Bertl K, et al. - A retrospective radiographic study was done to evaluate the timeframe between tooth extraction and radiographically detectable socket cortication in humans. The outcomes show a considerably long timeframe until complete cortication of an extraction socket, that is, 3-6 months after tooth extraction 3 of 4 sockets were still not completely corticated, and only after 9–12 months, complete cortication was seen in about 80% of the sockets.