[Supercomplect retained tooth is the cause of delayed eruption of the upper central left incisor. Therapy].

Supercomplect retained tooth, a mechanical obstruction preventing the eruption of 21st tooth, is the cause of delayed eruption of the upper central left incisor. After removal of the supercomplect retained tooth, extension of the upper dental arch, normalization of occlusion, and creation of space for 21st tooth in the dental row, A. Ya. Kats' method was used, based on surface and deep functional stimulation of the periodontium, which led to eruption of the 21st tooth.