The Dental cosmos . Dentine of a dead temporary tooth. Trans-verse section of canaliculi, stained with chlorideof gold, decalcified with acetic acid. X , C, dentinal canaliculi, holding shriveled den-tinal fibers ; B, B, basis-substance, containinga^shriveled, indistinct reticulum. MINUTE STRUCTURE OF DENTINE. 72I this region is rather prone to be overstained and become too dark forexamination with high powers ; hence, we should examine this regionbefore it has assumed a deep stain, owing to a protracted exposure tolight. The first feature which strikes us upon approaching the outerperip
The Dental cosmos . Dentine of a dead temporary tooth. Trans-verse section of canaliculi, stained with chlorideof gold, decalcified with acetic acid. X , C, dentinal canaliculi, holding shriveled den-tinal fibers ; B, B, basis-substance, containinga^shriveled, indistinct reticulum. MINUTE STRUCTURE OF DENTINE. 72I this region is rather prone to be overstained and become too dark forexamination with high powers ; hence, we should examine this regionbefore it has assumed a deep stain, owing to a protracted exposure tolight. The first feature which strikes us upon approaching the outerperiphery of the dentine is the beaded appearance of the dentinalfibers, lacking vacuoles in this situation. The fibers are bifurcating,as is well known, and, becoming more and more delicate, correspond-ingly exhibit more and more beads. The reticulum into which thelateral conical offshoots of the dentinal fibers inosculate is extremely Fig. Dentine of temporary tooth, near enamel, stained with chloride of gold, decalcified with aceticacid. X 1200. B, B, boundary of dentine toward enamel: /, /, interzonal layer (Atkinson),with a dense reticulum, dentinal fibers bifurcating ; D, D, main mass of dentine, holding beadeddentinal fibers. dense,—much more so than in the rest of the dentine. The denselyreticulated zone usually corresponds to the depth of the bifurcationsof the dentinal fibers ; in other words, it commences in a rather abruptline in the height in which bifurcations begin to appear. (See Fig. 5.) The presence of this dense reticulum of living matter obviouslyexplains the fact that the interzonal layer between enamel and dentineis so extremely sensitive. I am sure that every dentist is made awareof this striking fact when cutting into dentine. The dentinal fibersrarely enter the enamel in human teeth, but, as already stated byBodecker (1. a), the reticulum of the dentine is continuous with that VOL. XXXIII.—52
Size: 1447px × 1727px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
