Journal of Volgograd State Medical UniversityJournal of Volgograd State Medical University1994-94801994-9499Volgograd State Medical University11950010.19163/1994-9480-2020-4(76)-62-64Research ArticleASSESSMENT OF THE INFLUENCE OF THE ORAL ENVIRONMENT ON THE STRENGTH OF ENDODONTIC CROWNS MADE OF HYBRID CERAMICS IN THE LABORATORYSevbitovA. VInstitute of dentistry E. V. Borovsky, Department propaedeutics of dental disesesavsevbitov@mail.ruDorofeevA. EInstitute of dentistry E. V. Borovsky, Department propaedeutics of dental diseses-ErshovK. AInstitute of dentistry E. V. Borovsky, Department propaedeutics of dental diseses-EninaYu. IInstitute of dentistry E. V. Borovsky, Department propaedeutics of dental diseses-KalinovskiyS. IDepartment of prosthetic dentistry and orthodontics with the course of propaedeutics of dental diseases-PustokhinaI. GInstitute of dentistry E. V. Borovsky, Department propaedeutics of dental diseses-FSAEI HE «I.M. Sechenov First Moscow State Medical Universitу» of the Ministry of Healthcare of the Russian Federation (Sechenov University)FSBEI HE «I.P. PavlovRyazan State Medical University» of the Ministry of Healthcare of the Russian Federation15042020174626418122022Copyright © 2020, Sevbitov A.V., Dorofeev A.E., Ershov K.A., Enina Y.I., Kalinovskiy S.I., Pustokhina I.G.2020A topical issue in dentistry is the problem of restoring teeth after endodontic treatment. There are many materials available to restore them. However, each of them has its own negative properties. The purpose of this work was to determine the degree of influence of the oral environment on the strength characteristics of endocrowns made of hybrid ceramics. 30 samples from hybrid ceramics were examined. One of the groups was confirmed by thermal Cycling, and the other was not. Further, both groups on the Instron-5982 device were subjected to vertical compression load before the destruction began. According to the results of this study, it can be noted that endocorns made of hybrid ceramics perfectly distribute the occlusal load and have good elasticity, but thermal Cycling has a negative impact on the strength characteristics of this material.hybrid ceramicsthermal cyclingindirect restorationendocrowndentistryгибридная керамикатермоциклированиенепрямая реставрацияэндокоронкастоматология[Енина Ю.И., Севбитов А.В., Дорофеев А.Е., Пустохина И.Г. Оценка качества краевого прилегания прямых и непрямых реставраций в цервикальной области зубов // Журнал научных статей Здоровье и образование в XXI веке / - 2019. - Т. 21, № 6. - С. 27-30][Мишин Д.Н., Митин Н.Е., Олейников А.А., Попова В.О. / Оценка величины конусности препарирования естественных зубов под искусственные металлокерамические коронки // Научные ведомости Белгородского государственного университета. Серия: Медицина. Фармация / - 2019. - Т. 42, № 4. - С. 451-458][Enina Yu.I., Sevbitov A.V., Dorofeev A.E., Pustokhina I.G. Experimental substantiation of the choice of the restoration method in the cervical area of teeth with abfraction defects // International Journal of Mechanical Engineering and Technology. - 2019. - Vol. 10. -No. 5. - P. 41-47.][Hampe R., Theelke B., LQmkemann N., et al. Fracture toughness analysis of ceramic and resin composite CAD/CAM material // Operative Dentistry. - 2019. - Vol. 44 (4). -P. 190-201.][Nouh I., Kern M., Sabet A.E., et al. Mechanical behavior of posterior all-ceramic hybrid-abutment-crowns versus hybrid-abutments with separate crowns-A laboratory study // Clinical Oral Implants Research. - 2019. -Vol. 30 (1). - P. 90-98.][Pavlov A.A., Yumashev A.V., Utyuzh A.S., et al. Hybrid ceramic preparation for silanization // International Dental Journal. - 2017. - Vol. 67, no. S1. - P. 82.][Sevbitov A.V., Enina Y.I., Dorofeev A.E., et al. Experience in the application of hybrid ceramic restorations in the cervical region // Asian Journal of Pharmaceutics. - 2018. - Vol. 12, no. 3. - P. 1106-1109.][Sevbitov A.V., Enina Yu.I., Derevyanchenko S.P., Dorofeev A.E. Comparative evaluation of effectiveness of restorations in cervical teeth region by direct and indirect method // International Journal of Civil Engineering and Technology. - 2019. - Vol. 10, no. 3. - P. 3099-3105.][Sevbitov A.V., Enina Yu.I., Dorofeev A.E., et al. Study of the impact of various abrasive factors on the microrelief of the surface of hybrid ceramic orthopedic structures // Opcion. - 2019. - Vol. 35, no. S24. - P. 598-611.][Steinbrenner H. Multichromatic and highly translucent hybrid ceramic Vita Enamic // International Journal of Computerized Dentistry. - 2018. - Vol. 21 (3). -P. 239-250.]