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[The lamina limitans. Its scanning electron microscopic aspects].

G Pagavino1, R Pace, P Pierleoni

  • 1Istituto di Odonto-Gnato-Stomatologia, Università degli Studi di Firenze.

Minerva Stomatologica
|July 1, 1991
PubMed
Summary
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The extracellular organic matrix within dental tubules, not odontoblast processes, forms a sheet-like structure. Demineralization reveals this "lamina limitans," crucial for dentine formation and tubular sclerosis.

Area of Science:

  • Dentistry
  • Biomaterials Science
  • Histology

Background:

  • The precise nature of the membraneous structures in dental tubules has been debated.
  • These structures were previously misidentified as cytoplasmic membranes of odontoblastic processes.

Purpose of the Study:

  • To investigate the extracellular organic matrix within dental tubules using scanning electron microscopy (SEM).
  • To examine the structural changes of this matrix under normal conditions and after citric acid demineralization.

Main Methods:

  • Human teeth were fixed and fractured.
  • Samples underwent demineralization with citric acid.
  • All samples were dehydrated and metallized for SEM observation.

Main Results:

Related Experiment Videos

  • Demineralization removed peritubular dentine, exposing a continuous sheet-like structure lining the dental tubules.
  • This structure, termed "lamina limitans," was not apparent in non-demineralized samples due to adhesion to the tubule wall.
  • The "lamina limitans" exhibits a high content of glycosaminoglycans.

Conclusions:

  • The identified sheet-like structure is an extracellular organic matrix, not part of the odontoblastic processes.
  • The "lamina limitans" plays a significant role in regulating peritubular dentine formation and tubular sclerosis.
  • Further research into this structure is warranted for understanding dentine development and pathology.