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Traumatic injuries to enamel formation in rat incisors
Author(s) -
FREDÉN H.,
HEYDEN G.,
INGERVALL B.
Publication year - 1975
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1975.tb01191.x
Subject(s) - enamel paint , dentistry , dental enamel , orthodontics , incisor , medicine
– Twenty‐three fullgrown white male rats were fitted with an inclined plane on the mandibular incisors with consequent raising of the bite by 2.5 mm. After an observation period of between 1 and 30 d the animals were killed. In all cases traumatic injuries to the enamel organs were seen. The defects were mainly of four different types. Type 1 occurred in the early maturation zone of the enamel as a local defect with dedifferentiated ameloblasts. Vascular injury was moderate and deformation of the dentin was seen. After 30 d there was still a local defect of the enamel organ. Type 2 occurred apically to the maturation zone and caused a two‐layered ameloblastoma resembling a sandwich. Hemorrhages were common in the surrounding connective tissue, with accompanying appearance of phospholipids in the tissue. After 30 d some restitution of the enamel formation was seen. Type 3 was characterized by fractures of the dentin associated with total ameloblastic injury. Vascular necrosis was seen in the surrounding tissue. After 30 d a new ameloblastoma had developed in some areas. These three types appeared separately or combined. Type 4 occurred as a folding of newly formed apical dentin in areas without differentiated ameloblastoma and was seen in all of the experimental animals.