The paper presents a brief description of engineering and scientific problems which arise at the steel plant PJSC "ArcelorMittal Kryvyi Rih" when organizing a repair workshop to fix industrial equipment. The attention is paid to innovative methods of repair process based on intelligent agents and Industry 4.0 principles.

Pathological abrasion of hard dental tissues is quite common and can lead to partial or complete destruction of the crown part of the tooth, followed by disturbances in the entire dent alveolar system. Such conditions are difficult to treat, since along with the aesthetic component, it is necessary to restore functional usefulness, which is not always possible to achieve in the long term. Currently, various methods are used in dentistry to restore the lost crown part in a decompensated form of pathological tooth abrasion based on the use of various types of pins and pin structures, which do not always allow achieving positive long-term results due to their failure and breakage during operation. In this regard, we carried out experimental studies of the strength characteristics of various types of pin stump structures. For this, 45 samples of stump pin structures were made for testing on a ZMGI 25DKP tensile testing machine. Experimental studies have shown the magnitude of the stress at which the destruction of the samples occurs. As a result of the study, information was obtained on the strength of stump pin structures made of various materials, which is of great importance in tooth-preserving technologies used to restore the destroyed crown part in a decompensated form of pathological tooth abrasion.

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Determining the centric occlusion and forming a prosthetic plane is a complex and time-consuming stage of prosthetics in conditions of reduced height of the lower facial part as a decompensated form of pathological teeth abrasion and completely absent dentition. In modern dentistry, there is a large number of techniques, methods and devices for determining and constructing a prosthetic plane and further determining the centric relation of the jaws. All of them require performing a lot of manipulations to obtain the final result. Errors often occur when determining the centric relations of the jaws, which can affect the quality of manufactured prostheses, their aesthetics and functionality. The purpose of the study is to improve the method of determining the central occlusion based on the use of the author-developed device. Materials and methods. To eliminate the shortcomings of the known methods and techniques for determining the prosthetic plane and the centric relation of the jaws, we developed and patented a device for taking a cast and simultaneous determining the prosthetic plane, as well as the method for subsequent manufacturing a silicone base with occlusal bite-blocks for determining the centric occlusion, which are presented in this article. Results. The practical application of the method that we developed for determining the centric occlusion based on the use of the author-developed device, identified its advantages as well as disadvantages of the traditional well-known method for determining the centric occlusion by wax bases with bite patterns. Conclusions. The use of the method that we offer for determining the prosthetic plane and the centric relation of the jaws at the stages of orthopedic treatment makes it possible to: significantly reduce the time for manufacturing the prostheses; determine the prosthetic plane simultaneously with taking the working impression in four directions; provide the possibility of more accurate determining the prosthetic plane simultaneously with taking the impression; achieve good fixation of the basis in the oral cavity; eliminate deformations of the basis in the oral cavity, simplify execution, reduce material costs in the manufacturing prostheses.