STEYNTONA — KAPDEPONA THE SYNDROME (Gh. W. Stainton, 1839 — 1906, amer. stomatologist; Century of Capdepont, 1867 — 1918, fr. stomatologist; syndrome; synonym: odontogenesis imperfecta, odontopathia mesodermo-ectodermalis, opalescent dentine, Steynton's syndrome, Kapdepon's dysplasia) — genetically caused malformation and structures of tissues of teeth which is characterized by discoloration of crowns of teeth, the increased fragility of roots, an early obliteration of cavities of teeth and decrease in electroexcitability of a pulp. Steyntonom and in 1905 is described by Kapdeponom in 1892. It is observed equally often at men and women. Both temporary, and second teeth are surprised. The etiology and a pathogeny are unknown.
Teeth at S. — To. pages are cut through in usual terms, color of enamel from bluish-gray to dark brown, sometimes with pearly luster. Soon after a teething enamel begins to be chopped off, teeth become transparent (amber), naked dentine accepts more and more dark coloring from light yellow to brown, such teeth are quickly erased to a gingiva. The erased teeth are usually insensitive to external influences and quite often have the lowered electroexcitability; polostp teeth and channels of fangs are early obliterated. On roentgenograms, in addition to an obliteration of cavities of teeth, also the changes of roots (shortened, reinforced or thin), and at tops of roots nek-ry (or many) teeth — the centers of destruction of a bone tissue sometimes come to light.
At gistol. research teeth (see) in enamel wider come to light, in comparison with norm, interprismatic spaces, and is closer to the surface of enamel — a resorption and disintegration of enamel columns. The number of dentinal tubules towards a pulp sharply decreases, they gyrose, different diameter. The zone of predentin quite often is absent. The layer of fibrilloblasts is thinned, many cells are deprived of shoots. On the surface of fangs excessive development of cement is observed.
For the prevention of dental abrasion it is recommended to cover them with artificial crowns; at considerable dental abrasion carry out orthopedic treatment for the purpose of recovery of dentitions (see. Dentures ).
Bibliography: Bohr E. V., etc. Therapeutic stomatology, M., 1982; In i x 1 e of D. Heritable disorders affecting dentin, in book: Oral facial genetics, ed. by B. E. Stewart a. G. H. Prescott, p. 227, St Louis, 1976; With a p d e-p o n t C. Dystrophie dentaire non encore decrite yo type of her£ditaire et familial, Rev. Stomat. (Paris), t. 12, p. 550, 1905; Stainton C. W. Crownless teeth, Dent. Cosmos, v. 24, p. 978, 1892 *
Yu. M. Maksimovsky, L. P. Ruby.