The purpose of this work is to assess the influence, feasibility and effectiveness of glycerin as one of the means that prevent the formation of an oxygen-inhibited layer, to search for the most effective polymerization protocol for the final portion of the composite materialThe prepared carious cavities of the first class were sealed with a composite, then the samples were degreased and dried. Since the dental material is a dielectric material and is highly susceptible to charging under the influence of an electron beam, it was decided to apply a thin (30 nm) layer of platinum to the surface of the objects under study.Studies of the surface of the teeth and the applied composite were carried out using a scanning electron microscope (SEM) Tescan Vega 3 SBH.Based on the essence of the mechanism of formation of the oxygen-inhibited composite layer, polymerization protocols were selected. The samples were divided into 4 groups according to each protocol of finishing processing.Based on the study of the surface of composite restoration using a scanning electron microscope (SEM) Tescan Vega 3 SBH, it is concluded that the most optimal protocol for finishing the restoration is polymerization using means that prevent the formation of an oxygen-inhibited layer, and subsequent finishing treatment. This method allows you to achieve a smooth surface of the composite, the absence of pores and microcracks, high-quality edge fit.