title: [Effect of experimentally induced trauma to the incisors in rats].
abstract: The purpose of this study was to produce developmental lesions of enamel in rats by a quick and simple method and to examine the enamel hypoplasia caused by trauma. 4-day-old and 3-week-old Wistar rats were used. Trauma was produced by needle pricking and hitting on the mandibula. After one week incisors were removed together with jaws and prepared for microradiography, X-ray diffraction, light microscope and transmission electron microscope examination. Microradiographic findings in the needle pricking group revealed hypocalcified and hypoplastic enamel. The incidence was 73.7%. In the hitting group of 4-day-old rats the incidence was lower, 70.0%. Microradiographic findings in this group were diffuse hypoplasia in the surface enamel. Hitting of 3-week-old rats produced no enamel hypoplasia. Crystallinity of hypoplastic enamel was reduced in both a-axis and c-axis direction. Histological findings in 4-day-old rats revealed disarranged and detached ameloblasts at location trauma. These results indicate that a needle pricking method involving secretory stage ameloblasts of 4-day-old rat incisors can induce a considerable amount of enamel hypoplasia.
authors.affiliation: Semmelweis Egyetem, Fogorvostudományi Kar, Gyermekfogászati és Fogszabályozási Klinika, Budapest.
authors.forename: I
authors.initials: I
authors.lastname: Tarján
authors.forename: N
authors.initials: N
authors.lastname: Rózsa
authors.forename: S
authors.initials: S
authors.lastname: Tanase
authors.forename: W
authors.initials: W
authors.lastname: Noriko
authors.forename: T
authors.initials: T
authors.lastname: Yoshidai
mesh_terms: D000565:Ameloblasts / Q000473:pathology*; D000818:Animals; D003744:Dental Enamel Hypoplasia / Q000209:etiology / Q000473:pathology*; D004195:Disease Models, Animal; D015994:Incidence; D007180:Incisor / Q000293:injuries* / Q000473:pathology*; D008297:Male; D008334:Mandible; D051381:Rats; D017208:Rats, Wistar; D018677:Tooth Injuries / Q000473:pathology*