Histochemical study of giant tubule content in dentin of unerupted cow incisors

Dyngeland, Trond; Fosse, Gisle; Justesen, Nils-Petter Berg

doi:10.1111/j.1600-0722.1984.tb00876.x

Cited by 8 publications

(16 citation statements)

References 5 publications

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“…In a series of papers, Hals and Dyngeland [Hals, 1983a[Hals, , b, c, 1984Dyngeland et al, 1983;Olson, 1984, 1985;Hals and Tötdal, 1985a, b;Dyngeland andFosse, 1986a, b, 1987;Dyngeland, 1988;Dyngeland and Kvinnsland, 1988] described the presence of giant tubules in the dentine of bovine, red deer and human teeth. These studies deal largely with the examination of unerupted anterior teeth using a variety of techniques including light microscopy, polarised light, microradiography, scanning electron microscopy and transmission electron microscopy to investigate the structure and function of these tubules.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Structure of Dentine from Cheek Teeth of Deer Chronically Exposed to High Levels of Environmental Fluoride

Appleton

Chesters²,

Kierdorf³

et al. 2000

Cells Tissues Organs

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The purpose of this study was to examine, using backscattered electron imaging, the changes occurring in the structure of the dentine including giant tubules in the teeth of deer chronically exposed to fluoride. The primary and secondary dentine was characterised by the presence of interglobular dentine and regular bands of hypo- and hypermineralised dentine. Giant tubules in the unworn teeth of animals exposed to low and high levels of fluoride were characterised by a large lumen and hypermineralised rim in which there were calcospherites. With the occlusal wear of the teeth tubules beneath the immediate surface of the exposed dentine in teeth from fluorotic animals became occluded with mineral, but in low fluoride animals some tubules at the surface were not occluded with mineral. It is suggested that mineral which occludes the tubules may come from both intrinsic and extrinsic sources. The presence of some open tubules at the immediate surface in the worn teeth of animals exposed to low fluoride suggests an extrinsic source for this mineral.

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Section: Introductionmentioning

confidence: 99%

Changes in the Structure of Dentine from Cheek Teeth of Deer Chronically Exposed to High Levels of Environmental Fluoride

Appleton

Chesters²,

Kierdorf³

et al. 2000

Cells Tissues Organs

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“…Prior to the demonstration ofa regular presented {i). The presence of cellular and occurrence of GT in human, red deer and other soft tissue elements, supposedly in a bovine teeth (1)(2)(3)(4)(5), liwng pulp tissue in necrotic stage within the GT lumina, has cuspal dentin of an unerupted human molar been shown (2). A histochemieal study of was found (6).…”

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confidence: 99%

Light microscopic study of giant tubules in bovine dentin

Dyngeland

Fosse

1986

European J Oral Sciences

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Dyngeland T, Fosse G: Light microscopic study of giaat tubules in bovine dentin. Scand J Dent Res 1986; 94: 381-93.Abstract -Detnineralized, H-E stained longitudinal and transversal sections of unerupted permanent incisors from 1/2-3-yr-oM calves were studied by light microscopy. The most incisal dentin in all teeth was characterized by a regular pattern of straight axialiy oriented giant tubules situated in the axiomesiodistal plane with interglobuiar dentin between them. In younger teeth, the pulpal part of every giant tubule contained an afferent and an efferent blood vessel, forming a hairpin loop and being surrounded by basophil ceMs. Incisal to the blood vessel loops, cells enbedded in an eosinophil matrix were present in the giant tubule lumina, showing increasing degenerative changes incisally. In older teeth there was a mesiodistaliy extended eosinophil dentin band near the pulp, with few, irregularly arranged, tortuous dentinal and gianS tubules, the latter containing single blood vessels accompanied by puipal cells. Isolated degenerating odontoblasts in lacunar cavities were seen in the transition area of the normal circumpulpal dentin and the eosinophil dentin band. A hypothesis on the initiation and subsequent development of giant tubules is presented.

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“…The second stage of GT formation was characterized by the axial growth ofthe GT and concomitant persistence of the blood vessel loops in close association with the GT origins (Figs. 12,13). Most GT origins contained a collagenous matrix which often was distinctly metachromatic ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore the dentin ofhuman and red deer teeth (1)(2)(3)(4)(5)(6) as preserved mitochondrial enzymatic activity well as in the root dentin of red deer teeth and collagen producing activity-of the cellu- (7). In recent studies on intact unerupted lar components within the GT were demonpermanent bovine incisors, location, mor-strated (12,13). phology, and ultrastructural characteristics…”

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Light microscopic and transmission electron microscopic study of initial phases of giant tubule formation in bovine dentin

Dyngeland

1988

European J Oral Sciences

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– Bovine tooth germs dissected from the mandible immediately after bleeding of the less than 1‐yr‐old calves (Bos taureus) were used to study the initial phases of giant tubule (GT) formation. Three stages could be discerned. Firstly, the initial manifestations were represented by loci about 150 μm apart in the axiomesiodistal plane along the pulpal border of the I00–200‐μm‐thick incisal dentin. Some of these loci showed only a blunt capillary loop and associated cells, whereas in most others there was a 50–100‐μm‐wide dense matrix consisting of coarse collagen fibrils and showing a metachromatic staining reaction to toluidine blue. Fibroblasts lined this matrix, and a capillary loop was always present underneath. Both kinds of GT origins were eventually circumvented by the odontoblasts situated incisal to them. The matrices became enclosed in the dentin. In the second stage, the GT grew in length as new dentin was formed. In this stage the vascular loops and the adjoining fibroblasts remained stationary within the GT lumina relative to the origins. In the third stage the GT vessels started to migrate pulpally relative to the origins. This seemed to be the result of a sequestration of the most incisal portions of the vascular loops. In this last stage the formation of collagen fibrils in the GT lumen incisal to the vessel loops started.

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Histochemical study of giant tubule content in dentin of unerupted cow incisors

Cited by 8 publications

References 5 publications

Changes in the Structure of Dentine from Cheek Teeth of Deer Chronically Exposed to High Levels of Environmental Fluoride

Changes in the Structure of Dentine from Cheek Teeth of Deer Chronically Exposed to High Levels of Environmental Fluoride

Light microscopic study of giant tubules in bovine dentin

Light microscopic and transmission electron microscopic study of initial phases of giant tubule formation in bovine dentin

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