Study Comparing Appearance and Function of Three Different Dental Implant Designs When Placed in Front Region of Upper Jaw

Inclusion Criteria: * Provision of informed consent * At least 18 years * In need of one or more single implants replacing missing or non-restorable teeth in the maxilla within region 14 to 24 The following should be considered at inclusion but can not be fulfilled until at Visit 2: * Edentulous for at least 5 months at study site * A buccal-lingual bone width at study site of at least 5.5 mm * A mesial-distal bone level distance between adjacent teeth at study site of at least 5.5 mm * A keratinized mid-buccal mucosal height of at least 2 mm at study site * Teeth adjacent (mesial and distal) to study site must consist of two stable teeth on natural roots without signs of periodontal bone loss (\>1 mm) and/or significant soft tissue loss * Teeth adjacent (mesial and distal) to study site must demonstrate a stable occlusal guidance that will allow non-functional disclusion in all eccentric positions * An opposing dentition with teeth, implants or prosthesis Exclusion Criteria: * Insufficient interocclusal distance for implant placement and restoration at study site * Tooth adjacent (mesial and/or distal) to study site is ankylosed * More than 2 mm vertical bone loss at study site as measured from the mid-buccal crest of bone on the adjacent teeth * Site development (bone tissue) performed at less than 5 months before Visit 2 at study site * Untreated rampant caries and/or uncontrolled periodontal disease * Class II division 2 malocclusion (Edward Hartley Angle) * Use of tobacco within last 6 months * Uncontrolled diabetes (subjects history does not reveal the absence of control of insulin-dependent/non-insulin dependent Diabetes Mellitus) * Current alcohol or drug abuse * Systemic or local disease or condition that would compromise post-operative healing and/or osseointegration * Use of any substance that will influence bone metabolism * Need for systemic corticosteroids or any other medication that would influence post-operative healing and/or osseointegration * History of radiation in the head and neck region * Known pregnancy, pregnancy tests will be performed as per local requirements. * Unable or unwilling to return for follow-up visits for a period of 5 years * Unlikely to be able to comply with study procedures according to Investigators judgement * Involvement in the planning and conduct of the study (applies to both Astra Tech staff or staff at the study center) * Previous enrollment or randomization of treatment in the present study.