Study to Compare Survival for ASTRA TECH Implant System, OsseoSpeed™ Implants Following Immediate Loading in Extraction Sockets Versus Immediate Loading in Healed Ridges

An Open, Prospective, Controlled Study in the Maxilla to Evaluate Clinical Outcome of ASTRA TECH Implant System, OsseoSpeed™ Implants in Single Tooth Replacement Using an Immediate Loading Protocol in Extraction Sockets and Healed Ridges.

The purpose of this study is to evaluate survival for ASTRA TECH Implant System, OsseoSpeed™ implants following immediate loading in extraction sockets versus immediate loading in healed ridges. Patients in need of single standing implants replacing teeth in the maxilla within zone 15-25 will be included and followed for 5 years. Primary objective is implant survival rate at 12 months.

Inclusion Criteria:

• Provision of written informed consent
• 18 years of age and over
• A minimum of 20 stable intra occlusal contacts after planned restoration
• In need of single standing implants replacing missing / extracted / avulsed teeth in the maxilla within zone 15 to 25

Exclusion Criteria:

• Untreated rampant caries and uncontrolled periodontal disease
• Use of smoking tobacco at time of inclusion
• History of pre-surgical bone augmentation, within 4 months, in the planned implant area
• History of extraction without augmentation, within 3 months in the planned implant area
• Absence of opposing dentition
• Absence of adjacent (mesial and/or distal) natural tooth
• Uncontrolled diabetes
• Known pregnancy at time of inclusion
• Present alcohol or drug abuse
• Any 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
• Unable or unwilling to return for follow-up visits for a period of 5 years
• Unrealistic esthetical demands
• Unlikely to be able to comply with study procedures according to Investigators judgment
• Already included in this study