(a)
(b)
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(d)
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Figure 1: Photomicrograph of histological section of the dental pulp for different time periods. (a) Showing the control group: 1 = odontoblastic layer; 2 = Weil zone (cell-free zone); 3 = cell-rich zone; 4 = central pulp area. (b) Photomicrograph of a histological section showing in detail the odontoblastic layer of the dental pulp of the 1 d group. White arrows indicate the inflammatory cells; black arrows indicate the areas of congested vessels. (c) Photomicrograph of a histological section showing areas of congested vessels and edema in the pulp center of the 3 d group. Arrows indicate the areas of congested vessels. (d) Photomicrograph of a histological section showing areas of congested vessels and edema in the pulp center of the 7 d group. Arrows indicate the congested vessels. (e) Photomicrograph showing the vascularization of the central layer of the pulp of the 2 w group. Arrows indicate the vessels. (f) Photomicrograph showing blood cells inside the vessels of the pulp of the 4 w group (images on the left: magnification ×200, bar = 100 μm; images on the right: magnification ×1000).