 The implants will be inserted under local anaesthesia using a surgical template derived from a tooth wax-up. The implants will be placed in a 1-stage non-submerged procedure according to a strict protocol Weingart D and ten Bruggenkate 2000. Postoperatively, antibiotics for 5 days treatment Amoxicillin and Clavulanate Potassium or Erytromycin - for patients alergic to Penicillin, analgesics and Clorhexidine 0,12 mouth rinse will be prescribe for 14 days. Patients will not be allowed to wear the mandibular denture during the first two weeks post-operatively. 