Figure 36. Day 60 - 180 : Initial periosteum formation After 60 to 90 days, newly formed woven bone forms a bridge across the entrance of the socket. The epithelium covering the bone is keratinized. Soft tissue healing at this stage has been completed. At 90 to 180 days after tooth extraction, the woven bone is gradually remodeled into cortical bone. A periosteum is established with collagen ...

Figure 35. Day 21 - 30 : keratinized epithelium After 21 to 30 days, the marginal soft tissue compartment of the socket is characterized by a well-organized fibrous connective tissue lined with a keratinized epithelium.

Figure 34. Day 4 - 14 : Epithelial proliferation & connective tissue After 4 to 5 days, the epithelium from the margins of the soft tissue starts to proliferate to cover the granulation tissue in the socket. At 14 days, the connective tissue at the marginal portion of the extraction socket is partially lined by epithelial cells.

Figure 33. Day 3: granulation tissue & inflammatory cells After 3 days, small segments of the coagulum at the margins of the socket are replaced by a highly vascularized granulation tissue with an inflammatory cell infiltrate.

Figure 32. Day 1: Coagulum & inflammatory cells   Figure 33. Day 3: granulation tissue & inflammatory cells The soft tissue healing at the entrance of the socket also follows a specific pattern: At day 1 after extraction, the marginal portion of the coagulum is covered with a layer of inflammatory cells, mainly neutrophils. After 3 days, small segments of the coagulum a...