Numerical density and distributional pattern of dentin tubules

Abstract

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,

Effect of remaining dentin thickness on microtensile bond strength of current adhesive systems

“…In general, the etching efficiency of acidic monomers decreases with depth because they are buffered by the substrate's mineral content 2) . Morphologically, the mineral content of dentin decreases with increasing depth 6,[28][29][30] . In terms of acidic monomers, SE1 contained 10-MDP while GB and BB contained 4-MET.…”

Dentin hypersensitivity: pain mechanisms and aetiology of exposed cervical dentin

“…In the crown, the tubules follow a double curved course but in the root and beneath the incisal tips, the tubules take a straighter course [44]. The circumference of the dentin at the peripheral part of the root or crown is much greater then nearer the pulp, leading to the columnar appearance of the odontoblasts as they are squashed together especially over the pulp horns [45]; the convergence of this unique structural organisation estimated at 4:1 [46] or 3:1 [47]. The number of tubules per unit area and radius of the tubules increases from enamel–cemental junction (~20,000 per mm 2 ) to the pulp (~45,000 per mm 2 ), as does the tubule lumina [48], resulting in the water content or wetness of the dentin increasing 20-fold from superficial to deep dentin in patent tubules [48].…”

Effect of remaining dentin thickness on bond strength of various adhesive systems to dentin

“…Dentin is a complex substrate composed of dentinal tubules, intertubular dentin and peritubular dentin. The dentinal tubule density is typically 30,000 tubules per square millimeter 2 mm from the pulp [11][12][13] . The number of tubules per square millimeter is increased more than three times from the dentino-enamel junction to pulp in the coronal dentin 12) .…”

“…The dentinal tubule density is typically 30,000 tubules per square millimeter 2 mm from the pulp [11][12][13] . The number of tubules per square millimeter is increased more than three times from the dentino-enamel junction to pulp in the coronal dentin 12) . The relative tubule density is greatest near the pulp and is associated with cusps 14) .…”