Study on OsseoSpeed™ Implants in Patients Missing 2-5 Teeth in the Posterior Lower Jaw, Restored With Permanent Teeth Attached 6-7 Weeks Later

An Open, Prospective Study to Evaluate Implant Stability, Marginal Bone Adaptation and the Survival Rate of Astra Tech Dental Implant System, Fixture Osseospeed™, in Patients With Tooth Loss in the Posterior Mandible in an Early Loading Protocol.

The purpose of the study is to evaluate Astra Tech Dental Implant System, Fixture Osseospeed™, in patients with tooth loss in the posterior mandible in an early loading protocol. Primary objectives are implant stability, marginal bone adaptation and survival rate.

Inclusion Criteria:

• Provision of written informed consent
• 18 years of age and over
• Edentulous in the posterior mandible, Kennedy class I or class II. Last natural tooth, or previously restored implant in function is canine or first bicuspid.
• Deemed by the investigator as likely to present an initially stabile implant situation suitable for early loading

Exclusion Criteria:

• Untreated caries and/or periodontal disease of residual dentition
• History of edentulism in the area of implant placement of less than two months
• Current need for pre-surgical bone or soft tissue augmentation in the planned implant area.
• History of pre-surgical bone or soft tissue augmentation, within12 months, in the planned implant area.
• 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
• Present alcohol or drug abuse
• Unable or unwilling to return for follow-up visits for a period of 5 years
• Current use of smoking tobacco
• Pregnancy or lactation at the time of enrollment