Ameloblasts
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Efeito da radiação ionizante na formação da matriz organica do esmalte dentario / Effect of ionizing radiation in dental enamel organic matrix formation
The aim of this study was to evaluate the dental eruption rate, the organic enamel matrix birefringence, the odontogenic tissue morphology and the ultrastructure of secretory ameloblasts in incisor of rats submitted to high radiation doses. For this purpose, sixty male rats were used, the first thirty divided into three experimental groups: Control, 15Gy and
Publicado em: 2009
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2. Ultrastructural and immunohistochemical study of the influence of fluoride excess on the development of rat incisor tooth buds
Little information is available on the pathogenesis of fluorosis during the fetal and initial postnatal period. In the present study, female rats received 0 (control), 7 or 100 ppm of sodium fluoride in drinking water, one week before breeding and throughout gestation and nursing periods. The hemimandibles of the offspring were collected at 0, 7 and 14 days
Journal of Applied Oral Science. Publicado em: 2007-08
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3. Desenvolvimento osseo e dentario : aspectos biologicos, bioquimicos e moleculares da remodelação da matriz extracelular regulada pelas metaloproteinases de matriz e seus inibidores / Dental and bone development : biology, biochemistry, and molecular aspects of the matrix metalloproteinases and their inhibitors during extracellular matrix remodeling
Our objective was to analyse the spatial-temporal distribution of MMP-2, MMP-9, TIMP-1, TIMP-2 and RECK during development of mineralized tissue (bone, enamel, and dentine) in embryos, newborn, and adult mice by immunohistochemistry and in situ hybridization. During rat amelogenesis, at the secretion phase, MMPs and RECK were immunostained in the ameloblast
Publicado em: 2007
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4. Estudo morfológico ultraestrutural e imuno-histoquímico da influência do excesso de flúor no desenvolvimento do germe dental de incisivo de rato / Morphological ultrastructural and immunohistochemical study of the fluorine excess influence on rat incisor tooth germ development
The dental fluorosis is a result of fluorine toxicity during odontogenesis. Several experimental models have been used in attempt to explain the fluorine pathogenesis in enamel, but during the fetal or the initial postnatal period, there is not much information about its action. For this reason, in this research, the female rats received 0, 7 or 100 ppm of s
Publicado em: 2006
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5. Mineralização do esmalte apos a remoção parcial dos ameloblastos pos-secretorios em incisivos inferiores de ratos / Enamel mineralization after partial removal of post-secretory ameloblasts in the rat lower incisors
The enamel organ of rat incisors at the maturation stage of amelogenesis (from the region were enamel rods are visible and the enamel is completely acid-soluble) was removed and the limits of the removal (surgical region) were marked by notches made at the labial face of the enamel. The enamel organ, from the incisal notch up to the alveolar crest, was damag
Publicado em: 2005
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6. Efeitos da ingestão do alcool durante a gestação na imunoexpressão do EGF na amelogenese e dentinogenese do 1º molar inferior de ratos
Previous studies have reported that the maternal exposure to alcohol reduces the maxilo-fadal development, including a delay in the formation and eruption of the tooth, as well as, enamel anomalies. The mechanisms of these deleterious effects are not fully clarified. The objective of this study was to analyze using polyclonal antibody of the Epidermal Growth
Publicado em: 2004
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7. Distribution of biglycan and decorin in rat dental tissue
Biglycan and decorin are small leucine-rich proteoglycans that play several biological and structural roles in different tissues and organs. Several reports have indicated that biglycan participates in odontoblast and ameloblast differentiation and in the calcification process. In the present study we show that the expression of biglycan changes from within
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-08
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8. O desenvolvimento do processo inflamatorio no tecido gengival de rato
The dynamic and composition of the gingival fluid has been studied by various authors, but little is known about the vessels involved in its formation during the junctional epithelium organization. This study describes the gingival inflammatory process, especially the increased vascular permeability, during the development of the gingiva of rats. Rats, 19 to
Publicado em: 1981
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9. Morphology and function of maturation ameloblasts in kitten tooth germs.
In order to clarify the morphology and function of maturation ameloblasts, kitten tooth germs were examined using an ultrastructural tracer technique. Kitten maturation ameloblasts were divided into two cell types: a ruffle-ended type showing plasma membrane infoldings and invaginations at the distal cell surface and a smooth-ended type showing a non-invagin
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10. Development of the distal end and Tomes' processes of ameloblasts observed by freeze-fracture and ultrathin section electron microscopy.
A freeze-fracture examination of distal portions of differentiating and secretory ameloblasts was carried out using upper molar tooth germs from one to four days old rats. Ultrathin sections were prepared for comparison. Freeze-fracture provides a unique opportunity to observe plasma membrane events in distal portions of ameloblasts during differentiation an
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11. Scanning electron microscopy of the lateral cell surfaces of rat incisor ameloblasts.
Dry dissected rat incisor ameloblasts studied in the scanning electron microscope show remarkable specializations of their lateral surfaces. Four or five cycles of a change from a surface with longitudinal gutterlike folds associated with large intercellular spaces, to one with microvilli and reduced intercellular spaces, are found along the length of the lo
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12. Critical Role of Heparin Binding Domains of Ameloblastin for Dental Epithelium Cell Adhesion and Ameloblastoma Proliferation*
AMBN (ameloblastin) is an enamel matrix protein that regulates cell adhesion, proliferation, and differentiation of ameloblasts. In AMBN-deficient mice, ameloblasts are detached from the enamel matrix, continue to proliferate, and form a multiple cell layer; often, odontogenic tumors develop in the maxilla with age. However, the mechanism of AMBN functions i
American Society for Biochemistry and Molecular Biology.