Mostehy, MR, Stallard, RE. Intermediate Cementum. J. Periodont. Res. 3: 24-39, 1968.

Aim

• To determine the origin of 'intermediate cementum' by relating its location to the position of the junction between cementum and dentin.
• There is a ill-defined larger in the region of cemento dentinal junction that shows neither the regular tubular structure of dentin nor the typical lacunae of cellular cementum.

Methods

• 137 intact human teeth.
• Longitudinal sections prepared.
• Stained with Ehrlich's hematoxylin and eosin.

Results

• Collagen fiber bundle located in the peripheral layer of the root dentin show a lace-like or looped arrangement.
• Cellular enclosures within 'intermediate cementum.
• Cells trapped in spaces formed in the rapidly calcifying ground substance of the dentin surface.
• All sections showed spaces and cells, they increase in number towards apex. in the bifurcation of multi-rooted teeth.
• Collage hiatus was observed to split in areas of 'intermediate cementum'.

Conclusion

• 'Intermediate cementum' was not a separate lager with its own histogenesis or morphogenesis but rather an area between cementum and dentin containing cellular debris trapped in rapidly calcifying matrix.
• There entrapped cells only found on the apical 2/3 of roots of molars and premolars.
• The cellular inclusions that exists in this layer are epithelial cells of Herthig's root sheath that failed to separate from the dentin surface.

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