Studies on the Fibers of Dentin Matrix and Dentinal Tubules

Ichijo, Takashi; Yamashita, Yasuo; Ono, Takeshi; Wakita, Minoru; Suzuki, Shunsuke; Kozawa, Yukishige; Goto, Masatoshi

doi:10.5357/koubyou.42.75

Cited by 4 publications

(3 citation statements)

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“…From the fact that, in the formational process of peritubular dentin, the collagenous fibers are gradually arranged anew in the direction of the center of dentinal tubular cavity along its long axis as determined by its original wall [5], it is to be inferred that these fibers seen here may correspond to the matrix fibers.…”

Section: Discussionmentioning

confidence: 99%

“…That is to say, in peritubular dentin these crystals are dense and constitute highly mineralized layers [1,2,[4][5][6][7][8][9][10], whereas in interdentinal dentin they are sparse and in a state of deposition. But the boundary between the two is by no means clear enough, showing a transitional condition, and the direction of these crystals was based on that of the matrix fibers in intertubular dentin.…”

Section: Discussionmentioning

confidence: 99%

“…Considered in terms of their direction and location, these fiber bundles are thought to be the matrix fibers of peritubular dentin corresponding to hypomineralized layer among the tubular structures that is produced through the acid corrosion of peritubular dentin [5][6][7].…”

Section: Discussionmentioning

confidence: 99%

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A Scanning Electron Microscope Consideration of the Structure of Peritubular Dentin

Kubota

Sekikawa

Shimamura

et al. 1978

The Journal of Nihon University School of Dentistry

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Although the minute structure of peritubular dentin is well known, we found it possible to obtain detailed images of what might be considered to be its hypomineralized layers in our investigation of dentin by use of a scanning electron microscope. As a detailed report on this subject is scanty in the published literature, it is here reported before the interested parties. Material and MethodTwo human third molars from the subjects, 28 and 34 in age, were selectively used for the present study. These teeth were fractured by means of a dental diamond disk and chisel. Subsequently, the fractured pieces were fixed in a solution of 2% glutaraldehide buffered at pH 7.4 with sodium cacodylate for about 2 hours.The crown dentin fractures were post-fixed in 2% osmium tetroxide for 1 hour. They were then routinely dehydrated through graded alcohols, and were coated with gold palladium by ion spattering for purposes of scanning electron microscope observation. FindingsIn the sectional images of dentin, dentinal tubules, peritubular dentin and intertubular dentin were observed (Fig. 1, a and b). Although the dentinal fibers were absent inside dentinal tubules giving an impression of being hollow, there were exposed several fibers, around 70 nm in thickness, along the wall of the sectioned dentinal tubules. These fibers were observed to possess the transverse structures corresponding to about 640 A intervals or distances.On the surface of fractured dentin, there were found crystals that were more or less identical in being 20 nm in thickness, these becoming more dense in peritubular dentin than in intertubular dentin.Because of the above fact, the orientation or direction of these crystals could not be determined definite enough. Yet it was observed that, in intertubular dentin, these crystals showed a certain directionality as small groups, though they were somewhat irregular (indicated by an arrow). As regards the vertical images of dentinal tubules (Fig. 2, a and b), it was possible to distinguish peritubular dentin as being at Matsudo, Chiba,

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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A Scanning Electron Microscope Consideration of the Structure of Peritubular Dentin

Kubota

Sekikawa

Shimamura

et al. 1978

The Journal of Nihon University School of Dentistry

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Clinical Science

et al. 1981

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Ultramicroscopic carious changes were studied by using longspan ultrathin sections of dentin, which included a continuous piece of dentin from the pulp chamber wall up to the carious cavity floor. The changes observed in the inner carious dentin were gradual and continuous, with dissolution of crystals attached to the matrix fibers, whereas the changes observed in the outer carious dentin were rather abrupt and definite, with irregularly-scattered fine-granular crystals.

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