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

Not Applicable

Completed

Brief Summary: 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.

Recruitment & Eligibility

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

Arm && Interventions

Group	Intervention	Description
A	OsseoSpeed™	-

Primary Outcome Measures

Name	Time	Method
Implant Survival Rate	At 5 year follow-up	An implant that has failed to osseointegrate, lost its osseointegration or fractured will be considered a failure effective from the date of removal. The survival rate for individual implants will be analyzed at each visit. Cumulative implant survival rate will be calculated using Kaplan-Meier life-table estimation and reported as percentage of survived implants.
Implant Stability	At 1 year follow-up	Implant stability will be evaluated using Resonance Frequency Analysis (RFA). The RFA value is automatically translated into an Implant Stability Quotient index (ISQ), which runs from 1 to 100.
Marginal Bone Adaptation	At 5 year follow-up	Marginal bone adaptation will be expressed as the distance from the implant reference point to the most coronal bone-to-implant contact on the mesial and distal side of the implant. Bone adaptation in millimeters at follow-up visit will be compared to values obtained Baseline (loading). Positive value indicates bone gain and negative value bone loss.

Secondary Outcome Measures

Name	Time	Method

Locations (3): The Ohio State University, College of Dentistry
🇺🇸
Columbus, Ohio, United States
Georg-August-Universität, Göttingen, Abt. Mund-, Keifer-, und Gesicthschirurgie
🇩🇪
Göttingen, Germany
University of Washington, Dept. of Restorative Dentistry
🇺🇸
Seattle, Washington, United States