Study on ASTRA TECH Implant System, Short Implants (OsseoSpeed™) Compared to Standard Length Implants (OsseoSpeed™) With Bone Substitution

Inclusion Criteria:

- Provision of informed consent

- Aged 20-75 years at enrolment

- History of edentulism in the study area of at least four months

- In need for 1-4 implants in either side of the posterior maxilla (premolar and molar
region)

- Neighboring tooth/teeth to the planned implant/s must have natural root(s) or implant
supported restoration, with absence of pathology or excessive bone loss, as judged by
the investigator

- Presence of natural tooth/teeth, partial prosthesis and/or implants in the opposite
jaw in contact with the planned crown/s

- Deemed by the investigator to have a bone height between 5 and 7 mm and a bone width
of a minimum of 6 mm

- Deemed by the investigator as likely to present an initially stable implant situation

Exclusion Criteria:

- Unlikely to be able to comply with study procedures, as judged by the investigator

- Earlier bone graft procedures in the study area

- Uncontrolled pathologic processes in the oral cavity

- Known or suspected current malignancy

- History of radiation therapy in the head and neck region

- History of chemotherapy within 5 years prior to surgery

- Systemic or local disease or condition that could compromise post-operative healing
and/or osseointegration

- Uncontrolled diabetes mellitus

- Corticosteroids, iv bisphosphonates or any other medication that could influence
post-operative healing and/or osseointegration

- Smoking more than 10 cigarettes/day

- Bruxism

- Present alcohol and/or drug abuse

- Involvement in the planning and conduct of the study (applies to both Astra Tech staff
and staff at the study site)

- Previous enrolment in the present study

- Simultaneous participation in another clinical study