Study to Compare Marginal Bone Loss Around Implants From Two Dental Implant Systems.

An Open, Randomized Study to Compare Two Dental Implant Systems With Regard to Changes in Marginal Bone Level.

The purpose of this study is to compare marginal bone level changes between ASTRA TECH Implant System; Fixture ST and Biomet 3i; Osseotite® Implants. Subjects with partial edentulism in the posterior maxilla and/or mandible will be included and a one-stage surgical protocol will be used. Implants will be loaded within 15 weeks from installation. The subjects will be followed for 3 years.

Inclusion Criteria:

• Provision of written informed consent
• Age 18 - 75 years
• Partial edentulism, Kennedy class I or II, last natural tooth must be cuspid or first bicuspid
• Edentulous in the area/s if implant placement for more than 2 months

Exclusion Criteria:

• Untreated caries and/or periodontal disease of residual dentition
• Need for pre-surgical bone or soft tissue augmentation in the planned implant area/s.
• Absence of occlusal stability in centric occlusion
• Any systemic or local disease or condition that would compromise post-operative healing and/or osseointegration
• Systemic corticosteroids or any other medication that would compromise post-operative healing and/or osseointegration
• Pregnancy
• Present alcohol or drug abuse
• Tobacco smoking during the last 6 months
• Unable or unwilling to return for follow-up visits for a period of 3 years