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Description of the operative process for the three groups. a–c CGFs/DBBM group. a Preoperative image for CGFs/DBBM group; b CGFs/DBBM mixture implanted into the tooth socket; c covered with CGF membranes and sutured; d-f: DBBM group, d preoperative image for DBBM group; e DBBM implanted into the tooth socket; f covered with Bio-Gide® membranes and sutured. g–h control group, g preoperative image for control group; h nothing implanted
