**5. Conclusions**

In general, the new restoration of the NCCL with the expansion of the cavity under the prosthetic inlay and the formation of the area of the gingival fold for the gum growth shows its viability. On the main volume of tooth materials, there are levels of strain parameters comparable to the tooth without taking into account the lesion. It is required to study the influence of the cavity geometry for the prosthetic construction and the veneer part of the inlay to eliminate local zones of the maximum level of stresses and strains in the biomechanical assembly. The problem of frictional contact interaction in the region of the tooth-inlay interface with the refinement of the finite element model should be extended.

It is established that the material of the Herculite XRV inlay (Kerr Corp, Orange, CA, USA) in this formulation of the problem delivers a favorable strain state to the biomechanical system. The nature and levels of the distribution of the stress values of the maximum and average level of the contact parameters of the interface zones and strain intensity are close to those of a tooth without taking into account the lesion. At the same time, the level of strain of the Herculite XRV inlay is comparable to the strains in the tooth enamel, which can adversely affect the service life of the structure.

The results obtained in this article reflect the qualitative patterns of tooth deformation behavior. Accounting for the root system and its rationalization is required for quantification.
