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embryology dentine

Alkan Ozer, Guohua Yuan, Guobin Yang, Feng Wang, Wentong Li, Yuan Yang, Feng Guo, Qingping Gao, Lisa Shoff, Zhi Chen, Isabel C Gay, Kevin J Donly, Mary MacDougall, Shuo Chen
Classic embryological studies have documented the inductive role of root dentin on adjacent periodontal ligament differentiation.  The biochemical composition of root dentin includes collagens and cleavage products of dentin sialophosphoprotein (DSPP), such as dentin sialoprotein (DSP).  The high abundance of DSP in root dentin prompted us to ask the question whether DSP or peptides derived thereof would serve as potent biological matrix components to induce periodontal progenitors to further differentiate into periodontal ligament cells...
2013: PloS One
Shannon Fisher, Tamara Franz-Odendaal
Current fossil, embryological and genetic data shed light on the evolution of the gene regulatory network (GRN) governing bone formation. The key proteins and genes involved in skeletogenesis are well accepted. We discuss when these essential components of the GRN evolved and propose that the Runx genes, master regulators of skeletogenesis, functioned in early cartilages well before they were co-opted to function in the making of bone. Two rounds of whole genome duplication, together with additional tandem gene duplications, created a genetic substrate for segregation of one GRN into several networks regulating the related tissues of cartilage, bone, enamel, and dentin...
August 2012: Current Opinion in Genetics & Development
Alicia Kohli, Stella M Pezzotto, Graciela Garcia, Leonor C Poletto
UNLABELLED: The embryological, structural and functional unit of the dentine-pulp complex shares the odontoblast, located in the border of the dentine pulp, with basal nuclei and organelles. The odontoblast process emerges from its apical pole. It is formed by microtubules, microfilaments and vesicles covered by membranes penetrating the dentinal tubules, isolated from the inter-tubular matrix, along the extent of the dentine. The objective of this study was to evaluate the efficacy of three staining techniques: hematoxylin-eosin, periodic acid-Schiff and Schmorl, by staining the process, from beginning to end, and compare the results with the erosion technique...
August 2011: Biocell: Official Journal of the Sociedades Latinoamericanas de Microscopía Electronica ... Et. Al
Minoru Wakita, Tsuneyuki Yamamoto, Takanori Domon, Shigeru Takahashi
No abstract text is available yet for this article.
January 2004: Clinical Calcium
Electron microscope and electron diffraction studies of developing embryonic bovine enamel have revealed the organization of the organic matrix and the inorganic crystals. The most recently deposited inorganic crystals located at the ameloblast-enamel junction are thin plates, approximately 1300 A long, 400 A wide, and 19 A thick. During maturation of the enamel, crystal growth occurs primarily by an increase in crystal thickness. Statistical analyses failed to show a significant change in either the width or the length of the crystals during the period of maturation studied...
December 1964: Journal of Cell Biology
No abstract text is available yet for this article.
1963: Acta Anatomica
Yang Chai, Harold C Slavkin
The prospects for tooth regeneration in the 21st century are compelling. Using the foundations of experimental embryology, developmental and molecular biology, the principles of biomimetics (the mimicking of biological processes), tooth regeneration is becoming a realistic possibility within the next few decades. The cellular, molecular, and developmental "rules" for tooth morphogenesis are rapidly being discovered. The knowledge gained from adult stem cell biology, especially associated with dentin, cartilage, and bone tissue regeneration, provides additional opportunities for eventual tooth organogenesis...
April 1, 2003: Microscopy Research and Technique
B K Berkovitz, M Maden, U Eriksson
Retinoids are important molecules in various aspects of embryological development. Here the distribution of cellular retinoic acid-binding protein I (CRABPI) was studied in the continuously growing incisor of adult rats using an affinity-purified rabbit polyclonal antibody. CRABPI was present throughout the presecretory and secretory ameloblast layer. The protein disappeared from that layer during its maturation phase. The adjacent dental mesenchyme of the developing pulp stained positively for CRABPI, especially in the layer immediately beneath the fully differentiated odontoblasts...
October 1993: Archives of Oral Biology
S J Zottoli, E A Seyfarth
Julia Barlow Platt was a comparative embryologist and neurobiologist who was primarily interested in segmentation of the head in vertebrates. She was born on September 14, 1857 in San Francisco, California. Platt grew up in Burlington, Vermont, attended the University of Vermont and began graduate studies at Harvard University. Her nine years as a graduate student were spent on two continents with some of the most influential comparative zoologists of the time. Platt's remarkable scientific accomplishments over a ten year period include a description of axial segmentation currently used in the staging of chick embryos and the first description of a separate anterior head segment in Squalus embryos...
1994: Brain, Behavior and Evolution
M Ulmansky, L Bodner, F Praetorius, J Lustmann
Brain heterotopia of the tongue is a rare, congenital malformation, probably not embryologically related to encephaloceles or to the so called "nasal gliomas." The progressive growth frequently noted confers to the lesion a tumor-like appearance and can raise a clinical suspicion of some rare neonatal neoplasia. The non-neoplastic nature of the lesion is well established, and the growth may well be due to the fact that heterotopic brain grows as rapidly as normal brain in the infant. Although local recurrence after incomplete resection has been reported, the clinical behavior of brain heterotopia of the tongue is benign...
September 1994: Journal of Oral and Maxillofacial Surgery
M Weinreb, Y Michaeli
The following hypothesis is proposed: The inner enamel epithelium influences all cells of the dental papilla very early during embryologic development--long before any morphologic changes due to histo-differentiation are noticeable. During normal odontogenesis, the epithelium acts as a second order inducer for the differentiation of odontoblasts and their subsequent production of dentin. Other mechanisms exist which can induce responding fibroblasts of the dental pulp to produce dentin or dentin-like tissue...
February 1984: Medical Hypotheses
J Géraudie
The features of the dermal skeleton of the pectoral fins of two Brachiopterygii, Polypterus senegalus and Calamoichthys calabaricus, have been studied by light and electron microscopy. The components studied are the ganoine-covered lepidotrichia segments and the distally located actinotrichia, the features of which are similar to those in teleosts. An irregular patch of ganoine susceptible to erosion by vascular canals lies on top of the cellular bone of the upper surface of the segment. It is separated from the stratified epidermis by an organic intermediate layer in place of the dermoepidermal interface...
May 1988: Anatomical Record
B K Hall
The three papers presented by Noden, Thorogood and Lumsden in this session encompassed the connective tissues as broadly defined, i.e. soft (fibrous) connective tissue, cartilage, bone, muscle and the dental tissues, enamel and dentine, and utilized a variety of experimental techniques on both avian and mammalian embryos to explore specificity and patterning of the vertebrate head. Whether similar developmental processes pattern homologous structures in different Vertebrate classes (Amphibia, Aves, Mammalia) was discussed with reference to patterning of the cranial musculature, chondrocranium and dental tissues...
1988: Development
H C Slavkin, M L Snead, M Zeichner-David, M MacDougall, A Fincham, E C Lau, W Luo, M Nakamura, P Oliver, J Evans
The forming tooth organ provides a number of opportunities to investigate the cellular and molecular biology of cell-mediated extracellular matrix (ECM) biomineralization. Regulatory processes associated with tooth formation are being investigated by identifying when and where cell adhesion molecules (CAMs), substrate adhesion molecules (SAMs), dentine phosphoprotein and enamel gene products are expressed during sequential developmental stages. In vitro organotypic culture studies in serumless, chemically-defined medium, have shown that instructive and permissive signalling are required for both morphogenesis and cytodifferentiation...
1988: Ciba Foundation Symposium
H C Slavkin
The regulatory processes associated with tooth formation are being investigated by the identification of when, where, and how cell adhesion molecules (CAMs), substrate adhesion molecules (SAMs), dentin phosphoprotein, enamel gene products, and intermediate cementum products are expressed during sequential developmental stages of morphogenesis, cytodifferentiation, dentin, enamel and cementum extracellular matrix (ECM) formation, and biomineralization. Instructive and permissive signaling is required for both morphogenesis and cytodifferentiation based upon in vitro organotypic culture studies in serumless, chemically-defined medium...
September 1988: Journal of Dental Research
M Melnick, E D Shields, A H El-Kafrawy
A large kindred of which multiple members have the Tricho-dento-osseous syndrome is presented. This is an autosomal dominant disorder characterized by defective enamel, taurodontia, unusually curly hair and occasionally mild to moderate skeletal osteosclerosis. Histologic investigation of teeth (by both LM and SEM) demonstrated that there is a uniformly thin enamel covering with randomly distributed depression and pits. The mineral content of this enamel is closer to that of the underlying dentin, which accounts for its lack of radiographic contrast...
July 1977: Clinical Genetics
T Yonaga
The effect of parathyroid hormone (PTH) on the formation of the incisor in the rats was investigated using a time marker by the injection of lead acetate. 1) When intact immature rats were fed on a low calcium diet, the rate of the longitudinal and appositional formation of the incisal dentin was increased. 2) Both formations were inhibited by parathyroidectomy (PTX) or thyro-parathyroidectomy (TPTX), the inhibition being stronger in the appositional than in the longitudinal formation. The mechanism generating the characteristic responses (thin dentin and irregularity of dentin formation) which appeared after the operations was made clear...
December 1978: Bulletin of Tokyo Medical and Dental University
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