Fosse G, Saele PK, Eide R. Numerical density and distributional pattern of dentin tubules. Acta Odontol Scand 1992;50;201-210. Oslo. ISSN 0001-6357. By a new method the numerical density and distributional pattern of transversely cut dentin tubules and the diameters of their peritubular dentin walls were measured in sections near the dentin-enamel junction (DEJ), midway to the pulp, and near the pulp wall in human premolars. For each section the mean and standard deviation of these variables were expressed. At all three levels the measurements comprised the same bundle of tubules from the DEJ to pulp in the coronal dentin. The number of tubules per square millimeter increased more than three times, and the diameters of peritubular dentin decreased one-tenth, whereas central distances between tubules were halved from DEJ to pulp. Thus the pulpward reduction of intertubular dentin is quantified. The distribution of the tubules is not regularly hexagonal, but the distances between them at each given depth are still very uniform in all directions. The pattern of cross-cut tubules often showed distinct short curved rows. The quantitative method might be used to determine taxonomic affinities. 0 Dentin; morphometry; peritubular dentin; tubules Gble Fosse,

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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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