Implants (OsseospeedTM,EV Astra Tech System, DentsplyTM, Mölndal) will be used. Preparation of the osteotomy for the implant sites will include the use of drills. A guide drill will establish the buccal-palatal/lingual and mesio-distal position of the implants. The final osteotomy preparation will be done by a single pass of an appropriate drill. Using a handpiece at 20 rpms and 50 Ncm of torque the implant will be placed. Primary stability must be obtained. Furthermore, the operator must ensure that a blood clot properly fills the void in the fresh extraction sockets. A MucograftTM membrane (Geistlich Pharma, Wolhusen, Switzerland) will be adapted to the entrance of the hard tissue defects. Sutures will be placed to secure the position of the membrane.The treatment should follow the guidelines described in the Astra Tech Manuals 'Surgical Procedures' and 'Cement-or screw- retained restorations -Clinical and laboratory procedures'. To avoid excessive loading of the implant during the healing period, the patient is not allowed to use any implant supported temporary restorations.