Outcome of Implant-supported Overdentures

Inclusion Criteria: * Female and male subjects older than 18 years. * Edentulous patients with a bone atrophy, which necessitates the use of diameter-reduced implants and excessive augmentation procedures are denied by the patient. * Sufficient bone supply with minimal risk of injury to neighboring structures when using two 10 mm or longer implants per jaw. * Bone height above the N. alveolaris inferior of at least 11 mm and the precondition of a one-stage implantation and augmentation. * Good health condition according to the Physical Status Classification System one or two (American Society of Anesthesiologists, ASA 2010) * Good oral hygiene and an at most moderate tobacco consumption * Signed informed consent Exclusion Criteria: * Indication for large augmentations of the jaw bone * Allergy to metallic implant components or prosthesis plastics * Bisphosphonate therapy * Chemo-, immuno-, or radiation therapy * Psychological disorder * Substance abuse * Pregnant woman * Persons who are placed in an institution on a judicial or administrative order * Any other circumstances that prevent the use of oral surgery