Patients will receive single implant in symphyseal region of mandible. The surgical procedure is carried out under local anaesthesia, following premedication with 2 g amoxicillin (or 600mg of clindamycin) and 1 g paracetamol. After two rinses with 0.2% chlorhexidine gluconate, each lasting 1 min, the labial and lingual mucosa of the anterior mandible is locally infiltrated with 2.2 ml of mepivacaine 2% with 1 : 100,000 adrenalin. The surgical guide made from the duplicated mandibular complete denture is used to mark the implant site.