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PubMedDate not supplied

Observation of a child with multiple submerged primary teeth.

The authors presented a case report of a seven-year-old male with eight submerged primary molars and a primary lateral incisor. Two major treatment modalities, tooth extraction and observation, were reported. In this case we applied the two alternative modalities and observed the patient for five years. The permanent successors were in the process of almost normal eruption after the extraction of the submerged primary teeth; no eruption and more severe submerging were observed, however, in the permanent successors of the submerged primary teeth that were not extracted. These results suggest that submerged or impacted primary teeth should be extracted immediately when they are moderately or severely submerged.

Anodontia↗
PubMed1985

Differential termination times of enamel formation on human deciduous anterior-tooth surfaces revealed by tetracycline labelling.

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 than on the distal surface in 18 instances and, nearly simultaneously on both of these surfaces in four, (2) ended earlier on the distal than on the labial surface in all 28 specimens and (3) ended earlier on the labial than on the lingual surface in 14 instances and nearly simultaneously on both of these surfaces in eight instances.

Amelogenesis↗
PubMed1986

Innervation of the dental pulp during tooth succession in the cat.

The possibility that axons branch to supply the pulps of both the upper deciduous canine tooth and its permanent successor has been investigated by stimulating the pulp of one tooth and recording from the pulp of the other. In cats less than about 14 weeks of age, the permanent canine was too poorly developed to allow electrodes to be applied to it satisfactorily. In 5 of 14 preparations in cats aged 14-23 weeks, compound action potentials were recorded in one canine during stimulation of the other. These responses were not abolished by sectioning the infraorbital nerve or its canine branch in the floor of the orbit or by paralysing the animal, but they were abolished by sectioning the pulp of the permanent canine, indicating that they were due to branched axons. In preparations in which there was no tooth-to-tooth response, there was usually evidence that the pulp of one or other of the teeth did not have a functional innervation. The results indicate that at least some of the nerves which supply the pulp of a deciduous tooth are retained to supply its permanent successor.

Aging↗
PubMed1983

Granular cells associated with the enamel organ of a developing tooth.

An accumulation of granular cells associated with the enamel organ of a developing deciduous, incisor tooth was noted during light microscopy (LM) of serial sections from the right half of a mandible from a stillborn, female infant of 37 weeks gestations. There was a break in continuity of the enamel matrix associated with the focus of granular cells, which appeared to be continuous with, and arise directly from, the cells of the stratum intermedium. The granular cells were very similar histologically to those of a congenital epulis but it is impossible to say whether the lesion would have developed sufficiently to present clinically as an epulis. Less probably, the granular cells might eventually have been associated with the subsequent development of a granular cell ameloblastoma or ameloblastic fibroma. If the lesion does represent an early stage in the formation of a congenital epulis, it would support the odontogenic theory of origin of the granular cells.

Cytoplasmic Granules↗
PubMed1979

The effect of prenatal factors on crown dimensions.

As shown in 870 white participants in the National Collaborative Perinatal Project (NCPP), maternal health status during pregnancy and birth size are systematically related to mesiodistal and buccolingual crown dimensions of I1, I2, dc, dm1, dm2 and M1. Maternal diabetes, maternal hypothyroidism and large size at birth are associated with larger maxillary and mandibular teeth in white children. Conversely, deciduous and permanent crown diameters are diminished in maternal hypertension, and in low birthweight and small birth-length conditions. These findings suggest that maternal and fetal (or gestational) determinants of both deciduous and permanent tooth crown dimensions may account for as much as half of crown-size variability with major implications to population comparisons and historical odontometric differences and trends.

Birth Weight↗
PubMed1991

[A study of root resorption of deciduous teeth in dogs. Influence of successional tooth germ and occlusal force].

The role of successional tooth germ and occlusal force in root resorption of mandibular second deciduous molars was studied in 24 beagle dogs by means of radiographic and histologic evaluations. 70 days after birth their mandibular right third permanent premolar germs were surgically removed, and in 10 of the dogs the maxillary right and left second deciduous molars were extracted to decrease the occlusal force on the mandibular second deciduous molars. 1) When successional tooth germs were present, whether the occlusal force was normal or decreased, the alveolar bone and deciduous tooth adjacent to the tooth germ were resorbed, accompanied by eruption of the permanent tooth. After the resorption of the deciduous tooth reached half of the root, many odontoclasts were observed in the dental pulp of the deciduous tooth. The root resorption was hastened by internal resorption. 2) When successional tooth germs were removed, whether the occlusal force was normal or decreased, the root resorption was delayed. The resorption from the root surface progressed very slowly, but shortly after this resorption reached the pulp, internal resorption occurred and the deciduous tooth was resorbed in short time. 3) When the occlusal force was decreased, in the deciduous teeth in which successional tooth germs were present, the tooth resorption tended to delay to a later time. However in the deciduous teeth from which the successional tooth germs were removed, the processes of tooth resorption was very different in individuals, the difference between tooth resorption in normal occlusal force and in decreased occlusal force was not clear. 4) In all groups, shallow resorption on the deciduous root surface was observed before the successional tooth started to erupt, and this resorption was apart from the tooth germ. By repeating resorptive periods and resting periods, this resorption progressed according to the increase in age, and in the resting period, resorption was repaired by new deposits of cementum.

Animals↗