Перегляд за Автор "Hasiuk, Petro A."
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Документ Comparative evaluation of histotoxicity indicators of metal alloys for the manufacture of metal ceramic dental constructions(Aluna Publishing, 2021-09) Hasiuk, Petro A.; Ramus, Mykhailo; Vorobets, Anna; Tkachenko, Iryna; Dzetsiukh, Tetiana; Kalashnikov, Dmytro; Rosolovska, Svitlana; Гасюк, Петро Анатолійович; Рамусь, Михайло Олександрович; Калашніков, Дмитро Вікторович; Ткаченко, Ірина МихайлівнаThe aim: To carry out a comparative assessment of metal alloys for the manufacture of metal-ceramic constructions of dentures by determining the indicator of their histotoxicity. Materials and methods: To identify the effect of metal alloys on cobalt and nickel bases on the tissue of organism, we carried out an experimental-morphological study of standard samples of metal alloys “Shot-alloy”, “Remanium-2000”, “Cerium”, “Dent-NCB”, “Cellite-N”. Results: A careful histological analysis of the capsules formed around the metal alloy samples during two periods of the experiment showed that the healing time of the subcutaneous tissue was not the same. The most complete healing, that is, the formation of mature fibrous connective tissue, occurred during the implantation of the cobalt based alloy “Remanium-2000” and the capsule formed at the end of the experiment around the implanted sample from the “Shot-alloy” alloy, and during the implantation of the “Cerium” alloy, healing the wound surface and the formation of a connective tissue capsule occurs fully than in previous cases. Conclusions: The analysis of the performed experiment testifies in favor of the point of view that the speed and quality of healing of damaged subcutaneous tissue upon the introduction of implanted research alloys depend largely on the individual chemical components that make up the alloys, or on their combination.Документ Mineralization of teeth enamel after eruption(ALUNA Publishing House, 2021) Kostyrenko, Oleksij P.; Vynnyk, Nataliia I.; Koptev, Mykhailo M.; Hasiuk, Petro A.; Skrypnyk, Maksym I.; Bilous, Alevtyna M.; Proskurnya, Serhii A.; Костиренко, Олексій Петрович; Винник, Наталія Іванівна; Коптев, Михайло Миколайович; Гасюк, Петро Анатолійович; Скрипник, Максим Ігорович; Білоус, Алевтина Миколаївна; Проскурня, Сергій АнатолійовичThe aim: The paper was aimed at the study of the processes of mineralization of the enamel of the permanent tooth after its eruption. Materials and methods: To study the structure of the enamel of permanent teeth has been carried out using light and electron microscopy. The study of the process of the development of the primordia of the permanent teeth involved 10 culled puppies of 30-40 days of age. Microscopic, electron microscopic, immunohistochemical methods of research have been used to study the processes of histogenesis. Results: The studies show that in the postnatal period, the formation of the crown, externally covered with cuticular epithelium, marks the formation of the primordium of the permanent tooth at the follicle stage. After eruption of a tooth, different parts of its crown have three individual structural and functional barriers to enamel biomineralization. The frst one is provided by the cuticular epithelium of the pitted areas of the crown, which ensures fltering of the salivary fluid from the protein deposit in the form of a pellicle. The second barrier is defned on the lateral and cuspidate surfaces of the enamel, where the cuticle is erased or poorly expressed. The third structural and functional barrier of enamel biomineralization is located in the cervical portion of teeth of different classes. Conclusions: Different areas of the enamel in the tooth crown have specifc fltration barriers, which can be distinguished as follows: pit-and-fssure-and-groove, cuspidateand-approximal, and cervical barriers. The cuticle is poorly expressed or totally absent on the cusps of the tooth crowns in contrast to pitted areas.