Characterization of interglobular dentin and Tomes' granular layer in dog dentin using Electron Probe Microanalysis in comparison with predentin

Masahiro Tsuchiya, Y. Sasano, M. Kagayama, Makoto Watanabe

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The interglobular dentin (IG) and the Tomes' granular layer (TGL) as well as predentin are hypomineralized regions in dentin. Some previous studies proposed that the IG and the TGL are identical with difference only in size, whereas other suggested that they are distinct structures. In order to characterize their matrix components, the present study was designed to analyze the elements of calcium (Ca), phosphorus (P), and sulfur (S) in the IG and the TGL in comparison with predentin using the Electron Probe Microanalysis (EPMA). The TGL was highest in the concentration of both Ca and P among the hypomineralized regions followed by the IG and predentin, whereas predentin was the highest in the concentration of S followed by the IG and the TGL. Alcian blue staining suggested that the S elements identified with the EPMA are incorporated into the sulfated glycosaminoglycan chains of proteoglycans. The present study first demonstrated distinct characteristics of matrix components in the IG and the TGL, i.e., the IG is poorer in mineralization but much richer in a proteoglycan content than the TGL. The IG may originate from predentin because of their analogy, whereas the TGL may follow a different ontogeny.

Original languageEnglish
Pages (from-to)172-178
Number of pages7
JournalCalcified Tissue International
Volume68
Issue number3
DOIs
Publication statusPublished - 2001 May 7

Keywords

  • Electron probe microanalysis
  • Hydroxyapatite
  • Interglobular dentin
  • Proteoglycan
  • Tomes' granular layer

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine
  • Endocrinology

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