POPOVA PHENOMENON

From Big Medical Encyclopedia

POPOVA PHENOMENON (V. O. Popov, the domestic doctor) — the dentoalveolar deformation consisting in the shift (promotion) of teeth in the direction of the absent antagonists. For the first time this phenomenon was described in 1880 by O. Popov. In 1904 Mr. Godon (S. of Godon) observed deformation of dentitions in connection with partial loss of teeth. Therefore this phenomenon is often called Popov's phenomenon — Godona.

Distinguish two forms of this dentoalveolar deformation; at one form at the moved-forward teeth the neck is not bared, at another — the neck and partially cement of a root are bared. Sometimes the teeth deprived of antagonists move forward so that the crowns almost touch a mucous membrane of an alveolar shoot of an opposite jaw. At the same time there is a blocking of chewing movements of a mandible.

Gistol, researches of teeth and peridental fabrics showed that at P. f. there is a reorganization of a bone of tooth sockets at the teeth deprived of antagonists: the periodontal crack is narrowed, the direction of bunches of collagenic fibers changes periodontium (see). At the same time in a pulp of these teeth a number of dystrophic changes is observed.

Item f. is an obstacle at prosthetics. For P.'s elimination f. apply special to lay down. orthodontic devices (see. Orthodontic methods of treatment ), which design as removable or fixed prostheses. With their help occlusion joins the teeth deprived of antagonists at simultaneous dissociation of other teeth. It leads to gradual alignment of dentitions. At big promotion of teeth they are devitalized and shortened within an occlusal curve (see. Bite ). At a considerable exposure of cement of the moved-forward tooth it is deleted.



Bibliography: Ponomareva V. A. Mechanism of development and ways of elimination of dentoalveolar deformations, M., 1974, bibliogr.; V. O. priests. Change of a shape of bones under the influence of abnormal mechanical conditions in the environment, a yew., SPb., 1880.


V. A. Ponomareva.

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