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At least 37 records · Page 2Linked to original sources
PubMed1975

A note on the variation in the timing of deciduous tooth eruption.

A survey was carried out on the timing of deciduous tooth eruption based upon 3600 Caucasian children in three heterogeneous samples from Birmingham, Sheffield and Gloucester and a small more or less homogeneous sample from Biddulph (North Staffordshire). These data were compared with the eruption times derived from a sample of 600 British Negro children. Generally, the deciduous teeth of Negroes erupted before those of Caucasians, although the actual eruption times in each sample exhibited a greater degree of variability than is appreciated by most dental workers.

Age Factors↗
PubMedDate not supplied

Deciduous tooth chronology in the mandible of the domestic pig.

Fetuses of known age, collected from 20 days' gestation to term, were used to characterize the chronology of deciduous tooth development within the right mandible of swine. Tooth development was first observed at 32 days' embryonic development, with the differentiation of the deciduous third molar. Bud stages for the remaining deciduous teeth differentiated within the period of 32 to 38 days of embryonic development. Although the initial histological appearance of these teeth covered a short period of time, it was apparent that each tooth continued to develop at its own rate. The deciduous second incisor and first molar reached a stage of enamel formation by the 80th and 86th day of fetal development. This is a much later stage than previously recorded for beginning enamel formation. The stages of tooth development and enamel formation for each tooth are summarized. A previous report on the distribution of the dental lamina and deciduous tooth development in the mandible of the domestic pig combined with the information presented in this report on tooth chronology provide much of the information required for future studies using the domestic pig in dental research. A fetus observed at the 74th day of development demonstrated a tooth bud for the deciduous first premolar. The development of this tooth was followed closely throughout the remainder of fetal development with the cap stage representing its most definitive form at 110 days' development. The suggested deciduous origin for this tooth could result in a reevaluation of the nomenclature for the dental formula of swine.

Animals↗
PubMed1979

[Delayed eruption of the premolar after pathological deciduous tooth root resorption].

The behaviour of eruption of lower premolars after pathological resorption of deciduous molar roots was examined on models and X-rays. The molars of the first dentition were shed earlier after pathological resorption of deciduous molar roots. Data of absence are measured in years in the presence of occlusal bone bridges. The middle values are more than three years. Eruption of permanent teeth happens years later or they remain impacted. Eruption dates of premolars after pathological deciduous root resorption and interruption of the lamina dura, and after physiological resorption are significantly earlier than if there is an occlusal bony bridge (p less than 0.01). The therapeutic consequence is the surgical liberation of such premolars and their removal.

Alveolar Process↗
PubMed1992

Deciduous tooth size standards for American blacks.

Normative standards for tooth sizes are valuable for assessing a given patient's status, both clinically and for evaluating intrinsic (e.g., genetic, chromosomal aberrations) and acquired conditions. There are, however, very few published standards for American Blacks and none for the deciduous teeth. Mesiodistal and buccolingual crown diameters are reported here for a series of 100 Black children. As with the permanent dentition, the primary teeth of Blacks are appreciably larger than Whites, though the amount differs by tooth type. In general, while all teeth are larger than norms for Whites, the posterior teeth (m1, m2) are preferentially larger. Applications of these standards are discussed.

Black People↗
PubMed1976

[Light microscopic presentation of the morphological behavior of the nerves of deciduous teeth during tooth exfoliation deciduous and after loss of the dentition].

Structural changes in the nerve can hardly be demonstrated in nerve sections located intradentally, i.e. away from the area of tooth resorption. pseudohypersegmentation, however, is found intradentally in nerve sections of the radical pulp close to the resorption area. Serious lesions of the nervous substance are found extradentally, in the direct neighborhood of the erupting permanent tooth. If the deciduous tooth was lost more than 12 months ago, intraosseously the final stage of physiological degeneration is reached.

Child↗
PubMed2026

Characterization of stem cells from exfoliated deciduous teeth from a patient with Alagille syndrome carrying a JAG1 mutation.

PURPOSE: Alagille syndrome (ALGS) is an autosomal dominantly inherited disorder primarily caused by mutations in the Jagged Canonical Notch Ligand 1 (JAG1) gene. Although many pluripotent stem cells are well established, no patient-derived stem cells from exfoliated deciduous teeth (SHED) have been developed. In this study, we aimed to establish SHED from an ALGS patient carrying a heterozygous JAG1mut mutation. METHODS: We isolated SHED from a deciduous tooth of an ALGS patient with a heterozygous JAG1 mutation (ALGS-SHED) by the colony-forming unit-fibroblast (CFU-F) method. We then compared the characteristics of ALGS-SHED and healthy donor-derived control SHED (CONT-SHED). RESULTS: ALGS-SHED displayed mesenchymal stem cell features as indicated by CFU-F formation, immunophenotype, and mesenchymal multipotency into adipocytes, chondrocytes, and osteoblasts. ALGS-SHED showed reduced population doubling capacity and exhibited induced chondrogenic potency and diminished osteogenic potency, but similar hepatic potency. ALGS-SHED damaged in situ potency to form bile duct-like tubular structures in the livers of chronically CCl4-injured mice. CONCLUSIONS: We successfully established ALGS-SHED from an ALGS patient carrying a heterozygous JAG1 mutation. Our established ALGS-SHED may represent a potential model for studying ALGS involving a JAG1 mutation.

Alagille Syndrome↗
PubMed1979

Fetal alcohol syndrome.

A case of fetal alcohol syndrome in an 8-month-old infant is presented. Several of the maxillofacial anomalies associated with this syndrome were present. In addition, a large dentigerous cyst was found, a rare lesion occurring with a deciduous tooth and never before reported in association with fetal alcohol syndrome.

Dentigerous Cyst↗
PubMed1975

[Root fragments of deciduous teeth remaining in the alveolar bone. Microradiographic and ultrastructural study].

Deciduous tooth fragments retained in the alveolar bone can be either unresorbed portions of root, or root splinters of various sizes resulting from a fracture. The composition and ultrastructure of the fragment dentine remain unchanged even after a long period of inclusion; any specific alterations present at the time of inclusion persist. Some fracture surfaces and resorption lacunae of completely embedded fragments are covered with newly-formed cementum, usually in continuity with the preexisting cementum. Osteo-dentinal ankylosis occurs on certain resorption surfaces. The ultrastructure of the ankylosis zones is characterized by the continuity of the collagenous fibrillar framework of the dentine and that of the newly-formed bone, and by the penetration of bone substance into the dentinal tubuli and the pulp canals.

Adolescent↗
PubMed1978

Canadian Eskimo permanent tooth emergence timing.

To identify the times of emergence of the permanent teeth of Canadian Eskimos (Inuit), 368 children and adolescents were examined. The presence or absence of all permanent teeth except the third molars was recorded and these data subjected to probit analysis. Female emergence times were advanced over males. Generally, the Inuit of both sexes showed statistically significant earlier emergence times than Montreal children, except for the incisors. The present results do not support hypotheses indicating that premature extraction of the deciduous teeth advances the emergence of their succedaneous counterparts. There is some indication the controls of deciduous tooth emergence continue to play some part in emergence of the permanent dentition, especially the first permanent teeth that emerge.

Asian People↗
PubMed1976

The secretory ameloblast of the mini-pig foetus: Morphology, and effect on morphology of various aldehydes and of delayed fixation.

Electron microscopic investigations of secretory ameloblasts from deciduous tooth germs of mini-pig foetuses and investigations of the ability of various fixatives to preserve these cells in tooth germs immersion-fixed in to 5 min, 10 min, 15 min, 20 min and 40 min after death of the mother gave the following results: 1. The ameloblasts exhibit ultrastructural characteristics typical of exocrine secretory cells of merocrine type. 2. The localization of organelles is as in rodent secretory ameloblasts, but differs from the location in the human analogues. 3. Fixation with 4% formaldehyde invariably gives unacceptable ameloblast preservation. 4. Fixation with 2.5% glutaraldehyde gives fair preservation of the ameloblasts when the germs are fixed within 10 min of the death of the mother. 5. Fixation with a fixative mixture 2% formaldehyde-1.25% glutaraldehyde gives good preservation when the ameloblasts are fixed within 15 min of the death of the mother. 6. Fixation with a fixative mixture 2% formaldehyde-1% glutaraldehyde-1% acrolein gives good ameloblast preservation when the germs are fixed within 15 min of the death of the mother.

Acrolein↗