Fine structural changes and lysosomal phosphatase cytochemistry of ameloblasts associated with the transitional stage of enamel formation in the rat incisor

1991 ◽  
Vol 190 (3) ◽  
pp. 279-290 ◽  
Author(s):  
Ahmed H. Salama ◽  
A. E. Zaki ◽  
Dale R. Eisenmann
Keyword(s):  
Structural Changes ◽  
Transitional Stage ◽  
Enamel Formation ◽  
Rat Incisor ◽  
Phosphatase Cytochemistry

H+-K+-ATPase activity in the rat incisor enamel organ during enamel formation

1988 ◽  
Vol 221 (4) ◽  
pp. 823-833 ◽  
Author(s):  
Takahisa Sasaki ◽  
Katsumi Tadokoro ◽  
Takaaki Yanagisawa ◽  
Shohei Higashi ◽  
Philias R. Garant
Keyword(s):  
Atpase Activity ◽  
Enamel Organ ◽  
Enamel Formation ◽  
Rat Incisor

scholarly journals A Study of the effect of 1-hydroxyethylidene-1,1-bisphosphonate (HEBP) on the enamel formation in rat incisor

1990 ◽  
Vol 52 ◽  
pp. 301
Author(s):  
Hideaki Ogura ◽  
Hironari Wakamatsu ◽  
Keiichi Ohya ◽  
Shiro Mataki
Keyword(s):  
Enamel Formation ◽  
Rat Incisor

Effect of turpentine-induced fever during the enamel formation of rat incisor

2006 ◽  
Vol 51 (6) ◽  
pp. 464-470 ◽  
Author(s):  
Kuochung Tung ◽  
Haruko Fujita ◽  
Yasuo Yamashita ◽  
Yuzo Takagi
Keyword(s):  
Enamel Formation ◽  
Rat Incisor

Dynamics of Enamel Formation in the Rat Incisor Tooth

1979 ◽  
Vol 58 (2_suppl) ◽  
pp. 950-979 ◽  
Author(s):  
C.P. Leblond ◽  
H. Warshawsky
Keyword(s):  
Amino Acids ◽  
Cell Membrane ◽  
Organic Material ◽  
Organic Matrix ◽  
Incisor Tooth ◽  
Enamel Formation ◽  
Rat Incisor ◽  
Full Size ◽  
Matrix Deposition ◽  
Mineral Deposition

Enamel formation was reviewed by morphology and radioautography in rat incisors. Labeled amino acids and sugars were used as matrix precursors whereas labeled calcium monitored mineral deposition. All ameloblasts synthesize organic material, but only cells in the zone of secretion release labeled matrix. The pattern of matrix deposition indicates that enamel rods are elaborated by Tomes' processes within cavities formed by interrod partitions. The latter are elaborated by cytoplasmic projections from adjacent ameloblasts. Initially - labeled matrix is added as a band near the cells. With time the label randomizes throughout the entire immature enamel and most of it is lost in the zone of maturation. However, a glycoprotein component attributed to remnants of Tomes' process membrane persists in mature enamel. Labeled calcium is incorporated into crystals which grow at a uniform rate throughout the entire layer of enamel in the zone of secretion and up to the middle of the zone of maturation. The ribbon-like crystals are built close to the cell membrane and elongate as the cell recedes. Crystal elongation occurs in the same location as new matrix is deposited; that is, rod crystals are related to Tomes' processes and interrod crystals, to cytoplasmic projections. The crystals grow to full size mainly by thickening and this growth presumably displaces the organic matrix.

The effect of strontium, cobalt and fluoride on rat incisor enamel formation

1975 ◽  
Vol 183 (2) ◽  
pp. 303-321 ◽  
Author(s):  
Abraham Neiman ◽  
Dale R. Eisenmann
Keyword(s):  
Enamel Formation ◽  
Rat Incisor

The effect of rate of eruption on periodontal ligament glycosylaminoglycan content and enamel formation in the rat incisor

1993 ◽  
Vol 274 (2) ◽  
pp. 413-419 ◽  
Author(s):  
J. Kirkham ◽  
C. Robinson ◽  
J. K. Phull ◽  
R. C. Shore ◽  
B. J. Moxham ◽  
...  
Keyword(s):  
Periodontal Ligament ◽  
Enamel Formation ◽  
Rat Incisor

Cytochemical localization of Ca2+-Mg2+ adenosine triphosphatase in rat incisor ameloblasts during enamel secretion and maturation.

1987 ◽  
Vol 35 (4) ◽  
pp. 471-482 ◽  
Author(s):  
A H Salama ◽  
A E Zaki ◽  
D R Eisenmann
Keyword(s):  
Adenosine Triphosphatase ◽  
Cell Membranes ◽  
Developmental Stages ◽  
Electron Microscopic ◽  
Enamel Formation ◽  
Rat Incisor ◽  
Cytochemical Localization ◽  
Intense Reaction ◽  
Enamel Mineralization ◽  
Electron Microscopic Cytochemistry

A modified Wachstein-Meisel medium containing lead or cerium as capturing ions was used to localize Ca2+-Mg2+ adenosine triphosphatase (ATPase; EC 3.6.1.3) in rat incisor ameloblasts during enamel formation. Sections representing different developmental stages were processed for electron microscopic cytochemistry. Distribution and intensity of the observed reaction product, which was almost exclusively associated with cell membranes, varied according to the stage of enamel formation. During the secretory stage, intense reaction product was evident along the entire plasma membrane of ameloblasts and papillary cells. The early transitional ameloblasts showed reaction product on their proximal and lateral cell membranes, but not distally. In late transitional (pre-absorptive) ameloblasts, distal cell membranes exhibited intense reaction product. During enamel maturation, smooth-ended ameloblasts showed reaction product proximally and laterally, but not distally. Ruffle-ended maturative ameloblasts exhibited intense reaction product along their lateral and distal membranes. The intensity of the latter was decreased but not eliminated by levamisole. In the transition from smooth-ended to ruffle-ended cells, the reaction product became evident distally, concomitant with the appearance of cell membrane invaginations. These data are consistent with a possible role for Ca2+-Mg2+ ATPase in controlling calcium availability at the enamel mineralization front.

Fine Structural Changes in the Microvasculature of the Mouse Pinna: Aging and Radiation Injury

1974 ◽  
Vol 32 ◽  
pp. 54-55
Author(s):  
S. Phyllis Steamer ◽  
Rosemarie L. Devine
Keyword(s):  
Structural Changes ◽  
Radiation Treatment ◽  
Arterial Stenosis ◽  
Ultrastructural Changes ◽  
Vascular Effects ◽  
Microvascular Changes ◽  
Surrounding Connective Tissue ◽  
Fission Neutrons ◽  
Total Body

The importance of radiation damage to the skin and its vasculature was recognized by the early radiologists. In more recent studies, vascular effects were shown to involve the endothelium as well as the surrounding connective tissue. Microvascular changes in the mouse pinna were studied in vivo and recorded photographically over a period of 12-18 months. Radiation treatment at 110 days of age was total body exposure to either 240 rad fission neutrons or 855 rad 60Co gamma rays. After in vivo observations in control and irradiated mice, animals were sacrificed for examination of changes in vascular fine structure. Vessels were selected from regions of specific interest that had been identified on photomicrographs. Prominent ultrastructural changes can be attributed to aging as well as to radiation treatment. Of principal concern were determinations of ultrastructural changes associated with venous dilatations, segmental arterial stenosis and tortuosities of both veins and arteries, effects that had been identified on the basis of light microscopic observations. Tortuosities and irregularly dilated vein segments were related to both aging and radiation changes but arterial stenosis was observed only in irradiated animals.

Sign in / Sign up

Export Citation Format

Share Document