Study of Bone Preservation When OsseoSpeed™ Implants Are Placed Immediately Following Tooth Extraction

Inclusion Criteria: * Provision of written informed consent * At least 18 years at inclusion * At least 20 teeth with expected functional balanced occlusion after restoration * In need of one or more implants replacing teeth to be removed in the maxilla within region 15 to 25 * Presence of an intact extraction socket following removal of the natural tooth defined by: (1) a situation where the marginal border of the facial bone crest deviates less than or equal to 2 mm from that of the expected normal anatomy of the site/region, (2) a marginal border of a potential facial fenestration at least 3 mm apical of the marginal bone crest * Presence of an extraction socket anatomy, following removal of the natural tooth, suitable for both cylindrical and conical/cylindrical implants Exclusion Criteria: * Untreated rampant caries and uncontrolled periodontal disease * Absence of adjacent (mesial and/or distal) natural tooth root * 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 * Need for systemic corticosteroids or any other medication that would compromise post-operative healing and/or osseointegration * History of radiation in the head and neck region * History of chemotherapy within 5 years prior to surgery * Unable or unwilling to return for follow-up visits for a period of 3 years and 6 months * Unrealistic esthetic demands * 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 investigational site) * Previous enrolment in this study