The purpose of the study is to evaluate Astra Tech Dental Implant System, Fixture Osseospeed™, in patients with tooth loss in the posterior maxilla in an early loading protocol. Primary objectives are implant stability, marginal bone adaptation and survival rate.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
47
OsseoSpeed™, all dimensions
University of Iowa, College of Dentistry, Dow's Institute for Dental Research
Iowa City, Iowa, United States
UTHSCSA
San Antonio, Texas, United States
Universitetsklinik Mainz, Klinik fur ZMK
Mainz, Germany
Implant Survival Rate
An implant that has failed to osseointegrate, lost its osseointegration or fractured was considered a failure effective from the date of removal. The survival rate for individual implants was analyzed at each visit. Cumulative implant survival rate was calculated using Kaplan-Meier life-table estimation and reported as percentage of survived implants.
Time frame: At 5 year follow-up
Implant Stability
Implant stability was evaluated using Resonance Frequency Analysis (RFA). The RFA value was automatically translated into an Implant Stability Quotient index (ISQ), which runs from 1 to 100. The ISQ value indicates the level of stability. Low values (\<60) indicate low stability, medium values (60-70) indicate medium stability and high values (\>70) indicate high stability.
Time frame: At 1 year follow-up
Marginal Bone Adaptation
Marginal bone adaptation was 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 were compared to values obtained Baseline (loading). Positive value indicates bone gain and negative value bone loss.
Time frame: At baseline (loading) and at 5 year follow-up
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