Is Pulp Inflammation a Prerequisite for Pulp Healing and Regeneration?

Figure 2

Pulp capping with calcium hydroxide (Dycal). Two weeks after the direct capping of a calcium hydroxide (Dycal), within the pulp calciotraumatic lines (CTL) (arrows), separate the dentin formed before the preparation of the cavity from the reactionary dentin (RD). In the left part, the Ca(OH)₂ has induced the formation of a reparative bridge in the isthmus separating the central from the distal pulp horns of 6-week-old rat’s maxillary molar. On the left part of the pulp, the necrotic tissue is acellular, whereas in the right part of pulp, the vital pulp displays proliferating inflammatory cells (white asterisk). In the right part of the figure, pulp cells (P) differentiate and form odontoblast-like cells. 
Alizarin red staining. Bar = 100 μm.