The Influence of a New Implant Neck Configuration on Hard and Soft Tissue Healing

Inclusion Criteria: * Male or female ≥18 years old * Each patient will have one missing tooth in the posterior mandible (positions 4-6). There must be a natural tooth mesially and distally to the implant site. Free end situation are not allowed. * Adequate bone quality and quantity at the implant site to permit the insertion of a SWEDEN AND MARTINA® Prama Implant in the diameter of 4.25 mm and in the length of 8.5 mm, 10 mm or a Straumann Tissue Level in the diameter of 4.1 mm and in the length of 8 mm or 10mm. * Opposing dentition must be natural teeth or teeth/implant supported fixed restoration(s). * Patient has been informed of the follow-up visits and is willing to return to the clinical center for these follow-up visit. Exclusion Criteria: * These exclusion criteria might be systemic or local. In addition to the general contra-indication for dental implants the following exclusion criteria will be observed: Systemic exclusion criteria: * Medical conditions requiring prolonged use of steroids and/or with medications that can interfere with bone metabolism * History of leukocyte dysfunction and deficiencies * History of neoplasic disease requiring the use of radiation or chemotherapy * Patients with history of renal failure * Patients with metabolic bone disorders such as osteoporosis * History of uncontrolled endocrine disorders * Physical handicaps that would interfere with the ability to perform adequate oral hygiene * Use of any investigational drug or device wit…