of the mandible changes, the more the lower jaw moves in the transversal direction. Perhaps this is due to the asymmetric tone of masticatory muscles.