Restoration of defects in hard dental tissues is one of the most pressing problems in modern dentistry. The use of composite restorations on occlusal surfaces subject to load is limited due to the low physical and mechanical characteristics of these materials (Radlinsky S.V., 1996, 1997; Fusayama T., 1990; Liebenberg W.H., 1996). A highly effective restoration method is the restoration of chewing teeth with biocompatible and aesthetic ceramic inlays (Arutyunov S.D., 1997, Holand W., 1998; Leinsinger M., 1998; Ubassi G., 2000). Advances in adhesive dentistry have led to more frequent use of indirect restorations. In some of them, indirect restoration methods are more advantageous than direct composite embedding methods, for example, to create logical occlusal and interproximal anatomy, reduce shrinkage stress during polymerization and increase the degree of conversion (Lu P.Y., 2018; Chiang Y.S. 2018). One of the main problems of world dentistry is caries and its occurrence, leading to the destruction of the crown part of the tooth. (Rubnikovich, S.P., 2013; Elovikova, T.M., 2017). Restoration of the crown part of a destroyed tooth is a complex, fragile part and has great preventive value. Underestimation of this importance leads to inappropriate removal of the left tooth, which often leads to deformation of the dental arches (Komlev, S.S., 2015; Oganyan A.I., Grigoryan M.M. 2018) Inlays and onlays not only represent an alternative to metal-oxramic crowns, but also allow the restoration of the chewing function of the tooth, influencing the flexibility of the tubercles and the pliability of the material, which are key parameters for the functioning of the tooth-restoration complex (Douglas W.H., 1996; Dietschî, D., 1997).