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The effect of mechanical trauma on the tooth germ of rat molars at various developmental stages: a histopathological study
Author(s) -
Taniguchi K.,
Okamura K.,
Hayashi M.,
Funakoshi T.,
Motokawa W.
Publication year - 1999
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/j.1600-9657.1999.tb00743.x
Subject(s) - enamel paint , sequela , molar , ankylosis , ameloblast , dentistry , enamel organ , tooth eruption , developmental stage , anatomy , medicine , surgery , psychology , developmental psychology
— Intrusive trauma was experimentally applied to the tooth germ at different developmental stages in the rat first molar. The tooth germ at the earliest (postnatal day 1, initiating stage of enamel matrix formation) and the latest (postnatal day 10, calcifying stage of preformed enamcl matrix) developmental stages studied showed localized enamel hypoplasia as a direct sequela of trauma. Thc tooth germs in which enamel matrix was rapidly thickening (postnatal days 3, 5, 7) and had not yet started to calcify showed the most intense and extensive injuries to the formation and structural organization of both enamel and dentin. As for indirect effects secondary to trauma, tooth germ dislocation was observed chiefly in tooth germs at the same developmental stages, frequently resulting in ankylosis. The present experimental model may be helpful for clarifying thc histogenesis of traumatic changes in the developing tooth germ.