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Apex of a root with cementum (40X)

Microimage
Image copyright: Mathias Nordvi, ARR. (Tissue stain: H+E).

This is a longitudinal section of the apical part of a root and is well suited to study the cementum. The apical supportive tissues are also shown. You may already have noticed the thick layer of cementum covering the dentine of the apex. You may also have made the thought that this tooth once belonged to an old individual. If that's right, you can pat yourself on the back because it's true! This is because the cementum is thick and mostly of the cellular type. There are many incremental lines which illustrate the "rhythmical" deposition of cementum through many years.