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  • Intrinsic fiber  (2)
  • Cellular cementum  (1)
  • Multinucleation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Formation of an alternate lamellar pattern in the advanced cellular cementogenesis in human teeth (1997)
    Springer
    Anatomy and embryology 196 (1997), S. 115-121 
    Details
    ISSN: 1432-0568
    Keywords: Key words Cellular cementum ; Intrinsic fiber ; Cementoblast ; Human tooth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The formation of an alternate lamellar pattern in the advanced stage of cellular cementogenesis in human molars was examined by light and electron microscopy. In longitudinal ultrathin sections, longitudinally oriented intrinsic fibril bundles appeared in close and parallel association with slender processes of cementoblasts on the cementum. Where transversely oriented intrinsic fibril bundles appeared, cementoblasts formed indentations to enclose the fibril bundles. Cytoplasmic fragments were also enclosed in the indentations. Scanning electron microscopy indicated that cementoblasts have developed two types of processes on their cementum-facing side – ridge- and finger-like. The cementoblasts formed groove-like compartments by ridge-like processes in cooperation with other cementoblasts. The compartments formed groups, and in each group the compartments were arranged in the same direction. The finger-like processes were arranged in parallel with the ridge-like processes in the compartments. These observations suggest that: (1) slender processes and cytoplasmic fragments are longitudinally and transversely cut finger-like processes, respectively; (2) the cellular indentations are transversely cut groove-like compartments; (3) the cementoblasts regulate the intrinsic fiber arrangement by the two types of processes; (4) the cementoblasts move the two types of processes synchronously and periodically to cause an alternate change in the intrinsic fiber arrangement. This dynamic sequence results in the alternate lamellar pattern of cellular cementum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004290050084
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cellular cementogenesis in rat molars: the role of cementoblasts in the deposition of intrinsic matrix fibers of cementum proper (1996)
    Springer
    Anatomy and embryology 193 (1996), S. 495-500 
    Details
    ISSN: 1432-0568
    Keywords: Cementoblast ; Extrinsic fiber ; Intrinsic fiber ; Periodontal ligament ; Rat molar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The formation of intrinsic fibers was examined in the advanced stage of rat cellular cementogenesis by light and electron microscopy. Using scanning electron microscopy, cementoblasts showed wing-like processes, partly encircling principal fibers. At the cementum-facing side of the cells these processes showed segmentation into finger-like processes, arranged in parallel with the cementum surface. Transmission electron microscopy showed many cytoplasmic fragments around intrinsic fibers at the cementum surface. These fragments contained microtubules and collagenous secretory granules that were arranged in parallel with the cementum surface and the intrinsic fibers. The wing-like processes contained microtubules and secretory granules that were arranged perpendicularly to the cementum surface and in parallel with the principal fibers. These observations suggest that: (1) the cytoplasmic fragments are cross-sectioned finger-like processes; (2) cementoblasts secrete intrinsic fibers from the finger-like processes and additional principal fibers from the wing-like processes; (3) cementoblasts constantly shorten their wing-like processes by forming finger-like processes. This development starts at the side facing the cementum and proceeds towards the periodontal ligament. With the segmentation, the cementoblasts change the arrangement of secretory granules to secrete intrinsic fibers around preformed principal fibers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185880
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative study of the initial genesis of acellular and cellular cementum in rat molars (1994)
    Springer
    Anatomy and embryology 190 (1994), S. 521-527 
    Details
    ISSN: 1432-0568
    Keywords: Cellular cementum ; Acellular cementum ; Cementoblast ; Rat molar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The initial genesis of acellular and cellular cementum was examined in rat molars by light and electron microscopy. Before root dentinogenesis, flattened dental follicle cells formed compartments by regularly arranged cellular processes which demarcated collagen fibril bundles oriented in parallel with the root long axis in both of the two kinds of cementum. After this stage, compartments disappeared from the dental follicle cells, which became elongated and polarized, with the cytoplasmic side facing toward the root surface in the acellular cementogenesis. Fibril bundles, oriented in parallel with the root long axis, decreased in number, and principal fibers appeared. Some principal fibers were attached on the first acellular cementum. Observations suggested that the fibril bundles, which had been oriented in parallel with the root long axis, were reoriented to merge into the principal fibers. In cellular cementogenesis, the dental follicle cells continued to hold the fibril bundles in cellular compartments. The regular processes were transformed into randomly oriented, finger-like processes. At the same time, fibers, which may be secreted from the finger-like processes, appeared around the preformed fibril bundles oriented in parallel with the root long axis. The different cellular behavior may result in the different fiber arrangement of acellular and cellular cementum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190102
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  • 4
    Electronic Resource
    Electronic Resource
    Electron microscopic and histochemical studies of the mononuclear odontoclast of the human (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 240 (1994), S. 42-51 
    Details
    ISSN: 0003-276X
    Keywords: Osteoclast ; Ruffled border ; Mononuclear cell ; Multinucleation ; Electron microscopy ; Three-dimensional reconstruction ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Background: Osteoclasts and odontoclasts are multinucleated giant cells which resorb hard tissue by the ruffled borders. Recently, the authors reported the presence of a mononuclear osteoclast with a ruffled border in vitro. However, its presence in vivo has not been shown. To demonstrate the presence of a mononuclear odontoclast in humans, the present study used human deciduous teeth.Methods: After fixation and declacification, tartrate-resistant acid phosphatase (TRACPase) activity was detected with the azo dye method, and then TRACPase-positive cells were observed on resorbing areas of teeth. TRACPase-positive cells could be distinguished from other cells by light microscopy, and the cells for investigation were serially sectioned by alternating semithin and ultrathin sections to observe their ultrastructure and three-dimensional organization.Results: TRACPase activity was detected in both multinucleated odontoclasts and a mononuclear cell from serial sections. By electron microscopy, most of the multinucleated odontoclasts had ruffled borders and clear zones. A mononuclear TRACPase-positive cell with a ruffled border and clear zone was reconstructed three-dimensionally by NIKON COSMOZONE 2SA. The reconstruction showed that this cell had one irregularly shaped nucleus and a wide ring-shaped clear zone and a small ruffled border. Under the ruffled border, this cell formed a small lacuna on the dentin surface. The results suggested that this cell was a mononuclear odontoclast.Conclusions: The present study concludes that cells with ruffled borders and clear zones observed by transmission electron microscopy can be identified as odontoclasts or osteoclasts irrespective of the number of nuclei. © 1994 Wiley-Liss, Inc.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092400105
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    Paper (German National Licenses)
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