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Test Site. (a) Pre-operative photograph, (b) exposed impacted tooth, (c) socket immediately after extraction, (d,e) collagen membrane placed on the distal aspect of the second molar, (f) primary closure of the socket. (g) Pre-operative Radiograph, (h) radiographs on the day of suture removal, (i) radiographs on 90th day, (j) radiographs on 180th day.
