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These are the main implant systems that we have been using here in UCONN, Clinic of Periodontology
Branemark (The most documented)
3i(with rough and smooth surface in the same implant) 
ITI(Easy to place,easier to restore) 
Steri-oss(Good for anterior esthetics) 
American College
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Periodontology
American Academy of Implant Dentistry
Academy of Osseointegration