Tadahiro Ooë

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Serial sections of pre- and postnatal human jaws were examined to document the development of the first and second permanent molars and related dental laminae. The results are summarized as follows: 1. The first permanent molar develops as an epithelial thickening on the distal extension of the dental lamina in the 100–110 mm fetus, reaches the capstage in(More)
Human teeth are diphyodont excepting the permanent molars. The deciduous teeth are, ontogenetically considered, the first generation of teeth. The permanent teeth (except molars) belong to the second dentition. The term " third dentition " (also called the postpermanent dentition) refers to the opinion that one more set of teeth can occur in addition to the(More)
The positional relationships between the cervical-enamel margin and the intersecting point of a fluorescent (tetracycline) line in dentine, with the outer dentine surface or the dentine-enamel junction, were investigated by ultraviolet microscopy of the human deciduous anterior teeth. The results suggest that enamel formation (1) ended earlier on the mesial(More)
Up to the cap-stage the lateral enamel strand extends from the dental lamina to the tip of the tongue-like projection of the enamel organ, forming there a swelling. It does not reach the free margin of the enamel organ at the bell-stage. The lateral enamel strand gradually becomes smaller in regard to the tooth germ, changing its relative position to the(More)
In 3 out of 167 human jaws which were serially sectioned, fused tooth germs were found. The first case involved fusion of the central and lateral incisor germs in the left maxillary jaw (7th foetal month). The second case involved fusion of the central and lateral incisor germs in the left mandibular jaw (6th foetal month). The third case involved fusion of(More)
In 3 out of 167 human jaws which were cut in serial sections a supernumerary tooth germ was found. The first case is a supernumerary incisor germ in the maxillary jaw in a human foetus of the 8th month. The second case is a supernumerary incisor germ in the maxillary jaw in a foetus of the 3rd month. The third case is a supernumerary tooth germ between the(More)
The pattern of labelling of the interradicular dentine that forms the floor of the pulp chamber was studied in human deciduous second mandibular molars from patients who had undergone treatment with tetracycline during the period of formation of those teeth. Six teeth exhibited isolated mineralization centres for the interradicular dentine, indicating that(More)